1 | |
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2 | ! $Id$ |
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3 | |
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4 | MODULE filtreg_mod |
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5 | |
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6 | REAL, DIMENSION(:,:,:), ALLOCATABLE :: matriceun,matriceus,matricevn |
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7 | REAL, DIMENSION(:,:,:), ALLOCATABLE :: matricevs,matrinvn,matrinvs |
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8 | |
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9 | CONTAINS |
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10 | |
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11 | SUBROUTINE inifilr |
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12 | #ifdef CPP_PARA |
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13 | USE mod_filtre_fft, ONLY : use_filtre_fft,Init_filtre_fft |
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14 | USE mod_filtre_fft_loc, ONLY : Init_filtre_fft_loc=>Init_filtre_fft ! |
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15 | #endif |
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16 | USE serre_mod, ONLY: alphax |
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17 | USE logic_mod, ONLY: fxyhypb, ysinus |
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18 | USE comconst_mod, ONLY: maxlatfilter |
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19 | |
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20 | ! ... H. Upadhyaya, O.Sharma ... |
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21 | |
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22 | IMPLICIT NONE |
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23 | |
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24 | ! version 3 ..... |
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25 | |
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26 | ! Correction le 28/10/97 P. Le Van . |
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27 | ! ------------------------------------------------------------------- |
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28 | include "dimensions.h" |
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29 | include "paramet.h" |
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30 | ! ------------------------------------------------------------------- |
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31 | include "comgeom.h" |
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32 | include "coefils.h" |
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33 | |
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34 | REAL dlonu(iim),dlatu(jjm) |
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35 | REAL rlamda( iim ), eignvl( iim ) |
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36 | |
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37 | REAL lamdamax,pi,cof |
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38 | INTEGER i,j,modemax,imx,k,kf,ii |
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39 | REAL dymin,dxmin,colat0 |
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40 | REAL eignft(iim,iim), coff |
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41 | |
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42 | LOGICAL, SAVE :: first_call_inifilr = .TRUE. |
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43 | |
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44 | INTEGER ISMIN |
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45 | EXTERNAL ISMIN |
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46 | INTEGER iymin |
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47 | INTEGER ixmineq |
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48 | |
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49 | ! ------------------------------------------------------------ |
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50 | ! This routine computes the eigenfunctions of the laplacien |
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51 | ! on the stretched grid, and the filtering coefficients |
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52 | |
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53 | ! We designate: |
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54 | ! eignfn eigenfunctions of the discrete laplacien |
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55 | ! eigenvl eigenvalues |
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56 | ! jfiltn indexof the last scalar line filtered in NH |
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57 | ! jfilts index of the first line filtered in SH |
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58 | ! modfrst index of the mode from WHERE modes are filtered |
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59 | ! modemax maximum number of modes ( im ) |
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60 | ! coefil filtering coefficients ( lamda_max*COS(rlat)/lamda ) |
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61 | ! sdd SQRT( dx ) |
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62 | |
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63 | ! the modes are filtered from modfrst to modemax |
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64 | |
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65 | !----------------------------------------------------------- |
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66 | |
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67 | if ( iim == 1 ) return ! No filtre in 2D y-z |
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68 | |
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69 | pi = 2. * ASIN( 1. ) |
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70 | |
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71 | DO i = 1,iim |
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72 | dlonu(i) = xprimu( i ) |
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73 | ENDDO |
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74 | |
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75 | CALL inifgn(eignvl) |
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76 | |
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77 | PRINT *,'inifilr: EIGNVL ' |
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78 | PRINT 250,eignvl |
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79 | 250 FORMAT( 1x,5e14.6) |
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80 | |
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81 | ! compute eigenvalues and eigenfunctions |
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82 | |
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83 | |
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84 | !................................................................. |
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85 | |
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86 | ! compute the filtering coefficients for scalar lines and |
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87 | ! meridional wind v-lines |
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88 | |
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89 | ! we filter all those latitude lines WHERE coefil < 1 |
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90 | ! NO FILTERING AT POLES |
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91 | |
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92 | ! colat0 is to be used when alpha (stretching coefficient) |
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93 | ! is set equal to zero for the regular grid CASE |
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94 | |
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95 | ! ....... Calcul de colat0 ......... |
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96 | ! ..... colat0 = minimum de ( 0.5, min dy/ min dx ) ... |
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97 | |
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98 | |
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99 | DO j = 1,jjm |
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100 | dlatu( j ) = rlatu( j ) - rlatu( j+1 ) |
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101 | ENDDO |
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102 | |
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103 | dxmin = dlonu(1) |
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104 | DO i = 2, iim |
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105 | dxmin = MIN( dxmin,dlonu(i) ) |
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106 | ENDDO |
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107 | dymin = dlatu(1) |
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108 | DO j = 2, jjm |
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109 | dymin = MIN( dymin,dlatu(j) ) |
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110 | ENDDO |
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111 | |
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112 | ! For a regular grid, we want the filter to start at latitudes |
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113 | ! corresponding to lengths dx of the same size as dy (in terms |
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114 | ! of angles: dx=2*dy) => at colat0=0.5 (i.e. colatitude=30 degrees |
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115 | ! <=> latitude=60 degrees). |
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116 | ! Same idea for the zoomed grid: start filtering polewards as soon |
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117 | ! as length dx becomes of the same size as dy |
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118 | |
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119 | ! if maxlatfilter >0, prescribe the colat0 value from the .def files |
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120 | |
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121 | IF (maxlatfilter < 0.) THEN |
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122 | |
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123 | colat0 = MIN( 0.5, dymin/dxmin ) |
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124 | ! colat0 = 1. |
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125 | |
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126 | IF( .NOT.fxyhypb.AND.ysinus ) THEN |
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127 | colat0 = 0.6 |
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128 | ! ...... a revoir pour ysinus ! ....... |
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129 | alphax = 0. |
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130 | ENDIF |
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131 | |
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132 | ELSE |
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133 | |
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134 | colat0=(90.0-maxlatfilter)/180.0*pi |
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135 | |
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136 | ENDIF |
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137 | |
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138 | PRINT 50, colat0,alphax |
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139 | 50 FORMAT(/15x,' Inifilr colat0 alphax ',2e16.7) |
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140 | |
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141 | IF(alphax==1. ) THEN |
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142 | PRINT *,' Inifilr alphax doit etre < a 1. Corriger ' |
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143 | STOP |
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144 | ENDIF |
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145 | |
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146 | lamdamax = iim / ( pi * colat0 * ( 1. - alphax ) ) |
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147 | |
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148 | ! ... Correction le 28/10/97 ( P.Le Van ) .. |
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149 | |
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150 | DO i = 2,iim |
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151 | rlamda( i ) = lamdamax/ SQRT( ABS( eignvl(i) ) ) |
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152 | ENDDO |
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153 | |
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154 | DO j = 1,jjm |
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155 | DO i = 1,iim |
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156 | coefilu( i,j ) = 0.0 |
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157 | coefilv( i,j ) = 0.0 |
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158 | coefilu2( i,j ) = 0.0 |
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159 | coefilv2( i,j ) = 0.0 |
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160 | ENDDO |
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161 | ENDDO |
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162 | |
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163 | ! ... Determination de jfiltnu,jfiltnv,jfiltsu,jfiltsv .... |
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164 | ! ......................................................... |
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165 | |
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166 | modemax = iim |
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167 | |
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168 | !!!! imx = modemax - 4 * (modemax/iim) |
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169 | |
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170 | imx = iim |
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171 | |
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172 | PRINT *,'inifilr: TRUNCATION AT ',imx |
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173 | |
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174 | ! Ehouarn: set up some defaults |
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175 | jfiltnu=2 ! avoid north pole |
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176 | jfiltsu=jjm ! avoid south pole (which is at jjm+1) |
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177 | jfiltnv=1 ! NB: no poles on the V grid |
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178 | jfiltsv=jjm |
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179 | |
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180 | DO j = 2, jjm/2+1 |
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181 | cof = COS( rlatu(j) )/ colat0 |
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182 | IF ( cof < 1. ) THEN |
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183 | IF( rlamda(imx) * COS(rlatu(j) )<1. ) THEN |
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184 | jfiltnu= j |
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185 | ENDIF |
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186 | ENDIF |
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187 | |
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188 | cof = COS( rlatu(jjp1-j+1) )/ colat0 |
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189 | IF ( cof < 1. ) THEN |
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190 | IF( rlamda(imx) * COS(rlatu(jjp1-j+1) )<1. ) THEN |
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191 | jfiltsu= jjp1-j+1 |
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192 | ENDIF |
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193 | ENDIF |
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194 | ENDDO |
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195 | |
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196 | DO j = 1, jjm/2 |
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197 | cof = COS( rlatv(j) )/ colat0 |
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198 | IF ( cof < 1. ) THEN |
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199 | IF( rlamda(imx) * COS(rlatv(j) )<1. ) THEN |
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200 | jfiltnv= j |
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201 | ENDIF |
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202 | ENDIF |
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203 | |
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204 | cof = COS( rlatv(jjm-j+1) )/ colat0 |
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205 | IF ( cof < 1. ) THEN |
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206 | IF( rlamda(imx) * COS(rlatv(jjm-j+1) )<1. ) THEN |
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207 | jfiltsv= jjm-j+1 |
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208 | ENDIF |
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209 | ENDIF |
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210 | ENDDO |
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211 | |
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212 | IF( jfiltnu> jjm/2 +1 ) THEN |
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213 | PRINT *,' jfiltnu en dehors des valeurs acceptables ' ,jfiltnu |
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214 | STOP |
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215 | ENDIF |
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216 | |
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217 | IF( jfiltsu> jjm +1 ) THEN |
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218 | PRINT *,' jfiltsu en dehors des valeurs acceptables ' ,jfiltsu |
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219 | STOP |
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220 | ENDIF |
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221 | |
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222 | IF( jfiltnv> jjm/2 ) THEN |
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223 | PRINT *,' jfiltnv en dehors des valeurs acceptables ' ,jfiltnv |
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224 | STOP |
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225 | ENDIF |
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226 | |
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227 | IF( jfiltsv> jjm ) THEN |
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228 | PRINT *,' jfiltsv en dehors des valeurs acceptables ' ,jfiltsv |
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229 | STOP |
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230 | ENDIF |
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231 | |
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232 | PRINT *,'inifilr: jfiltnv jfiltsv jfiltnu jfiltsu ' , & |
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233 | jfiltnv,jfiltsv,jfiltnu,jfiltsu |
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234 | |
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235 | IF(first_call_inifilr) THEN |
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236 | ALLOCATE(matriceun(iim,iim,jfiltnu)) |
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237 | ALLOCATE(matriceus(iim,iim,jjm-jfiltsu+1)) |
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238 | ALLOCATE(matricevn(iim,iim,jfiltnv)) |
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239 | ALLOCATE(matricevs(iim,iim,jjm-jfiltsv+1)) |
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240 | ALLOCATE( matrinvn(iim,iim,jfiltnu)) |
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241 | ALLOCATE( matrinvs(iim,iim,jjm-jfiltsu+1)) |
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242 | first_call_inifilr = .FALSE. |
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243 | ENDIF |
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244 | |
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245 | ! ... Determination de coefilu,coefilv,n=modfrstu,modfrstv .... |
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246 | !................................................................ |
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247 | |
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248 | |
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249 | DO j = 1,jjm |
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250 | !default initialization: all modes are retained (i.e. no filtering) |
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251 | modfrstu( j ) = iim |
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252 | modfrstv( j ) = iim |
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253 | ENDDO |
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254 | |
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255 | DO j = 2,jfiltnu |
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256 | DO k = 2,modemax |
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257 | cof = rlamda(k) * COS( rlatu(j) ) |
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258 | IF ( cof < 1. ) GOTO 82 |
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259 | ENDDO |
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260 | GOTO 84 |
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261 | 82 modfrstu( j ) = k |
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262 | |
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263 | kf = modfrstu( j ) |
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264 | DO k = kf , modemax |
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265 | cof = rlamda(k) * COS( rlatu(j) ) |
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266 | coefilu(k,j) = cof - 1. |
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267 | coefilu2(k,j) = cof*cof - 1. |
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268 | ENDDO |
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269 | 84 CONTINUE |
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270 | ENDDO |
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271 | |
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272 | |
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273 | DO j = 1,jfiltnv |
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274 | |
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275 | DO k = 2,modemax |
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276 | cof = rlamda(k) * COS( rlatv(j) ) |
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277 | IF ( cof < 1. ) GOTO 87 |
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278 | ENDDO |
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279 | GOTO 89 |
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280 | 87 modfrstv( j ) = k |
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281 | |
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282 | kf = modfrstv( j ) |
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283 | DO k = kf , modemax |
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284 | cof = rlamda(k) * COS( rlatv(j) ) |
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285 | coefilv(k,j) = cof - 1. |
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286 | coefilv2(k,j) = cof*cof - 1. |
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287 | ENDDO |
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288 | 89 CONTINUE |
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289 | ENDDO |
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290 | |
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291 | DO j = jfiltsu,jjm |
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292 | DO k = 2,modemax |
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293 | cof = rlamda(k) * COS( rlatu(j) ) |
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294 | IF ( cof < 1. ) GOTO 92 |
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295 | ENDDO |
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296 | GOTO 94 |
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297 | 92 modfrstu( j ) = k |
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298 | |
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299 | kf = modfrstu( j ) |
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300 | DO k = kf , modemax |
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301 | cof = rlamda(k) * COS( rlatu(j) ) |
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302 | coefilu(k,j) = cof - 1. |
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303 | coefilu2(k,j) = cof*cof - 1. |
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304 | ENDDO |
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305 | 94 CONTINUE |
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306 | ENDDO |
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307 | |
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308 | DO j = jfiltsv,jjm |
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309 | DO k = 2,modemax |
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310 | cof = rlamda(k) * COS( rlatv(j) ) |
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311 | IF ( cof < 1. ) GOTO 97 |
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312 | ENDDO |
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313 | GOTO 99 |
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314 | 97 modfrstv( j ) = k |
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315 | |
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316 | kf = modfrstv( j ) |
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317 | DO k = kf , modemax |
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318 | cof = rlamda(k) * COS( rlatv(j) ) |
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319 | coefilv(k,j) = cof - 1. |
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320 | coefilv2(k,j) = cof*cof - 1. |
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321 | ENDDO |
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322 | 99 CONTINUE |
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323 | ENDDO |
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324 | |
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325 | IF(jfiltnv>=jjm/2 .OR. jfiltnu>=jjm/2)THEN |
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326 | ! Ehouarn: and what are these for??? Trying to handle a limit case |
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327 | ! where filters extend to and meet at the equator? |
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328 | IF(jfiltnv==jfiltsv)jfiltsv=1+jfiltnv |
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329 | IF(jfiltnu==jfiltsu)jfiltsu=1+jfiltnu |
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330 | |
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331 | PRINT *,'jfiltnv jfiltsv jfiltnu jfiltsu' , & |
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332 | jfiltnv,jfiltsv,jfiltnu,jfiltsu |
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333 | ENDIF |
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334 | |
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335 | PRINT *,' Modes premiers v ' |
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336 | PRINT 334,modfrstv |
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337 | PRINT *,' Modes premiers u ' |
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338 | PRINT 334,modfrstu |
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339 | |
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340 | ! ................................................................... |
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341 | |
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342 | ! ... Calcul de la matrice filtre 'matriceu' pour les champs situes |
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343 | ! sur la grille scalaire ........ |
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344 | ! ................................................................... |
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345 | |
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346 | DO j = 2, jfiltnu |
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347 | |
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348 | DO i=1,iim |
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349 | coff = coefilu(i,j) |
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350 | IF( i<modfrstu(j) ) coff = 0. |
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351 | DO k=1,iim |
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352 | eignft(i,k) = eignfnv(k,i) * coff |
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353 | ENDDO |
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354 | ENDDO ! of DO i=1,iim |
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355 | |
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356 | #ifdef BLAS |
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357 | CALL SGEMM ('N', 'N', iim, iim, iim, 1.0, & |
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358 | eignfnv, iim, eignft, iim, 0.0, matriceun(1,1,j), iim) |
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359 | #else |
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360 | DO k = 1, iim |
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361 | DO i = 1, iim |
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362 | matriceun(i,k,j) = 0.0 |
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363 | DO ii = 1, iim |
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364 | matriceun(i,k,j) = matriceun(i,k,j) & |
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365 | + eignfnv(i,ii)*eignft(ii,k) |
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366 | ENDDO |
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367 | ENDDO |
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368 | ENDDO ! of DO k = 1, iim |
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369 | #endif |
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370 | |
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371 | ENDDO ! of DO j = 2, jfiltnu |
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372 | |
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373 | DO j = jfiltsu, jjm |
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374 | |
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375 | DO i=1,iim |
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376 | coff = coefilu(i,j) |
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377 | IF( i<modfrstu(j) ) coff = 0. |
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378 | DO k=1,iim |
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379 | eignft(i,k) = eignfnv(k,i) * coff |
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380 | ENDDO |
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381 | ENDDO ! of DO i=1,iim |
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382 | #ifdef BLAS |
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383 | CALL SGEMM ('N', 'N', iim, iim, iim, 1.0, & |
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384 | eignfnv, iim, eignft, iim, 0.0, & |
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385 | matriceus(1,1,j-jfiltsu+1), iim) |
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386 | #else |
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387 | DO k = 1, iim |
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388 | DO i = 1, iim |
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389 | matriceus(i,k,j-jfiltsu+1) = 0.0 |
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390 | DO ii = 1, iim |
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391 | matriceus(i,k,j-jfiltsu+1) = matriceus(i,k,j-jfiltsu+1) & |
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392 | + eignfnv(i,ii)*eignft(ii,k) |
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393 | ENDDO |
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394 | ENDDO |
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395 | ENDDO ! of DO k = 1, iim |
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396 | #endif |
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397 | |
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398 | ENDDO ! of DO j = jfiltsu, jjm |
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399 | |
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400 | ! ................................................................... |
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401 | |
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402 | ! ... Calcul de la matrice filtre 'matricev' pour les champs situes |
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403 | ! sur la grille de V ou de Z ........ |
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404 | ! ................................................................... |
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405 | |
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406 | DO j = 1, jfiltnv |
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407 | |
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408 | DO i = 1, iim |
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409 | coff = coefilv(i,j) |
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410 | IF( i<modfrstv(j) ) coff = 0. |
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411 | DO k = 1, iim |
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412 | eignft(i,k) = eignfnu(k,i) * coff |
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413 | ENDDO |
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414 | ENDDO |
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415 | |
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416 | #ifdef BLAS |
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417 | CALL SGEMM ('N', 'N', iim, iim, iim, 1.0, & |
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418 | eignfnu, iim, eignft, iim, 0.0, matricevn(1,1,j), iim) |
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419 | #else |
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420 | DO k = 1, iim |
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421 | DO i = 1, iim |
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422 | matricevn(i,k,j) = 0.0 |
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423 | DO ii = 1, iim |
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424 | matricevn(i,k,j) = matricevn(i,k,j) & |
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425 | + eignfnu(i,ii)*eignft(ii,k) |
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426 | ENDDO |
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427 | ENDDO |
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428 | ENDDO |
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429 | #endif |
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430 | |
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431 | ENDDO ! of DO j = 1, jfiltnv |
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432 | |
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433 | DO j = jfiltsv, jjm |
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434 | |
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435 | DO i = 1, iim |
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436 | coff = coefilv(i,j) |
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437 | IF( i<modfrstv(j) ) coff = 0. |
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438 | DO k = 1, iim |
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439 | eignft(i,k) = eignfnu(k,i) * coff |
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440 | ENDDO |
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441 | ENDDO |
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442 | |
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443 | #ifdef BLAS |
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444 | CALL SGEMM ('N', 'N', iim, iim, iim, 1.0, & |
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445 | eignfnu, iim, eignft, iim, 0.0, & |
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446 | matricevs(1,1,j-jfiltsv+1), iim) |
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447 | #else |
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448 | DO k = 1, iim |
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449 | DO i = 1, iim |
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450 | matricevs(i,k,j-jfiltsv+1) = 0.0 |
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451 | DO ii = 1, iim |
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452 | matricevs(i,k,j-jfiltsv+1) = matricevs(i,k,j-jfiltsv+1) & |
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453 | + eignfnu(i,ii)*eignft(ii,k) |
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454 | ENDDO |
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455 | ENDDO |
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456 | ENDDO |
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457 | #endif |
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458 | |
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459 | ENDDO ! of DO j = jfiltsv, jjm |
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460 | |
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461 | ! ................................................................... |
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462 | |
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463 | ! ... Calcul de la matrice filtre 'matrinv' pour les champs situes |
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464 | ! sur la grille scalaire , pour le filtre inverse ........ |
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465 | ! ................................................................... |
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466 | |
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467 | DO j = 2, jfiltnu |
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468 | |
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469 | DO i = 1,iim |
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470 | coff = coefilu(i,j)/ ( 1. + coefilu(i,j) ) |
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471 | IF( i<modfrstu(j) ) coff = 0. |
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472 | DO k=1,iim |
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473 | eignft(i,k) = eignfnv(k,i) * coff |
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474 | ENDDO |
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475 | ENDDO |
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476 | |
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477 | #ifdef BLAS |
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478 | CALL SGEMM ('N', 'N', iim, iim, iim, 1.0, & |
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479 | eignfnv, iim, eignft, iim, 0.0, matrinvn(1,1,j), iim) |
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480 | #else |
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481 | DO k = 1, iim |
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482 | DO i = 1, iim |
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483 | matrinvn(i,k,j) = 0.0 |
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484 | DO ii = 1, iim |
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485 | matrinvn(i,k,j) = matrinvn(i,k,j) & |
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486 | + eignfnv(i,ii)*eignft(ii,k) |
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487 | ENDDO |
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488 | ENDDO |
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489 | ENDDO |
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490 | #endif |
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491 | |
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492 | ENDDO ! of DO j = 2, jfiltnu |
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493 | |
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494 | DO j = jfiltsu, jjm |
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495 | |
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496 | DO i = 1,iim |
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497 | coff = coefilu(i,j) / ( 1. + coefilu(i,j) ) |
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498 | IF( i<modfrstu(j) ) coff = 0. |
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499 | DO k=1,iim |
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500 | eignft(i,k) = eignfnv(k,i) * coff |
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501 | ENDDO |
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502 | ENDDO |
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503 | #ifdef BLAS |
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504 | CALL SGEMM ('N', 'N', iim, iim, iim, 1.0, & |
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505 | eignfnv, iim, eignft, iim, 0.0, matrinvs(1,1,j-jfiltsu+1), iim) |
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506 | #else |
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507 | DO k = 1, iim |
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508 | DO i = 1, iim |
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509 | matrinvs(i,k,j-jfiltsu+1) = 0.0 |
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510 | DO ii = 1, iim |
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511 | matrinvs(i,k,j-jfiltsu+1) = matrinvs(i,k,j-jfiltsu+1) & |
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512 | + eignfnv(i,ii)*eignft(ii,k) |
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513 | ENDDO |
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514 | ENDDO |
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515 | ENDDO |
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516 | #endif |
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517 | |
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518 | ENDDO ! of DO j = jfiltsu, jjm |
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519 | |
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520 | #ifdef CPP_PARA |
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521 | IF (use_filtre_fft) THEN |
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522 | CALL Init_filtre_fft(coefilu,modfrstu,jfiltnu,jfiltsu, & |
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523 | coefilv,modfrstv,jfiltnv,jfiltsv) |
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524 | CALL Init_filtre_fft_loc(coefilu,modfrstu,jfiltnu,jfiltsu, & |
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525 | coefilv,modfrstv,jfiltnv,jfiltsv) |
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526 | ENDIF |
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527 | #endif |
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528 | ! ................................................................... |
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529 | |
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530 | 334 FORMAT(1x,24i3) |
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531 | |
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532 | END SUBROUTINE inifilr |
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533 | |
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534 | END MODULE filtreg_mod |
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