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- Jul 23, 2024, 7:14:34 PM (8 weeks ago)
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LMDZ6/branches/Amaury_dev/libf/phylmd/inlandsis/sisvat_bsn.f90
r5104 r5105 1 2 3 SUBROUTINE SISVAT_BSn4 5 C +------------------------------------------------------------------------+6 C | MAR SISVAT_BSn 04-apr-2020 MAR |7 C | SubRoutine SISVAT_BSn treats Snow Erosion |8 C | (not deposition anymore since 2-jun 2018) |9 C | |10 C | SISVAT_bsn computes the snow erosion mass according to both the |11 C | theoretical maximum erosion amount computed in inlandsis and the |12 C | availability of snow (currently in the uppermost snow layer only) |13 C | |14 C +------------------------------------------------------------------------+15 16 17 18 19 C +--General Variables20 C + =================21 1 22 use VARphy23 use VAR_SV24 use VARdSV25 use VARxSV26 use VARySV27 28 29 IMPLICIT NONE30 2 31 C +--Local Variables 32 C + =============== 33 34 35 integer ikl ,isn 36 real h_mmWE ! Eroded Snow Layer Min Thickness 37 real dbsaux(knonv) ! Drift Amount (Dummy Variable) 38 real dzweqo,dzweqn,bsno_x ! Conversion variables for erosion 39 real dz_new,rho_new 40 real snofOK ! Threshd Snow Fall 41 real Fac ! Correction factor for erosion 42 real densif ! Densification rate if erosion 43 44 C +--DATA 45 C + ==== 46 47 data h_mmWE / 0.01e00 / ! Eroded Snow Layer Min Thickness 48 49 C +--EROSION 50 C + ======= 51 52 !DO isn = nsno,2,-1 53 DO ikl = 1,knonv 54 55 isn = isnoSV(ikl) 56 dzweqo = dzsnSV(ikl,isn) *ro__SV(ikl,isn) ! [kg/m2, mm w.e.] 57 58 bsno_x = min(0.,dbs_SV(ikl)) 59 c Fac = min(1.,max(1-(ro__SV(ikl,isn)/700.),0.)**2) 60 c Fac = min(1.,max(1-(qsnoSV(ikl)*1000/30.),0.)) 61 c bsno_x = bsno_x*Fac 62 63 dzweqn = dzweqo + bsno_x 64 dzweqn = max(dzweqn,h_mmWE) 65 dzweqn = min(dzweqn,dzweqo) 66 cXF 67 dbs_SV(ikl) = dbs_SV(ikl) +(dzweqo -dzweqn) 68 dbs_Er(ikl) = dbs_Er(ikl) +(dzweqo -dzweqn) 69 dzsnSV(ikl,isn) = dzweqn 70 . /max(epsi,ro__SV(ikl,isn)) 71 72 ! Densification of the uppermost snow layer if erosion: 73 if((dzweqo-dzweqn)>0 .and. 74 . dzsnSV(ikl,isn)>0 .and. 75 . ro__SV(ikl,max(1,isnoSV(ikl)))<roBdSV) then 76 77 !characteristic time scale for drifting snow compaction set to 24h 78 !linear densification rate [kg/m3/s] over 24h 79 densif = (450. - frsno) / (3600*24) 80 81 !Attenuation of compaction rate from 450 to 500 kg/m3 82 Fac = 1-((ro__SV(ikl,max(1,isnoSV(ikl))) 83 . -roBdSV)/(500.-roBdSV)) 84 Fac = max(0.,min(1.,Fac)) 85 86 if (ro__SV(ikl,max(1,isnoSV(ikl)))>roBdSV) then 87 densif=densif*Fac 88 endif 89 90 rho_new = min(roBdSV,ro__SV(ikl,isn)+densif*dt__SV) 91 dz_new = dzsnSV(ikl,isn)*ro__SV(ikl,isn)/rho_new 92 ro__SV(ikl,isn)=rho_new 93 dzsnSV(ikl,isn)=dz_new 94 endif 95 96 if(dzsnSV(ikl,isn)>0 .and.dzsnSV(ikl,isn)<0.0001)then 97 dbs_SV(ikl) = dbs_SV(ikl)+ dzsnSV(ikl,isn)*ro__SV(ikl,isn) 98 dbs_Er(ikl) = dbs_Er(ikl)+ dzsnSV(ikl,isn)*ro__SV(ikl,isn) 99 dzsnSV(ikl,isn) = 0 100 ro__SV(ikl,isn) = 0 101 isnoSV(ikl) = max(0,isnoSV(ikl) - 1) 102 endif 103 104 END DO 105 !END DO 106 107 return 108 END 3 SUBROUTINE SISVAT_BSn 4 5 ! +------------------------------------------------------------------------+ 6 ! | MAR SISVAT_BSn 04-apr-2020 MAR | 7 ! | SubRoutine SISVAT_BSn treats Snow Erosion | 8 ! | (not deposition anymore since 2-jun 2018) | 9 ! | | 10 ! | SISVAT_bsn computes the snow erosion mass according to both the | 11 ! | theoretical maximum erosion amount computed in inlandsis and the | 12 ! | availability of snow (currently in the uppermost snow layer only) | 13 ! | | 14 ! +------------------------------------------------------------------------+ 15 16 17 18 19 ! +--General Variables 20 ! + ================= 21 22 use VARphy 23 use VAR_SV 24 use VARdSV 25 use VARxSV 26 use VARySV 27 28 29 IMPLICIT NONE 30 31 ! +--Local Variables 32 ! + =============== 33 34 35 integer :: ikl ,isn 36 real :: h_mmWE ! Eroded Snow Layer Min Thickness 37 real :: dbsaux(knonv) ! Drift Amount (Dummy Variable) 38 real :: dzweqo,dzweqn,bsno_x ! Conversion variables for erosion 39 real :: dz_new,rho_new 40 real :: snofOK ! Threshd Snow Fall 41 real :: Fac ! Correction factor for erosion 42 real :: densif ! Densification rate if erosion 43 44 ! +--DATA 45 ! + ==== 46 47 data h_mmWE / 0.01e00 / ! Eroded Snow Layer Min Thickness 48 49 ! +--EROSION 50 ! + ======= 51 52 ! !DO isn = nsno,2,-1 53 DO ikl = 1,knonv 54 55 isn = isnoSV(ikl) 56 dzweqo = dzsnSV(ikl,isn) *ro__SV(ikl,isn) ! [kg/m2, mm w.e.] 57 58 bsno_x = min(0.,dbs_SV(ikl)) 59 ! Fac = min(1.,max(1-(ro__SV(ikl,isn)/700.),0.)**2) 60 ! Fac = min(1.,max(1-(qsnoSV(ikl)*1000/30.),0.)) 61 ! bsno_x = bsno_x*Fac 62 63 dzweqn = dzweqo + bsno_x 64 dzweqn = max(dzweqn,h_mmWE) 65 dzweqn = min(dzweqn,dzweqo) 66 !XF 67 dbs_SV(ikl) = dbs_SV(ikl) +(dzweqo -dzweqn) 68 dbs_Er(ikl) = dbs_Er(ikl) +(dzweqo -dzweqn) 69 dzsnSV(ikl,isn) = dzweqn & 70 /max(epsi,ro__SV(ikl,isn)) 71 72 ! ! Densification of the uppermost snow layer if erosion: 73 if((dzweqo-dzweqn)>0 .and. & 74 dzsnSV(ikl,isn)>0 .and. & 75 ro__SV(ikl,max(1,isnoSV(ikl)))<roBdSV) then 76 77 ! !characteristic time scale for drifting snow compaction set to 24h 78 ! !linear densification rate [kg/m3/s] over 24h 79 densif = (450. - frsno) / (3600*24) 80 81 ! !Attenuation of compaction rate from 450 to 500 kg/m3 82 Fac = 1-((ro__SV(ikl,max(1,isnoSV(ikl))) & 83 -roBdSV)/(500.-roBdSV)) 84 Fac = max(0.,min(1.,Fac)) 85 86 if (ro__SV(ikl,max(1,isnoSV(ikl)))>roBdSV) then 87 densif=densif*Fac 88 endif 89 90 rho_new = min(roBdSV,ro__SV(ikl,isn)+densif*dt__SV) 91 dz_new = dzsnSV(ikl,isn)*ro__SV(ikl,isn)/rho_new 92 ro__SV(ikl,isn)=rho_new 93 dzsnSV(ikl,isn)=dz_new 94 endif 95 96 if(dzsnSV(ikl,isn)>0 .and.dzsnSV(ikl,isn)<0.0001)then 97 dbs_SV(ikl) = dbs_SV(ikl)+ dzsnSV(ikl,isn)*ro__SV(ikl,isn) 98 dbs_Er(ikl) = dbs_Er(ikl)+ dzsnSV(ikl,isn)*ro__SV(ikl,isn) 99 dzsnSV(ikl,isn) = 0 100 ro__SV(ikl,isn) = 0 101 isnoSV(ikl) = max(0,isnoSV(ikl) - 1) 102 endif 103 104 END DO 105 ! !END DO 106 107 108 END SUBROUTINE SISVAT_BSn
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