1 |
guez |
54 |
module fonte_neige_m |
2 |
|
|
|
3 |
|
|
implicit none |
4 |
|
|
|
5 |
|
|
contains |
6 |
|
|
|
7 |
guez |
104 |
SUBROUTINE fonte_neige(nisurf, dtime, tsurf, p1lay, beta, coef1lay, ps, & |
8 |
|
|
precip_rain, precip_snow, snow, qsol, t1lay, q1lay, u1lay, v1lay, & |
9 |
|
|
petAcoef, peqAcoef, petBcoef, peqBcoef, tsurf_new, evap, fqcalving, & |
10 |
|
|
ffonte, run_off_lic_0) |
11 |
guez |
54 |
|
12 |
|
|
! Routine de traitement de la fonte de la neige dans le cas du traitement |
13 |
guez |
178 |
! de sol simplifi\'e |
14 |
guez |
54 |
|
15 |
guez |
202 |
! Laurent Fairhead, March, 2001 |
16 |
guez |
101 |
|
17 |
guez |
178 |
USE fcttre, ONLY: foeew, qsatl, qsats, thermcep |
18 |
guez |
101 |
USE indicesol, ONLY: epsfra, is_lic, is_sic, is_ter |
19 |
guez |
202 |
USE interface_surf, ONLY: run_off_lic, tau_calv |
20 |
guez |
104 |
use nr_util, only: assert_eq |
21 |
guez |
178 |
USE suphec_m, ONLY: rcpd, rday, retv, rlmlt, rlstt, rlvtt, rtt |
22 |
guez |
101 |
USE yoethf_m, ONLY: r2es, r5ies, r5les, rvtmp2 |
23 |
|
|
|
24 |
guez |
178 |
integer, intent(IN):: nisurf ! surface \`a traiter |
25 |
guez |
101 |
real, intent(IN):: dtime ! pas de temps de la physique (en s) |
26 |
guez |
202 |
real, intent(IN):: tsurf(:) ! (knon) temperature de surface |
27 |
|
|
real, intent(IN):: p1lay(:) ! (knon) pression 1er niveau (milieu de couche) |
28 |
|
|
real, intent(IN):: beta(:) ! (knon) evap reelle |
29 |
|
|
real, intent(IN):: coef1lay(:) ! (knon) coefficient d'echange |
30 |
|
|
real, intent(IN):: ps(:) ! (knon) pression au sol |
31 |
guez |
101 |
|
32 |
|
|
real, intent(IN):: precip_rain(:) ! (knon) |
33 |
|
|
! precipitation, liquid water mass flux (kg/m2/s), positive down |
34 |
|
|
|
35 |
guez |
104 |
real, intent(IN):: precip_snow(:) ! (knon) |
36 |
guez |
101 |
! precipitation, solid water mass flux (kg/m2/s), positive down |
37 |
|
|
|
38 |
guez |
104 |
real, intent(INOUT):: snow(:) ! (knon) |
39 |
|
|
! column-density of mass of snow, in kg m-2 |
40 |
guez |
101 |
|
41 |
|
|
real, intent(INOUT):: qsol(:) ! (knon) |
42 |
|
|
! column-density of water in soil, in kg m-2 |
43 |
|
|
|
44 |
guez |
202 |
real, intent(IN):: t1lay(:) ! (knon) |
45 |
|
|
real, intent(IN):: q1lay(:) ! (knon) |
46 |
|
|
real, intent(IN):: u1lay(:), v1lay(:) ! (knon) |
47 |
guez |
54 |
|
48 |
guez |
202 |
real, intent(IN):: petAcoef(:), peqAcoef(:) ! (knon) |
49 |
|
|
! coefficients A de la r\'esolution de la couche limite pour t et q |
50 |
|
|
|
51 |
|
|
real, intent(IN):: petBcoef(:), peqBcoef(:) ! (knon) |
52 |
|
|
! coefficients B de la r\'esolution de la couche limite pour t et q |
53 |
|
|
|
54 |
guez |
104 |
real, intent(INOUT):: tsurf_new(:) |
55 |
guez |
54 |
! tsurf_new temperature au sol |
56 |
|
|
|
57 |
guez |
104 |
real, intent(IN):: evap(:) ! (knon) |
58 |
|
|
|
59 |
guez |
202 |
real, intent(OUT):: fqcalving(:) ! (knon) |
60 |
|
|
! flux d'eau "perdue" par la surface et n\'ecessaire pour limiter la |
61 |
guez |
101 |
! hauteur de neige, en kg/m2/s |
62 |
guez |
54 |
|
63 |
guez |
104 |
real, intent(OUT):: ffonte(:) ! (knon) |
64 |
guez |
202 |
! flux thermique utilis\'é pour fondre la neige |
65 |
guez |
101 |
|
66 |
guez |
202 |
real, intent(INOUT):: run_off_lic_0(:) ! (knon) |
67 |
|
|
! run off glacier du pas de temps pr\'ecedent |
68 |
guez |
101 |
|
69 |
|
|
! Local: |
70 |
|
|
|
71 |
guez |
178 |
integer knon ! nombre de points \`a traiter |
72 |
guez |
101 |
real, parameter:: snow_max=3000. |
73 |
guez |
54 |
! Masse maximum de neige (kg/m2). Au dessus de ce seuil, la neige |
74 |
|
|
! en exces "s'ecoule" (calving) |
75 |
|
|
|
76 |
guez |
101 |
integer i |
77 |
guez |
103 |
logical zdelta |
78 |
guez |
178 |
real zcvm5, zx_qs, zcor |
79 |
guez |
101 |
real fq_fonte |
80 |
guez |
104 |
REAL bil_eau_s(size(ps)) ! in kg m-2 |
81 |
|
|
real snow_evap(size(ps)) ! in kg m-2 s-1 |
82 |
guez |
188 |
real, parameter:: t_coup = 273.15 |
83 |
guez |
101 |
REAL, parameter:: chasno = 3.334E5/(2.3867E6*0.15) |
84 |
|
|
REAL, parameter:: chaice = 3.334E5/(2.3867E6*0.15) |
85 |
|
|
real, parameter:: max_eau_sol = 150. ! in kg m-2 |
86 |
|
|
real coeff_rel |
87 |
guez |
54 |
|
88 |
guez |
101 |
!-------------------------------------------------------------------- |
89 |
guez |
54 |
|
90 |
guez |
104 |
knon = assert_eq((/size(tsurf), size(p1lay), size(beta), size(coef1lay), & |
91 |
|
|
size(ps), size(precip_rain), size(precip_snow), size(snow), & |
92 |
|
|
size(qsol), size(t1lay), size(q1lay), size(u1lay), size(v1lay), & |
93 |
|
|
size(petAcoef), size(peqAcoef), size(petBcoef), size(peqBcoef), & |
94 |
|
|
size(tsurf_new), size(evap), size(fqcalving), size(ffonte), & |
95 |
|
|
size(run_off_lic_0)/), "fonte_neige knon") |
96 |
|
|
|
97 |
guez |
54 |
! Initialisations |
98 |
|
|
coeff_rel = dtime/(tau_calv * rday) |
99 |
|
|
bil_eau_s = 0. |
100 |
|
|
DO i = 1, knon |
101 |
|
|
IF (thermcep) THEN |
102 |
guez |
103 |
zdelta= rtt >= tsurf(i) |
103 |
|
|
zcvm5 = merge(R5IES*RLSTT, R5LES*RLVTT, zdelta) |
104 |
guez |
101 |
zcvm5 = zcvm5 / RCPD / (1. + RVTMP2*q1lay(i)) |
105 |
guez |
54 |
zx_qs= r2es * FOEEW(tsurf(i), zdelta)/ps(i) |
106 |
|
|
zx_qs=MIN(0.5, zx_qs) |
107 |
|
|
zcor=1./(1.-retv*zx_qs) |
108 |
|
|
zx_qs=zx_qs*zcor |
109 |
|
|
ELSE |
110 |
guez |
101 |
IF (tsurf(i) < t_coup) THEN |
111 |
guez |
54 |
zx_qs = qsats(tsurf(i)) / ps(i) |
112 |
|
|
ELSE |
113 |
|
|
zx_qs = qsatl(tsurf(i)) / ps(i) |
114 |
|
|
ENDIF |
115 |
|
|
ENDIF |
116 |
|
|
ENDDO |
117 |
|
|
|
118 |
guez |
101 |
! Calcul de la temperature de surface |
119 |
guez |
54 |
|
120 |
guez |
101 |
WHERE (precip_snow > 0.) snow = snow + precip_snow * dtime |
121 |
|
|
|
122 |
|
|
WHERE (evap > 0.) |
123 |
guez |
104 |
snow_evap = MIN(snow / dtime, evap) |
124 |
guez |
54 |
snow = snow - snow_evap * dtime |
125 |
guez |
101 |
snow = MAX(0., snow) |
126 |
|
|
elsewhere |
127 |
|
|
snow_evap = 0. |
128 |
guez |
54 |
end where |
129 |
|
|
|
130 |
guez |
101 |
bil_eau_s = precip_rain * dtime - (evap(:knon) - snow_evap(:knon)) * dtime |
131 |
guez |
54 |
|
132 |
guez |
202 |
! Y a-t-il fonte de neige ? |
133 |
guez |
54 |
|
134 |
|
|
ffonte=0. |
135 |
|
|
do i = 1, knon |
136 |
guez |
101 |
if ((snow(i) > epsfra .OR. nisurf == is_sic & |
137 |
|
|
.OR. nisurf == is_lic) .AND. tsurf_new(i) >= RTT) then |
138 |
|
|
fq_fonte = MIN(MAX((tsurf_new(i)-RTT)/chasno, 0.), snow(i)) |
139 |
guez |
54 |
ffonte(i) = fq_fonte * RLMLT/dtime |
140 |
|
|
snow(i) = max(0., snow(i) - fq_fonte) |
141 |
|
|
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
142 |
|
|
tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno |
143 |
|
|
!IM cf JLD/ GKtest fonte aussi pour la glace |
144 |
guez |
101 |
IF (nisurf == is_sic .OR. nisurf == is_lic) THEN |
145 |
|
|
fq_fonte = MAX((tsurf_new(i)-RTT)/chaice, 0.) |
146 |
guez |
54 |
ffonte(i) = ffonte(i) + fq_fonte * RLMLT/dtime |
147 |
|
|
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
148 |
|
|
tsurf_new(i) = RTT |
149 |
|
|
ENDIF |
150 |
|
|
endif |
151 |
|
|
|
152 |
guez |
178 |
! S'il y a une hauteur trop importante de neige, elle s'\'ecoule |
153 |
guez |
54 |
fqcalving(i) = max(0., snow(i) - snow_max)/dtime |
154 |
|
|
snow(i)=min(snow(i), snow_max) |
155 |
|
|
|
156 |
|
|
IF (nisurf == is_ter) then |
157 |
|
|
qsol(i) = qsol(i) + bil_eau_s(i) |
158 |
|
|
qsol(i) = MIN(qsol(i), max_eau_sol) |
159 |
|
|
else if (nisurf == is_lic) then |
160 |
|
|
run_off_lic(i) = (coeff_rel * fqcalving(i)) + & |
161 |
|
|
(1. - coeff_rel) * run_off_lic_0(i) |
162 |
|
|
run_off_lic_0(i) = run_off_lic(i) |
163 |
|
|
run_off_lic(i) = run_off_lic(i) + bil_eau_s(i)/dtime |
164 |
|
|
endif |
165 |
|
|
enddo |
166 |
|
|
|
167 |
|
|
END SUBROUTINE fonte_neige |
168 |
|
|
|
169 |
|
|
end module fonte_neige_m |