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source: palm/trunk/SOURCE/prandtl_fluxes.f90 @ 1532

Last change on this file since 1532 was 1497, checked in by maronga, 10 years ago
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[1]	1	SUBROUTINE prandtl_fluxes
	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later version.
	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[484]	20	! Current revisions:
[1]	21	! -----------------
[1341]	22	!
[1497]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: prandtl_fluxes.f90 1497 2014-12-02 17:28:07Z hoffmann $
	27	!
[1497]	28	! 1496 2014-12-02 17:25:50Z maronga
	29	! Adapted for land surface model
	30	!
[1495]	31	! 1494 2014-11-21 17:14:03Z maronga
	32	! Bugfixes: qs is now calculated before calculation of Rif. Ccalculation of
	33	! buoyancy flux in Rif corrected (added missing humidity term), allow use of
	34	! topography for coupled runs (not tested)
	35	!
[1362]	36	! 1361 2014-04-16 15:17:48Z hoffmann
	37	! Bugfix: calculation of turbulent fluxes of rain water content (qrsws) and rain
	38	! drop concentration (nrsws) added
	39	!
[1341]	40	! 1340 2014-03-25 19:45:13Z kanani
	41	! REAL constants defined as wp-kind
	42	!
[1321]	43	! 1320 2014-03-20 08:40:49Z raasch
[1320]	44	! ONLY-attribute added to USE-statements,
	45	! kind-parameters added to all INTEGER and REAL declaration statements,
	46	! kinds are defined in new module kinds,
	47	! old module precision_kind is removed,
	48	! revision history before 2012 removed,
	49	! comment fields (!:) to be used for variable explanations added to
	50	! all variable declaration statements
[1]	51	!
[1277]	52	! 1276 2014-01-15 13:40:41Z heinze
	53	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
	54	!
[1258]	55	! 1257 2013-11-08 15:18:40Z raasch
	56	! openACC "kernels do" replaced by "kernels loop", "loop independent" added
	57	!
[1037]	58	! 1036 2012-10-22 13:43:42Z raasch
	59	! code put under GPL (PALM 3.9)
	60	!
[1017]	61	! 1015 2012-09-27 09:23:24Z raasch
	62	! OpenACC statements added
	63	!
[979]	64	! 978 2012-08-09 08:28:32Z fricke
	65	! roughness length for scalar quantities z0h added
	66	!
[1]	67	! Revision 1.1 1998/01/23 10:06:06 raasch
	68	! Initial revision
	69	!
	70	!
	71	! Description:
	72	! ------------
	73	! Diagnostic computation of vertical fluxes in the Prandtl layer from the
	74	! values of the variables at grid point k=1
	75	!------------------------------------------------------------------------------!
	76
[1320]	77	USE arrays_3d, &
[1361]	78	ONLY: e, nr, nrs, nrsws, pt, q, qr, qrs, qrsws, qs, qsws, rif, shf, &
	79	ts, u, us, usws, v, vpt, vsws, zu, zw, z0, z0h
[1]	80
[1320]	81	USE control_parameters, &
[1361]	82	ONLY: cloud_physics, constant_heatflux, constant_waterflux, &
	83	coupling_mode, g, humidity, ibc_e_b, icloud_scheme, kappa, &
	84	large_scale_forcing, lsf_surf, passive_scalar, precipitation, &
	85	pt_surface, q_surface, rif_max, rif_min, run_coupled, &
	86	surface_pressure
[1320]	87
	88	USE indices, &
	89	ONLY: nxl, nxlg, nxr, nxrg, nys, nysg, nyn, nyng, nzb_s_inner, &
	90	nzb_u_inner, nzb_v_inner
	91
	92	USE kinds
	93
[1496]	94	USE land_surface_model_mod, &
	95	ONLY: land_surface
	96
[1]	97	IMPLICIT NONE
	98
[1320]	99	INTEGER(iwp) :: i !:
	100	INTEGER(iwp) :: j !:
	101	INTEGER(iwp) :: k !:
[1]	102
[1320]	103	LOGICAL :: coupled_run !:
	104
	105	REAL(wp) :: a !:
	106	REAL(wp) :: b !:
	107	REAL(wp) :: e_q !:
	108	REAL(wp) :: rifm !:
	109	REAL(wp) :: uv_total !:
	110	REAL(wp) :: z_p !:
	111
[1015]	112	!
	113	!-- Data information for accelerators
[1361]	114	!$acc data present( e, nrsws, nzb_u_inner, nzb_v_inner, nzb_s_inner, pt ) &
	115	!$acc present( q, qs, qsws, qrsws, rif, shf, ts, u, us, usws, v ) &
	116	!$acc present( vpt, vsws, zu, zw, z0, z0h )
[667]	117	!
[1]	118	!-- Compute theta*
	119	IF ( constant_heatflux ) THEN
[1496]	120
[1]	121	!
	122	!-- For a given heat flux in the Prandtl layer:
	123	!-- for u* use the value from the previous time step
	124	!$OMP PARALLEL DO
[1257]	125	!$acc kernels loop
[667]	126	DO i = nxlg, nxrg
	127	DO j = nysg, nyng
[1340]	128	ts(j,i) = -shf(j,i) / ( us(j,i) + 1E-30_wp )
[1]	129	!
	130	!-- ts must be limited, because otherwise overflow may occur in case of
	131	!-- us=0 when computing rif further below
[1340]	132	IF ( ts(j,i) < -1.05E5_wp ) ts(j,i) = -1.0E5_wp
	133	IF ( ts(j,i) > 1.0E5_wp ) ts(j,i) = 1.0E5_wp
[1]	134	ENDDO
	135	ENDDO
	136
	137	ELSE
	138	!
	139	!-- For a given surface temperature:
[1496]	140	!-- (the Richardson number is still the one from the previous time step)
[1276]	141	IF ( large_scale_forcing .AND. lsf_surf ) THEN
[1496]	142	!$OMP PARALLEL DO
	143	!$acc kernels loop
	144	DO i = nxlg, nxrg
	145	DO j = nysg, nyng
	146	k = nzb_s_inner(j,i)
	147	pt(k,j,i) = pt_surface
	148	ENDDO
	149	ENDDO
[1276]	150	ENDIF
	151
[1]	152	!$OMP PARALLEL DO PRIVATE( a, b, k, z_p )
[1257]	153	!$acc kernels loop
[667]	154	DO i = nxlg, nxrg
	155	DO j = nysg, nyng
[1]	156
	157	k = nzb_s_inner(j,i)
	158	z_p = zu(k+1) - zw(k)
	159
[1340]	160	IF ( rif(j,i) >= 0.0_wp ) THEN
[1]	161	!
	162	!-- Stable stratification
[978]	163	ts(j,i) = kappa * ( pt(k+1,j,i) - pt(k,j,i) ) / ( &
	164	LOG( z_p / z0h(j,i) ) + &
[1340]	165	5.0_wp * rif(j,i) * ( z_p - z0h(j,i) ) / z_p &
[1]	166	)
	167	ELSE
	168	!
	169	!-- Unstable stratification
[1340]	170	a = SQRT( 1.0_wp - 16.0_wp * rif(j,i) )
	171	b = SQRT( 1.0_wp - 16.0_wp * rif(j,i) * z0h(j,i) / z_p )
[187]	172
[1494]	173	ts(j,i) = kappa * ( pt(k+1,j,i) - pt(k,j,i) ) / ( &
	174	LOG( z_p / z0h(j,i) ) - &
[1340]	175	2.0_wp * LOG( ( 1.0_wp + a ) / ( 1.0_wp + b ) ) )
[1]	176	ENDIF
	177
	178	ENDDO
	179	ENDDO
	180	ENDIF
	181
	182	!
[1494]	183	!-- If required compute q*
	184	IF ( humidity .OR. passive_scalar ) THEN
	185	IF ( constant_waterflux ) THEN
	186	!
	187	!-- For a given water flux in the Prandtl layer:
	188	!$OMP PARALLEL DO
	189	!$acc kernels loop
	190	DO i = nxlg, nxrg
	191	DO j = nysg, nyng
	192	qs(j,i) = -qsws(j,i) / ( us(j,i) + 1E-30_wp )
	193	ENDDO
	194	ENDDO
	195
	196	ELSE
	197	coupled_run = ( coupling_mode == 'atmosphere_to_ocean' .AND. run_coupled )
	198
	199	IF ( large_scale_forcing .AND. lsf_surf ) THEN
[1496]	200	!$OMP PARALLEL DO
	201	!$acc kernels loop
	202	DO i = nxlg, nxrg
	203	DO j = nysg, nyng
	204	k = nzb_s_inner(j,i)
	205	q(k,j,i) = q_surface
	206	ENDDO
	207	ENDDO
[1494]	208	ENDIF
	209
	210	!$OMP PARALLEL DO PRIVATE( a, b, k, z_p )
	211	!$acc kernels loop independent
	212	DO i = nxlg, nxrg
	213	!$acc loop independent
	214	DO j = nysg, nyng
	215
	216	k = nzb_s_inner(j,i)
	217	z_p = zu(k+1) - zw(k)
	218
	219	!
	220	!-- Assume saturation for atmosphere coupled to ocean (but not
	221	!-- in case of precursor runs)
	222	IF ( coupled_run ) THEN
	223	e_q = 6.1_wp * &
	224	EXP( 0.07_wp * ( MIN(pt(k,j,i),pt(k+1,j,i)) - 273.15_wp ) )
	225	q(k,j,i) = 0.622_wp * e_q / ( surface_pressure - e_q )
	226	ENDIF
	227	IF ( rif(j,i) >= 0.0_wp ) THEN
	228	!
	229	!-- Stable stratification
	230	qs(j,i) = kappa * ( q(k+1,j,i) - q(k,j,i) ) / ( &
	231	LOG( z_p / z0h(j,i) ) + &
	232	5.0_wp * rif(j,i) * ( z_p - z0h(j,i) ) / z_p &
	233	)
	234	ELSE
	235	!
	236	!-- Unstable stratification
	237	a = SQRT( 1.0_wp - 16.0_wp * rif(j,i) )
	238	b = SQRT( 1.0_wp - 16.0_wp * rif(j,i) * z0h(j,i) / z_p )
	239
	240	qs(j,i) = kappa * ( q(k+1,j,i) - q(k,j,i) ) / ( &
	241	LOG( z_p / z0h(j,i) ) - &
	242	2.0_wp * LOG( (1.0_wp + a ) / ( 1.0_wp + b ) ) )
	243	ENDIF
	244
	245	ENDDO
	246	ENDDO
	247	ENDIF
	248	ENDIF
	249
	250	!
[1]	251	!-- Compute z_p/L (corresponds to the Richardson-flux number)
[75]	252	IF ( .NOT. humidity ) THEN
[1]	253	!$OMP PARALLEL DO PRIVATE( k, z_p )
[1257]	254	!$acc kernels loop
[667]	255	DO i = nxlg, nxrg
	256	DO j = nysg, nyng
[1]	257	k = nzb_s_inner(j,i)
	258	z_p = zu(k+1) - zw(k)
	259	rif(j,i) = z_p * kappa * g * ts(j,i) / &
[1340]	260	( pt(k+1,j,i) * ( us(j,i)**2 + 1E-30_wp ) )
[1]	261	!
	262	!-- Limit the value range of the Richardson numbers.
	263	!-- This is necessary for very small velocities (u,v --> 0), because
	264	!-- the absolute value of rif can then become very large, which in
	265	!-- consequence would result in very large shear stresses and very
	266	!-- small momentum fluxes (both are generally unrealistic).
	267	IF ( rif(j,i) < rif_min ) rif(j,i) = rif_min
	268	IF ( rif(j,i) > rif_max ) rif(j,i) = rif_max
	269	ENDDO
	270	ENDDO
	271	ELSE
	272	!$OMP PARALLEL DO PRIVATE( k, z_p )
[1257]	273	!$acc kernels loop
[667]	274	DO i = nxlg, nxrg
	275	DO j = nysg, nyng
[1]	276	k = nzb_s_inner(j,i)
	277	z_p = zu(k+1) - zw(k)
[1494]	278	rif(j,i) = z_p * kappa * g * &
	279	( ts(j,i) + 0.61_wp * pt(k+1,j,i) * qs(j,i) + 0.61_wp &
	280	* q(k+1,j,i) * ts(j,i)) / &
[1340]	281	( vpt(k+1,j,i) * ( us(j,i)**2 + 1E-30_wp ) )
[1]	282	!
	283	!-- Limit the value range of the Richardson numbers.
	284	!-- This is necessary for very small velocities (u,v --> 0), because
	285	!-- the absolute value of rif can then become very large, which in
	286	!-- consequence would result in very large shear stresses and very
	287	!-- small momentum fluxes (both are generally unrealistic).
	288	IF ( rif(j,i) < rif_min ) rif(j,i) = rif_min
	289	IF ( rif(j,i) > rif_max ) rif(j,i) = rif_max
	290	ENDDO
	291	ENDDO
	292	ENDIF
	293
	294	!
	295	!-- Compute u* at the scalars' grid points
	296	!$OMP PARALLEL DO PRIVATE( a, b, k, uv_total, z_p )
[1257]	297	!$acc kernels loop
[1]	298	DO i = nxl, nxr
	299	DO j = nys, nyn
	300
	301	k = nzb_s_inner(j,i)
	302	z_p = zu(k+1) - zw(k)
	303
	304	!
[667]	305	!-- Compute the absolute value of the horizontal velocity
	306	!-- (relative to the surface)
[1494]	307	uv_total = SQRT( ( 0.5_wp * ( u(k+1,j,i) + u(k+1,j,i+1) &
	308	- u(k,j,i) - u(k,j,i+1) ) )**2 + &
	309	( 0.5_wp * ( v(k+1,j,i) + v(k+1,j+1,i) &
[1340]	310	- v(k,j,i) - v(k,j+1,i) ) )**2 )
[1]	311
[667]	312
[1340]	313	IF ( rif(j,i) >= 0.0_wp ) THEN
[1]	314	!
	315	!-- Stable stratification
[1494]	316	us(j,i) = kappa * uv_total / ( &
	317	LOG( z_p / z0(j,i) ) + &
	318	5.0_wp * rif(j,i) * ( z_p - z0(j,i) ) / z_p &
[1]	319	)
	320	ELSE
	321	!
	322	!-- Unstable stratification
[1340]	323	a = SQRT( SQRT( 1.0_wp - 16.0_wp * rif(j,i) ) )
	324	b = SQRT( SQRT( 1.0_wp - 16.0_wp * rif(j,i) / z_p * z0(j,i) ) )
[187]	325
[1494]	326	us(j,i) = kappa * uv_total / ( &
	327	LOG( z_p / z0(j,i) ) - &
	328	LOG( ( 1.0_wp + a )*2 ( 1.0_wp + a**2 ) / ( &
	329	( 1.0_wp + b )*2 ( 1.0_wp + b**2 ) ) ) + &
	330	2.0_wp * ( ATAN( a ) - ATAN( b ) ) &
[187]	331	)
[1]	332	ENDIF
	333	ENDDO
	334	ENDDO
	335
	336	!
[187]	337	!-- Values of us at ghost point locations are needed for the evaluation of usws
	338	!-- and vsws.
[1015]	339	!$acc update host( us )
[187]	340	CALL exchange_horiz_2d( us )
[1015]	341	!$acc update device( us )
	342
[187]	343	!
[1]	344	!-- Compute u'w' for the total model domain.
	345	!-- First compute the corresponding component of u* and square it.
	346	!$OMP PARALLEL DO PRIVATE( a, b, k, rifm, z_p )
[1257]	347	!$acc kernels loop
[1]	348	DO i = nxl, nxr
	349	DO j = nys, nyn
	350
	351	k = nzb_u_inner(j,i)
	352	z_p = zu(k+1) - zw(k)
	353
	354	!
	355	!-- Compute Richardson-flux number for this point
[1340]	356	rifm = 0.5_wp * ( rif(j,i-1) + rif(j,i) )
	357	IF ( rifm >= 0.0_wp ) THEN
[1]	358	!
	359	!-- Stable stratification
[1494]	360	usws(j,i) = kappa * ( u(k+1,j,i) - u(k,j,i) )/ ( &
	361	LOG( z_p / z0(j,i) ) + &
	362	5.0_wp * rifm * ( z_p - z0(j,i) ) / z_p &
[1340]	363	)
[1]	364	ELSE
	365	!
	366	!-- Unstable stratification
[1340]	367	a = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm ) )
	368	b = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm / z_p * z0(j,i) ) )
[187]	369
[1494]	370	usws(j,i) = kappa * ( u(k+1,j,i) - u(k,j,i) ) / ( &
	371	LOG( z_p / z0(j,i) ) - &
	372	LOG( (1.0_wp + a )*2 ( 1.0_wp + a**2 ) / ( &
	373	(1.0_wp + b )*2 ( 1.0_wp + b**2 ) ) ) + &
	374	2.0_wp * ( ATAN( a ) - ATAN( b ) ) &
[1]	375	)
	376	ENDIF
[1340]	377	usws(j,i) = -usws(j,i) * 0.5_wp * ( us(j,i-1) + us(j,i) )
[1]	378	ENDDO
	379	ENDDO
	380
	381	!
	382	!-- Compute v'w' for the total model domain.
	383	!-- First compute the corresponding component of u* and square it.
	384	!$OMP PARALLEL DO PRIVATE( a, b, k, rifm, z_p )
[1257]	385	!$acc kernels loop
[1]	386	DO i = nxl, nxr
	387	DO j = nys, nyn
	388
	389	k = nzb_v_inner(j,i)
	390	z_p = zu(k+1) - zw(k)
	391
	392	!
	393	!-- Compute Richardson-flux number for this point
[1340]	394	rifm = 0.5_wp * ( rif(j-1,i) + rif(j,i) )
	395	IF ( rifm >= 0.0_wp ) THEN
[1]	396	!
	397	!-- Stable stratification
[1494]	398	vsws(j,i) = kappa * ( v(k+1,j,i) - v(k,j,i) ) / ( &
	399	LOG( z_p / z0(j,i) ) + &
	400	5.0_wp * rifm * ( z_p - z0(j,i) ) / z_p &
[1340]	401	)
[1]	402	ELSE
	403	!
	404	!-- Unstable stratification
[1340]	405	a = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm ) )
	406	b = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm / z_p * z0(j,i) ) )
[187]	407
[1494]	408	vsws(j,i) = kappa * ( v(k+1,j,i) - v(k,j,i) ) / ( &
	409	LOG( z_p / z0(j,i) ) - &
	410	LOG( (1.0_wp + a )*2 ( 1.0_wp + a**2 ) / ( &
	411	(1.0_wp + b )*2 ( 1.0_wp + b**2 ) ) ) + &
	412	2.0_wp * ( ATAN( a ) - ATAN( b ) ) &
[1]	413	)
	414	ENDIF
[1340]	415	vsws(j,i) = -vsws(j,i) * 0.5_wp * ( us(j-1,i) + us(j,i) )
[1]	416	ENDDO
	417	ENDDO
	418
	419	!
[1494]	420	!-- If required compute qr* and nr*
	421	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. precipitation ) THEN
[1276]	422
[1494]	423	!$OMP PARALLEL DO PRIVATE( a, b, k, z_p )
	424	!$acc kernels loop independent
	425	DO i = nxlg, nxrg
	426	!$acc loop independent
	427	DO j = nysg, nyng
[1276]	428
[1494]	429	k = nzb_s_inner(j,i)
	430	z_p = zu(k+1) - zw(k)
[1]	431
[1494]	432	IF ( rif(j,i) >= 0.0 ) THEN
[108]	433	!
[1494]	434	!-- Stable stratification
	435	qrs(j,i) = kappa * ( qr(k+1,j,i) - qr(k,j,i) ) / ( &
	436	LOG( z_p / z0h(j,i) ) + &
	437	5.0 * rif(j,i) * ( z_p - z0h(j,i) ) / z_p )
	438	nrs(j,i) = kappa * ( nr(k+1,j,i) - nr(k,j,i) ) / ( &
	439	LOG( z_p / z0h(j,i) ) + &
	440	5.0 * rif(j,i) * ( z_p - z0h(j,i) ) / z_p )
[1]	441
[1494]	442	ELSE
[1361]	443	!
[1494]	444	!-- Unstable stratification
	445	a = SQRT( 1.0 - 16.0 * rif(j,i) )
	446	b = SQRT( 1.0 - 16.0 * rif(j,i) * z0h(j,i) / z_p )
[1361]	447
[1494]	448	qrs(j,i) = kappa * ( qr(k+1,j,i) - qr(k,j,i) ) / ( &
	449	LOG( z_p / z0h(j,i) ) - &
	450	2.0 * LOG( (1.0 + a ) / ( 1.0 + b ) ) )
	451	nrs(j,i) = kappa * ( nr(k+1,j,i) - nr(k,j,i) ) / ( &
	452	LOG( z_p / z0h(j,i) ) - &
	453	2.0 * LOG( (1.0 + a ) / ( 1.0 + b ) ) )
[1361]	454
[1494]	455	ENDIF
[1361]	456
	457	ENDDO
[1494]	458	ENDDO
[1361]	459
[1]	460	ENDIF
	461
	462	!
[187]	463	!-- Exchange the boundaries for the momentum fluxes (only for sake of
	464	!-- completeness)
[1015]	465	!$acc update host( usws, vsws )
[1]	466	CALL exchange_horiz_2d( usws )
	467	CALL exchange_horiz_2d( vsws )
[1015]	468	!$acc update device( usws, vsws )
	469	IF ( humidity .OR. passive_scalar ) THEN
	470	!$acc update host( qsws )
	471	CALL exchange_horiz_2d( qsws )
	472	!$acc update device( qsws )
[1361]	473	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
	474	precipitation ) THEN
	475	!$acc update host( qrsws, nrsws )
	476	CALL exchange_horiz_2d( qrsws )
	477	CALL exchange_horiz_2d( nrsws )
	478	!$acc update device( qrsws, nrsws )
	479	ENDIF
[1015]	480	ENDIF
[1]	481
	482	!
	483	!-- Compute the vertical kinematic heat flux
[1496]	484	IF ( .NOT. constant_heatflux .AND. .NOT. land_surface ) THEN
[1]	485	!$OMP PARALLEL DO
[1257]	486	!$acc kernels loop independent
[667]	487	DO i = nxlg, nxrg
[1257]	488	!$acc loop independent
[667]	489	DO j = nysg, nyng
[1]	490	shf(j,i) = -ts(j,i) * us(j,i)
	491	ENDDO
	492	ENDDO
	493	ENDIF
	494
	495	!
	496	!-- Compute the vertical water/scalar flux
[1496]	497	IF ( .NOT. constant_waterflux .AND. ( humidity .OR. passive_scalar ) &
	498	.AND. .NOT. land_surface ) THEN
[1]	499	!$OMP PARALLEL DO
[1257]	500	!$acc kernels loop independent
[667]	501	DO i = nxlg, nxrg
[1257]	502	!$acc loop independent
[667]	503	DO j = nysg, nyng
[1]	504	qsws(j,i) = -qs(j,i) * us(j,i)
	505	ENDDO
	506	ENDDO
	507	ENDIF
	508
	509	!
[1361]	510	!-- Compute (turbulent) fluxes of rain water content and rain drop concentartion
	511	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. precipitation ) THEN
	512	!$OMP PARALLEL DO
	513	!$acc kernels loop independent
	514	DO i = nxlg, nxrg
	515	!$acc loop independent
	516	DO j = nysg, nyng
	517	qrsws(j,i) = -qrs(j,i) * us(j,i)
	518	nrsws(j,i) = -nrs(j,i) * us(j,i)
	519	ENDDO
	520	ENDDO
	521	ENDIF
	522
	523	!
[1]	524	!-- Bottom boundary condition for the TKE
	525	IF ( ibc_e_b == 2 ) THEN
	526	!$OMP PARALLEL DO
[1257]	527	!$acc kernels loop independent
[667]	528	DO i = nxlg, nxrg
[1257]	529	!$acc loop independent
[667]	530	DO j = nysg, nyng
[1340]	531	e(nzb_s_inner(j,i)+1,j,i) = ( us(j,i) / 0.1_wp )**2
[1]	532	!
	533	!-- As a test: cm = 0.4
[1340]	534	! e(nzb_s_inner(j,i)+1,j,i) = ( us(j,i) / 0.4_wp )**2
[1]	535	e(nzb_s_inner(j,i),j,i) = e(nzb_s_inner(j,i)+1,j,i)
	536	ENDDO
	537	ENDDO
	538	ENDIF
	539
[1015]	540	!$acc end data
[1]	541
	542	END SUBROUTINE prandtl_fluxes

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