1 | SUBROUTINE init_slope |
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2 | |
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3 | !------------------------------------------------------------------------------! |
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4 | ! Current revisions: |
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5 | ! ----------------- |
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6 | ! |
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7 | ! |
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8 | ! Former revisions: |
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9 | ! ----------------- |
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10 | ! $Id: init_slope.f90 484 2010-02-05 07:36:54Z raasch $ |
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11 | ! RCS Log replace by Id keyword, revision history cleaned up |
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12 | ! |
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13 | ! Revision 1.5 2006/02/23 12:35:34 raasch |
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14 | ! nanz_2dh renamed ngp_2dh |
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15 | ! |
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16 | ! Revision 1.1 2000/04/27 07:06:24 raasch |
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17 | ! Initial revision |
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18 | ! |
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19 | ! |
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20 | ! Description: |
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21 | ! ------------ |
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22 | ! Initialization of the temperature field and other variables used in case |
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23 | ! of a sloping surface. |
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24 | ! Remember: when a sloping surface is used, only one constant temperature |
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25 | ! gradient is allowed! |
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26 | !------------------------------------------------------------------------------! |
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27 | |
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28 | USE arrays_3d |
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29 | USE constants |
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30 | USE grid_variables |
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31 | USE indices |
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32 | USE pegrid |
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33 | USE control_parameters |
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34 | |
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35 | IMPLICIT NONE |
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36 | |
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37 | INTEGER :: i, j, k |
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38 | REAL :: alpha, height, pt_value, radius |
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39 | REAL, DIMENSION(:), ALLOCATABLE :: pt_init_local |
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40 | |
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41 | ! |
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42 | !-- Calculate reference temperature field needed for computing buoyancy |
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43 | ALLOCATE( pt_slope_ref(nzb:nzt+1,nxl-1:nxr+1) ) |
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44 | |
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45 | DO i = nxl-1, nxr+1 |
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46 | DO k = nzb, nzt+1 |
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47 | |
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48 | ! |
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49 | !-- Compute height of grid-point relative to lower left corner of |
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50 | !-- the total domain. |
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51 | !-- First compute the distance between the actual grid point and the |
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52 | !-- lower left corner as well as the angle between the line connecting |
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53 | !-- these points and the bottom of the model. |
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54 | IF ( k /= nzb ) THEN |
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55 | radius = SQRT( ( i * dx )**2 + zu(k)**2 ) |
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56 | height = zu(k) |
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57 | ELSE |
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58 | radius = SQRT( ( i * dx )**2 ) |
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59 | height = 0.0 |
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60 | ENDIF |
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61 | IF ( radius /= 0.0 ) THEN |
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62 | alpha = ASIN( height / radius ) |
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63 | ELSE |
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64 | alpha = 0.0 |
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65 | ENDIF |
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66 | ! |
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67 | !-- Compute temperatures in the rotated coordinate system |
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68 | alpha = alpha + alpha_surface / 180.0 * pi |
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69 | pt_value = pt_surface + radius * SIN( alpha ) * & |
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70 | pt_vertical_gradient(1) / 100.0 |
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71 | pt_slope_ref(k,i) = pt_value |
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72 | ENDDO |
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73 | ENDDO |
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74 | |
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75 | ! |
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76 | !-- Temperature difference between left and right boundary of the total domain, |
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77 | !-- used for the cyclic boundary in x-direction |
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78 | pt_slope_offset = (nx+1) * dx * sin_alpha_surface * & |
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79 | pt_vertical_gradient(1) / 100.0 |
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80 | |
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81 | |
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82 | ! |
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83 | !-- Following action must only be executed for initial runs |
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84 | IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN |
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85 | ! |
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86 | !-- Set initial temperature equal to the reference temperature field |
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87 | DO j = nys-1, nyn+1 |
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88 | pt(:,j,:) = pt_slope_ref |
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89 | ENDDO |
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90 | |
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91 | ! |
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92 | !-- Recompute the mean initial temperature profile (mean along x-direction of |
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93 | !-- the rotated coordinate system) |
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94 | ALLOCATE( pt_init_local(nzb:nzt+1) ) |
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95 | pt_init_local = 0.0 |
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96 | DO i = nxl, nxr |
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97 | DO j = nys, nyn |
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98 | DO k = nzb, nzt+1 |
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99 | pt_init_local(k) = pt_init_local(k) + pt(k,j,i) |
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100 | ENDDO |
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101 | ENDDO |
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102 | ENDDO |
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103 | |
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104 | #if defined( __parallel ) |
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105 | CALL MPI_ALLREDUCE( pt_init_local, pt_init, nzt+2-nzb, MPI_REAL, & |
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106 | MPI_SUM, comm2d, ierr ) |
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107 | #else |
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108 | pt_init = pt_init_local |
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109 | #endif |
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110 | |
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111 | pt_init = pt_init / ngp_2dh(0) |
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112 | DEALLOCATE( pt_init_local ) |
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113 | |
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114 | ENDIF |
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115 | |
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116 | END SUBROUTINE init_slope |
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