/* ************************************************************************* */
int fill_array_2d(N_array_2d * a)
{
int rows, cols, type;
int i, j, res = 0;
rows = a->rows;
cols = a->cols;
type = N_get_array_2d_type(a);
#pragma omp parallel for private (i, j) shared (cols, rows, type, a) reduction(+:res)
for (j = 0; j < rows; j++) {
for (i = 0; i < cols; i++) {
if (type == CELL_TYPE) {
N_put_array_2d_c_value(a, i, j, (CELL) i * (CELL) j);
if (N_get_array_2d_c_value(a, i, j) != (CELL) i * (CELL) j)
res++;
}
if (type == FCELL_TYPE) {
N_put_array_2d_f_value(a, i, j, (FCELL) i * (FCELL) j);
if (N_get_array_2d_f_value(a, i, j) != (FCELL) i * (FCELL) j)
res++;
}
if (type == DCELL_TYPE) {
N_put_array_2d_d_value(a, i, j, (DCELL) i * (DCELL) j);
if (N_get_array_2d_d_value(a, i, j) != (DCELL) i * (DCELL) j)
res++;
}
}
}
return res;
}
/* ************************************************************************* */
void
copy_result(N_array_2d * status, N_array_2d * phead_start, double *result,
struct Cell_head *region, N_array_2d * target)
{
int y, x, rows, cols, count, stat;
double d1 = 0;
DCELL val;
rows = region->rows;
cols = region->cols;
count = 0;
for (y = 0; y < rows; y++) {
G_percent(y, rows - 1, 10);
for (x = 0; x < cols; x++) {
stat = N_get_array_2d_c_value(status, x, y);
if (stat == N_CELL_ACTIVE) { /*only active cells */
d1 = result[count];
val = (DCELL) d1;
count++;
}
else if (stat == N_CELL_DIRICHLET) { /*dirichlet cells */
d1 = N_get_array_2d_d_value(phead_start, x, y);
val = (DCELL) d1;
count++;
}
else {
G_set_null_value(&val, 1, DCELL_TYPE);
}
N_put_array_2d_d_value(target, x, y, val);
}
}
return;
}
/*!
* \brief Compute the transmission boundary condition in 2d
*
* This function calculates the transmission boundary condition
* for each cell with status N_CELL_TRANSMISSION. The surrounding
* gradient field is used to verfiy the flow direction. If a flow
* goes into a cell, the concentration (data->c) from the neighbour cell is
* added to the transmission cell. If the flow from several neighbour
* cells goes into the cell, the concentration mean is calculated.
*
* The new concentrations are written into the data->c_start array,
* so they can be handled by the matrix assembling function.
*
* \param data N_solute_transport_data2d *
* \return void *
* */
void N_calc_solute_transport_transmission_2d(N_solute_transport_data2d * data)
{
int i, j, count = 1;
int cols, rows;
double c;
N_gradient_2d grad;
cols = data->grad->cols;
rows = data->grad->rows;
G_debug(2,
"N_calc_solute_transport_transmission_2d: calculating transmission boundary");
for (j = 0; j < rows; j++) {
for (i = 0; i < cols; i++) {
if (N_get_array_2d_d_value(data->status, i, j) ==
N_CELL_TRANSMISSION) {
count = 0;
/*get the gradient neighbours */
N_get_gradient_2d(data->grad, &grad, i, j);
c = 0;
/*
c = N_get_array_2d_d_value(data->c_start, i, j);
if(c > 0)
count++;
*/
if (grad.WC > 0 &&
!N_is_array_2d_value_null(data->c, i - 1, j)) {
c += N_get_array_2d_d_value(data->c, i - 1, j);
count++;
}
if (grad.EC < 0 &&
!N_is_array_2d_value_null(data->c, i + 1, j)) {
c += N_get_array_2d_d_value(data->c, i + 1, j);
count++;
}
if (grad.NC < 0 &&
!N_is_array_2d_value_null(data->c, i, j - 1)) {
c += N_get_array_2d_d_value(data->c, i, j - 1);
count++;
}
if (grad.SC > 0 &&
!N_is_array_2d_value_null(data->c, i, j + 1)) {
c += N_get_array_2d_d_value(data->c, i, j + 1);
count++;
}
if (count != 0)
c = c / (double)count;
/*make sure it is not NAN */
if (c > 0 || c == 0 || c < 0)
N_put_array_2d_d_value(data->c_start, i, j, c);
}
}
}
return;
}
/*!
* \brief Compute the dispersivity tensor based on the solute transport data in 2d
*
* The dispersivity tensor is stored in the data structure.
* To compute the dispersivity tensor, the dispersivity lentghs and the gradient field
* must be present.
*
* This is just a simple tensor computation which should be extended.
*
* \todo Change the tensor calculation to a mor realistic algorithm
*
* \param data N_solute_transport_data2d *
* \return void *
* */
void N_calc_solute_transport_disptensor_2d(N_solute_transport_data2d * data)
{
int i, j;
int cols, rows;
double vx, vy, vv;
double disp_xx, disp_yy, disp_xy;
N_gradient_2d grad;
cols = data->grad->cols;
rows = data->grad->rows;
G_debug(2,
"N_calc_solute_transport_disptensor_2d: calculating the dispersivity tensor");
for (j = 0; j < rows; j++) {
for (i = 0; i < cols; i++) {
disp_xx = 0;
disp_yy = 0;
disp_xy = 0;
/*get the gradient neighbours */
N_get_gradient_2d(data->grad, &grad, i, j);
vx = (grad.WC + grad.EC) / 2;
vy = (grad.NC + grad.SC) / 2;
vv = sqrt(vx * vx + vy * vy);
if (vv != 0) {
disp_xx = data->al * vx * vx / vv + data->at * vy * vy / vv;
disp_yy = data->at * vx * vx / vv + data->al * vy * vy / vv;
disp_xy = (data->al - data->at) * vx * vy / vv;
}
G_debug(5,
"N_calc_solute_transport_disptensor_2d: [%i][%i] disp_xx %g disp_yy %g disp_xy %g",
i, j, disp_xx, disp_yy, disp_xy);
N_put_array_2d_d_value(data->disp_xx, i, j, disp_xx);
N_put_array_2d_d_value(data->disp_yy, i, j, disp_yy);
N_put_array_2d_d_value(data->disp_xy, i, j, disp_xy);
}
}
return;
}
/* *************************************************************** */
N_array_2d *create_value_array_2d(void)
{
N_array_2d *data;
int i, j;
data = N_alloc_array_2d(TEST_N_NUM_COLS, TEST_N_NUM_ROWS, 1, DCELL_TYPE);
#pragma omp parallel for private (i, j) shared (data)
for (j = 0; j < TEST_N_NUM_ROWS; j++) {
for (i = 0; i < TEST_N_NUM_COLS; i++) {
if (j == 1) {
N_put_array_2d_d_value(data, i, j, 50);
}
else {
N_put_array_2d_d_value(data, i, j, 1);
}
}
}
return data;
}
/* *************************************************************** */
int test_solute_transport_2d(void)
{
N_solute_transport_data2d *data = NULL;
N_geom_data *geom = NULL;
N_les *les = NULL;
N_les_callback_2d *call = NULL;
N_array_2d *pot, *relax = NULL;
N_gradient_field_2d *field = NULL;
int i, j;
/*set the callback */
call = N_alloc_les_callback_2d();
N_set_les_callback_2d_func(call, (*N_callback_solute_transport_2d));
pot =
N_alloc_array_2d(TEST_N_NUM_COLS_LOCAL, TEST_N_NUM_ROWS_LOCAL, 1,
DCELL_TYPE);
relax =
N_alloc_array_2d(TEST_N_NUM_COLS_LOCAL, TEST_N_NUM_ROWS_LOCAL, 1,
DCELL_TYPE);
data = create_solute_transport_data_2d();
data->dt = 600;
geom = N_alloc_geom_data();
geom->dx = 10;
geom->dy = 15;
geom->Az = 150;
geom->rows = TEST_N_NUM_ROWS_LOCAL;
geom->cols = TEST_N_NUM_COLS_LOCAL;
for (j = 0; j < TEST_N_NUM_ROWS_LOCAL; j++) {
for (i = 0; i < TEST_N_NUM_COLS_LOCAL; i++) {
N_put_array_2d_d_value(pot, i, j, j);
N_put_array_2d_d_value(relax, i, j, 1);
}
}
field = N_compute_gradient_field_2d(pot, relax, relax, geom, NULL);
N_copy_gradient_field_2d(field, data->grad);
N_free_gradient_field_2d(field);
N_compute_gradient_field_2d(pot, relax, relax, geom, data->grad);
/*The dispersivity tensor */
N_calc_solute_transport_disptensor_2d(data);
/*Assemble the matrix */
/*
*/
/*Jacobi */ les =
N_assemble_les_2d(N_SPARSE_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_jacobi(les, 100, 1, 0.1e-8);
N_print_les(les);
N_free_les(les);
/*jacobi */ les =
N_assemble_les_2d(N_NORMAL_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_jacobi(les, 100, 1, 0.1e-8);
N_print_les(les);
N_free_les(les);
/*SOR*/ les =
N_assemble_les_2d(N_SPARSE_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_SOR(les, 100, 1, 0.1e-8);
N_print_les(les);
N_free_les(les);
/*SOR*/ les =
N_assemble_les_2d(N_NORMAL_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_SOR(les, 100, 1, 0.1e-8);
N_print_les(les);
N_free_les(les);
/*BICG*/ les =
N_assemble_les_2d(N_SPARSE_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_bicgstab(les, 100, 0.1e-8);
N_print_les(les);
N_free_les(les);
/*BICG*/ les =
N_assemble_les_2d(N_NORMAL_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_bicgstab(les, 100, 0.1e-8);
N_print_les(les);
N_free_les(les);
/*GAUSS*/ les =
N_assemble_les_2d(N_NORMAL_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_gauss(les);
N_print_les(les);
N_free_les(les);
/*LU*/ les =
N_assemble_les_2d(N_NORMAL_LES, geom, data->status, data->c_start,
(void *)data, call);
N_solver_lu(les);
N_print_les(les);
N_free_les(les);
N_free_solute_transport_data2d(data);
G_free(geom);
G_free(call);
return 0;
}
/* *************************************************************** */
N_solute_transport_data2d *create_solute_transport_data_2d(void)
{
int i, j;
N_solute_transport_data2d *data;
data =
N_alloc_solute_transport_data2d(TEST_N_NUM_COLS_LOCAL,
TEST_N_NUM_ROWS_LOCAL);
#pragma omp parallel for private (i, j) shared (data)
for (j = 0; j < TEST_N_NUM_ROWS_LOCAL; j++) {
for (i = 0; i < TEST_N_NUM_COLS_LOCAL; i++) {
if (j == 0) {
N_put_array_2d_d_value(data->c, i, j, 0);
N_put_array_2d_d_value(data->c_start, i, j, 0);
N_put_array_2d_d_value(data->status, i, j, 2);
}
else {
N_put_array_2d_d_value(data->c, i, j, 0);
N_put_array_2d_d_value(data->c_start, i, j, 0);
N_put_array_2d_d_value(data->status, i, j, 1);
}
N_put_array_2d_d_value(data->diff_x, i, j, 0.000001);
N_put_array_2d_d_value(data->diff_y, i, j, 0.000001);
N_put_array_2d_d_value(data->cs, i, j, 0.0);
N_put_array_2d_d_value(data->R, i, j, 1.0);
N_put_array_2d_d_value(data->q, i, j, 0.0);
N_put_array_2d_d_value(data->nf, i, j, 0.1);
N_put_array_2d_d_value(data->top, i, j, 20.0);
N_put_array_2d_d_value(data->bottom, i, j, 0.0);
if (j == 1 && i == 1)
N_put_array_2d_d_value(data->cs, i, j, 1.0);
}
}
/*dispersivity length */
data->al = 0.2;
data->at = 0.02;
return data;
}
/* ************************************************************************* */
int main(int argc, char *argv[])
{
struct GModule *module = NULL;
N_solute_transport_data2d *data = NULL;
N_geom_data *geom = NULL;
N_les *les = NULL;
N_les_callback_2d *call = NULL;
struct Cell_head region;
double error, sor;
char *solver;
int x, y, stat, i, maxit = 1;
double loops = 1;
N_array_2d *xcomp = NULL;
N_array_2d *ycomp = NULL;
N_array_2d *hc_x = NULL;
N_array_2d *hc_y = NULL;
N_array_2d *phead = NULL;
double time_step, cfl, length, time_loops, time_sum;
/* Initialize GRASS */
G_gisinit(argv[0]);
module = G_define_module();
G_add_keyword(_("raster"));
G_add_keyword(_("hydrology"));
G_add_keyword(_("solute transport"));
module->description =
_("Numerical calculation program for transient, confined and unconfined "
"solute transport in two dimensions");
/* Get parameters from user */
set_params();
if (G_parser(argc, argv))
exit(EXIT_FAILURE);
/* Make sure that the current projection is not lat/long */
if ((G_projection() == PROJECTION_LL))
G_fatal_error(_("Lat/Long location is not supported by %s. Please reproject map first."),
G_program_name());
/*Set the maximum iterations */
sscanf(param.maxit->answer, "%i", &(maxit));
/*Set the calculation error break criteria */
sscanf(param.error->answer, "%lf", &(error));
sscanf(param.sor->answer, "%lf", &(sor));
/*number of loops*/
sscanf(param.loops->answer, "%lf", &(loops));
/*Set the solver */
solver = param.solver->answer;
if (strcmp(solver, G_MATH_SOLVER_DIRECT_LU) == 0 && !param.full_les->answer)
G_fatal_error(_("The direct LU solver do not work with sparse matrices"));
if (strcmp(solver, G_MATH_SOLVER_DIRECT_GAUSS) == 0 && !param.full_les->answer)
G_fatal_error(_("The direct Gauss solver do not work with sparse matrices"));
/*get the current region */
G_get_set_window(®ion);
/*allocate the geometry structure for geometry and area calculation */
geom = N_init_geom_data_2d(®ion, geom);
/*Set the function callback to the groundwater flow function */
call = N_alloc_les_callback_2d();
N_set_les_callback_2d_func(call, (*N_callback_solute_transport_2d)); /*solute_transport 2d */
/*Allocate the groundwater flow data structure */
data = N_alloc_solute_transport_data2d(geom->cols, geom->rows);
/*Set the stabilizing scheme*/
if (strncmp("full", param.stab->answer, 4) == 0) {
data->stab = N_UPWIND_FULL;
}
if (strncmp("exp", param.stab->answer, 3) == 0) {
data->stab = N_UPWIND_EXP;
}
/*the dispersivity lengths*/
sscanf(param.al->answer, "%lf", &(data->al));
sscanf(param.at->answer, "%lf", &(data->at));
/*Set the calculation time */
sscanf(param.dt->answer, "%lf", &(data->dt));
/*read all input maps into the memory and take care of the
* null values.*/
N_read_rast_to_array_2d(param.c->answer, data->c);
N_convert_array_2d_null_to_zero(data->c);
N_read_rast_to_array_2d(param.c->answer, data->c_start);
N_convert_array_2d_null_to_zero(data->c_start);
N_read_rast_to_array_2d(param.status->answer, data->status);
N_convert_array_2d_null_to_zero(data->status);
N_read_rast_to_array_2d(param.diff_x->answer, data->diff_x);
N_convert_array_2d_null_to_zero(data->diff_x);
N_read_rast_to_array_2d(param.diff_y->answer, data->diff_y);
N_convert_array_2d_null_to_zero(data->diff_y);
N_read_rast_to_array_2d(param.q->answer, data->q);
N_convert_array_2d_null_to_zero(data->q);
N_read_rast_to_array_2d(param.nf->answer, data->nf);
N_convert_array_2d_null_to_zero(data->nf);
N_read_rast_to_array_2d(param.cs->answer, data->cs);
N_convert_array_2d_null_to_zero(data->cs);
N_read_rast_to_array_2d(param.top->answer, data->top);
N_convert_array_2d_null_to_zero(data->top);
N_read_rast_to_array_2d(param.bottom->answer, data->bottom);
N_convert_array_2d_null_to_zero(data->bottom);
N_read_rast_to_array_2d(param.r->answer, data->R);
N_convert_array_2d_null_to_zero(data->R);
if(param.cin->answer) {
N_read_rast_to_array_2d(param.cin->answer, data->cin);
N_convert_array_2d_null_to_zero(data->cin);
}
/*initiate the values for velocity calculation*/
hc_x = N_alloc_array_2d(geom->cols, geom->rows, 1, DCELL_TYPE);
hc_x = N_read_rast_to_array_2d(param.hc_x->answer, hc_x);
N_convert_array_2d_null_to_zero(hc_x);
hc_y = N_alloc_array_2d(geom->cols, geom->rows, 1, DCELL_TYPE);
hc_y = N_read_rast_to_array_2d(param.hc_y->answer, hc_y);
N_convert_array_2d_null_to_zero(hc_y);
phead = N_alloc_array_2d(geom->cols, geom->rows, 1, DCELL_TYPE);
phead = N_read_rast_to_array_2d(param.phead->answer, phead);
N_convert_array_2d_null_to_zero(phead);
/* Set the inactive values to zero, to assure a no flow boundary */
for (y = 0; y < geom->rows; y++) {
for (x = 0; x < geom->cols; x++) {
stat = (int)N_get_array_2d_d_value(data->status, x, y);
if (stat == N_CELL_INACTIVE) { /*only inactive cells */
N_put_array_2d_d_value(data->diff_x, x, y, 0);
N_put_array_2d_d_value(data->diff_y, x, y, 0);
N_put_array_2d_d_value(data->cs, x, y, 0);
N_put_array_2d_d_value(data->q, x, y, 0);
}
}
}
/*compute the velocities */
N_math_array_2d(hc_x, data->nf, hc_x, N_ARRAY_DIV);
N_math_array_2d(hc_y, data->nf, hc_y, N_ARRAY_DIV);
N_compute_gradient_field_2d(phead, hc_x, hc_y, geom, data->grad);
/*Now compute the dispersivity tensor*/
N_calc_solute_transport_disptensor_2d(data);
/***************************************/
/*the Courant-Friedrichs-Lewy criteria */
/*Compute the correct time step */
if (geom->dx > geom->dy)
length = geom->dx;
else
length = geom->dy;
if (fabs(data->grad->max) > fabs(data->grad->min)) {
cfl = (double)data->dt * fabs(data->grad->max) / length;
time_step = 1*length / fabs(data->grad->max);
}
else {
cfl = (double)data->dt * fabs(data->grad->min) / length;
time_step = 1*length / fabs(data->grad->min);
}
G_message(_("The Courant-Friedrichs-Lewy criteria is %g it should be within [0:1]"), cfl);
G_message(_("The largest stable time step is %g"), time_step);
/*Set the number of inner loops and the time step*/
if (data->dt > time_step && param.cfl->answer) {
/*safe the user time step */
time_sum = data->dt;
time_loops = data->dt / time_step;
time_loops = floor(time_loops) + 1;
data->dt = data->dt / time_loops;
G_message(_("Number of inner loops is %g"), time_loops);
G_message(_("Time step for each loop %g"), data->dt);
}
else {
if(data->dt > time_step)
G_warning(_("The time step is to large: %gs. The largest time step should be of size %gs."), data->dt, time_step);
time_loops = loops;
data->dt = data->dt / loops;
}
N_free_array_2d(phead);
N_free_array_2d(hc_x);
N_free_array_2d(hc_y);
/*Compute for each time step*/
for (i = 0; i < time_loops; i++) {
G_message(_("Time step %i with time sum %g"), i + 1, (i + 1)*data->dt);
/*assemble the linear equation system and solve it */
les = create_solve_les(geom, data, call, solver, maxit, error, sor);
/* copy the result into the c array for output */
copy_result(data->status, data->c_start, les->x, ®ion, data->c, 1);
N_convert_array_2d_null_to_zero(data->c_start);
if (les)
N_free_les(les);
/*Set the start array*/
N_copy_array_2d(data->c, data->c_start);
/*Set the transmission boundary*/
N_calc_solute_transport_transmission_2d(data);
}
/*write the result to the output file */
N_write_array_2d_to_rast(data->c, param.output->answer);
/*Compute the the velocity field if required and write the result into three rast maps */
if (param.vector_x->answer || param.vector_y->answer) {
xcomp = N_alloc_array_2d(geom->cols, geom->rows, 1, DCELL_TYPE);
ycomp = N_alloc_array_2d(geom->cols, geom->rows, 1, DCELL_TYPE);
N_compute_gradient_field_components_2d(data->grad, xcomp, ycomp);
if (param.vector_x->answer)
N_write_array_2d_to_rast(xcomp, param.vector_x->answer);
if (param.vector_y->answer)
N_write_array_2d_to_rast(ycomp, param.vector_y->answer);
if (xcomp)
N_free_array_2d(xcomp);
if (ycomp)
N_free_array_2d(ycomp);
}
if (data)
N_free_solute_transport_data2d(data);
if (geom)
N_free_geom_data(geom);
if (call)
G_free(call);
return (EXIT_SUCCESS);
}
/* ************************************************************************* */
int main(int argc, char *argv[])
{
struct GModule *module = NULL;
N_gwflow_data2d *data = NULL;
N_geom_data *geom = NULL;
N_les *les = NULL;
N_les_callback_2d *call = NULL;
double *tmp_vect = NULL;
struct Cell_head region;
double error, sor, max_norm = 0, tmp;
int maxit, i, inner_count = 0;
char *solver;
int x, y, stat;
N_gradient_field_2d *field = NULL;
N_array_2d *xcomp = NULL;
N_array_2d *ycomp = NULL;
char *buff = NULL;
int with_river = 0, with_drain = 0;
/* Initialize GRASS */
G_gisinit(argv[0]);
module = G_define_module();
module->keywords = _("raster, hydrology");
module->description =
_("Numerical calculation program for transient, confined and unconfined groundwater flow in two dimensions.");
/* Get parameters from user */
set_params();
if (G_parser(argc, argv))
exit(EXIT_FAILURE);
/* Make sure that the current projection is not lat/long */
if ((G_projection() == PROJECTION_LL))
G_fatal_error(_("Lat/Long location is not supported by %s. Please reproject map first."),
G_program_name());
/*Check the river parameters */
if (param.river_leak->answer == NULL && param.river_bed->answer == NULL &&
param.river_head->answer == NULL) {
with_river = 0;
}
else if (param.river_leak->answer != NULL &&
param.river_bed->answer != NULL &&
param.river_head->answer != NULL) {
with_river = 1;
}
else {
G_fatal_error
(_("Please provide river_head, river_leak and river_bed maps"));
}
/*Check the drainage parameters */
if (param.drain_leak->answer == NULL && param.drain_bed->answer == NULL) {
with_drain = 0;
}
else if (param.drain_leak->answer != NULL &&
param.drain_bed->answer != NULL) {
with_drain = 1;
}
else {
G_fatal_error(_("Please provide drain_head and drain_leak maps"));
}
/*Set the maximum iterations */
sscanf(param.maxit->answer, "%i", &(maxit));
/*Set the calculation error break criteria */
sscanf(param.error->answer, "%lf", &(error));
sscanf(param.sor->answer, "%lf", &(sor));
/*set the solver */
solver = param.solver->answer;
if (strcmp(solver, N_SOLVER_DIRECT_LU) == 0 && param.sparse->answer)
G_fatal_error(_("The direct LU solver do not work with sparse matrices"));
if (strcmp(solver, N_SOLVER_DIRECT_GAUSS) == 0 && param.sparse->answer)
G_fatal_error(_("The direct Gauss solver do not work with sparse matrices"));
if (strcmp(solver, N_SOLVER_DIRECT_CHOLESKY) == 0 && param.sparse->answer)
G_fatal_error(_("The direct cholesky solver do not work with sparse matrices"));
/*get the current region */
G_get_set_window(®ion);
/*allocate the geometry structure for geometry and area calculation */
geom = N_init_geom_data_2d(®ion, geom);
/*Set the function callback to the groundwater flow function */
call = N_alloc_les_callback_2d();
N_set_les_callback_2d_func(call, (*N_callback_gwflow_2d)); /*gwflow 2d */
/*Allocate the groundwater flow data structure */
data =
N_alloc_gwflow_data2d(geom->cols, geom->rows, with_river, with_drain);
/* set the groundwater type */
if (param.type->answer) {
if (strncmp("unconfined", param.type->answer, 10) == 0) {
data->gwtype = N_GW_UNCONFINED;
}
else {
data->gwtype = N_GW_CONFINED;
}
}
/*Set the calculation time */
sscanf(param.dt->answer, "%lf", &(data->dt));
G_message("Calculation time: %g", data->dt);
/*read all input maps into the memory and take care of the
* null values.*/
N_read_rast_to_array_2d(param.phead->answer, data->phead);
N_convert_array_2d_null_to_zero(data->phead);
N_copy_array_2d(data->phead, data->phead_start);
N_read_rast_to_array_2d(param.status->answer, data->status);
N_convert_array_2d_null_to_zero(data->status);
N_read_rast_to_array_2d(param.hc_x->answer, data->hc_x);
N_convert_array_2d_null_to_zero(data->hc_x);
N_read_rast_to_array_2d(param.hc_y->answer, data->hc_y);
N_convert_array_2d_null_to_zero(data->hc_y);
N_read_rast_to_array_2d(param.s->answer, data->s);
N_convert_array_2d_null_to_zero(data->s);
N_read_rast_to_array_2d(param.top->answer, data->top);
N_convert_array_2d_null_to_zero(data->top);
N_read_rast_to_array_2d(param.bottom->answer, data->bottom);
N_convert_array_2d_null_to_zero(data->bottom);
/*river is optional */
if (with_river) {
N_read_rast_to_array_2d(param.river_bed->answer, data->river_bed);
N_read_rast_to_array_2d(param.river_head->answer, data->river_head);
N_read_rast_to_array_2d(param.river_leak->answer, data->river_leak);
N_convert_array_2d_null_to_zero(data->river_bed);
N_convert_array_2d_null_to_zero(data->river_head);
N_convert_array_2d_null_to_zero(data->river_leak);
}
/*drainage is optional */
if (with_drain) {
N_read_rast_to_array_2d(param.drain_bed->answer, data->drain_bed);
N_read_rast_to_array_2d(param.drain_leak->answer, data->drain_leak);
N_convert_array_2d_null_to_zero(data->drain_bed);
N_convert_array_2d_null_to_zero(data->drain_leak);
}
/*Recharge is optional */
if (param.r->answer) {
N_read_rast_to_array_2d(param.r->answer, data->r);
N_convert_array_2d_null_to_zero(data->r);
}
/*Sources or sinks are optional */
if (param.q->answer) {
N_read_rast_to_array_2d(param.q->answer, data->q);
N_convert_array_2d_null_to_zero(data->q);
}
/* Set the inactive values to zero, to assure a no flow boundary */
for (y = 0; y < geom->rows; y++) {
for (x = 0; x < geom->cols; x++) {
stat = N_get_array_2d_c_value(data->status, x, y);
if (stat == N_CELL_INACTIVE) { /*only inactive cells */
N_put_array_2d_d_value(data->hc_x, x, y, 0);
N_put_array_2d_d_value(data->hc_y, x, y, 0);
N_put_array_2d_d_value(data->s, x, y, 0);
N_put_array_2d_d_value(data->q, x, y, 0);
}
}
}
/*assemble the linear equation system and solve it */
les = create_solve_les(geom, data, call, solver, maxit, error, sor);
/* copy the result into the phead array for output or unconfined calculation */
copy_result(data->status, data->phead_start, les->x, ®ion,
data->phead);
N_convert_array_2d_null_to_zero(data->phead);
/****************************************************/
/*explicite calculation of free groundwater surface */
/****************************************************/
if (data->gwtype == N_GW_UNCONFINED) {
/* allocate memory and copy the result into a new temporal vector */
if (!(tmp_vect = (double *)calloc(les->rows, sizeof(double))))
G_fatal_error(_("Out of memory"));
/*copy data */
for (i = 0; i < les->rows; i++)
tmp_vect[i] = les->x[i];
/*count the number of inner iterations */
inner_count = 0;
do {
G_message(_("Calculation of unconfined groundwater flow loop %i\n"),
inner_count + 1);
/* we will allocate a new les for each loop */
if (les)
N_free_les(les);
/*assemble the linear equation system and solve it */
les =
create_solve_les(geom, data, call, solver, maxit, error, sor);
/*calculate the maximum norm of the groundwater height difference */
tmp = 0;
max_norm = 0;
for (i = 0; i < les->rows; i++) {
tmp = fabs(les->x[i] - tmp_vect[i]);
if (max_norm < tmp)
max_norm = tmp;
/*copy the result */
tmp_vect[i] = les->x[i];
}
G_message(_("Maximum difference between this and last increment: %g"),
max_norm);
/* copy the result into the phead array */
copy_result(data->status, data->phead_start, les->x, ®ion,
data->phead);
N_convert_array_2d_null_to_zero(data->phead);
/**/ inner_count++;
}
while (max_norm > 0.01 && inner_count < 50);
if (tmp_vect)
free(tmp_vect);
}
/*write the result to the output file */
N_write_array_2d_to_rast(data->phead, param.output->answer);
/*release the memory */
if (les)
N_free_les(les);
/*Compute the the velocity field if required and write the result into three rast maps */
if (param.vector->answer) {
field =
N_compute_gradient_field_2d(data->phead, data->hc_x, data->hc_y,
geom, NULL);
xcomp = N_alloc_array_2d(geom->cols, geom->rows, 1, DCELL_TYPE);
ycomp = N_alloc_array_2d(geom->cols, geom->rows, 1, DCELL_TYPE);
N_compute_gradient_field_components_2d(field, xcomp, ycomp);
G_asprintf(&buff, "%s_x", param.vector->answer);
N_write_array_2d_to_rast(xcomp, buff);
G_asprintf(&buff, "%s_y", param.vector->answer);
N_write_array_2d_to_rast(ycomp, buff);
if (buff)
G_free(buff);
if (xcomp)
N_free_array_2d(xcomp);
if (ycomp)
N_free_array_2d(ycomp);
if (field)
N_free_gradient_field_2d(field);
}
if (data)
N_free_gwflow_data2d(data);
if (geom)
N_free_geom_data(geom);
if (call)
G_free(call);
return (EXIT_SUCCESS);
}
