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waterdepth.ca
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waterdepth.ca
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/*
Copyright (c) 2013 Centre for Water Systems,
University of Exeter
This file is part of cafloodpro.
cafloodpro is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
// Update the water depth for
// OUTF1 constains the outflow of this step
// OUTF2 constains the outflow to erase
CA_FUNCTION waterdepth(CA_GRID grid, CA_CELLBUFF_REAL_IO WD,
CA_EDGEBUFF_REAL_I OUTF1, CA_EDGEBUFF_REAL_IO OUTF2,
CA_CELLBUFF_STATE_I MASK,
CA_GLOB_REAL_I dt)
{
// Initialise the grid
CA_GRID_INIT(grid);
// ERASE OUTF BUFFER 2
for(int k=1; k<=caUpdateEdges(grid); ++k)
caWriteEdgeBuffReal(grid,OUTF2,k,0.0);
// Create the arrays which will contain the water fluxes on the
// edges.
CA_ARRAY_CREATE(grid, CA_REAL, FLUXES1, caEdges+1);
// Read Mask.
CA_STATE mask = caReadCellBuffState(grid,MASK,0);
// Read bit 0 (false the main cell has nodata)
CA_STATE bit0 = caReadBitsState(mask,0,1);
// Read bit 31 (true if the main cell is nodata in at least one
// neighbour has data)
CA_STATE bit31 = caReadBitsState(mask,31,32);
// If the main cell has no data and none of the neighbour has data,
// then do nothing.
if(bit0 == 0 && bit31 == 0)
return;
// Read the fluxes of the main cell.
caReadEdgeBuffRealEdgeArray(grid, OUTF1,0, FLUXES1);
// Retrive the current value of the water depth.
CA_REAL wd = caReadCellBuffReal(grid,WD,0);
// Retrive the area of the main cell.
CA_REAL area = caArea(grid,0);
CA_REAL outflux = 0.0;
// Loop through the edges.
for(int e=1; e<=caEdges; e++)
{
// If the edge is one of the edges that can be updated without
// overwriting the buffer, the outflux is positive otherwise is
// negative.
if(e<=caUpdateEdges(grid))
outflux += FLUXES1[e];
else
outflux -= FLUXES1[e];
}
// Remove the outflux volume from the next step of the water depth.
// Add the rain
caWriteCellBuffReal(grid,WD,wd-(outflux/area));
}