Choosing diffusion coefficient and other parameters for r.sim.water in GRASS7?Methodology for creating...
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Choosing diffusion coefficient and other parameters for r.sim.water in GRASS7?
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I'm trying to run r.sim.water in GRASS7 to simulate overland flow during a heavy rain event.
My DEM has a resolution of 1m. I prepared it by adding values for buildings and included ditches and culverts using r.carve. I calculated xy-derivatives using r.slope.aspect.
My study area is about 8,5 sq km. I was not able to run r.sim.water with 1m resolution so I changed the resolution to 2m using r.resamp.rst. Including NULLS, the input raster size is now about 4.000.000 cells. r.sim.water did still not launch so I changed the number of walkers to the exact number of cells (instead of twice the number).
Now I get values for water depth that are far higher than the actual depression underlying the cells, which is physically not possible. Changing the value for the Manning coefficient even increases those "water mountains".
I think, to avoid this I have to change the diffusion coefficient and/or the values for hmax, halpha and hbeta. However, I have no idea of how they actually influence my result or what could be reasonable values for my purpose. Does anyone have experiences with that or can tell me where I could find information about it?
Besides, the water depth after 10min is far higher if I set the duration to 60 or 120 min as if I chose, for example, only 30 min, which also doesn't seem logical to me. Can anyone tell me why this could happen?
I did not find any information about a maximum number of cells for the input DEM. However, I think r.sim.water cannot handle large areas or high numbers of walkers. Does anyone know if there are limitations for the calculation?
raster grass hydrology grass-7.0 simulation
edited 13 mins ago
Andre Silva
7,735113685
asked Sep 2 '16 at 8:07
a-haa-ha
113
add a comment |
I'm trying to run r.sim.water in GRASS7 to simulate overland flow during a heavy rain event.
My DEM has a resolution of 1m. I prepared it by adding values for buildings and included ditches and culverts using r.carve. I calculated xy-derivatives using r.slope.aspect.
My study area is about 8,5 sq km. I was not able to run r.sim.water with 1m resolution so I changed the resolution to 2m using r.resamp.rst. Including NULLS, the input raster size is now about 4.000.000 cells. r.sim.water did still not launch so I changed the number of walkers to the exact number of cells (instead of twice the number).
Now I get values for water depth that are far higher than the actual depression underlying the cells, which is physically not possible. Changing the value for the Manning coefficient even increases those "water mountains".
I think, to avoid this I have to change the diffusion coefficient and/or the values for hmax, halpha and hbeta. However, I have no idea of how they actually influence my result or what could be reasonable values for my purpose. Does anyone have experiences with that or can tell me where I could find information about it?
Besides, the water depth after 10min is far higher if I set the duration to 60 or 120 min as if I chose, for example, only 30 min, which also doesn't seem logical to me. Can anyone tell me why this could happen?
I did not find any information about a maximum number of cells for the input DEM. However, I think r.sim.water cannot handle large areas or high numbers of walkers. Does anyone know if there are limitations for the calculation?
raster grass hydrology grass-7.0 simulation
edited 13 mins ago
Andre Silva
7,735113685
asked Sep 2 '16 at 8:07
a-haa-ha
113
To my knowledge e.g. 2-3 walkers per cell could be specified. Still that would become a large amount given your input raster size. Did any error messages appear?
– markusN
Sep 26 '16 at 21:21
Do you have any solution found to this question?
– Am D. Avid
Jun 5 '17 at 13:23
add a comment |
I'm trying to run r.sim.water in GRASS7 to simulate overland flow during a heavy rain event.
My DEM has a resolution of 1m. I prepared it by adding values for buildings and included ditches and culverts using r.carve. I calculated xy-derivatives using r.slope.aspect.
My study area is about 8,5 sq km. I was not able to run r.sim.water with 1m resolution so I changed the resolution to 2m using r.resamp.rst. Including NULLS, the input raster size is now about 4.000.000 cells. r.sim.water did still not launch so I changed the number of walkers to the exact number of cells (instead of twice the number).
Now I get values for water depth that are far higher than the actual depression underlying the cells, which is physically not possible. Changing the value for the Manning coefficient even increases those "water mountains".
I think, to avoid this I have to change the diffusion coefficient and/or the values for hmax, halpha and hbeta. However, I have no idea of how they actually influence my result or what could be reasonable values for my purpose. Does anyone have experiences with that or can tell me where I could find information about it?
Besides, the water depth after 10min is far higher if I set the duration to 60 or 120 min as if I chose, for example, only 30 min, which also doesn't seem logical to me. Can anyone tell me why this could happen?
I did not find any information about a maximum number of cells for the input DEM. However, I think r.sim.water cannot handle large areas or high numbers of walkers. Does anyone know if there are limitations for the calculation?
raster grass hydrology grass-7.0 simulation
edited 13 mins ago
Andre Silva
7,735113685
asked Sep 2 '16 at 8:07
a-haa-ha
113
I'm trying to run r.sim.water in GRASS7 to simulate overland flow during a heavy rain event.
My DEM has a resolution of 1m. I prepared it by adding values for buildings and included ditches and culverts using r.carve. I calculated xy-derivatives using r.slope.aspect.
My study area is about 8,5 sq km. I was not able to run r.sim.water with 1m resolution so I changed the resolution to 2m using r.resamp.rst. Including NULLS, the input raster size is now about 4.000.000 cells. r.sim.water did still not launch so I changed the number of walkers to the exact number of cells (instead of twice the number).
Now I get values for water depth that are far higher than the actual depression underlying the cells, which is physically not possible. Changing the value for the Manning coefficient even increases those "water mountains".
I think, to avoid this I have to change the diffusion coefficient and/or the values for hmax, halpha and hbeta. However, I have no idea of how they actually influence my result or what could be reasonable values for my purpose. Does anyone have experiences with that or can tell me where I could find information about it?
Besides, the water depth after 10min is far higher if I set the duration to 60 or 120 min as if I chose, for example, only 30 min, which also doesn't seem logical to me. Can anyone tell me why this could happen?
I did not find any information about a maximum number of cells for the input DEM. However, I think r.sim.water cannot handle large areas or high numbers of walkers. Does anyone know if there are limitations for the calculation?
raster grass hydrology grass-7.0 simulation
raster grass hydrology grass-7.0 simulation
edited 13 mins ago
Andre Silva
7,735113685
asked Sep 2 '16 at 8:07
a-haa-ha
113
edited 13 mins ago
Andre Silva
7,735113685
asked Sep 2 '16 at 8:07
a-haa-ha
113
edited 13 mins ago
Andre Silva
7,735113685
edited 13 mins ago
Andre Silva
7,735113685
edited 13 mins ago
Andre Silva
7,735113685
7,735113685
asked Sep 2 '16 at 8:07
a-haa-ha
113
asked Sep 2 '16 at 8:07
a-haa-ha
113
asked Sep 2 '16 at 8:07
a-haa-ha
113
113
To my knowledge e.g. 2-3 walkers per cell could be specified. Still that would become a large amount given your input raster size. Did any error messages appear?
– markusN
Sep 26 '16 at 21:21
Do you have any solution found to this question?
– Am D. Avid
Jun 5 '17 at 13:23
add a comment |
To my knowledge e.g. 2-3 walkers per cell could be specified. Still that would become a large amount given your input raster size. Did any error messages appear?
– markusN
Sep 26 '16 at 21:21
Do you have any solution found to this question?
– Am D. Avid
Jun 5 '17 at 13:23
To my knowledge e.g. 2-3 walkers per cell could be specified. Still that would become a large amount given your input raster size. Did any error messages appear?
– markusN
Sep 26 '16 at 21:21
To my knowledge e.g. 2-3 walkers per cell could be specified. Still that would become a large amount given your input raster size. Did any error messages appear?
– markusN
Sep 26 '16 at 21:21
Do you have any solution found to this question?
– Am D. Avid
Jun 5 '17 at 13:23
Do you have any solution found to this question?
– Am D. Avid
Jun 5 '17 at 13:23
add a comment |
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To my knowledge e.g. 2-3 walkers per cell could be specified. Still that would become a large amount given your input raster size. Did any error messages appear?
– markusN
Sep 26 '16 at 21:21
Do you have any solution found to this question?
– Am D. Avid
Jun 5 '17 at 13:23