Dear
with regard to matlab routines which create child grid for nesting (such as create_nested_grid.m) it is possible to define new masking and bathymetry. Would you please tell me when creating child grid it is possible to:
1-change number of layers in child grid compared to parent grid?
2-change minimum depth of child grid compared to parent grid?
Cheers
pooran
nested grid layer and min depth
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pooran
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Re: nested grid layer and min depth
Dear
in my test, nesting will occur between near-shore and offshore. and i have Multiple Refinement Sub-Class grids. would you please tell me that
1-is it possible to define another minimum depth (hmin) for first Refinement Grid from parent grid? If yes, how?
2-is it possible to define another minimum depth (hmin) for second Refinement Grid from first refined grid? And so on...
Cheers
pooran
in my test, nesting will occur between near-shore and offshore. and i have Multiple Refinement Sub-Class grids. would you please tell me that
1-is it possible to define another minimum depth (hmin) for first Refinement Grid from parent grid? If yes, how?
2-is it possible to define another minimum depth (hmin) for second Refinement Grid from first refined grid? And so on...
Cheers
pooran
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pooran
- Posts: 72
- Joined: Fri Jan 31, 2014 5:54 pm
- Location: Khoramshahr Marine Science and Technology Universi
Re: nested grid layer and min depth
Sorry 
i would like to change my question
1-does it important that child's masking and bathymetry to be consistent with parent's masking and bathymetry, respectively, just at the boundaries points:? it means: is it possible to change masking and bathymetry of new refined grid in overlapping region
2-If User will allowed to modify the masking and bathymetry of new grid in overlapping region, Would you please guide me how can? Manually or there is some other way
many thanks for any reply that can help me to do refinement
cheers
pooran
i would like to change my question1-does it important that child's masking and bathymetry to be consistent with parent's masking and bathymetry, respectively, just at the boundaries points:? it means: is it possible to change masking and bathymetry of new refined grid in overlapping region
2-If User will allowed to modify the masking and bathymetry of new grid in overlapping region, Would you please guide me how can? Manually or there is some other way
many thanks for any reply that can help me to do refinement
cheers
pooran
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pooran
- Posts: 72
- Joined: Fri Jan 31, 2014 5:54 pm
- Location: Khoramshahr Marine Science and Technology Universi
Re: nested grid layer and min depth
sorry I cant completely catch nestlayers and gridsinlayer. Would you please help me with second post's figure as an example: should it be set as:
Ngrids= 4
nestlayers=4
gridsinlayer=1 2 3 4
2-if there is two child grids and one parent (in mentioned figure) then is it true to set:
Ngrids= 3
nestlayers=3
grids in layer=1 2 3
Ngrids= 4
nestlayers=4
gridsinlayer=1 2 3 4
2-if there is two child grids and one parent (in mentioned figure) then is it true to set:
Ngrids= 3
nestlayers=3
grids in layer=1 2 3
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pooran
- Posts: 72
- Joined: Fri Jan 31, 2014 5:54 pm
- Location: Khoramshahr Marine Science and Technology Universi
Re: nested grid layer and min depth
Sorry but I become grateful to know that for figure in second post is it true to set Ngrids, nestlayers and gridinlayer flags (in ocean.in file) like bellow?
Ngrids= 4
nestlayers=4
gridsinlayer=1 2 3 4
Sorry but I can’t find any test to find my answer therefore I need your experience for my set up(if it is possible)
Thanks for any reply
Ngrids= 4
nestlayers=4
gridsinlayer=1 2 3 4
Sorry but I can’t find any test to find my answer therefore I need your experience for my set up(if it is possible)
Thanks for any reply
Re: nested grid layer and min depth
It has been mentioned that it currently only supports one parent with one child grid. No grandchildren as yet.
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pooran
- Posts: 72
- Joined: Fri Jan 31, 2014 5:54 pm
- Location: Khoramshahr Marine Science and Technology Universi
Re: nested grid layer and min depth
is it true for COAWST updated code, too?It has been mentioned that it currently only supports one parent with one child grid. No grandchildren as yet.
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arango
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Re: nested grid layer and min depth
It has been mentioned several times in this forum that more than two nesting layers for refinement grids still need some debugging for NestLayers > 2. Your configuration with four grids is very poor and ill-posed in my opinion. Obviously, you need to gain more experience with nested grids and ocean modeling. A configuration like the one in your diagram will be subject to a lot of new physics due the ratio of refinement between the coarser and the finer grids. If you require such a high resolution in such a small coastal area, you started with the wrong resolution for the coarser grid 
The two-way interaction between four grids will yield a lot of high-frequency contamination between grids.
I will recommend for you to start simpler. Use two grids and gain more experience with ROMS and numerical modeling.
The two-way interaction between four grids will yield a lot of high-frequency contamination between grids.I will recommend for you to start simpler. Use two grids and gain more experience with ROMS and numerical modeling.