[Dhsvm-users] How to remove the DEM sink

[Ed Salminen]

The problem may be that you filled sinks in your DEM in a GIS that used 
an eight direction (D8) flow direction approach, but DHSVM uses a four 
direction (D4) approach as described in the snippet you included below.

Did you run the FILL_SINKS_DHSVM.c program to prepare your DEM prior to 
running DHSVM? This will fill the sinks in the DEM using a D4 approach. 
The source code (if you don't already have it) can be found here: 
https://github.com/pnnl/DHSVM-PNNL/blob/master/DHSVM/program/FILL_SINKS_DHSVM.c

Alternatively there now appears to be a way to configure DHSVM to use a 
D8 approach. If you go to this page (https://github.com/pnnl/DHSVM-PNNL) 
and scroll to the bottom under "Experimental Surface/Subsurface Mode" it 
describes how you can enable the D8 approach when building the model 
with CMake.

I hope that helps.

E


On 6/7/2023 12:20 AM, 2330152080 wrote:

> Hello:

> I find the final surface runoff appears abnormally large in the final 

> mass balance file. You can see the first figure.

> Although I have read the Q&A about this question, but I really did't 

> know how to resolve it. (fig2)

> I hope you can give me some advice. Thank you very much for your time.

> Shutao Wang

>

>

>

>                                 fig1

>

>                                                        fig2

>

>

>

>

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-- 
Ed Salminen, Hydrologist
Watershed Professionals Network LLC
PO Box 8 | Mount Hood Parkdale, OR 97041
(541) 490-6644
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