intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 
 

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Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

Message Boards

ERROR: SWAN file PRINT contains ERRORS

MJ
Mansur Ali Jisan, modified 5 Years ago.

ERROR: SWAN file PRINT contains ERRORS

Youngling Posts: 8 Join Date: 1/19/14 Recent Posts
Dear,

I'm trying to run delft 3D by coupling flow module with wave module. But I'm facing trouble while running the mdw. AFter the iterations it dispalys the error:" ERROR: SWAN file PRINT contains ERRORS"

I've tried to understand the problem by reading the PRINT file but I've failed. The run also produces SWANTOUT 1 and SWANOUT 2 files. The errors in the PRINT file are the following:


READINP BOTTOM 1.0 'BOTNOW' 4 0 FREE
** Error : Grid angle <0 or >180 degrees
9427 84.7991 19.1320 10427 84.9398 19.2944 10428 85.0506 19.3545
** Error : Grid angle <0 or >180 degrees
11428 85.1380 19.4257 10428 85.0506 19.3545 10427 84.9398 19.2944
** Error : Grid angle <0 or >180 degrees
13427 85.5960 19.6923 13428 85.4949 19.6666 12428 85.3943 19.6450



Please somebody help me out of this problem. I've attached the PRINT file and related files with this message.
RK
Rohit Kulkarni, modified 5 Years ago.

RE: ERROR: SWAN file PRINT contains ERRORS

Youngling Posts: 8 Join Date: 8/16/12 Recent Posts
It is the grid. At the land boundaries, the grid orthogonality is very high. Although FLOW can handle this, SWAN needs fairly orthogonal grids. Also, I don't think SWAN can handle the changes in grid when we do line to land boundary as the grid angle changes more than 180 degree. A solution can be to derefine the grid or use curvilinear grid.

I had the same problem and I nested two grids with a large derefined grid and a refined smaller grid in the area of interest.
Hope it helps.
Cheers.
Ali Rezaie, modified 5 Years ago.

RE: ERROR: SWAN file PRINT contains ERRORS

Youngling Posts: 14 Join Date: 3/13/13 Recent Posts
Dear Ruhit,

Thank you for your help. We solved the problem using a smaller coarse grid in the wave module. Since the river system we're dealing is highly curvy, so it won't be any use for us if we use fairly straight grid. is there any other way we could use curvy grid in the WAVE module with flow ?

Regards
Rezaie
Jonathan Ray Abat, modified 3 Years ago.

RE: ERROR: SWAN file PRINT contains ERRORS

Youngling Posts: 11 Join Date: 7/10/14 Recent Posts
Hello Ali,

I was wondering what you mean about the smaller coarse grid?

Is it a smaller domain with coarse grid?
or is it a domain with smaller grid on a coarse domain?

I have a similar situation with you and your colleague but I don't know where to start to fix the error.

Best,

Jonathan