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DELWAQ

DELWAQ is the engine of the D-Water Quality and D-Ecology programmes of the Delft3D suite. It is based on a rich library from which relevant substances and processes can be selected to quickly put water and sediment quality models together.

The processes library covers many aspects of water quality and ecology, from basic tracers, dissolved oxygen, nutrients, organic matter, inorganic suspended matter, heavy metals, bacteria and organic micro-pollutants, to complex algae and macrophyte dynamics. High performance solvers enable the simulation of long periods, often required to capture the full cycles of the processes being modelled.

The finite volume approach underlying DELWAQ allows it to be coupled to both the structured grid hydrodynamics of the current Delft3D-FLOW engine and the upcoming D-Flow Flexible Mesh engine (1D-2D-3D) of the Delft3D Flexible Mesh Suite (or even other models such as TELEMAC).

'DELWAQ in open source' is our invitation to all leading experts to collaborate in further development and research in the field of water quality, ecology and morphology using Delft3D. Feel free to post your DELWAQ related questions or comments in this dedicated forum space. If you are new to DELWAQ, the tutorial (in the user manual) is a good place to start. A list of DELWAQ related publications is available here.

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D-Flow Flexible Mesh
DELWAQ

Cohesive sediments & muddy systems

 


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swan diag warning - length of segment short

KS
Kit Stokes, modified 1 Year ago.

swan diag warning - length of segment short

Youngling Posts: 8 Join Date: 11/8/16 Recent Posts
Hi all,

I'm getting a warning from a coupled wave-flow simulation in the swn-diag file for one of my four boundaries. The warning says:

"** Warning : Length of segment short, boundary values ignored".

I'm running condspecatdist using 2D spectra files as input at each location specified by condspecatdist. As you can see from an extract of the swn-diag file below, I'm not getting the warning at any of the other three boundaries. Oddly, the results seem to be ok, and I can see waves propagating in from all segments of all boundaries, so it would seem that it is not ignoring the boundary values, as the warning below indicates. But the warning is worrying, as I'm not sure why it is there, or what effect it is having in the model. Does anyone have any experience with this issue?

It looks like this:

BOUN SEGM IJ 0 240 153 240 &
VAR FILE 3.18 'North_2DSpec_1.bnd' 1 &
2.98 'North_2DSpec_2.bnd' 1 &
** Warning : Length of segment short, boundary values ignored
segment length= 2.13; [len]= 2.98
2.73 'North_2DSpec_3.bnd' 1 &
** Warning : Length of segment short, boundary values ignored
segment length= 2.13; [len]= 2.73
2.39 'North_2DSpec_4.bnd' 1 &
** Warning : Length of segment short, boundary values ignored
segment length= 2.13; [len]= 2.39
2.06 'North_2DSpec_5.bnd' 1 &
** Warning : Length of segment short, boundary values ignored
segment length= 2.13; [len]= 2.06
1.81 'North_2DSpec_6.bnd' 1
** Warning : Length of segment short, boundary values ignored
segment length= 2.13; [len]= 1.81

BOUN SHAPE JONSWAP 3.30 PEAK DSPR POWER

BOUN SEGM IJ 355 0 355 29 &
VAR FILE 0.00 'East_2DSpec_1.bnd' 1 &
0.19 'East_2DSpec_2.bnd' 1 &
0.26 'East_2DSpec_3.bnd' 1

BOUN SHAPE JONSWAP 3.30 PEAK DSPR POWER

BOUN SEGM IJ 4 0 355 0 &
VAR FILE 0.04 'South_2DSpec_1.bnd' 1 &
0.21 'South_2DSpec_2.bnd' 1 &
0.46 'South_2DSpec_3.bnd' 1 &
0.78 'South_2DSpec_4.bnd' 1 &
1.11 'South_2DSpec_5.bnd' 1 &
1.36 'South_2DSpec_6.bnd' 1 &
1.69 'South_2DSpec_7.bnd' 1 &
2.03 'South_2DSpec_8.bnd' 1 &
2.28 'South_2DSpec_9.bnd' 1 &
2.61 'South_2DSpec_10.bnd' 1 &
2.86 'South_2DSpec_11.bnd' 1 &
3.18 'South_2DSpec_12.bnd' 1

BOUN SHAPE JONSWAP 3.30 PEAK DSPR POWER

BOUN SEGM IJ 0 0 0 240 &
VAR FILE 2.15 'West_2DSpec_1.bnd' 1 &
2.02 'West_2DSpec_2.bnd' 1 &
1.69 'West_2DSpec_3.bnd' 1 &
1.36 'West_2DSpec_4.bnd' 1 &
1.10 'West_2DSpec_5.bnd' 1 &
0.78 'West_2DSpec_6.bnd' 1 &
0.45 'West_2DSpec_7.bnd' 1 &
0.20 'West_2DSpec_8.bnd' 1 &
0.00 'West_2DSpec_9.bnd' 1

$


Thanks in advance!
KS
Kit Stokes, modified 1 Year ago.

RE: swan diag warning - length of segment short

Youngling Posts: 8 Join Date: 11/8/16 Recent Posts
I eventually resolved this issue. I had mistakenly entered condspecatdist as the distance from the corner of the grid to each forcing location, rather than the distance from the start of the boundary segment to each forcing location. As the north boundary segment started half way along the side of the grid, this meant that the distances were actually off the edge of the grid, hence the warning. Now that I've resolved that issue, the warnings in the swan diag file have dissapeared.