Christian Tomsu Germany

Hi Sebastian,

would be interesting, if you got any solution for that.

As I know, there is unfortunately no tool inside MIKE. You have to dodge to other softwares.
We for ourselfs have solved the mentioned problem with a GIS - Tool inside our toolbox.

Bests
Christian

Hi Hasan,

the Hazard Map Tool is associated with the MIKE version.
Thus, normally it should work without problems.

Which parameters contains your result DFSU ??
... The 2-dimensional results file (dfs2 or dfsu) should contain (Surface Elevation, Total water depth, Current speed) for dfsu files ...

Is this fulfilled with your DFSU - file.

Bests
Christian

Hi,

for this detailed investigation, it will be good to use MIKE FLOOD.
Here you will be able to use flexible meshes, which are very fine in hydraulic relevant structures and coarser in flat areas.

Bests
Christian

Hi Sam,

I could imagine two more issues, which could raise your difficulties:

1. the mesh resolution around the boundary could be to coarse.
2. Some of your boundary nodes are above your assigned boundary water level.

Aah - yes - please keep in mind, that you have to assign absolute surface water levels and not water depths.

Bests
Christian

Hi,

you can try to set initial conditions, which are close to your initial boundary conditions.
Maybe, MIKE is more stable, if you have some wetted elements already.



Bests
Christian

Hi Sam,

I would assume, that the boundary works in both directions: inflow AND outflow.

You can stable your boundary condition, if you apply initial conditions identical to the intial state of the boundary condition. MIKE will simulate faster and more stable, if there are already wetted cells in the model.
Alternatively, you can try to apply a soft start.

Hope that helps
Christian.

Hi,

do you use the MIKE21FM with GPU ? This will accelerate the simulation extremely. You can even use more than 1 GPU..

On the other hand: how many elements do you have ?
Have you already optimized your mesh? No small elements, no large element changes ?

You can output quality parameters which indicate unstable or critical elements during the simulation thus you can optimize those areas.

Finally:
You can try to use the low order integration and discretization schemes -> this will also accelerate the simulation.
If you do so, you should carefully check the results.

Hope that helps a bit.

Bests Christian

Hi Sam,

when you use the tool Raster tp Polygon you have the possibility to simplify the polygons.
You should always check this option.

This generates much smaller polygons which significant less vertices.

Bests Christian.

Hi Sam,

I would recommend following:

1. Reduce number of vertices: you can do this via GIS -> Generalize function.
Use a small tolerance, then ArcGIS will keep the general geometry but will remove all vertices on straight line segments.

2. Reduce Number of polygons if possible. GIS offer here an aggregate function.

3. Sometimes it helps to simplify complex polygons and divide them into smaller simpler polygons.

4. It could also help to
a) export all arcs as XYZ
b) import to a GIS
c) reimport from GIS via XYZ into MIKE21FM.
MIKE21Fm then likely reorganizes the lines and polygons. This leads to a much better performance and could help to generate your mesh.

Bests
Christian

Hi,

to interpolate your station locations to polygonal area you can use the PRE PROCESSING TEMPORAL DATA tool from the MZ-Toolbox.
You can choose in which way your station information is interpolated, amongst other you can choose Thiessen polygons.

Maybe this helps to find the corresponding polygons.

Bests
Christian