Author Topic: Quadrangular mesh based on cross section  (Read 644 times)

Sebastian

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Quadrangular mesh based on cross section
« on: November 13, 2018, 03:05:18 pm »
Hej,

I'm planning to model a river including its floodplain and I'm not quite sure, what the best way is to do so. The floodplain will be based on a digital elevation model and will be modeled as a flexible mesh; easy so far.
But how can I model the river based on river cross sections (point-shapefile) as an quadrangular mesh? Would you simply digitalize the left and right river bank (f. ex. based on aerial images as polyline; without Z-Information) and import them as arcs, connect the alternate ends by arcs as well, redistribute the vertices of the two river bank arcs, generate the mesh AND afterwards apply the Z-information based on the river cross sections by importing the points from the point-shapefile as .xyz-file?

Coming from other software I'm used to a different approach: Import the cross section points (with Z-Information) and connect the single points by arcs and afterwards generate the mesh to ensure that each measured cross section point is part of the generated mesh.

Feedback & ideas are much appreciated, cheers.

Sebastian

Christian Tomsu

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Re: Quadrangular mesh based on cross section
« Reply #1 on: December 17, 2018, 10:36:26 am »
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
Project management / Modelling / Advisor
SPEKTER GmbH
Herzogenaurach

hzaifoglu

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Re: Quadrangular mesh based on cross section
« Reply #2 on: December 17, 2018, 02:58:58 pm »
Hi,

I understand that you only have point data of your cross-sections not any data between successive cross sections right? not dense data or point cloud?

My suggestion is using of ArcGIS. Model your river there and then convert it to ASCII points which is XXX.xyz. Then import it to mesh generator tool in order to interpolate and create your floodplain.

Hasan

Sebastian

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Re: Quadrangular mesh based on cross section
« Reply #3 on: December 18, 2018, 02:52:12 pm »
Hi Christian & Hasan,

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

No yet. To be honest I didn't have the time to figure it out and hoped someone knew a solution, sorry. :D

Quote
We for ourselfs have solved the mentioned problem with a GIS - Tool inside our toolbox.
Interesting, could you explain how you do that in GIS (I'm quite familiar with ArcGIS).
Quote
I understand that you only have point data of your cross-sections not any data between successive cross sections right? not dense data or point cloud?
Thats absolutely right, thanks!

Do you have any hints how you would do that in GIS?

Creating the quadrangular-mesh (without Z-Information) in MIKE21 ain't perfect, but it works. I'm just afraid that the Z-Interpolation based on only those cross-section height points is going to create a weird z-interpolated-mesh between those single-cross-sections.

Thanks in advance!
Sebastian

« Last Edit: December 19, 2018, 09:18:38 am by Sebastian »

Sebastian

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Re: Quadrangular mesh based on cross section
« Reply #4 on: January 17, 2019, 06:10:55 am »
Any hints?  :)

Matinaz

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Re: Quadrangular mesh based on cross section
« Reply #5 on: December 18, 2019, 10:41:37 am »
Thanks for the knowledge