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

 

 

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Curvilinear grid - Define boundary conditions with spectral files

JM
Joao Morim do Nascimento, modified 6 Years ago.

Curvilinear grid - Define boundary conditions with spectral files

Youngling Posts: 13 Join Date: 3/8/13 Recent Posts
Hello,

I have been working with DELFT3D during the last couple of months, however, I have had some issues about how to settle my spectral boundary files on a curvilinear grid. My spectral files are time series of directional wave spectra (as attached), which I would like to upload along my curvilinear boundary. I have read the manual hundreds of times, however, I still cannot get it.

For this type of grid should I use orientation, grid coordinates or grid cells?and how can I define the location of my files along my boundary, when using orientation, grid coordinates and grid cell?Honestly, the manual is very scarce and do not provide a clear understanding of how to do this.

Each one of my spectra files has already a location on top (as attached), however, I am convinced that DELFT3D does not take it into consideration as the user still needs to define the desired location along the boundary (boundary menu).

'Distance from corner point
It is the distance from the rst point of the side or segment to the point along
the side or segment for which the incident wave spectrum is prescribed. Note
that these points do not have to coincide with grid points of the computational
grid. Distance from corner point is the distance in [m], not in grid steps. The
values should be given in ascending order. The length along a side is measured in
clockwise or counter-clockwise direction depending on the option Wave angle (see
below). In case of a Segment option the length is measured from the indicated
begin point of the segment.'

How can i measure the distance between the corner point of my curvilinear grid until the location that I am specifying the spectra if my grid is curvilinear (I cannot get it).

I have ran a rectangular grid and it worked fine, which proves that my files are performing well. I just need to make those files work on a curvilinear grid to include additional displaced points.

Thank you very much, I really appreciate your time!

Attachments:

AV
Arnold van Rooijen, modified 6 Years ago.

RE: Curvilinear grid - Define boundary conditions with spectral files

Padawan Posts: 73 Join Date: 11/7/11 Recent Posts
Hi Joao,

In my opinion the 'orientation' option is the preferred one, but I have had situations in which this did not work out (especially very curved grids, like yours) and I had to do use the grid coordinates option. What you can do is load your grid in RGFGrid and check the grid administration (M,N values). Then you should know which values are at the boundary where you want to put a certain condition. If you have measurements at a certain location you could also use the X,Y option, but personally I like the grid coordinate option better.

Hope this helps.

Cheers,
Arnold
NL
Noel Leo, modified 2 Months ago.

RE: Curvilinear grid - Define boundary conditions with spectral files

Youngling Posts: 9 Join Date: 12/24/19 Recent Posts
The dynamic physical system book is just created for the purpose of learning and people get benefits of it. You should write more books on it and share your experience. devops security testing