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

uniform waste load at bank

JB
James Bishop, modified 3 Years ago.

uniform waste load at bank

Youngling Posts: 5 Join Date: 3/31/16 Recent Posts
Hi,

I am trying to understand how to implement a uniform waste load at the bank. I have reviewed the user manual regarding this type of waste load, though information on this is sparse.

I understand I need to add the following to the substance file under the substance that I want discharging from the bank:

parameter 'Length'
description 'Bank length'
unit '(m)'
value 0.0000E-00
end-parameter

Is the value in the above snippet supposed to remain as 00000E-00 or is value supposed to be changed to represent the length of the bank? What if the bank occurs over many cells?

What are the units for the bank waste load? Is it a mass load in g/s/meter of bank?

Thanks,
James
MJ
Michelle Jeuken, modified 3 Years ago.

RE: uniform waste load at bank

Jedi Knight Posts: 156 Join Date: 1/21/13 Recent Posts
This is one of these features that is handy, but as far as I know hardly used. You have the first steps right, by adding this parameter to the sub file. Unless you have a uniform river with the same length of banks per segment, you will have to define a spatially varying field.

You can do this using the quickin tool in the grid menu, although it doesn't contain any special features to determine bank length (it is developed to make a bathymetry or concentration field). This will generate an ascii-file with a value per segment.

But you could also use other means to create such a file, as long as you keek the order of the segments. For example, export the grid to a shape-file using quickplot, and do the determination of the bank length per segment in ArcGIS or an other GIS-tool, and export the database data of the 'bank length' column to a single column csv file.

If you work with a 3D model, you will have to extent the file to cover all the segments, also in the third dimension. You will have to add ('number of layers' -1) * 'number of segmetns per layer' of zero's to the file.

If you rename the ascii-file to *.qin, you can easily select the file from the GUI (go to the Length parameter files, click the Edit data button at the bottom, in the next dialogue, under properties-details, select scalar field. The goto data-import, file type Quickin file (3D), and import...)

Michelle