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. 
 

** PLEASE TAG YOUR POST! **

 

 

Sub groups
D-Flow Flexible Mesh
DELWAQ
Cohesive sediments & muddy systems

 

 

Message Boards

confusing paragraph on Page 59 of the D-Water Quality User Manual

ZW
Zhanxian Wang, modified 2 Years ago.

confusing paragraph on Page 59 of the D-Water Quality User Manual

Padawan Posts: 35 Join Date: 4/11/12 Recent Posts
In the D-Water Quality User Manual Page 59 about using the hydrodynamic result (Delft3D), section 5.2:

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Method 1: the builtin coupling

The builtin coupling is the preferred mode of coupling Delft3D-FLOW to D-Water Quality.
With this mode the required input files with the grid layout and the hydrodynamic results are
written directly and therefore a separate coupling step is not needed anymore. There is one
drawback: you have to decide at the start of the hydrodynamic calculation how to aggregate in
time and space (both horizontally and vertically). The other method allows you to store the full
result of the hydrodynamic calculation in so-called communication files and do the coupling
afterwards.

This method can also be used for ’classic’ domain decomposition Delft3D-FLOW calculations
with multiple grids, and for automatic parallel calculations of Delft3D-FLOW.


The builtin coupling is enabled in Delft3D-FLOW via the user-interface using the Export WAQ
input checkbox and the Edit WAQ input button.

This method can also be used for ’classic’ domain decomposition Delft3D-FLOW calculations
with multiple grids, but doesn’t work for automatic parallel calculations of Delft3D-FLOW.
The
output should encompass a representative period with a sufficient time resolution. Examples
of a representative period are a single tide and a spring-neap cycle.
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The statements are self-contradicting each other.

Jonathan
AM
Arjen Markus, modified 2 Years ago.

RE: confusing paragraph on Page 59 of the D-Water Quality User Manual

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
You are absolutely right - we will correct it, but the problem now is: which is the right text?
AM
Arjen Markus, modified 2 Years ago.

RE: confusing paragraph on Page 59 of the D-Water Quality User Manual

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
I know now why this negative remark was introduced: when this automatic domain decomposition was first introduced, the corresponding ddb files were not produced along with it. That made it very hard to reconstruct the original grid as necessary for DELWAQ.

I can now correct the text.