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

Hot Start problem in DELWAQ

YK
Yahia Kala, modified 5 Years ago.

Hot Start problem in DELWAQ

Youngling Posts: 12 Join Date: 7/11/13 Recent Posts
Hi,

I have set up a DELWAQ run using the last time step of my previous run as the initial conditions for the new run. To do this, I am going through the GUI and specifying each relevant substance as a scalar field which is imported from a [oldrunname]_res.map file. I have two questions:

1. When I do this for a few parameters, I can see the difference in the [newrunname].scn file where some parameters are imported from the map file and some are not. However, the initial conditions section of the [newrunname].inp file (eighth block) only specifies the associated binary file [newrunname].res for the initial conditions. This leads me to believe that all of the initial conditions, whether they are imported scalar fields or constant values, are written to the [newrunname].res file when the [newrunname].scn file is saved through the GUI. This is then read by the .inp file at the beginning of the simulation. Is this true?

2. Whatever gets written to this [newrunname].res file is not consistent with the last time step of my model run. Attached is a screenshot of the actual thickness of S1 at the end of the old simulation and then at the beginning of the hot start simulation. It is three orders of magnitude too small. My first thought is that this could be a problem with unit conversion, but I am using the same version of D3D to run both simulations. Is there a way that I can manually specify some parameters in the [newrunname].inp file while still using the [newrunname].res file for the other parameters?

Thanks,
Yahia Kala