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. 




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



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Running Delwaq in a batch/ initial conditions file

Ben Williams, modified 7 Years ago.

Running Delwaq in a batch/ initial conditions file

Jedi Knight Posts: 114 Join Date: 3/23/11 Recent Posts

I have a water quality simulation that I am trying to calibrate. This requires many, many runs whilst varying a few select parameters. Part of this are maps read in and used as initial starting conditions (for example, distribution of IM1, IM2, IM3 through the water column, and maps of the mass available mass of IM1, IM2 and IM3 in Layer S1).

There are two ways to run Delwaq:

1) Through the GUI, saving the .scn file which then makes a few other files (such as the .par etc). You then run Delwaq1 and Delwaq2 through the GUI and away you go.

2) By altering the link to the map files within the .scn file using a text editor (or even as part of a wider batch system) and then using a DOS batch file to kick off the model through Delwaq1 and Delwaq2. This is very convenient and allows at least partial automation.

However, I am finding that when I use method (2), I am not getting any changes in the maps imported in to the WAQ simulation. For example, if I multiply the mass available within each cell for Layer S1 in the maps by some number, this change does not seem to be incorporated in to the model when I examine the results files.

But if I open up the .scn file in the GUI, and then SAVE the scn file and subsequently kick off the simulation, the amount of mass available in the simulation does reflect the changes I made to the maps.

So, my question is:

How can I make a change to the .scn or .inp file using a text editor, and then have those initial starting conditions updated in the .par or .ini (which seem to be play some part in this) without having to resort to using the GU?