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



Message Boards

Wavecon file for FLOW-WAVE online coupling

Gabriel Lim, modified 1 Year ago.

Wavecon file for FLOW-WAVE online coupling

Padawan Posts: 37 Join Date: 5/5/18 Recent Posts
I want to include representative values for waves and wind for an online coupled FLOW-WAVE simulation. I am using the wavecon file to specify the my representative time series of wave forcing. My question is regarding whether or not I need to include the representative wind values and also the water level in the wavecon file as well as in the FLOW GUI??
I have already input all the wind time series into the "physical parameters" tab of the FLOW GUI, and specified in the Grids->Hydrodynamics tab: "Use and Extend" for the water level and "Use but do not extend" for the wind data. My problem is however in the WAVE user manual, it says in Appendix A.2.8.1:

"To use this Wavecon option, just simply add the <wavecon.rid> file to the working directory and the system will use the file automatically. A WAVE computation is always performed on a certain time point (based on the reference date). If a <wavecon.rid> file exists in the working directory, it will get its wave boundary
conditions (including wind and water level) from that file
. The boundary condition values in the default <rid.mdw> file will not be used then. When the time point of the wave computation lies between two prescribed time points in the <wavecon.rid> file, it will interpolate the wave, wind and water level conditions between these two time points."

So I am unsure if I need to include the water level and wind data in the WAVE GUI wavecon file again, or if it is sufficient to leave it in the FLOW GUI and simply set these parameters as zero in the wavecon file. Any help would be much appreciated! Thank you!

Kind regards,

Connor Broaddus, modified 1 Year ago.

RE: Wavecon file for FLOW-WAVE online coupling

Youngling Posts: 1 Join Date: 9/9/19 Recent Posts
Hi Gabriel,Did you ever find a solution to your question? I have a similar question regarding water levels, as I am running a coupled simulation that includes harmonic changes in water levels at the boundaries of the flow domain. It would be much easier if I could extend those water levels to the wave domain rather than having to specify them in the wavecon file (which requires calculating them). Please let me know if you solved your problem (or if anyone else has an answer please let me know). 
John McDowell, modified 5 Months ago.

RE: Wavecon file for FLOW-WAVE online coupling

Youngling Posts: 14 Join Date: 9/6/17 Recent Posts
Hi Gabriel, Connor, Alex,

I believe I'm having a similiar issue with a coupled FLOW & WAVE model with spatially constant but temporally varying wind. Standalone, both models work fine, but I drive the WAVE model with a wavecon file, and the FLOW model with astronomically forced water levels at the boundary, and the standard .wnd file for the wind.

Did you ever discover whether it was possible to set the water level/wind parameters to zero in the wavecon file? And have the rest of the simulation driven by the FLOW/WAVE files setup - ie with the "FlowBedLevel" flags?