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

Mean Value in Harmonic Forcing

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Anisul Haque, modified 7 Years ago.

Mean Value in Harmonic Forcing

I want to specify tidal boundary using Harmonic Forcing.

How can I give the mean value ? In the manual. it is mentioned:

"The mean value is speci ed by zero frequency and zero phase. The mean value must always be speci ed."

How can I specify the mean value ? It is important, otherwise the harmonic forcing generates a boundary with arbitrary mean value, i.e., datum
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Arnold van Rooijen, modified 7 Years ago.

RE: Mean Value in Harmonic Forcing (Answer)

Hi Anisul,

The mean value should be specified as one of the lines in your harmonics boundary file. So in principal your first line would always be a value for the amplitude (which is your mean value), and then put zeros for the frequency and phase (frequency = 0 means mean value). I think mostly people relate their vertical datum to MSL so then you can add a line just with zeros (also for the amplitude).

Hope this helps.

Cheers,
Arnold