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

Spatially Varying Reactions

Deon Knights, modified 2 Years ago.

Spatially Varying Reactions

Youngling Posts: 2 Join Date: 3/15/18 Recent Posts
Hello, I am new to Delft. I am developing a model to simulate contaminant removal in an estuary. I have been able to model a homogeneous situation where reaction rates are uniform over the entire domain. Now, I would like specify particular zones in my model where reaction rates are unique. The user manual states that I can use QUICKIN "for preparing and manipulating grid oriented data such as initial conditions or spatially varying process parameters or forcing functions" I have been trying to figure out how to apply this in QUICKIN with no luck. There is a section in the QUICKIN user manual that states "QUICKIN can be applied to specify any spatially varying parameter, which may also be some initial condition or some spatially varying input parameter" However, neither the DWAQ nor the QUICKIN manual explicitly states how to do this. Am I on the right track with approaching this problem? I have considered using Trachytopes for this but that does not get me what I need.

Arjen Markus, modified 2 Years ago.

RE: Spatially Varying Reactions (Answer)

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts
In DELWAQ process parameters can have any of the following characteristics:
  • A constant - the same value in space and time
  • A parameter - constant in time but varying over the model area
  • A function of time - constant over the model area
  • A segment function - varying over the model area as well as time

What you are after is a "parameter". If you use the old user-interface, see Sections 5.3.6 and 5.3.8 of the user manual - in the screens this is called a "scalar field". If you are using the new (DeltaShell) user-interface, then see section 4.8.2 in the "D-Water Quality User Manual". The term to look for is "Coverage"