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

Bottom roughness(manning) and viscosity/diffusity

Norlan Baga, modified 5 Years ago.

Bottom roughness(manning) and viscosity/diffusity

Youngling Posts: 10 Join Date: 1/18/14 Recent Posts
Good day!

I want to ask the effect of the bottom roughness and viscosity/diffusity during a simulation? I'm currently using DELFT3D on my undergraduate study about computational analysis of historical storm surge along Manila Bay (Philippines). Since I can't find any data about the bottom roughness of the bay, I'm only using uniform data (u and v) of the manning's equation. Before running all the historical typhoons that pass through the bay, I need to calibrate my model's physical parameters by running a series of simulations with varying constants(uniform) used to the said parameters then comparing the results to the reported storm surge height during a specific typhoon. I just thought that by understanding the effects of these constants to the model, I may come up with a better (realistic) model to be used on my study.

Thank you very much!


Norlan Baga
Qinghua Ye, modified 5 Years ago.

RE: Bottom roughness(manning) and viscosity/diffusity (Answer)

Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent Posts
Hi Norlan,

You need calibration and/or sensitivity tests to determine the parameters of your model.