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

Estuary - locally high values of modelled constituents

Dmitry Kushnir, modified 6 Years ago.

Estuary - locally high values of modelled constituents

Jedi Knight Posts: 102 Join Date: 11/9/12 Recent Posts
Hi all,

During the simulation a zone with unrealistically high values of constituents in the upper layers appeared (attached). Z-model was used (trunk, version This area is subject to intense drying-flooding processes. Could you possibly give me an advice regarding the cause of this local abnornality and any workarounds to avoid it?
Thanks in advance,
Qinghua Ye, modified 6 Years ago.

RE: Estuary - locally high values of modelled constituents (Answer)

Jedi Council Member Posts: 612 Join Date: 3/2/11 Recent Posts
Hi Dmitry,

I would say it might happen with z-model. Do you have a heat flux / evaporation on in your model?

The z-model function is not offically support in Delft3D yet.

Let me try to explain. It happens that when a wet cell changed to be dry in the top layer, the constituents are not properly transport to the cells next to it, and there are a small amount of water stays in the cell, thus the constituents density in the upper layers might be very high. Maybe you can try to adjust a bit the layer distribution.