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

Steep slope from deep water to coastline

Hanieh Mohamadi Moghadam, modified 1 Year ago.

Steep slope from deep water to coastline

Youngling Posts: 4 Join Date: 8/20/17 Recent Posts
Dear Delft3D users,

I want to model hydro+wave with a slope of 27 percent from deep water to the coastline. I use Domain Decomposition technique with an 300mX500m rectangular domain and 2mx2m grid size as outside domain and an 98mX200m rectangular domain and 0.5x0.5m grid size as inside domain. With this spatial resolution, I tried different time step ranging from 0.2 min to 0.02min, however I keep receiving "Water level change too high" error. I assume there must be something wrong with the courrant number, but I don't know how to fix it.
I know the slope is very steep and I was wondering if anybody has similar problem.
The boundary con. is Water Level for the offshore side and Neumann for the lateral sides and nothing (open boundary) for the coastline.
I really appreciate if you give me your advice on how to fix this error.