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

Dwaq error

carlos` g zapata, modified 2 Years ago.

Dwaq error

Youngling Posts: 1 Join Date: 12/23/18 Recent Posts

I am working with Dissolved Oxygen model in a big estuary. After running Delwaq2 afther the first step I got ERROR in GMRES           1
 Stopped with error code :           1. I' ve changed the time step from 30 seg to 20 , 10 ,1. The problem still go on. I have attached the in, lst and lst file.


Could you help me to fix this problem.

Arjen Markus, modified 2 Years ago.

RE: Dwaq error

Jedi Knight Posts: 223 Join Date: 1/26/11 Recent Posts

This is not the best time of year to expect answers fast, given the holiday season. One thing you can try is to set the constants Tolerance or MaxIter to different values:

CONSTANTS Tolerance DATA 1.0e-6


You can set them independently of each other. The first is the tolerance for stopping the iteration process - a larger value means the iteration will finish sooner with a possibly larger residual error, but there ought to be no significant effect on the concentrations. The second is the number of iterations that can be taken before the iteration process is terminated (and the whole calculation is terminated as well, because of lack of convergence).