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

RE: Outflow boundaries in one reservoir. Doubts with the outflow definition

Ricardo Roman-Botero, modified 1 Year ago.

Outflow boundaries in one reservoir. Doubts with the outflow definition

Youngling Posts: 5 Join Date: 8/2/17 Recent Posts


I want to simulate the thermal structure of a very simple reservoir which has one flow input and one output. I am working with z-layer model. I also want to know the behavior of some tracers. The outflow Is located in the dam wall near the bottom. For me it is very important to know the temperature in the outlet and, also, the tracer concentration. As I can understand there are two options which I can use to define the outflows, but I have some doubts. The options are:

1. Using the option “Operation-Discharge”, defining a negative discharge and a location near the bottom ( K = 1 or 2, etc.).
2. Defining a Boundary, by setting up “Discharge per Cell” –> “Time series” -> “Per layer specified” -> and then I define the negative discharge in the specific layer (K).

- In both cases, however, (if I understood) I must define the outflow temperature and the tracer concentration too, but this is basically part of I want to know. If I define one value, I think D3D is going to use it as a Dirichlet condition but I don’t want to impose the concentration and the temperature, so what am I missing here? how should I proceed?  

- which is the much better option to define the outflow, the option “a” or “b”?

Thank you in advance

Ricardo RB


eliot clake, modified 1 Month ago.

RE: Outflow boundaries in one reservoir. Doubts with the outflow definition

Youngling Posts: 7 Join Date: 10/27/19 Recent Posts