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

How is momentum treated with culverts?

Nejc Coz, modified 4 Years ago.

How is momentum treated with culverts?

Youngling Posts: 2 Join Date: 10/12/15 Recent Posts

I am using modified culverts to represent the tidal turbines (discharge prescribed with a "Hill chart") in a tidal lagoon. The lagoon is enclosed with thin walls and the intake and outlet of a culvert are in the adjacent cells, one on each side of a thin dam. I am worried about how momentum is assigned at the discharge from the culvert.

In the manual it says that for discharges: "The momentum released to the flow due to a discharge is distributed over the velocity points that bound the quadrant in which the discharge is released." But my understanding is that only the Type=momentum discharge has the functionality where user can specify the direction and magnitude of out-coming velocity.

So how is the momentum then treated with culverts? It doesn't say anywhere in the manual. All I could find is that culverts are considered a special form of in-out discharge

Does anyone know where in the source code the discharges are added to the momentum terms, so I could potentially prescribe the direction manually? I did some investigation myself, however the source code can be quit hard to follow.

Any help will be much appreciated emoticon

Regards, Nejc