Modelling Rivers


Rivers are natural water courses. They have vital contributions to the social and economical welfare of societies living along their course. They provide continuous, usually dependable, flow and supply of water. Accordingly, centralised civilisation began emerging independently along number of river valleys; e.g. the Nile, Tigris and Euphrates, the Indus and the Yellow Rivers. Since then, mankind has been in continuous struggle to understand and live in harmony with this gift/force of nature. Modelling rivers is the modern way to understand their behaviour and is an essential tool to tackle several river problems.

Delft3D is the state-of-the-art modelling framework for hydrodynamics, water quality, ecology, waves and morphology.
Here, in this space, we share knowledge & experiences, and discuss issues related to modelling of rivers.





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