Bridge in 2D Area with Full Momentum

[Scott Miller]

I am working with a model that has bridges in a 2D flow area. The bridge I am interested in crosses a stream at an angle. The bridge piers are offset, upstream to downstream, to match this angle. The bridge physically directs water toward the right bank as the stream meanders left.

To my understanding, modeled flow under the bridge is just a function of headwater and tailwater. Is the modeled direction of flow – its momentum – preserved, or does the flow simply fill the corresponding cell on the downstream side of the bridge?

[Luis Partida]

Hey Scott, this is truly a great read and was well written by HEC to help best understand bridges in 2D modeling and what RAS is doing behind the scenes. I would give this a read.

https://www.hec.usace.army.mil/confluence/rasdocs/r2dum/latest/development-of-a-2d-or-combined-1d-2d-model/modeling-bridges-inside-2d-flow-areas

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