Adding a “pool” at the end of an channel

[Anonymous]

Hi

I’m trying to model a pool at the end of an inclined channel with the purpose of investigating how fast the flow comes to ease.

The pool will have its bottom placed lower than the outflow from the channel and it will be somewhat wider than the channel. The water will flow out of the pool through a V-shaped weir placed on the opposite side of the pool from the channel.

How do I model the drop from the channel to the pool? I have thought about using a inline weir to simulate the drop. The problem, as I see it, is that modelling this way won’t take into consideration any “damping” effect from the water inn the pool, which is the whole reason for establishing the pool.

I have therefore tried to insert a “Storage Area” but I’m unsure how to define it right. Hope you can help.

[dueckrandy]

Andreas,

If I understand your question correctly, your goal is to determine the velocity in a pool which dissipates energy downstream of a fast-flowing channel. If that is the case, I don’t think modeling a storage area will benefit you. I think you are on the right track with an inline structure to model the drop. As long as you have adequately spaced cross sections to model the transition between channel and pool, I think you will achieve your goal. If the drop is not large enough to behave like a waterfall or plunge pool (ie. 100% kinetic energy dissipation), then you may need to place ineffective flow areas on the cross sections downstream of the drop.

[Author]

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