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Hello-

I'm trying to determine the total suspended sediment flux across a boundary at several locations, however I'm not clear if it is appropriate for me to multiply the sediment flux (m2/sec) by the depth, or if I should be using the width of the element to obtain a volume (m3/sec)?

I tried a test at the input model boundary using the depths, and the total volume is slightly greater than the defined influx at the boundary.

Could someone please clarify for me how to go from the unit sediment flux values to volume sediment flux?

Thanks!
Nina

Hi Nina,

The sediment fluxes (in m2/s) are per unit width. You will have to integrate over the boundary.
In it's simplest form this would be the sum of the flux at every nodes times half the width of both element at the boundary that contain that node.

A slightly better approximation would be to take the linear interpolation of the boundary nodes. This would be in agreement with the calculations and assumpttions in Sisyphe.


The fluxes are propably easiest calculated using BLUE-KENUE or the matlab tool, that are available through the graphical interfaces download area.

Hope this helps,

Michiel