Influence of the Outflow Boundary Conditions in the Open Channel and Shallow Water Models

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Abstract

Boundary conditions can have an important effect on the simulation results. Inappropriate use of boundary conditions can significantly distort the results, which could in case of open channel and shallow water models lead to seriously over or under-estimated water levels and flooded areas. As it is always necessary to choose the appropriate boundary condition type, it is sometimes also very important to have them sufficiently distant from the domain areas of specific interest. This means the computational domain sometimes needs to be larger than the physical domain, so the modeler could be assured that no possible specific boundary-condition-based effects would alter the result at the domain area of interest. The outflow boundary conditions used for the survey presented in this paper were discharge - water depth dependency function for 1D open channel model and nonreflecting (transmissive) boundary condition

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