LEVEE OVERFLOW SIMULATION BY MODIFIED BOUSSINESQ-TYPE EQUATIONS

Abstract

 The non-hydrostatic pressure needs to be taken into account in depth-integrated modeling of levee overflows especially with a large overflow depth. A possible approach may be to employ the Boussinesq-type equations as model equations. However, conventional Boussinesq-type models tend to be unstable around the levee crest by oscilations introduced by the high-order terms when applied to overflow simulations. In order to enhance the model stability, we enhance the Boussinesq-type equations by adding a modification term with a free parameter. We investigate how the modification term affects model stability and accuracy and specify a possible range of the modification parameter through comparions of model results with experimental data