VERTICAL MIXING IN STRATIFIED FLOW OVER ARTIFICIAL MOUND REEF

Abstract

 Laboratory experiment and numerical simulation were carried out to grasp the vertical mixing with the artificial mound reef in stratified flow with the thermocline. It was revealed that the structure of stratified flow with the thermocline depended on densimetric Froude number F_r by the laboratory experiment results, and it was similar to past knowledge. Under conditions of F_r<1, internal waves were generated and mixing occurred in a thermocline over the artificial mound reef or on the downstream side. Under conditions of F_r>1, the internal wave was not generated, but mixing produced in a thermocline on the downstream side of the artificial mound reef was observed. The laboratory results were compared with results by three-dimensional LES numerical simulation. It was confirmed that the numerical simulation could successfully reproduce the laboratory results.