RESTRAINING EFFECTS OF SAND DEPOSITION BY SHIELDING OF ENTRANCE IN AN ARTIFICIAL EMBAYMENT

Abstract

The effects of entrance barriers along an embayment mouse were investigated in order to contain sand deposition in an embayment zone. The velocity and sand deposition were measured in an open channel with a trapezoidal embayment. The entrance shielding methods were changed in length, height and location in a systematic way. Both bed load and suspended load were considered in the present experiments. As a result, typical flow structures were made clear and the restraining effect of sand deposition was observed by control of entrance configuration. The amount of sand deposition decreased in proportion to the shield factor. However, it was noticed that the configuration of sand deposition was varied by the location of barrier. The velocity strength in an embayment is also correlated to the volume of sand deposition.