Physical Modeling of Flow Behavior on Stepped Spillway Case Study: Mae Suai Dam in Chiang Rai

Abstract

            Dam construction for decreasing flood have to consider the size of reservoir and location of the dam. The size of the reservoir should have enough capacity to store a large amount of water. Limitation of a store the amount of water in the reservoir is controlled for the safety of the structure. If there are too much of amount of water, it is drained by using spillway that the high energy dissipation occurs along with the drainage large amount of water and then, the erosion on the spillway. The aim of this study is to observe the differences between the results from the numerical model simulation and the physical model test. The less difference of results will assure that the numerical model simulation results are reliable and can be used to design the prototype.

            The velocity, energy dissipation, and flow behavior on stepped spillways from the physical model will be compared with the numerical models. The percent of energy dissipation of up to 99 % was found. The percentage of difference in velocity from physical and numerical models are around 2 -4 %.