| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 94 === The Morning-Glory spillway is a kind of structure for flood expellent of the reservoir. In general, the free overflow is the main flow condition of the spillway. Consequently, the free flow over the spillway is well understood, but knowledge about submerged flow is generally relatively poor. However, the greenhouse effect cause unusual climate, and therefore change the basin runoff. So, may cause the spillway’s flow condition became submerged flow. In order to ensure the spillway is under the safe draining water condition, understanding various stage of the spillway is necessity. In this study we use commercial computation hydromechanics software to simulate the behavior of flow over a acrylic Morning-Glory spillway model in the laboratory. The results display flow over the spillway free overflow is better than submerged flow, and the antivortex board can reduce the vortex influence on spillway especially in submerged flow.
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