| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 97 === The experimentation of dam removal effect on bed form variations is simulated under the conditions of sediment mixtures, different discharges and channel bed slopes. Some types of dams are such as check dam、slit dam、grid dam 、A-type dam、R-type dam and multiple. It is discussed the relationship among the removal of different dams and sediment discharge、sediment deposited and the ways of removing. According to this experiment, after removing the dams, the amount of sediment discharge is affected not only because of of the opening depth but also due to the armor-layer which is caused by the bed after being scour. Moreover, it is found that when the dam removals are being processed, if the time of dam removal is extended, the sediment exported separately so that it reduce the sediment discharge in the time unit to avoid the situation of large amount of sediment discharge at the same time. Finally, the changes of cross sections became the situation of headcutting which means the scouring rang extend with increasing opening depth.
Currently, the setups of steel dams are based on the former calculation such as sliding and toppling but lacking the sustainable examination of the structure of steels. Therefore, in this essay, it is referred to the ways of examinations, which includes Slenderness Ratio, Axial Stress, Bending Stress, Combined Stress and Sheer Stress, of the steel structure of the steel dams. The examination of steel structure will be passed after calculating via MIDAS GEN under the condition of the result meeting the demand of regulations of the designing techniques of steel structure buildings.
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