固定床及び移動床水路における貯水池決壊段波の流下過程

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書誌事項

タイトル別名
  • DAM-BREAK FLOOD WAVE PROPAGATION IN RIGID AND MOVABLE BED FLUMES
  • コテイショウ オヨビ イドウショウ スイロ ニ オケル チョスイチ ケッカイ

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抄録

Behavior of a flood wave caused by the instantaneous and complete collapse ofa storage dam is examined by using prismatic channels with smooth and roughrigid beds, and with movable bed. The wave propagation in reservoirs is also dealtwith. Equations of gradually varied unsteady flow and of movable bed variationwith bed load are employed, and solved by the MacCormack numerical scheme.The computed results for the rigid bed agreed qualitatively with theexperimental ones regarding the effects of the initial storage depth, channel bedslope and bed roughness on the stage and velocity hydrographs. Modification of thebed roughness coefficient, however, would be needed to simulate accurately thewhole process of wave-front advance and height attenuation. The computationaland experimental results of stage hydrographs in the reservoirs coincided with eachother for the downstream advance waves, but for the upstream ones, which havethe smaller initial wave-height and propagate with the lower speed. Dam-breakflows on the movable bed have a steep wave front, and their wave-height does notdiminish monotonically, occasionally increasing in the cases of steep bed slope. Thecomputed results of bed profile were similar to the experimental ones, but the localscour in the upstream reach was underestimated.

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