A series of hydraulic model tests with horizontal movable seabed under regular wave actions have been carried out to investigate the dynamic interactions between water waves and seabed soil. Seabed dynamic stresses fr...A series of hydraulic model tests with horizontal movable seabed under regular wave actions have been carried out to investigate the dynamic interactions between water waves and seabed soil. Seabed dynamic stresses from experiments are, tound to differ from theoretical resuhs. The response of p0 in permeable seabed has a small decay and phase shift to the nonlinear wave actions, and the dynamic stresses, σs/p0, σh/p0 and u/p0, contain different phase shift characteristics. Such phenomena will strongly affect the dynamic stress path in seabed. If the phase shifts of σs. and σh are neglected, the stress path will become a straight line; otherwise, it will become an elliptical curve. In phase shift cases, the long axis of the p - q diagram will be shortened when the depth increases, and the short axis will become longer when the phase shift increases. For the p＇ - q＇ diagram, the larger the phase lag of u, the longer the short axis. Relative results offer useful information for the analysis of seabed stability.展开更多
The labyrinth weir is a non-gate controlled discharge structure which has a broken-line overflow weir on surface to get longer length of overflow frontier,and has advantages of simple structure,larger discharge and co...The labyrinth weir is a non-gate controlled discharge structure which has a broken-line overflow weir on surface to get longer length of overflow frontier,and has advantages of simple structure,larger discharge and convenient operation,and so on.It's mainly used in spillway of medium and small reservoirs with advantage of improving the discharge capacity for both newly built spillway and reconstruction one.Based on the design of Anzihe reservoir,the paper preliminary explores the water flow regime,discharge capacity and hydraulic design of the labyrinth weir.The result of calculation and test is the discharge capacity of labyrinth is greater than the broad crest weir and practical weir under the same water head and more superiority under the lower water head.展开更多
基金This research was financially supported by the National Science Council , Taiwan under the project entitled"TheStudy of the Dynamic Behavior of Foundation Soil beneath Nearshore structures under Wave Loading Action (I)"withthe project number of NSC-91-2211-E-019-013
文摘A series of hydraulic model tests with horizontal movable seabed under regular wave actions have been carried out to investigate the dynamic interactions between water waves and seabed soil. Seabed dynamic stresses from experiments are, tound to differ from theoretical resuhs. The response of p0 in permeable seabed has a small decay and phase shift to the nonlinear wave actions, and the dynamic stresses, σs/p0, σh/p0 and u/p0, contain different phase shift characteristics. Such phenomena will strongly affect the dynamic stress path in seabed. If the phase shifts of σs. and σh are neglected, the stress path will become a straight line; otherwise, it will become an elliptical curve. In phase shift cases, the long axis of the p - q diagram will be shortened when the depth increases, and the short axis will become longer when the phase shift increases. For the p＇ - q＇ diagram, the larger the phase lag of u, the longer the short axis. Relative results offer useful information for the analysis of seabed stability.
文摘The labyrinth weir is a non-gate controlled discharge structure which has a broken-line overflow weir on surface to get longer length of overflow frontier,and has advantages of simple structure,larger discharge and convenient operation,and so on.It's mainly used in spillway of medium and small reservoirs with advantage of improving the discharge capacity for both newly built spillway and reconstruction one.Based on the design of Anzihe reservoir,the paper preliminary explores the water flow regime,discharge capacity and hydraulic design of the labyrinth weir.The result of calculation and test is the discharge capacity of labyrinth is greater than the broad crest weir and practical weir under the same water head and more superiority under the lower water head.
