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標題: Flume Experiment of Mountain Step-Pools Streams
作者: Tsou, Ching-Ying
關鍵字: step-pool;階梯-深潭;mountain streams;channel stability;山區河流;河床穩定
出版社: 水土保持學系
Step-pools are fundamental components of channel morphology in mountain streams. Knowing the formation of step-pools will contribute to increasing the understanding of mountain streams morphology. Because of attention to river restoration more bio-engineering structures such as step-pools are adopted. But the mechanisms of river flow are complicated, in-stream structures can never be built directly. Bio-engineering structures should based on the river morphology. It is important to understand the formation process of step-pools.
The formation process of step-pools under the conditions of sediment mixtures, different discharges, channel bed slopes(2-7) are studied experimentally in laboratory. On this basis, the mechanisms of step-pools are further investigated. We find some results as follows, many varied step-pools forms are observed which develop in conditions where the largest floods are just capable of transporting the largest debris. Those will tend to form steps acting as keystones retaining smaller debris. Eight types of steps are classified according to arrangement of sediments in this research. Dimensional analysis and the index namely Wsp coefficient is proposed to evaluate the relation between the formation of step-pools and the variation of sediment discharge. The expression is established according to the experimental data which can illustrate the step-pools as adjust their profile vertically, increase the channel-bed roughness and decrease the channel slope to minimize the time rate of expenditure of potential energy. These have effect on decreasing the sediment discharge of stream flow and stabilization of the channel-bed.

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