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|標題:||Flume Experiment of Alluvial Fan at the Confluence by Debris Flow|
In this study, we use two experimental flumes to simulate the forming process of alluvial fans which were formed by debris flow at the confluence in mountain region. There are three discharge, six slopes for main flume and three debris flow concentrations for tributary flume in experimental flume I. In experimental flume II, there are three discharge for main flume, and three debris flow concentrations for tributary flume. The confluence angles of two experimental flumes are 90 degrees. The process that the sediments flow into the confluence can divide into two parts: first, the sediments diffusion, and second, sediments deposition and pushing expansion. In the process of sediment diffusion, we can differentiate the forms of diffusion by the sediments diffusion Froude number. In the process of sediments deposition and pushing expansion, the form of alluvial fans can divide into four parts: no alluvial fan, transitional alluvial fan, slight retrogressive depositing alluvial fan, and heavy retrogressive depositing alluvial fan. The ratio between mass of sediments that transport in main flume and mass of sediments that supply in the tributary is used to differentiate the form of the alluvial fans. We discuss the delay of retrogressive depositing, the factors of alluvial fan form by volume and by length in our study. We also offer a formula which explains how the flow in main river and tributary to influence the ratio in length and width of the alluvial fan.
|Appears in Collections:||水土保持學系|
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