本研究利用小尺度的三維動床水槽，探討水下辮狀河道受寬度限制與水砂比差異之形貌演化發展，也是首次對於水下辮狀河道進行寬度差異分析比較的實驗。從研究的結果顯示，寬度效應與水砂比差異均是左右水下辮狀河道發展的變因之一，但也發現兩者似乎分別從不同的角度切入去影響水下辮狀河道的演化與發展。從定性的觀察中發現，寬度效應主導了水下辮狀河道的演化機制，而水砂比差異則影響水下辮狀形貌的發展程度，且在寬度效應與水砂比差異的共同影響下，寬度效應對於水下辮狀河道整體的形貌發展有更顯著的影響力。此外，在許多定量分析的結果均表示，水下辮狀河道與陸上辮狀河道間存在相似的趨勢，再次確定水下辮狀河道與陸上辮狀河道的相似性。

最後，對於在實驗室中無法取得並量測的水下異重流流量，本研究透過對無限方向演算法進行修正並結合Topo Toolbox進行水流累積模擬，除了可以模擬異重流於當下數值高程模型中的流路外，也能透過加總任一橫斷面上的流量，取得異重流的流量資料，但仍缺乏全域實際流量分布之資料佐證。

In this study, we used small-scaled physical model to observe the evolution of the submarine braided channel morphology that is limited by the initial channel width and inflow to sediment ratio. It is also the first experiment to compare the difference of the submarine braided channel width. The results show that all of the difference channel width and inflow to sediment ratio affect the development of submarine braided channel in different ways.

From the quantitative results, we found that the channel width dominates the evolution of the submarine braided channel, and the inflow to sediment ratio affects the development of the submarine braided channel morphology. Under the common influence of channel width and inflow to sediment ratio, the channel width has a more significant influence on the overall development of the submarine braided channel.

In addition, the results of quantitative analysis indicate that there are similarity between submarine braided channel and braided channel, so we can compare the similarity between them.

Finally, we modified the flow algorithm and combined it with Topo Toolbox to simulate the flow path of density currents and predict the discharge in any cross section, but there is still lack of evidence for the actual flow distribution in the whole area.

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