當洪水位超過主深槽岸頂，而溢流於洪水平原形成複式斷面河槽時，深槽岸頂以下的「深槽內流量」，則影響深槽之安定。本研究建立三維分層模式，模擬二階直線深槽複式斷面河槽，分析其深槽流量特性。由本研究之模擬案例之結果分析，深槽內流量將隨斷面福祿數增加而增加。但斷面流量改變1.24倍，深槽內流量只改變0.21倍，且接近滿岸流量。因此水位超過深槽岸頂後，深槽內流量的改變小，亦即滿岸以下之深槽流量將影響深槽安定。

When the flood surpasses the main channel and forms the compound channel on the flood plain, the discharge of the main channel affects the stable of it. This study is to establish a three-dimensional averaged-model, utilizing this model to simulate a two-stage compound channel and analyzes the features of the dominant discharge. The results from the simulated case showed that discharge of the main channel will increase as well as the average Froude number does. However, when the total discharge increases to 1.24 times, the main channel flow only raises to 0.21 times and closes to the bankfull discharge. Consequently, once the water level exceeds the main channel, the discharge of the main channel changes less, which means the main channel flow will affect the stable of the main channel.

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