泥石流与主河汇流造成的灾害严重而且机理复杂。
When debris flows converge into river, serious hazards and complex mechanisms will be caused.
当支沟泥石流输入主河的泥沙量小于主河的输沙量时，主河河床将下切，并逐渐恢复山区性河流的特征。
The main channel bed will scour if sediment amount from tributary debris is less than that the main stream can carry and the river evolution exhibits the characteristic of mountainous rivers.
昨天密西西比河洪水到达维克斯堡的水位超出警戒水位14.1英尺，但是并没有损坏主堤，也没有淹没整个城市。
The Mississippi River crested at Vicksburg yesterday at a record high of 14.1 feet above flood stage, but did not breach the main levee or inundate the city.
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