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一、黄河现状极不稳定黄河为害的原因除了它的洪水外还有它的泥沙。它历求以善淤善决著名,在郑州以下的大平原里黄河改道的次数很多,它的出海口极北曾达天津极南曾达阜宁。它在平原里的河槽都是掠夺而来,占据的时间长短不一,就最近两次大改道而言,上一次在宋代(1194年)它把淮河故道占为己有,占用时间达661年,在占用的时间里,海口外移70公里,因为需要维持泄水所需的临界坡度,以致平原里的河槽和洪水位都逐
First, the status of the Yellow River is extremely unstable Yellow River damage in addition to its flood but also its sediment. It is famous for its good ruthlessness. It is known that there are many diversions of the Yellow River in the Great Plains below Zhengzhou, and its sea reaches the extreme south of Tianjin reaching Funing. It took plumes from the troughs in the plains and took up varying lengths of time. As of the last two major road diversions, the last time it occupied the old Huaihe River in the Song Dynasty (1194), it occupied 661 years During the occupation time, Haikou relocated 70 kilometers due to the need to maintain the critical slope required for flood discharge so that the floodplains and floodplains in the plain were