First, erosion resulting from excessive deforestation in the upper reaches of the river. And second, heavy silting which raised the riverbed in the main channel.

第一，过度砍伐引起的河流上游的侵蚀，第二，严重的泥沙淤积抬高了主干道的河床。

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First, erosion resulting from excessive deforestation in the upper reaches of the river. And second, heavy silting which raised the riverbed in the main channel.

第一，过度砍伐引起的河流上游的侵蚀，第二，严重的泥沙淤积抬高了主干道的河床。

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