Flood Disaster of the Changjiang River in 1998

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  • 1998年中国長江の洪水災害について
  • 1998ネン チュウゴクチョウコウ ノ コウズイ サイガイ ニ ツイテ

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Abstract

A great flood occurred at the Changjiang River, China in July and August, 1998. The primary cause of the flood is an extraordinary heavy rainfall brought by the subtropical high which moved along the Changjiang River. Owing to the rainfall, a flood runoff at the upstream fell on the runoff at the downstream, resulting in the great flood of a long duration. The decrease of water storage capacity of the Dongting Lake and Poyang Lake due to reclamation also magnified the flood scale.A flood water level was higher comparing the flood water discharge due to decrease of flood discharge capacity by the construction of a large number of buildings and circle levees which are called as "yuan" in Chinese in the riverside lands, as well as due to aggradation of the river bed. In this paper, the results obtained by the hearing and the field survey concerning the cause of the great flood, flood control planning of the Changjiang River, the aspects of flood and flood disasters, and countermeasures in future, are reported.

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