The variation of drought and flood in Haihe river basin over the past 500 years
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Abstract:
Study the variation of historical drought and flood has important practical significance for regional comprehensive disaster prevention and mitigation. In this paper, we use the drought and flood records reconstructed the comprehensive index series of regional drought and flood over the past 500 years, and analyed of the variation of flood and drought in Haihe River Basin of 1470-2000. The study found that the drought and flood disasters in Haihe River Basin has obvious fluctuation, showed the periodic phenomenon of “dry - wet - dry”. In 16th Century, the drought disaster became more and more frequent, and reached the peak at the beginning of 17th Century. From last part of 17th to 19th Century, the Haihe River Basin once again moved into the relatively wet period. On 1920s, Haihe river basin moved into dry period, and the disaster intensity increased year by year. At the same time, the Haihe River Basin has obvious periodic process of drought and flood, which is 2.5A, 9.8a, 18.6a, 31.3a, 83.5a, 125.3a and 167.0a, respectively.
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