Analysis on Period Characteristics and Variation Trends of Rainfall Series in Nanliujiang River
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Abstract:
Attention should be paid on variations and trends of rainfall series before basic flood control and drought relief. By taking the Nanliujiang river basic of Beibu gulf economic region as an example, this paper used wavelet analysis and R/S analysis to research the period characteristics and variation trends of rainfall series. Studies were discussed for flood control scheduling in the range of short period. The results of wavelet analysis and R/S analysis showed that upper reaches of Nanliujiang river had an obvious period about 3 or 8 year, the annual rainfall is tending to decrease in the future; that middle reaches of Nanliujiang river had an obvious period about 3 or 8 year, the annual rainfall is tending to increase in the future; that lower reaches of Nanliujiang river had an obvious period about 5 or 8 year, the annual rainfall is tending to increase in the future. It was concluded that the flood control focuses on the middle and lower reaches of Nanliujiang river, but also need to prevent unexpected rainfall.
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