[1]DU Huaming,HE Shengying.The Analysis on Characteristics of Precipitation and Trends in Drought and Flood Disasters in Minjiang River Basin[J].Research of Soil and Water Conservation,2015,22(01):153-157.
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The Analysis on Characteristics of Precipitation and Trends in Drought and Flood Disasters in Minjiang River Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
22
Number of periods:
2015 01
Page number:
153-157
Column:
Public date:
2015-02-28
- Title:
- The Analysis on Characteristics of Precipitation and Trends in Drought and Flood Disasters in Minjiang River Basin
- Keywords:
- Minjiang River Basin; precipitation character; standardized precipitation index (SPI); droughts and floods
- CLC:
- P333.1;P954
- DOI:
- -
- Abstract:
- Based on the monthly precipitation data of the 14 meteorological stations in Minjiang River Basin from 1961 to 2012, the spatiotemperal evolution characteristics of precipitation were analyzed by using the method of mathematical statistics combined with GIS spatial analysis technology, and the different scales of drought-flood were analyzed by using the standardized precipitation index (SPI). The results show that: (1) the mean annual precipitation significantly decreased in the past 52 years in Minjiang River Basin, the precipitation tendency rate was 20.18 mm/10 a; the annual average precipitation mutation occurred in 1993; (2) the precipitation in this basin showed a decreasing trend from southeast to northwest area, Songpan-Xiaojin-Kangding was recognized as the boundary, the annual precipitation was 616~1 000 mm in western area of the line; and 1 000~1 732 mm in east of the line; (3) the precipitation showed an increasing trend in western area of the Songpan-Xiaojin-Kangding, the precipitation tendency rate was 0~27.11 mm/10 a; the precipitation showed a decreasing trend in east of the boundary, decreasing trend rate was 0~80 mm/10 a; (4) there was an obvious flood to drought trend in Minjiang River Basin, it was waterlogging from 1961 to 1967, the frequency of droughts was high from 1968 to 1972, the floods were frequent from 1973 to 1993; the frequency and degree of droughts increased from 1994 to 2012; (5) It was waterlogging before 1990, and dry after 1990 in Minjiang River Basin, the trend in conversion of waterlogging to drought was obvious, so preventing and controlling drought work should be done in the next period.
- References:
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