| Analysis on evolution law of meteorological and hydrological drought and wetting |
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| DOI：10.7606/j.issn.1000-7601.2012.02.40 |
| Key Words: Wei River wet and drought meteorology hydrology evolution law human activity |
| Author Name | Affiliation | | BAI Hua | Northwest A & F University, Yangling，Shaanxi 712100, China | | MU Xingmin | Northwest A & F University, Yangling，Shaanxi 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | WANG Fei | Northwest A & F University, Yangling，Shaanxi 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | GAO Peng | Northwest A & F University, Yangling，Shaanxi 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Runoff basically origins from precipitation. The differences of the evolution law between them could effectively reveal the effect of human activities on drought and wetting. This paper based on hydrological and meteorological data, the watershed precipitation is calculated by Thiessen Polygon method and the 12 month standardized precipitation index (SPI12) is also acquired. Furthermore, the spatial distribution of SPI12 is presented by different typical frequencies an
d its effects on runoff coefficient have also been detected. Moreover, the evolution law of SPI12 and runoff is analyzed by EOF and time series analysis method, the synchronization and induction of which is also detected. The results s
hows that the watershed precipitation corresponding to 25%, 50% and 75% frequencies are respectively 582.5 mm, 518.6 mm and 467.5mm. And the 1st principal component of SPI12 decrease significantly and appears wet-normal-wet-normal-drought during 1962.9～1969.7～1983.2～1985.8～1991.7～1999.12 , the change point of which is 1991.7. The runoff in Wei River decreases significantly and abruptly changes in 1989a.And the runoff presents wet in 1950—1968a, normal in 1995—2002a and drought in 1970—1974, 1976—1980, 1994—2007a. The human activities, including water conservancy project，water and soil conservation measurement and urbanization, make the change point of runoff earlier than that of SPI12, the runoff more dry than the 1st principal component of SPI12, and lead to the mismatch of wet, normal and drought types between runoff and SPI12 during 1970—1996a. |
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