| The characteristics of precipitation variation of Weihe River Basin in Shaanxi Province during recent 50 years |
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| DOI：10.7606/j.issn.1000-7601.2008.04.44 |
| Key Words: precipitation variation Weihe River Basin |
| Author Name | Affiliation | | ZHANG Hongli | Xi’an Meteorological Bureau，Xi’an，Shaanxi 710016，China；College of Resources and Environment Northwest A ＆ F University,Yangling,Shaanxi 712100, China | | CHEN Yu | College of Agronomy Northwest A ＆ F University,Yangling,Shaanxi 712100,China；Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | | REN Guangxin | College of Agronomy Northwest A ＆ F University,Yangling,Shaanxi 712100,China；Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province | | YANG Gaihe | College of Agronomy Northwest A ＆ F University,Yangling,Shaanxi 712100,China；Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province |
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| Abstract: |
| Based on the precipitation data of 21stations in Weihe River Basinin Shaanxi Provincein the recent 50years （1951～2005） and using Cumulative departure curve method and signal／noise radio method the temporal-spatial change characteristics of precipitation over the region are analyzed. The results indicate ：（1）With the lowering of altitude the precipitation is rising from west to east in the Weihe River basin and the range of increase is approxi mately 15．1mm on average for each 100-meter lowering of altitude；（2） Since the 1960s the average annual precipitation has assumed a drop tendency in the Weihe River with about 2mm on average for each decade；（3） There was no mutation year in the change of precipitationin the Weihe River Basin during the 50years but 1982and 2003seemed as transition years. |
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