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[1]WANG Ying-hua,ZHANG Xin.Analysis on the Characteristic and Change Trend of Precipitation in Xi’ning City[J].Research of Soil and Water Conservation,2011,18(05):156-160.

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Analysis on the Characteristic and Change Trend of Precipitation in Xi’ning City

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 18 Number of periods: 2011 05 Page number: 156-160 Column: Public date: 2011-10-20

Title:: Analysis on the Characteristic and Change Trend of Precipitation in Xi’ning City

Author(s):: WANG Ying-hua, ZHANG Xin; College of Water Resources and Architecture Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: precipitation; change trend; mutation; Xi’ning City

CLC:: P426.6

DOI:: -

Abstract:: Precipitation is the main source of water resources in Xi’ning City and study on the time series variation plays an important role in the rational development and utilization of their water resources. This paper selects 1960-2005 daily precipitation data of weather stations including Xi’ning station, Datong Station, Huangzhong station and Huangyuan station by using moving average value, linear trend rate law and M-K rank correlation method to explore the characteristics of Xi’ning City mutation of precipitation, and the future trend of precipitation was predicted by means of generating function model. The results showed that in Xi’ning City, uneven distribution of rainfall during the years, mainly occurs from May to September, which accounted for about 80% of annual precipitation; annual precipitation did not change significantly and C_v values of the annual precipitation of 4 stations were between 0.15～0.20; precipitation abundant dry change exists obvious age border change; the changes in rainfall trend all did not reach 90%, 95% and 99% significant level. Looking at the statistics from the annual trend, only Xi’ning station’s rainfall remarkablely reached to 99% of the confidence level and annual precipitation slightly increased; annual precipitation did not mutate; precipitation will increase in the coming ten years.

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