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[1]WANG Zhi-liang,LI Xin-ya,YANG Ai-qin,et al.Analysis of Precipitation Characteristics of the Fifteen Periods on the Loess Plateau of Shaanxi Province[J].Research of Soil and Water Conservation,2013,20(05):176-179.

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Analysis of Precipitation Characteristics of the Fifteen Periods on the Loess Plateau of Shaanxi Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 20 Number of periods: 2013 05 Page number: 176-179 Column: Public date: 2013-10-28

Title:: Analysis of Precipitation Characteristics of the Fifteen Periods on the Loess Plateau of Shaanxi Province

Author(s):: WANG Zhi-liang^1,2, LI Xin-ya^1,2, YANG Ai-qin³, YANG Qiong^1,2, LEI Yan-peng^1,2, SUN Zhi-hui^1,2; 1. Institute of Arid Meteorology, CMA, Lanzhou 730020, China;
2. Meteorological Bureau of Yan’an, Yan’an, Shaanxi 716000, China;
3. Technology Training Center of Ansai County, Ansai, Shaanxi 717400, China

Keywords:: precipitation intensity; the Loess Plateau of Shaanxi Province; climate analysis

CLC:: P426.64⁺4

DOI:: -

Abstract:: In this paper, the precipitation distribution and the precipitation intensity of 15 periods precipitation was analyzed based on 38 weather stations in recent decade periods of precipitation data in the Loess Plateau of Shaanxi Province. The cycle time of periods precipitation and the trend were obtained. It is used for reference to the local agriculture and soil and water conservation practices. According to the precipitation of 15 precipitation periods in the calendar year in 38 stations on the Loess Plateau of Shaanxi Province, a preliminary analysis about precipitation intensity of climate profile was carried out. The results show that the maximum precipitation of 15 periods of the Loess Plateau of Shaanxi Province had an obviouse change and the same paragraph precipitation between the maximum was the 11.6 to 18.5 times. The curve of maximum precipitation intensity is discribed by expotential function and maximum precipitation intensity is 0.2 mm and 4.4 mm, the shorter the time and the greater the precipitation intensity. 15 precipitation periods of maximum precipitation appear in midsummer mostly from July to August, and the number of occurrences is more than 70% within a day 12 hours to 20 hours. Two or more counties each period precipitation extremes rarely appear with a precipitation process, so the small range of the high-intensity rainfall presents in the Loess Plateau of Shaanxi Province, and mainly impacts a county. The precipitation cumulative anomaly trend in each station is not the same, but increased greatly in recent years generally. The county mutation is less, the change of Chunhua county apeares suddenly in 2004. The precipitation sequence has phenomenon of cycle change for as 3 a, 6～8 a and 16 a.

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