北京师范大学学报（自然科学版）2009，Vol.45Issue(5)：575-581,7.
陕西省降水时空变化特征及资源化研究
SPATIO-TEMPORAL VARIATION AND UTILIZATION OF PRECIPITATION IN SHAANXI PROVINCE
摘要
Abstract
Precipitation is a major component of the water cycle, being responsible for depositing most of the fresh water on the planet. Growing interests in society for solving water crisis have led to different attempts to use rainfall. Rainfall utilization provides a sustainable water supply in urban areas and buffers extreme runoff situations in watercourses. Analysis of temporal and spatial variations in precipitation is of great importance in the planning and management of rainfall utilization. Based on database for monthly precipitation collected from 97 meteorological stations from 1961-2005, the temporal and spatial distributions of precipitation in Shaanxi province are analyzed. Long-term trends in precipitation are determined using Mann-Kendall tests. It was found that mean annual precipitation in southern Shaanxi (Shannan) is higher than in northern Shaanxi (Shanbei). Most of the precipitation is concentrated in the rainy seasons of summer and autumn, accounting for 56.3% of total annual precipitation. For mean annual precipitation, 5 counties and cities have an increase-trend while other 92 counties and cities have a decrease-trend, with a mean gradient of 3 mm·a~(-1). For mean seasonal precipitation, the precipitation in the seasons of spring and autumn is in a decrease-trend and that in the winter is in a small increase-trend for the whole province area. However, precipitation in summer is a slight decrease for north Shaanxi and that an increase in Guanzhong and south Shaanxi. Considering rainfall utilization, soil infiltration as well as underground storage reservoir can be developed to collect rainfall for north Shaanxi. Storaging and infiltrating rainfall in loess hill of Guanzhong plain can increase urban groundwater table. Moreover, it is necessary to build rainfall conservation reservoirs and to plant forest trees for conserving water supply in south Shaanxi,being beneficial to water sources protection and to sustainable usage of water resources in Guanzhong through water transfer project from south Shaanxi.关键词
降水/时空变化/Mann-KendalJ趋势检验/陕西省Key words
precipitation/temporal and spatial variability/Mann-Kendall test/Shaanxi province分类
天文与地球科学引用本文复制引用
宋进喜,宋令勇,惠泱河,王红瑞..陕西省降水时空变化特征及资源化研究[J].北京师范大学学报（自然科学版）,2009,45(5):575-581,7.基金项目
国家自然科学基金资助项目(50609021) （50609021）
