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《Ecology and Environmental Sciences》 2013-09
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Spatio-temporal variation of erosive precipitation in the Han River Basin during the past 60 years

ZHU Mingyong;TAN Shuduan;ZHANG Quanfa;Department of History and Sociology,Minnan Normal University;College of Bioscience and Biotechnology,Hunan Agricultural University;Key Laboratory of Aquatic Botany and Watershed Ecology,Wuhan Botanical Garden,Chinese Academy of Sciences;  
Flood disaster and soil erosion are the most important environmental concerns in the Han River basin. Both problems are closely related to rainfall, especially erosive rainfall(≥12 mm/d). Erosive rainfall is the driving force of severe soil erosion and is the direct cause of flood disaster. Thus the study of erosive rainfall patterns in the Han River basin has important practical significance. Daily rainfall data during the period of 1951-2012 were used to investigate the spatio-temporal variations in annual rainfall, annual erosive rainfall and annual rainstorm in the Han River basin. The data were from 47 meteorological stations in or near the study area. Conventional statistical methods were used to analysis relationships between the three rainfall indices(annual rainfall,annual erosive rainfall and annual rainstorm). The mean annual value, anomaly percentage of every year, and variation coefficient of the three rainfall indices were calculated. Then the temporal variation of rainfall was revealed. Spatial distribution of the three rainfall indices about the 47 meteorological stations were derived by the Kriging weighting interpolation method in a GIS platform with the help of Geographic Information System(GIS) technology. The results showed that the mean annual precipitation is 886 mm, mean annual erosive rainfall(≥12 mm) is 614.1 mm, and mean annual storm rainfall(≥50 mm) is 167.6 mm in the Han River basin during the study period. The annual rainfall, erosive rainfall and rainstorm decreased over the past six decades, but the tendency is not significant. There is no significant wet-dry trend displayed. The fluctuation range of the annual rainstorm amount is more than that of the annual rainfall amount. All the three rainfall indices decreased gradually from southeast direction to northwest direction.The results can improve the understanding of the rainfall variation law in the Han River basin. It can provide a reference for the vegetation ecological construction in the upper reaches of the Han River basin and flood control and disaster mitigation in the middle and lower reaches of the Han River basin.
【Fund】: 国家“十一五”科技支撑项目(2006BAC10B020);; 福建省教育厅资助科技项目(JA13194);; 中国博士后科学基金项目(2013M542390)
【CateGory Index】: S157
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