关岭县蚂蝗田小流域降雨年内分配特征研究

根据贵州省关岭县蚂蝗田小流域2009—2012年的降雨数据，统计分析了降雨集中度、集中期、年内分配不均匀系数等指标，研究了蚂蝗田小流域降雨的年内分配特征。结果表明:蚂蝗田小流域中雨、小雨全年分配均匀；大雨、暴雨分配不均匀。无论是枯水年还是丰水年，降雨的分配特征大体相同；旬降雨量波动很明显，降雨在月内分配不均匀。年内降水集中度为0.78~0.81，集中期变化于18~20旬，年内分配不均匀系数大于0.8。无论从4年总体还是各年情况来看，侵蚀性降雨分布都不均匀，主要集中在5—10月，其中6—7月侵蚀性降雨次数最多。

Study on Annual Distribution Characteristics of Rainfall in Mahuangtian Catchment of Guanling County

Based on the rainfall data from 2009 to 2012 in Mahuangtian catchment of Guanling County in Guizhou Province, the rainfall concentration, concentration period and uneven distribution coefficient were analyzed and the annual distribution characteristics of rainfall were studied. The results showed that the moderate or light rainfall in Mahuangtian catchment evenly distributed throughout the year; and heavy rain, rainstorm distributed unevenly; the distribution characteristics of rainfall is approximately the same in dry year or wet year; ten-day rainfalls had an obvious fluctuation, and rainfalls in a month unevenly distributed. Annual precipitation concentration degrees ranged from 0.78 to 0.81, precipitation concentration periods changed in 18 to 20 ten-day, uneven coefficient of annual distribution was greater than 0.8. Erosive rainfall is unevenly distributied, mainly concentrated in May to October, and mostly was from June to July within the total or each year of the four years.