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海原县地处宁夏回族自治区六盘山区西北麓,属北温带大陆季风气候,干旱少雨,年降水397.2mm,且大多以暴雨形式出现在7～9月,占全年降水量的73％,年蒸发量2200mm。水系以南华山、西华山为中心呈放射状展布。沟道长年干涸,境内河流多为季节性河流。境内水灾害为境内暴洪灾害。暴雨一般出现在6～9月,7～8月出现的次数最多。1949～1998年共发生洪涝灾害170余次,年均4～5次。 一、洪涝灾害的特点 1.暴雨突发性强、强度大、历时
Haiyuan County is located in the northwestern part of Liupanshan District of Ningxia Hui Autonomous Region. It belongs to the northern temperate continental monsoon climate, with aridity and rainfall of 397.2mm. Most of them are in the form of rainstorms in July-September, accounting for 73% of the annual precipitation, Evaporation of 2200mm. South Huashan water system, West Huashan as the center was radial distribution. Channel dried up for many years, the territory of the river mostly seasonal rivers. Domestic water disaster is a flash flood disaster in China. Rainstorms generally occur in June-September, with the highest number occurring in July-August. A total of more than 170 floods and floods occurred between 1949 and 1998, with an average annual rate of 4 to 5 times. First, the characteristics of floods 1. Storm suddenly strong, intense, lasted