降雨对渭河流域陕西片径流的影响鉴别

Identification of the impact of rainfall on runoff in Weihe River Basin in Shaanxi

水文循环的变化受控于自然和人类活动两组向量。结合渭河流域陕西片的降雨变化趋势,建立了运用分布式水文模型预测流域径流变化规律的情景分析方法。选取降雨作为流域径流的主要影响因子,随机设定一系列降雨情景,通过模型计算有效揭示降雨对流域径流及水文循环的影响效应。结果表明:在现状下垫面等条件下,渭河流域陕西片的地表水资源主要取决于降雨资源。对于不同的降雨情景,其年降雨总量对年径流总量影响显著,而年内的月径流量虽然呈现基本一致的变化趋势,但月径流量的峰值大小及出现时间呈现出明显的随机性。

Changes of hydrological cycle are controlled by two sets of vectors as natural and human activities.According to the change trend of rainfall in Weihe River Basin in Shaanxi,the paper established the scenario analysis method to predict the changes of runoff using distributed hydrological model.A series of rainfall were selected as the main factor of the basin runoff.Then,the effect of rainfall on runoff and hydrological cycle was revealed through the distributed hydrological model.The results showed that under the status of land surface,the surface water resources of Weihe River Basin in Shaanxi mainly depends on the rainfall.For different rainfall scenes,the annual rainfall has the significant effect on annual runoff.However,although the monthly runoff distribution of the year shows the same trend basically,the size of monthly runoff and the emergence of peak time show the apparent randomness.