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基于Nash瞬时单位线法,结合Horton土壤入渗经验模型,并考虑植被对降雨的截流作用,建立了渗透坡面汇流计算的数学模型。以矩形坡面为研究对象,基于其汇流时间-面积特性,结合等流时线法,推导建立了Nash瞬时单位线参数n、K的确定方法。其中,参数n的值为1.0,K的值与坡面汇流时间相等,相当于单一线性水库。应用本文建立的模型,对林地渗透坡面降雨径流进行计算,并与实测值进行比较。结果表明,计算值与实测值的变化趋势基本吻合,初步验证了本文方法的合理性。
Based on the Nash instantaneous unit-line method, combined with the Horton soil infiltration empirical model and considering the interception effect of vegetation on rainfall, a mathematic model of confluence calculation on infiltration slope was established. Taking the rectangular slope as the research object, the method of determining n, K for the instantaneous unit line of Nash was established based on the time-area characteristics of the confluence and the method of isochronous flow. Among them, the value of the parameter n is 1.0, the value of K is equal to the slope confluence time, which is equivalent to a single linear reservoir. The model established in this paper is used to calculate the rainfall runoff on the infiltration slope of forestland and compare it with the measured value. The results show that the calculated value is in good agreement with the trend of the measured value, which proves the rationality of this method.