河北雨洪模型中下渗公式的一种改进方法

发布时间：2018-04-19 15:44

本文选题：河北雨洪模型 + 降雨强度　；参考：《水文》2016年03期

【摘要】：下渗强度的计算是干旱半干旱地区超渗产流计算的关键环节。河北雨洪模型中的流域下渗强度计算公式由两部分组成,一部分为由张力引起的下渗强度,另一部分为由重力引起的下渗强度(稳定下渗能力)。计算以上两部分下渗强度时,公式所用的雨量有重复,致使总下渗强度普遍偏大,从而导致模型模拟的洪水过程的洪量及洪峰偏小。提出一个改进的流域下渗强度计算公式,计算张力引起的下渗时所用雨强为总雨强与稳定下渗能力的差值。利用改进前后的计算公式,分别对2mm/h到10mm/h雨强及0mm到140mm表层土湿条件下的下渗强度进行计算,并对结果进行对比分析。大阁流域的实例应用结果表明,改进后的下渗强度计算公式,对模拟洪水过程的洪量和洪峰流量的增加效果明显,增加值分别为实测值的14.14%和10.08%。
[Abstract]:The calculation of the infiltration strength is the key link in the calculation of the hyper production flow in arid and semi-arid areas. The calculation formula of the drainage strength of the basin in the Hebei rainwater model is composed of two parts, one part is the infiltration strength caused by the tension, the other part is the infiltration strength caused by gravity (stable infiltration capacity). The seepage strength of the above two parts is calculated. The amount of rainfall used in the formula is repeated, resulting in the general low infiltration strength, which leads to the small flood and peak of flood process in the model simulation. An improved calculation formula for the drainage strength of the basin is put forward to calculate the difference between the rainfall intensity and the steady infiltration capacity of the total rainfall caused by the tension, and the calculation formula before and after the improvement is used. The infiltration strength of 2mm/h to 10mm/h rain intensity and 0mm to 140mm surface soil wetting conditions are calculated respectively, and the results are compared and analyzed. The application results of the case of the Great Pavilion basin show that the improved calculation formula of infiltration strength is obvious to the increase of flood and peak flow in the simulated flood process, and the added value is 1 of the measured value respectively. 4.14% and 10.08%.

【作者单位】：中国矿业大学资源与地球科学学院;河北省水文水资源勘测局;
【分类号】：P333.2

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