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首页> 外文期刊>Transactions of the ASABE >Rainfall Intensity-Dependent Infiltration Rates on Rangeland Rainfall Simulator Plots
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Rainfall Intensity-Dependent Infiltration Rates on Rangeland Rainfall Simulator Plots

机译：牧场降雨模拟器图上取决于降雨强度的渗透率

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摘要

Most implementations of infiltration equations with rainfall-runoff models use a hydraulic conductivity parameter that is constant for a given rainfall event. However, plot data from rainfall simulator experiments and natural rainfall events have shown that infiltration rates can increase with increasing rainfall rate instead of decreasing with time or infiltrated depth, as predicted by infiltration models. This has been hypothesized to be a function off the spatial variability of the infiltration capacity across the area. In this article, an exponential model relating steady-state infiltration rate with rainfall intensity and the average areal infiltration rate when the area under consideration is contributing to runoff is evaluated using data from variable-intensity rainfall simulator experiments. The experiments were conducted on five rangeland vegetation-soil associations at the Walnut Gulch Experimental Watershed in southeastern Arizona. The results from 19 rainfall simulation runs show that the increase in infiltration rate with increasing rainfall intensity can be significant and that the exponential model represents the relationship between steady-state infiltration and rainfall intensity. The exponential model coupled with a kinematic wave model also represents the hydrographs better than the Green-Ampt Mein-Larsen infiltration model coupled with the same routing model. The time to the start of runoff is influenced more by rainfall intensity than by initial soil moisture conditions, particularly when the initial rainfall intensity was high. The rapid time to steady-state runoff at the beginning of the simulation run of the observed runoff hydrographs suggests that the infiltration rates become constant more quickly than infiltration theory would suggest.
机译：使用降雨-径流模型的渗透方程的大多数实现都使用对于给定的降雨事件恒定的水力传导率参数。但是，来自降雨模拟器实验和自然降雨事件的地块数据表明，渗透率可以随着降雨率的增加而增加，而不是如渗透模型所预测的那样随时间或渗透深度而降低。假设这是整个区域渗透能力空间变异性的函数。在本文中，使用可变强度降雨模拟器实验的数据评估了一个指数模型，该模型将稳态入渗率与降雨强度以及当考虑区域有助于径流时的平均面积入渗率联系起来。实验是在亚利桑那州东南部的核桃谷实验流域的五个草地植被-土壤协会上进行的。 19次降雨模拟运行的结果表明，入渗率随降雨强度的增加而增加，并且该指数模型代表稳态入渗与降雨强度之间的关系。与运动波模型耦合的指数模型和运动波模型相比，Green-Ampt Mein-Larsen渗透模型也能更好地代表水文图。径流开始的时间受降雨强度的影响大于受初始土壤湿度条件的影响，尤其是在初始降雨强度较高​​的情况下。在观察到的径流水文图模拟运行开始时，达到稳态径流的快速时间表明，入渗速率比入渗理论所建议的更快地变得恒定。

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  • 来源
    《Transactions of the ASABE》 |2008年第1期|p.45-53|共9页
  • 作者

    J. J. Stone G. B. Paige R. H. Hawkins;

  • 作者单位

    The authors are Jeffry J. Stone, Hydrologist, USDA-ARS Southwest Watershed Research Center, Tucson, Arizona;

    Ginger B. Paige, Assistant Professor, Department of Renewable Resources, University of Wyoming, Laramie, Wyoming;

    and Richard H. Hawkins, Professor, Water Resources Program, School of Natural Resources, University of Arizona, Tucson, Arizona. Corresponding author: Jeffry J. Stone, USDA-ARS-SWRC, 2000 E. Allen Rd., Tucson, AZ 85711;

    phone: 520-670-6381;

    fax 520-670-5550;

    e-mail: jstone@tucson.ars.ag.gov.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Infiltration, Partial area response, Rainfall intensity, Rainfall simulation, Runoff;

    机译：入渗;局部响应;降雨强度;降雨模拟;径流;

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