A simple overland flow calculation method for distributed groundwater recharge models
A simple overland flow calculation method for distributed groundwater recharge models
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一种简单的分布式地下水补给模型地表径流计算方法
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Hughes
中科院分区：
文献类型：
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作者：
M. Mansour;A. Barkwith;A. Hughes
提出了一种改进分布式地下水补给模型中地表流量计算的方法，并将其应用于英国泰晤士盆地的两个子集水区。补给计算研究倾向于以一种简单的方式模拟河流流量的径流成分，通常作为特定时期降雨的一小部分。本研究中概述的方法旨在改进分布式补给模型中地下水补给估算的计算，但并未提供复杂的地表流模拟器的替代方法。该方法使用季节变化系数来计算特定水文地质类别或径流带的径流，用于模拟整个流域的基流指数变化。它采用传递函数模型来表示集水区蓄水量。采用蒙特卡罗模拟对径流值进行了细化。分离两个子集水区之间的径流带，使模拟值和观测值之间的匹配更好；然而，观测到的径流与模拟输出之间的差异表明，在对径流区进行分类时，需要考虑其他因素，如影响径流产生的土地利用和地形特征。英国地质调查局©NERC 2011。水文过程©2011 John Wiley & Sons， Ltd。
A method to improve the calculation of overland flow in distributed groundwater recharge models is presented and applied to two sub‐catchments in the Thames Basin, UK. Recharge calculation studies tend to simulate the runoff flow component of river flow in a simplistic way, often as a fraction of rainfall over a particular period. The method outlined in this study intends to improve the calculation of groundwater recharge estimates in distributed recharge models but does not present an alternative to complex overland flow simulators. This method uses seasonally varying coefficients to calculate runoff for specified hydrogeological classes or runoff zones, which are used to model baseflow index variations across the basin. It employs a transfer function model to represent catchment storage. Monte Carlo simulation was applied to refine the runoff values. Decoupling the runoff zones between the two sub‐catchments produces a better match between the simulated and observed values; however, the difference between observed runoff and the simulated output indicates other factors, such as landuse and topographical characteristics that affect the generation of runoff flow, need to be taken into account when classifying runoff zones. British Geological Survey © NERC 2011. Hydrological Processes © 2011 John Wiley & Sons, Ltd.