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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Effects of rainfall intensity on groundwater recharge based on simulated rainfall experiments and a groundwater flow model
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Effects of rainfall intensity on groundwater recharge based on simulated rainfall experiments and a groundwater flow model

机译：基于模拟降雨实验和地下水流模型的降雨强度对地下水补给的影响

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摘要

It is important that groundwater discharges sustain baseflow to rivers for the ecological basic flow protection. The objective of this study was to assess the impact of rainfall intensity on groundwater regime under the bare slope condition. A three-dimensional finite-difference groundwater flow model (MODFLOW) was constructed and calibrated and combined with simulated rainfall experiments to study this impact. Groundwater recharge coefficients for different rainfall intensities with a constant amount of rainfall (120 mm) were calculated by using PEST-ASP program of MODFLOW. The values decreased from 0.439 to 0345, 0327, 0.167, 0.138, 0.076 with rainfall intensities increasing from 45 mm/h to 60/75/90/105/120 mm/h respectively; recharge coefficients were described by a negative linear relationship. The simulated scenarios indicated decreases in both recharge volumes and the hydraulic head coincided with increases in rainfall intensities, while recharge rates and runoff of groundwater increased with modest intensities (= 75 mm/h) increasing and decreased when intensities became larger (>75 mm/h). Though recharge rate and runoff for different rainfall intensities did not approach a common value, but instead stabilized at different values for each rainfall intensity event. It was concluded that rainfall intensity has great influence on groundwater regime. These are of great importance in ecological basic flow protection, river harnessing and watershed management in some extent. (C) 2014 Elsevier B.V. All rights reserved.
机译：为保护生态基本流量，地下水排放必须维持向河流的基流。这项研究的目的是评估裸露斜坡条件下降雨强度对地下水状况的影响。建立并校准了三维有限差分地下水流模型（MODFLOW），并与模拟降雨实验相结合来研究这种影响。使用MODFLOW的PEST-ASP程序，计算出恒定降雨量（120 mm）下不同降雨强度下的地下水补给系数。降雨强度从45 mm / h分别增加到60/75/90/105/120 mm / h，从0.439降低到0345、0327、0.167、0.138、0.076;充电系数由负线性关系描述。模拟场景表明补给量和水头均下降，同时降雨强度增加;补给量和地下水径流随中等强度（<= 75 mm / h）的增加而增加，强度增加时（> 75 mm /H）。虽然不同降雨强度的补给率和径流量没有达到一个共同的值，但是对于每个降雨强度事件却稳定在不同的值。结论是降雨强度对地下水状况有很大影响。这些在一定程度上对生态基本流量保护，河流治理和流域管理具有重要意义。 （C）2014 Elsevier B.V.保留所有权利。

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