Seasonal and interannual behaviour of groundwater catchment boundaries in a Chalk aquifer Seasonal Groundwater Catchment Dynamics
Seasonal and interannual behaviour of groundwater catchment boundaries in a Chalk aquifer Seasonal Groundwater Catchment Dynamics
复制标题
白垩含水层地下水流域边界的季节性和年际行为 季节性地下水流域动态
DOI：
10.1002/hyp.10540
复制
发表时间：
2016
影响因子：
3.2
通讯作者：
Parker S
中科院分区：
文献类型：
--
作者：
Parker S
通常假定地下水集水区边界及其相关的地下水集水区是按季节固定的。我们使用钻孔水文数据和基于物理的分布式区域地下水模型，调查了英国高渗透性碳酸盐含水层--伯克希尔和马尔伯勒唐斯白垩岩含水层是否存在这种情况。利用钻孔水文数据时间序列构造月内插地下水位面，并由此推算出地下水月集水边界。实地调查结果表明，地下水集水面积的年平均变化约为平均集水面积的20%，但年际变化可能很大，估计的最大集水面积比最小集水面积大约80%。河流中的流量也取决于地下水的集水区。模型结果证实了基于现场数据的结果。这些发现对确定水源保护区、基于水平衡计算的补给量估计以及地表水和地下水系统的综合概念模型等问题具有重大影响。版权所有©2015 John Wiley&Sons，Ltd.
Groundwater catchment boundaries and their associated groundwater catchment areas are typically assumed to be fixed on a seasonal basis. We investigated whether this was true for a highly permeable carbonate aquifer in England, the Berkshire and Marlborough Downs Chalk aquifer, using both borehole hydrograph data and a physics‐based distributed regional groundwater model. Borehole hydrograph data time series were used to construct a monthly interpolated water table surface, from which was then derived a monthly groundwater catchment boundary. Results from field data showed that the mean annual variation in groundwater catchment area was about 20% of the mean groundwater catchment area, but interannual variation can be very large, with the largest estimated catchment size being approximately 80% greater than the smallest. The flow in the river was also dependent on the groundwater catchment area. Model results corroborated those based on field data. These findings have significant implications for issues such as definition of source protection zones, recharge estimates based on water balance calculations and integrated conceptual modelling of surface water and groundwater systems. Copyright © 2015 John Wiley & Sons, Ltd.