Some relationships between lithology, basin form and hydrology: a case study from the Thames basin, UK
Some relationships between lithology, basin form and hydrology: a case study from the Thames basin, UK
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DOI：
10.1002/hyp.8024
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发表时间：
2011-07-30
影响因子：
3.2
通讯作者：
Newell, A. J.
中科院分区：
文献类型：
--
作者：
Bloomfield, J. P.;Bricker, S. H.;Newell, A. J.
岩性在影响盆地的形式和功能的作用进行了实证研究，通过调查一系列的集水变量之间的相关性，分析的空间单位不是地表集水，但岩性连贯的地下水单位。以英国泰晤士河流域为例，确定了9个地下水单元。11个水文和地貌变量，包括降雨量，排水密度，基流指数，含水层孔隙度，蓄水系数和对数导水率，含水层和排水高程，河流下切，和高程积分值已估计为每个地下水单位在盆地中，皮尔逊相关系数计算的所有对变量。发现7个相关系数在> 99%的置信水平下是显著的。排水密度与log含水层导水率、排水密度与河流下切呈负相关关系，而log含水层导水率与河流下切呈正相关关系，log含水层导水率与基流指数、基流指数与河流下切呈正相关关系，推测出一致的因果解释。例如，河流切入含水层导致河流附近水力梯度相对增加，这反过来又促进次生孔隙的发展，增加含水层的水力传导性，从而增加基流指数。这一解释的含义是，盆地的地貌演变是密切相关的演变的水力传导的下伏含水层。这是一致的，并支持耦合复杂演变的地表水-地下水系统的概念。版权所有. (C)2011年约翰威利父子有限公司
The role of lithology in influencing basin form and function is explored empirically by investigating correlations between a range of catchment variables, where the spatial unit of analysis is not surface catchments but lithologically coherent groundwater units. Using the Thames basin, UK, as a case study, nine groundwater units have been identified. Values for 11 hydrological and geomorphological variables, including rainfall, drainage density, Baseflow Index, aquifer porosity, storage coefficient and log-hydraulic conductivity, aquifer and drainage elevation, river incision, and hypsometric integral have been estimated for each of the groundwater units in the basin, and Pearson correlation coefficients calculated for all pairs of variables. Seven of the correlation coefficients are found to be significant at a confidence level of >99%. Negative correlations between drainage density and log aquifer hydraulic conductivity, and between drainage density and river incision, and positive correlations between log-hydraulic conductivity and river incision, log-hydraulic conductivity and Baseflow Index, and between Baseflow Index and river incision are inferred to have consistent causal explanations. For example, incision of rivers into aquifers leads to relative increases in hydraulic gradients in the vicinity of rivers which, in turn, promotes the development of secondary porosity increasing both aquifer hydraulic conductivity and, hence, Baseflow Index. The implication of this interpretation is that the geomorphological evolution of basins is intimately linked to the evolution of hydraulic conductivity of the underlying aquifers. This is consistent with, and supports the notion of a coupled complexly evolving surface water-groundwater system. Copyright. (C) 2011 John Wiley & Sons, Ltd.