Surface water-groundwater exchange dynamics in buried-valley aquifer systems

被引:11
作者
Wallace, Corey D. [1 ]
Soltanian, Mohamad Reza [1 ,2 ]
机构
[1] Univ Cincinnati, Dept Geol, Cincinnati, OH 45220 USA
[2] Univ Cincinnati, Dept Environm Engn, Cincinnati, OH USA
基金
美国国家科学基金会;
关键词
buried‐ valley aquifer; groundwater; heterogeneity; hyporheic exchange; riparian; spectral analysis; surface water‐ groundwater interactions; water quality; HETEROGENEITY; STREAM; RIVER; PATTERNS; ZONE;
D O I
10.1002/hyp.14066
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
Groundwater is a primary source of drinking water worldwide, but excess nutrients and emerging contaminants could compromise groundwater quality and limit its usage as a drinking water source. As such contaminants become increasingly prevalent in the biosphere, a fundamental understanding of their fate and transport in groundwater systems is necessary to implement successful remediation strategies. The dynamics of surface water-groundwater (hyporheic) exchange within a glacial, buried-valley aquifer system are examined in the context of their implications for the transport of nutrients and contaminants in riparian sediments. High conductivity facies act as preferential flow pathways which enhance nutrient and contaminant delivery, especially during storm events, but transport throughout the aquifer also depends on subsurface sedimentary architecture (e.g. interbedded high and low conductivity facies). Temperature and specific conductance measurements indicate extensive hyporheic mixing close to the river channel, but surface water influence was also observed far from the stream-aquifer interface. Measurements of river stage and hydraulic head indicate that significant flows during storms (i.e., hot moments) alter groundwater flow patterns, even between consecutive storm events, as riverbed conductivity and, more importantly, the hydraulic connectivity between the river and aquifer change. Given the similar mass transport characteristics among buried-valley aquifers, these findings are likely representative of glacial aquifer systems worldwide. Our results suggest that water resources management decisions based on average (base) flow conditions may inaccurately represent the system being evaluated, and could reduce the effectiveness of remediation strategies for nutrients and emerging contaminants.
引用
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页数:13
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