干旱区生态环境知识资源中心(Arid): Changes to inter-aquifer exchange resulting from long-term pumping: implications for bedrock groundwater recharge

Arid

DOI	10.1007/s10040-020-02141-x
	Changes to inter-aquifer exchange resulting from long-term pumping: implications for bedrock groundwater recharge
	Cognac, Kristen E.; Ronayne, Michael J.
通讯作者	Ronayne, Michael J.
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2020
卷号	28 期号:4 页码:1359-1370
英文摘要	Extensive pumping of aquifer systems alters the water budget components for individual aquifer units. This study evaluated long-term changes in alluvial-bedrock groundwater exchange within a highly pumped region of the Denver Basin Aquifer System, Colorado (USA). For a data set spanning five decades, bedrock-aquifer water levels were compared to the elevation of mapped stream alluvium in three-dimensional space, providing a description of spatiotemporal changes in the relationship between the alluvial and bedrock aquifers. Results clearly show increased downward hydraulic gradients (from the alluvial aquifer to underlying sedimentary bedrock); thus, recharge to the bedrock aquifer has increased over time. Variably saturated flow modeling was performed to investigate the dependence of recharge on the bedrock aquifer's water-table position. Model simulations with realistic geologic heterogeneity demonstrate the potential for unsaturated conditions within the bedrock aquifer, which may eventually produce a hydraulic disconnection between the alluvial and bedrock aquifers, limiting further pumping-induced changes in recharge. These results have important implications for understanding and forecasting long-term water-budget changes in aquifer systems subjected to high pumping stress, especially those in semi-arid regions.
英文关键词	Groundwater recharge water budget Inter-aquifer flow Numerical modeling Heterogeneity USA
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000522004600001
WOS关键词	ZONE FLOW ; WATER ; DEPLETION ; HETEROGENEITY ; STREAMFLOW ; MODELS
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
来源机构	Colorado State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314685
作者单位	Colorado State Univ, Dept Geosci, Ft Collins, CO 80523 USA
推荐引用方式 GB/T 7714	Cognac, Kristen E.,Ronayne, Michael J.. Changes to inter-aquifer exchange resulting from long-term pumping: implications for bedrock groundwater recharge[J]. Colorado State University,2020,28(4):1359-1370.
APA	Cognac, Kristen E.,&Ronayne, Michael J..(2020).Changes to inter-aquifer exchange resulting from long-term pumping: implications for bedrock groundwater recharge.HYDROGEOLOGY JOURNAL,28(4),1359-1370.
MLA	Cognac, Kristen E.,et al."Changes to inter-aquifer exchange resulting from long-term pumping: implications for bedrock groundwater recharge".HYDROGEOLOGY JOURNAL 28.4(2020):1359-1370.