干旱区生态环境知识资源中心(Arid): Analysis of a steady-state model of groundwater discharge in a river valley without and with evapotranspiration

Arid

DOI	10.1016/j.advwatres.2022.104306
	Analysis of a steady-state model of groundwater discharge in a river valley without and with evapotranspiration
	Pozdniakov, Sergey P.; Vasilevskiy, Peter Yu.; Wang, Ping
通讯作者	Vasilevskiy, PY
来源期刊	ADVANCES IN WATER RESOURCES
ISSN	0309-1708
EISSN	1872-9657
出版年	2022
卷号	168
英文摘要	Riparian evapotranspiration is an important process that constrains water exchanges within a well-connected river-aquifer-vegetation hydrological system. In this study, we developed an extended analytical Dupuit-Forchheimer (DF) model to consider the additional water flow resistances due to both the vertical deformation of flow lines caused by evapotranspiration and discharge into the river screened by bottom sediments in which a river does not fully penetrate the aquifer. This analytical model can describe the groundwater discharge process in the presence of riparian evapotranspiration. We validated our analytical results with numerical simulations of a 2-D flow model that explicitly considers vertical hydraulic resistances, demonstrating that the surface water-groundwater exchanges in such hydrological systems are strongly dependent on the hydrogeological parameters, river width, riparian zone width, and parameters related to the hydraulic connection between evapotranspiration and groundwater. A sensitivity analysis of our extended DF model reveals that the water balance in hyperarid regions is determined by riparian evapotranspiration, and evapotranspiration most likely causes river flow losses. However, in humid regions, most groundwater (80% or more) is discharged into rivers rather than via riparian evapotranspiration. Our results confirm that riparian evapotranspiration in arid regions is an important process that affects surface water-groundwater exchanges and that evapotranspiration from riparian zones not only reduces groundwater discharge into rivers but also potentially causes disconnections within river-aquifer systems. The obtained analytical dependencies allow the griddependent parameters of the RIV and EVT packages to be calculated in the MODFLOW simulations of regional groundwater flow discharge in a river valley using coarse grids.
英文关键词	Surface water groundwater interaction Groundwater discharge Evapotranspiration Dupuit Forchheimer assumption Sensitivity analysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000860484700002
WOS关键词	SURFACE-WATER INTERACTIONS ; FLOW ; ZONE ; CONNECTIONS ; EXCHANGE
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391559
推荐引用方式 GB/T 7714	Pozdniakov, Sergey P.,Vasilevskiy, Peter Yu.,Wang, Ping. Analysis of a steady-state model of groundwater discharge in a river valley without and with evapotranspiration[J],2022,168.
APA	Pozdniakov, Sergey P.,Vasilevskiy, Peter Yu.,&Wang, Ping.(2022).Analysis of a steady-state model of groundwater discharge in a river valley without and with evapotranspiration.ADVANCES IN WATER RESOURCES,168.
MLA	Pozdniakov, Sergey P.,et al."Analysis of a steady-state model of groundwater discharge in a river valley without and with evapotranspiration".ADVANCES IN WATER RESOURCES 168(2022).