Effects of Downward Intrusion of Saline Water on Nested Groundwater Flow Systems

Zhang，Xiaolang1,2; Jiao，Jiu Jimmy1; Li，Hailong2,3; Luo，Xin1; Kuang，Xingxing2,3

2020-10-01

10.1029/2020WR028377

WATER RESOURCES RESEARCH   影响因子和分区

0043-1397

1944-7973

Nested groundwater flow systems (NGFS) are commonplace in various hydrogeological environments, including endorheic basins and coastal aquifers. The subsystems of the NGFS can be spatially separated by streamlines around the internal stagnation points. At the discharge zones of the topographic depressions, saline water often emerges due to high evaporation in endorheic drainage basins or the combined effects of evaporation and intermittent seawater submersion in coastal areas. To date, there are limited studies that have considered the impact of local-scale downward migration of saline plumes in the topographic depressions on the NGFS. In this study, the classic NGFS are revisited by considering saline water in their discharge zones. To quantify the effects of salinity in the discharge zones on the NGFS, scenarios of various salinities in the discharge zones are simulated. The displacements of the internal stagnation points are used to quantify the evolution of the NGFS in response to salinity changes in the discharge zones. The results show that, as the salinity in the discharge zones increases, the hydraulic gradient near the discharge zone can be significantly reduced, the internal stagnation points shift upward, and the local groundwater flow systems retreat upward so that their original spaces are replaced by intermediate or regional flow systems. The discharge zone is expanded, and the overall groundwater flow velocity magnitude of the entire system decreases with salinity. This study may shed light on the management of saline wetlands, for example, the control of groundwater salinization, evolution of saline groundwater basins, and seawater intrusion.

density-dependent flow groundwater flow systems saline water downward intrusion

SCI ; EI

英语

其他

National Natural Science Foundation of China[41572208][91747204] ; Research Grants Council of Hong Kong[HKU 17304815]

Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources

Environmental Sciences ; Limnology ; Water Resources

WOS:000586456800026

AMER GEOPHYSICAL UNION

20204409404991

Groundwater resources ; Salt water intrusion ; Catchments ; Coastal zones ; Seawater ; Evaporation ; Flow velocity ; Groundwater flow ; Hydrogeology

Water Resources:444 ; Groundwater:444.2 ; Marine Science and Oceanography:471 ; Seawater, Tides and Waves:471.4 ; Geology:481.1 ; Fluid Flow:631 ; Fluid Flow, General:631.1 ; Chemical Operations:802.3 ; Mechanical Variables Measurements:943.2

ENVIRONMENT/ECOLOGY

2-s2.0-85093872862

Scopus

1.Department of Earth Sciences,University of Hong Kong,Hong Kong
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China
3.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,China

Zhang，Xiaolang,Jiao，Jiu Jimmy,Li，Hailong,et al. Effects of Downward Intrusion of Saline Water on Nested Groundwater Flow Systems[J]. WATER RESOURCES RESEARCH,2020,56(10).

Zhang，Xiaolang,Jiao，Jiu Jimmy,Li，Hailong,Luo，Xin,&Kuang，Xingxing.(2020).Effects of Downward Intrusion of Saline Water on Nested Groundwater Flow Systems.WATER RESOURCES RESEARCH,56(10).

Zhang，Xiaolang,et al."Effects of Downward Intrusion of Saline Water on Nested Groundwater Flow Systems".WATER RESOURCES RESEARCH 56.10(2020).