DOI: 10.1038/ngeo2938
论文题名: Groundwater salinity influenced by Holocene seawater trapped in incised valleys in the Red River delta plain
作者: Larsen F. ; Tran L.V. ; Van Hoang H. ; Tran L.T. ; Christiansen A.V. ; Pham N.Q.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 5 起始页码: 376
结束页码: 381
语种: 英语
Scopus关键词: aquifer
; borehole
; brackish water
; freshwater
; groundwater flow
; groundwater resource
; Holocene
; leaching
; marine sediment
; permeability
; Pleistocene
; porewater
; salinity
; sea level
; seawater
; sediment transport
; Red River Delta
; Viet Nam
英文摘要: Salty and brackish groundwater has been observed at least 100 km inland in some aquifers contained within Quaternary delta plains. This phenomenon limits access to fresh groundwater resources, particularly in the densely populated deltas of Southeast Asia. However, the causes of inland salinity are unclear. Here we present borehole and geophysical data that show that in the Red River delta plain of Vietnam, salty and brackish groundwater primarily occurs in incised valleys that were formed during sea-level lowstands during the Pleistocene. During the mid-Holocene, these valleys were filled with fine-grained marine deposits containing trapped seawater. We conduct groundwater flow simulations that show that the age, thickness, and permeability of the marine sediments are the primary controls on the leaching of salty porewater into the freshwater aquifer. We find that salty groundwater originating from this trapped seawater is still present in Holocene-aged sediments with low permeability, and affects groundwater salinity in adjacent aquifers. In contrast, trapped seawater from all Pleistocene-aged sediments has been leached. We identify a number of brackish to saline delta aquifers elsewhere in Asia and throughout the world that have a similar sedimentary history, and thus are likely to be influenced by this leaching process. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105796
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Geological Survey of Denmark and Greenland, ster Voldgade 10, Copenhagen, Denmark; Hanoi University of Mining and Geology, Department of Hydrogeology, Hanoi, Viet Nam; Hanoi University of Science, Department of Geology, Hanoi, Viet Nam; Department of Geoscience, Aarhus University, Hegh-Guldbergs Gade 2, Aarhus, Denmark; Hanoi University of Natural Resources and Environment, Hanoi, Viet Nam
Recommended Citation:
Larsen F.,Tran L.V.,Van Hoang H.,et al. Groundwater salinity influenced by Holocene seawater trapped in incised valleys in the Red River delta plain[J]. Nature Geoscience,2017-01-01,10(5)