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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2017-617
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
07 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).
Hydrochemical and isotopic evidences for deciphering conceptual model of groundwater salinization processes in a coastal plain, north China
Dongmei Han 1Key Laboratory of Water Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
2College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract. Groundwater is the important water resource for agricultural irrigation, urban and tourism development and industrial utilization in the coastal region of north China. In the past five decades, coastal groundwater salinization in the Yang-Dai River coastal plain has become more serious than ever before under natural climate change and anthropogenic activities. It is pivotal for the scientific management of coastal water resources to accurately understand groundwater salinization processes and its inducement. Hydrochemical and stable isotopic (δ18O and δ2H) analysis for the different water bodies (surface water, groundwater, geothermal water, and seawater) were applied to provide a better understanding of the processes of groundwater salinization in the Quaternary aquifers. Saltwater intrusion is the major aspect and can be caused by vertical infiltration along the riverbed at the downstream areas of rivers during the tide/surge period, and lateral inflow into fresh aquifer derived from intensively pumping groundwater. Seawater proportion can reach ~ 13 % in the well field. High mineralized geothermal water (TDS up to 10.6 g/L) with the indicator of paleoseawater relics (lower Cl / Br ratios relative to modern seawater) overflows into the cold Quaternary aquifers. Groundwater salinization can also be exacerbated by the anthropogenic activities (e.g., irrigation return-flow with solution of fertilizers, domestic wastewater discharge). Additionally, the interaction between surface water and groundwater can make the groundwater freshening or salinizing in different sections to locally modify the groundwater hydrochemistry. The cease of the well field and establishment of anti-tide dam in the Yang River estuary area have effective function to contain the development of saltwater intrusion. This study can guide the future water management practices, and provide research approaches and foundation for further investigation of seawater intrusion in this and similar region.

Citation: Han, D.: Hydrochemical and isotopic evidences for deciphering conceptual model of groundwater salinization processes in a coastal plain, north China, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-617, in review, 2017.
Dongmei Han
Dongmei Han
Dongmei Han

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Short summary
Based on the hydrochemical and isotopic analysis, we investigated the potential hydrogeological processes responsible for the increasing groundwater salinity in the coastal aquifer of Yang-Dai River coastal plain, north China. Seawater intrusion is the major aspect and can be caused by vertical infiltration along the riverbed at the downstream areas, and lateral inflow into fresh aquifer. Geothermal water also has significant contribution to increasing the groundwater salinity.
Based on the hydrochemical and isotopic analysis, we investigated the potential hydrogeological...
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