Identifying the pattern of shallow groundwater hydrochemistry and its driving factors in a typical estuarine delta of Poyang Lake watershed, China: Insights into water quality assessment

IF 4.7 2区 地球科学 Q1 WATER RESOURCES Journal of Hydrology-Regional Studies Pub Date : 2024-11-05 DOI:10.1016/j.ejrh.2024.102049
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Abstract

Study region

A typical estuarine delta of Gan−Xiu River within Poyang Lake watershed, situated in the north of Jiangxi Province, China

Study focus

Although groundwater is considered as a crucial water resource for social development and public health, it presents significant challenges in preventing the deterioration of groundwater quality in the seasonal floodplain regions. Hence, this study focuses on the spatiotemporal variations of ionic concentrations of shallow groundwater in an estuarine delta of Gan-Xiu River in Poyang Lake watershed, which is greatly complicated by complex hydrological regimes and intensive anthropogenic activities such as cropland fertilizer. The potential factors controlling the ionic concentrations were identified using self-organizing map clustering and Piper diagram approaches. Moreover, the overall water quality of shallow groundwater was assessed according to the ionic compositions.

New hydrological insights for the region

(1) Shallow groundwater chemistry was influenced by weathering silicate and carbonate from ionic and Gibbs plots, which is highly associated with the distribution of the carbonate rock fissure-karst aquifer in the study region. (2) The contribution of groundwater to river water varied from 53.2 % to 71.5 % via isotopic analysis, suggesting that groundwater dominate the component of river water. (3) Most samples from cluster types are suitable for drinking and irrigation use except for sites from Cluster 6, which were characterized by the higher concentrations of Cl, NO3 and SO42−.
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中国鄱阳湖流域典型河口三角洲浅层地下水水化学模式及其驱动因素识别:对水质评估的启示
研究区域中国江西省北部鄱阳湖流域内典型的赣秀河口三角洲研究重点虽然地下水被认为是社会发展和公共卫生的重要水资源,但在防止季节性洪泛区地下水水质恶化方面却面临着巨大挑战。因此,本研究重点关注鄱阳湖流域赣秀河口三角洲浅层地下水离子浓度的时空变化。利用自组织图聚类法和 Piper 图法确定了控制离子浓度的潜在因素。对该地区水文的新认识(1)从离子图和吉布斯图来看,浅层地下水化学受风化硅酸盐和碳酸盐的影响,这与研究地区碳酸盐岩裂隙-喀斯特含水层的分布高度相关。(2) 通过同位素分析,地下水占河水的比例从 53.2%到 71.5%不等,表明地下水在河水成分中占主导地位。(3) 除了第 6 组的样本具有较高的 Cl-、NO3- 和 SO42-浓度外,其他组群类型的样本大多适于饮用和灌溉。
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来源期刊
Journal of Hydrology-Regional Studies
Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.70
自引率
8.50%
发文量
284
审稿时长
60 days
期刊介绍: Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.
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