| 江汉平原地下水化学特征及水流系统分析 |
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| 引用本文： | 梁杏,张婧玮,蓝坤,沈帅,马腾.江汉平原地下水化学特征及水流系统分析[J].地质科技通报,2020,39(1):21-33. |
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| 作者姓名： | 梁杏 张婧玮 蓝坤 沈帅 马腾 |
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| 作者单位： | 中国地质大学（武汉）环境学院;中国地质大学（武汉）生物地质与环境地质国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目41772268中国地质调查局项目12120114069301中国地质调查局项目121201001000150121 |
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| 摘 要： | 江汉平原水质性缺水问题日益突出,识别江汉平原地下水流系统分布模式,对地下水资源的合理利用与保护具有重要意义.选取江汉平原典型区域,综合水文地质条件、水动力场及水化学同位素指标深入分析地下水补给过程、水岩作用及滞留时间.得出由于碳酸盐岩的溶解,研究区的地下水化学类型属于HCO3-Ca (Mg)型.地下水中典型离子随深度增加逐渐降低,同位素随深度增加逐渐偏负,表现出地下水流系统呈局部与区域水流系统的特点,系统深度界限在10~20m.独立而复杂的局部水流系统在平枯水期地下水向河渠地表水排泄.根据3H的含量,局部水流为现代水,水循环交替迅速.受地形控制,中深层地下水总体由西和西北向东和东南径流,汇入汉江和长江,为区域水流系统.由于补给源的高程效应,区域水流的18O值存在明显分区,指示不同的补给来源与水流路径.山前丘陵区基本为现代水,向平原腹地纵深至汉江和长江排泄区,地下水年龄在几百年至6000a不等,水循环交替缓慢.研究发现江汉平原低洼排泄区存在区域水流的顶托补给,可为原生劣质水的分布与聚集研究提供依据.
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| 关 键 词： | 地下水流系统 水文地球化学 河间地块 江汉平原 |
| 收稿时间： | 2019-12-14 |
Hydrochemical characteristics of groundwater and analysis of groundwater flow systems in Jianghan Plain |
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| Liang Xing,Zhang Jingwei,Lan Kun,Shen Shuai,Ma Teng.Hydrochemical characteristics of groundwater and analysis of groundwater flow systems in Jianghan Plain[J].Bulletin of Geological Science and Technology,2020,39(1):21-33. |
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| Authors: | Liang Xing Zhang Jingwei Lan Kun Shen Shuai Ma Teng |
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| Affiliation: | (School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430078,China) |
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| Abstract: | Based on increasingly serious groundwater quality problems in Jianghan Plain, the investigation of groundwater flow systems (GFSs) is vital for the sustainable management and protection of water resources. Hydrogeological conditions, hydrodynamic field and hydrogeochemistry were used to gain insight into the recharge process, water-rock interactions, and groundwater residence time in the typical area of Jianghan Plain. Because of carbonate mineral weathering, groundwater is predominantly of the HCO3-Ca·(Mg) type. The decrease of typical ions and the depletion of isotopic distributions with depth increasing indicate that the GFSs were divided into local and regional GFSs with a depth limitation of approximately 10~20 m. The complex and independent local GFSs exhibit a pattern in which groundwater discharged into surface waters during the nonflood season. Groundwater age of local GFSs is modern according to the 3H concentrations, indicating the hydrodynamic circulation is active. Furthermore, controlled by topography, the regional GFSs flow from west or northwest to east or southeast, eventually discharging into the Yangtze River and the Han River. The evident zonations of δ18O distribution in regional GFSs are dominated by the altitude effect of recharge areas, indicating different recharge sources and flow paths. The piedmont hilly area is basically modern water. Deep into the hinterland of the plain to the discharge area of the Han River and Yangtze River, groundwater age of regional GFSs varied from hundreds of years to 6 000 years estimated by 14C isotope data, elucidating that the hydrodynamic circulation is slow to relatively stagnant. The existence of regional GFSs driven by an upward hydraulic gradient in the low-lying discharge area of Jianghan Plain, can provide a theoretical basis for researching the distribution and aggregation of primary inferior groundwater. |
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| Keywords: | groundwater flow systems hydrogeochemistry interfluve Jianghan Plain |
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