| 左江中游岩溶峰林区河流交互带水化学特征与控制因素 |
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| 引用本文： | 黄奇波,覃小群,程瑞瑞,李腾芳.左江中游岩溶峰林区河流交互带水化学特征与控制因素[J].水文地质工程地质,2019,0(5):1-8. |
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| 作者姓名： | 黄奇波 覃小群 程瑞瑞 李腾芳 |
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| 作者单位： | 1.中国地质科学院岩溶地质研究所，广西 桂林541004；2.自然资源部广西岩溶动力学重点实验室，广西 桂林541004;3.中国地质大学（武汉）环境学院，湖北 武汉430074 |
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| 基金项目： | 中国地质调查局地质调查项目（DD20160301）；国家自然科学基金项目（41571203） |
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| 摘 要： | 岩溶交互带是连接岩溶含水层与地表河流的重要通道，对河流和地下水水质具有重要的保护作用。本研究选取左江中游岩溶峰林区河流交互带为研究对象，在丰水期（8月下旬）和平水期（10月下旬）对交互带内机井的水化学进行现场测试分析，并结合地下水流动系统理论探讨左江两侧岩溶交互带空间分布特征和控制因素。研究结果表明:左江水的电导率(EC)较小、Ca2+、HCO-3浓度较低，两岸机井中增高；pH、温度、DO的变化则相反，呈现出左江高，两岸机井中降低；交互带内形成了具有DO、pH值梯度、温度梯度、Ca2+和HCO-3梯度的混合区。左岸岩溶区补给径流面积大，地下水流动系统范围大，流线密集，岩溶十分发育，形成岩溶管道系统；右岸为左江包围的河间地块，地下水流动系统范围小，补给面积有限，流线稀疏，岩溶发育深度和强度受到限制。左江两岸不同规模的地下水流动系统导致两岸岩溶发育强度明显不同，造成河流交互带范围的巨大差异，左岸的范围大于1 000 m，而右岸的范围在200 m以内，左岸是右岸的5倍以上。本研究有助于左江沿岸地下水的开发利用和水质保护。
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| 关 键 词： | 河流交互带 地下水流动系统 机井 岩溶峰林区 左江 |
| 收稿时间： | 2018-09-10 |
| 修稿时间： | 2018-10-18 |
Hydrochenmical characteristics and control factors of karst hyporheic zones in the karst peak forest region of the middle reaches of the Zuo River |
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| HUANG Qibo,QIN Xiaoqun,CHENG Ruirui,LI Tengfang.Hydrochenmical characteristics and control factors of karst hyporheic zones in the karst peak forest region of the middle reaches of the Zuo River[J].Hydrogeology and Engineering Geology,2019,0(5):1-8. |
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| Authors: | HUANG Qibo QIN Xiaoqun CHENG Ruirui LI Tengfang |
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| Institution: | 1.Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, Guangxi541004, China；2.Institute of Karst Geology, CAGS, Karst Dynamics Laboratory, MLR, Guilin, Guangxi541004, China;3.Environmental School, China University of Geosciences (Wuhan), Wuhan, Hubei430074, China |
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| Abstract: | A karst hyporheic zone is an important channel connecting a karst aquifer and a river, which plays an important role in protecting the ecology and water quality in both of river water and groundwater. In order to study the geochemical characteristics of the karst hyporheic zone in the middle reach of the Zuo River, water temperature, dissolved oxygen, pH and electrical conductivity of 21 water samples from the Zuo River (5 samples), ground water (3 samples) and motor-pumped well (13 samples) were measured. The spatial distribution characteristics and control factors of the karst hyporheic zone on both sides of the Zuo River are discussed by applying the flow system theory of karst groundwater. The results show that the the electrical conductivity and concentrations of Ca2+ and HCO-3 of the Zuo River are lower than those observed in the motor-pumped wells in the karst hyporheic zone. On the contrary, the pH values, water temperature and dissolved oxygen in the Zuo River are higher than those observed in the motor-pumped wells, which shows a hydrogeochemical gradient, including a dissolved oxygen gradient, a pH gradient, a temperature gradient, and Ca2+ and HCO-3 gradients in the Hyporheic zone. The recharge-runoff area in the left bank of the Zuo River is large. Due to the larger karst water flow system, the karst is very developed, and the karst pipeline system is formed. Within the right bank, the interstream block is surrounded by the Zuo River. The basin area is about 6 km2, due to the smaller karst water supply area, the karst development depth and intensity is less than that of the left bank. The boundary of the hyporheic zone is more than 1 000 m far away from the river bank in the left bank, whereas the boundary of the hyporheic zone is less than 200 m away from the river bank in the right bank, and the former is five times more than the latter. This study is helpful in the utilization of groundwater and the protection of water quality along the Zuo River |
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