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河水-地下水交互带是河水与地下水相互交换和混合的区域,在河流、地下水生态和水质的保护方面具有重要作用.为了解河水-地下水侧向交互带地球化学特征,以重庆市马鞍溪为研究对象,对河水及交互带的水温、溶解氧(DO)、pH值、电导率(EC)进行自动监测,结合对水样离子浓度和交互带沉积物中元素含量的分析.结果表明,马鞍溪侧向交互带水化学类型为HCO_3-Ca·Mg型.监测期间交互带受河水入渗影响为主,交互带的缓冲作用使其温度、DO、pH值、EC等指标变异系数较河水低.随距河岸距离的增加,马鞍溪侧向交互带在物理、化学、生物综合作用下形成了迅速进入缺氧状态的氧化还原环境,以及pH值先降低后升高的酸碱环境.在其影响下,K~+、NH_4~+-N、NO_3~-、SO_4~(2-)呈下降趋势,全Mn、EC、Na~+、Ca~(2+)、Mg~(2+)、Sr~(2+)等先上升后下降,全Fe、Al~(3+)等呈上升趋势.受河水、地下水长期交互影响,在距河岸约30 cm处的交互带沉积物中元素含量较高,形成独特的水化学梯度.据此可推断出马鞍溪侧向交互带边界可能在距河岸30~50 cm处,其中浅层交互带的边界可能在距河岸10 cm左右的位置.在河水补给地下水过程中,河水-地下水侧向交互带对净化水质有重要作用.
The river-groundwater interaction zone is an area where water and groundwater exchange and mix, and plays an important role in the protection of rivers, groundwater ecology and water quality.In order to understand the geochemical characteristics of the river-groundwater lateral interaction zone, Object, the water temperature, DO, pH value and EC of river and interaction zone were monitored automatically, and the analysis of ion concentration in water sample and element content in sediment of interaction zone showed that the water temperature of Ma’angxi The chemical type of lateral interaction zone was HCO_3-Ca.Mg.Effects of water infiltration on the interaction zone during the monitoring period were mainly influenced by the buffer zone interaction, and the coefficient of variation of temperature, DO, pH value and EC index was lower than that of the river. With the increase of the distance from riverbank, the side-interactive belt in Ma’ansi River formed a redox environment rapidly entering hypoxia under the combined effect of physical, chemical and biological processes, and the acid-base environment firstly decreased and then increased, Under the following conditions, K ~ +, NH_4 ~ + -N, NO_3 ~ -, SO_4 ~ (2-) showed a downward trend, all of Mn, EC, Na ~ +, Ca ~ (2 +), Mg ~ (2 + ~ (2+) and so on first rose and then decreased, all Fe, Al ~ (3 +) and so on showed an upward trend by the river, groundwater Period, the elemental contents of the sediments in the interaction zone about 30 cm away from the bank of the river are higher, forming a unique hydrochemistry gradient, and it can be inferred that the boundary of the side chain of the saddle stream may be 30-50 cm away from the river bank , In which the boundary of shallow interaction band may be about 10 cm away from the river bank.In the process of groundwater recharge, the lateral interaction of river water-groundwater plays an important role in the purification of water quality.