锶-氚-碳同位素在陈家河流域地下水中的应用

Application of strontium-tritium-carbon isotopes in groundwater of Chenjiahe River Basin

为研究陈家河流域酸性煤矿废水的补径排关系,在详细收集以往水文地质等资料的基础上,基于50个采样点(地表水与地下水),50组水样(废弃煤矿出水点、水文井、民井和泉水)的锶、氚、碳同位素化验等数据,结合现场实际情况,利用数理统计等方法,分析陈家河流域锶、氚、碳同位素时空分布特征,并在此基础上结合气象条件、地形、岩性等流域特征,揭示该地区地下水运移补给关系。分析结果表明:研究区主要受大气降水的补给且补给来源较远;地下水处于砂岩裂隙含水系统,并未受碳酸盐岩含水系统的影响,二者相互独立;砂岩裂隙含水岩组与硅酸盐矿物丰富的砂岩裂隙含水介质发生了水—岩相互作用;地下水对主河道特别是下游段的影响较大,可能是由于河道中下游两侧存在着大量的废弃煤矿山,以往煤矿开采的巷道作为优势通道对降水入渗补给进行袭夺,导致地下水与大气降水发生混合。

In order to study the replenishment,runoff,and discharge relationship of acidic coal mine wastewater in Chenjiahe River Basin,based on detailed collection of previous hydrogeological and other data,this study was based on strontium,tritium,and carbon isotope analysis data from 50 sampling points(surface water and groundwater)and 50 sets of water samples(abandoned coal mine discharge points,hydrological wells,civilian wells,and spring water),combined with the actual situation on-site,mathematical statistics and other methods were used to analyze the spatiotemporal distribution characteristics of strontium,tritium,and carbon isotopes in Chenjiahe River Basin.Based on this,combined with meteorological conditions,terrain,lithology and other basin characteristics,the groundwater transportation and replenishment relationship in the region was revealed.The analysis results indicate that:the research area is mainly supplied by atmospheric precipitation and the source of supply is relatively distant;groundwater is located in a sandstone fissure aquifer system and is not affected by the carbonate water-bearing system,and the two are independent of each other;the sandstone fissure water-bearing rock group and the sandstone fissure water-bearing medium rich in silicate minerals undergo water rock interaction;groundwater has a significant impact on the main river channel,especially the downstream section.This may be due to the presence of a large number of abandoned coal mines on both sides of the river channel.Previously,coal mining roadways were used as advantageous channels to capture precipitation infiltration and recharge,leading to the mixing of groundwater and atmospheric precipitation.