基于环境同位素技术的河水补给研究——以沈阳黄家傍河水源地为例

河水入渗补给是傍河水源地的主要补给来源,确定河水补给强度对于促进水源地长期安全的开采具有十分重要的意义。以沈阳黄家水源地为研究区,通过对比研究区河水、地下水的水化学及氢氧稳定同位素特征,分析了水源地地下水的补给来源及强度。结果表明:傍河水源地地下水主要接受河水的入渗补给和区域地下水的侧向补给;受河床沉积物和含水介质的岩性及结构在空间上的差异影响,河水入渗补给后在向地下水位漏斗中心流动的过程中具有浅层和深层两条地下水流路径,深层地下水与河水的水力联系更为紧密;河水对地下水的补给强度具有明显的时空变化特点,表现为雨季河水入渗强度明显大于旱季,并且随着与辽河距离的增加,水源地地下水获得的河水补给量呈逐渐减小的趋势。

Research on River Recharge Based on Environmental Isotope Technology: A Case Study of Huangjia Riverside Well Field in Shenyang City

River recharge is a main source of riverside well field, and determining the recharge intensity of groundwater is of great significance for a long-term and safe exploitation of riverside well field. By taking the Huangjia riverside well field as an example,the authors analyzed the hydro-chemical components and the hydrogen and oxygen stable isotope characteristics of river and groundwater by using hydro-chemical technology and environmental isotope technology,and determined the recharge of groundwater and spatial and temporal variation of recharge intensity. The results show that the main recharges of groundwater are river recharge and regional lateral flow recharge. There are two main types of flow path from river to production wells, i.e. shallow flow path and deep flow path. The deep groundwater has a close hydraulic relationship with the river. The recharge from river to groundwater varies significantly in time and space. In terms of temporal variation, the intensity of river water in rainy season is larger than that in dry season; while in spatial variation, the effect of river infiltration declines with the increase of the distance from river bank to pumping wells.