三江平原挠力河干流河水与地下水转化关系分析

Relationship between River Water and Groundwater in the Main Stream of Naoli River in Sanjiang Plain

为了确定三江平原挠力河干流河水与地下水转化关系及转化量,对挠力河干流不同区段、不同时期河水和周边地下水的水化学、δ18O同位素样品进行了分析和定量计算。研究表明:挠力河干流河水与地下水水化学类型相近;两者的同位素数据均分布在当地大气降水线附近,大气降水是主要补给源之一。4月上游及中游区段地下水补给河水,补给比例为77.27%和66.67%,下游河水补给地下水,补给比例38.43%;7月上游地下水补给河水,中上游及中下游河水补给地下水,补给比例为15.04%和11.82%,同时挠力河受到七星河补给,补给比例为32.50%;10月上游及中上游地下水补给河水,补给比例为15.95%,中下游河水补给地下水,补给比例为16.18%,七星河补给挠力河,补给比例为18.99%。说明挠力河干流不同河段河水与地下水的转化关系和转化量具有季节变异性,研究成果可以为合理利用挠力河流域水资源等提供科学依据。

In order to determine the relationship and transformation amount between the main stream of the Naoli River and groundwater in Sanjiang Plain, the hydrochemistry and δ18O isotope samples of river water and surrounding groundwater in different sections and periods of the Naoli River main stream were calculated and analyzed quantitatively. The results show that the main stream of the river is similar to the groundwater. The isotope data of both are distributed near the local precipitation line, which is one of the main replenishment sources. In April, the upstream and middle reaches of the river were replenished with groundwater, accounting for 77.27% and 66.67%, while the downstream groundwater was replenished with river, accounting for 38.43%. In July, the upstream groundwater replenished the river;the upstream and downstream rivers replenished the groundwater;the proportion of replenishment was 15.04% and 11.82%;while the Naoli River was replenished by the Qixing River;the proportion of replenishment was 32.50%. In October, the upstream and middle and upper reaches of the river were replenished by groundwater with 15.95%;the middle and lower reaches of the river replenished groundwater with 16.18%;and the Qixinghe River was replenished by Naoli River with 18.99%. The results of this study can provide scientific basis for rational utilization of water resources in the river basin.