吉林西部洋沙泡水库高氟水的形成

在调查、分析洋沙泡周边地质、水文地质和氟土壤特征的基础上,结合洋沙泡水库模拟实验结果对吉林西部洋沙泡水库高氟水的形成进行了深入研究。结果表明,吉林西部高氟环境的形成是地表环境长期演化的结果:大兴安岭岩浆岩和松嫩低平原松散沉积物提供了含氟丰富的物质基础,河流及地下水径流提供了氟迁移的动力条件,典型的低平原是高氟形成的地理条件,干旱半干旱的气候条件成为高氟环境的促进条件。洋沙泡的氟主要来源为二龙涛河径流携带,多年平均携带量占年内氟总来源的99%以上;周边径流占0.014%～0.28%;降水携带量占0.012%;蒸发浓缩作用对洋沙泡水库的氟质量浓度也有一定影响。此外,内源底泥的释放也是洋沙泡水库水体氟质量浓度增高的原因之一,并且在引嫩入白工程实施后,依然使洋沙泡水库水体中氟质量浓度增加。在每年引水的情况下,需要5年时间水库水体氟的质量浓度才会降至1.0mg/L以下。风动力和人为活动也对洋沙泡水库的氟质量浓度变化产生影响。

Formation of High-Fluorine Water of Yangshapao Reservoir in Western Jilin Province

The genesis of the high-fluorien water in Yangshapao reservoir was studied on the basis of investigation and analysis of the surrounding geological condition,hydrogeological condition and the characteristics of soil and fluorine as well as the simulating experimental results for Yangshapao reservoir.The results showed that the formation of the high-fluorine area in Yangshapao reservoir is the results of long-term evolution of the surface environment.The magmatic rocks in the Daxing’anling mountain and unconsolidated deposits in Songnen low plain provide abundant fluorine-rich matter.The river and groundwater provides dynamic condition for fluorine transportation.The typical low-lying topology becomes the geographic condition for high-fluorine formation.The dry and semi-dry climatic condition is the promotion condition for the high-fluorine environment.The fluorine in Yanshapao reservoir mainly comes from the runoff of Erlongtao river,which brings about 99% of the total fluorine annually into the reservoir.The fluorine from the surrounding runoff is 0.014%-0.28% annually.The fluorine from the rainout is 0.012%.The evaporation-concentration process can increase the concentration of fluorine in water.The release of fluorine from the bottom mud is one cause of the increase of fluorine concentration in Yangshapao reservoir,which will have some impacts on the water quality of the reservoir after the Water diversion project from Nenjiang river to Baicheng city brings into practice.It will take about 5 years for the fluorine concentration of the water body in the reservoir decreasing below 1.0 mg/L under conditions of annual water diversion.Otherwise,the strong wind and human activities also have impacts on the fluorine in Yangshapao reservoir.