衡水湖湖水与地下水交互关系研究

Research on Interactive Relationship between Lake Water and Groundwater in Hengshui Lake

通过野外采样和室内分析,采用稳定氢氧同位素、水化学、地下水温度场及电导率结合的方法,研究衡水湖地表水与地下水的交互关系。结果表明,沿垂直湖岸方向,由湖岸向四周,地下水水温逐渐降低,电导率逐渐升高;湖水水化学类型为SO_(4)·Cl-Na型,总溶解固体(TDS)含量为0.70~0.76 g/L;地下水水化学类型以SO_(4)·Cl-Na·Mg、Cl·SO_(4)-Na·Mg和Cl·SO_(4)-Na等为主,近湖点水化学类型与湖水相近。TDS含量普遍大于1 g/L,且近湖点含量较远湖点低;其他地表水体水化学类型为Cl·SO_(4)-Na型,TDS含量普遍大于1 g/L;地下水中稳定同位素(δD、δ^(18) O)空间差异明显,近湖点同位素富集,与湖水含量相近,远湖点贫化。该研究结果表明衡水湖湖水与地下水交互关系为湖水渗漏补给地下水,为进一步探究湖水循环机制奠定理论基础。

Through field sampling and indoor analysis,a combination of stable hydrogen and oxygen isotopes,water chemistry,groundwater temperature field and electrical conductivity were used to study the interactive relationship between surface water and groundwater in Hengshui Lake.The results showed that along the direction of the vertical lakeshore,from the lakeshore to the surrounding areas,the groundwater temperature gradually decreased and the electrical conductivity gradually increased.The main hydrochemical type of the lake water was SO_(4)·Cl-Na,and the TDS content was 0.70-0.76 g/L;the main hydrochemical type of the groundwater were SO_(4)·Cl-Na·Mg,Cl·SO_(4)-Na·Mg and Cl·SO_(4)-Na which were similar to the hydrochemical type of lake water.TDS content was greater than 1 g/L,and the content of TDS in the near lake was lower than that of in the far lake;the chemical type of other surface water bodies was Cl·SO_(4)-Na,and the TDS content was generally greater than 1 g/L.The spatial difference of stable isotopes(δD,δ^(18) O)in the groundwater was obvious.The near lake point was enriched,and the content was similar to the lake water,and the far lake point was depleted.The results of this study indicate that the interactive relationship between lake water and groundwater in Hengshui Lake was the replenishment of groundwater by lake water leakage,which provide the theoretical basis to further explore the circulation mechanism of lake water.