利用222Rn、EC及断面测流分析黑河中游地表水与地下水转换关系

本文以黑河中游为研究对象,采用222Rn、EC及断面测流法对莺落峡至正义峡河段地表水、地下水转化关系进行了分析。结果表明,莺落峡至张掖黑河大桥段为地表水补给地下水,其单长渗漏率为0.248～0.433m3/s.km;张掖黑河大桥至正义峡段为地下水补给地表水,其单长渗出率为0.042～1.057m3/s.km。在相互补给率计算基础上对不同河段不同时段可分别计算相互的补给量,为水资源评价及规划提供科学依据。

ANALYSIS OF CONVERSION RELATION BETWEEN SURFACEWATER AND GROUND WATER IN THE MIDDLE REACHESOF HEIHE RIVER BY MEANS OF222Rn, EC ANDSECTION FLOW MEASUREMENT

After flowing out of Yingluoxia Gorge, Heihe River experiences several conversions of leakage to underground and recharge back to the river. With the aim to study this conversion relation between surface and ground water, 222Rn is employed as the tracer to determine location where ground water discharge and recharge rate, analysis of electrical conductivity (EC) and section flow measurement are used. The measured data show that the surface water leak into the underground at the part from Yinluoxia Gorge to Heihe Bridge in Zhangye, where the leakage rate is 0.248~0.433m3/s.km; but the ground water seep out to the river at the part from Heihe Bridge to Zhengyi Gorge, where the seepage rate is 0.042~1.057 m3/s.km. On the basis of calculation of inter-recharge rate, further the inter-recharge volume could be calculated accordingly in the various reaches and period.