新汴河宿州段地下水—地表水交换量计算

Calculation of Groundwater and Surface Water Quantity Exchange in Suzhou Section of Xinbian River

地下水与地表水存在着一定的水力联系,其交换量计算结果的准确性直接影响流域内水资源量的计算结果。为此,运用氡-222示踪法探明新汴河宿州段不同河段地下水—地表水的水量交互情况并对其交换量进行计算,利用水力学法对氡-222示踪法所得结果进行了验证。结果表明,研究河段地下水地表水水量交换强度自上游断面至下游断面总体呈现先减小后增大趋势,地表水补给地下水水量变化范围为4821×10^(4)~203512×10^(4)m^(3)/a,地下水补给地表水水量变化范围为399×10^(4)~67075×10^(4)m^(3)/a,两种方法的计算结果均表明新汴河右岸以地表水补给地下水为主,左岸以地下水补给地表水为主,氡-222示踪法计算结果较水力学法结果偏小。将传统水力学法与氡-222示踪法结合并互相验证,弥补了单一方法的不足,可为难以获得准确含水层水文地质参数、缺乏长序列水位流量资料的流域水资源评价提供理论方法。

There is a hydraulic connection between groundwater and surface water.The accuracy in calculating the results of the exchange capacity directly affects the results obtained in the calculation of the water resources in the basin.In this paper,the Radon-222 tracer method is used to investigate the interaction of groundwater and surface water in different sections of the Suzhou section of the Xinbian River and its exchange capacity is calculated.The results obtained by the Radon-222 tracer method are verified by hydraulic method.The results show that from the upstream section to the downstream section,the water exchange capacity of surface water in the study reach generally decreases at first and then increases.The amount of surface water recharge varies from 4821 to 203512 ten thousand cubic meters per year,and the amount of surface water recharge varies from 399 to 67075 ten thousand cubic meters per year.The results of the two methods show that the right bank of the Xinbian River is dominated by surface water replenishing groundwater,while the left bank is dominated by groundwater replenishing surface water.The results of Radon-222 tracer method are smaller than those of hydraulic method.The traditional hydraulic method is combined with the Radon-222 tracer method for mutual verification,which makes up for the shortcomings of the single method.This research method can provide a theoretical method for water resources evaluation in a watershed where it is difficult to obtain accurate hydrogeological parameters of aquifer and lack of long series water level and discharge data.