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定量评价地表水地下水转化关系是管理和利用流域水资源的基础。通过在卫宁平原沿河采集36组地表水、地下水样品,基于水化学和氢氧稳定同位素特征分析了地下水和黄河的转化关系。建立了一维溶质对流运移方程并运用有限差分法求解,以Cl-和EC为拟合指标计算了地下水沿河排泄强度。结果表明:枯水期地下水以向黄河泄流为主,总排泄量为7.48m3/s,占黄河流量的2.13%。地下水排泄具空间变异,存在两段地下水强排泄区。水化学示踪模拟方法可以有效评价地下水沿河排泄及其空间变异,地下水样品的代表性、水量均衡要素的完备性和取样密度是影响评价精度的主要因素。
The quantitative evaluation of surface water conversion is the basis for the management and utilization of water resources in the basin. Through the collection of 36 sets of surface water and groundwater samples along the Wei-Ning Plain, the conversion of groundwater and the Yellow River was analyzed based on the characteristics of water chemistry and hydrogen-oxygen stable isotopes. A one-dimensional solute transport equation was established and solved by finite difference method. The discharge intensity of groundwater along the river was calculated using Cl- and EC as fitting indexes. The results showed that in the dry season groundwater was mainly discharged to the Yellow River with total discharge of 7.48 m3 / s, accounting for 2.13% of the Yellow River flow. Groundwater discharge with spatial variability, there are two sections of groundwater drainage area. Hydrochemistry tracer simulation method can effectively evaluate the excretion of groundwater along the river and its spatial variability, the representativeness of groundwater samples, the completeness of water balance elements and sampling density are the main factors affecting the evaluation accuracy.