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在淮北平原区五道沟水文水资源试验场,对降雨径流中的氢氧稳定同位素组成变化的特点及控制平原区河道径流组分划分的一些流域水文因素进行了同位素示踪实验研究.结果表明,实验期间降雨中的δ(18O)(-0.918%~-0.518%)及δ(2H)(-5.064%~-2.310%)的变幅较大,并随雨强的降低而增大;1,3,6号测井地下水的δ(18O)(或δ(2H))主要与补给区水源及降雨的δ(18O)(或δ(2H))有关,其对降雨入渗补给的响应较慢,有明显的滞后效应;IR自记井及S4抽水井由于受抽水灌溉等人类活动的持续影响,δ(18O)(或δ(2H))明显偏负,表明有来自深部潜水的补给.此外,流域出口断面河水的δ(18O)(或δ(2H))受平原型流域较强均化作用的影响,其变幅远远小于降雨的δ(18O)(或δ(2H))变幅,在使用同位素方法划分河道径流组分时,需要考虑降雨到形成河道径流的传输时间.
In the Wudaogou Hydrology and Water Resources Experimental Station in Huaibei Plain, isotope tracing experiments were carried out to study the characteristics of the variations of the stable oxygen and nitrogen isotope composition in the rainfall runoff and the hydrological factors in some watersheds that control the river flow components of the plain. The results show that During the experiment, δ (18O) (-0.918% -0.518%) and δ (2H) (-5.064% -2.310%) fluctuated greatly in rainfall, and increased with the decrease of rainfall intensity. Δ (18O) (or δ (2H)) of the 3 and 6 well logs are mainly related to the δ (18O) (or δ (2H)) of the water sources and rainfall in the recharge area, and their responses to rainfall infiltration and replenishment are more (18O) (or δ (2H)) is obviously negatively negative due to the continuous influence of human activities such as pumping irrigation and IR wells and S4 pumping wells, indicating that there are recharges from deep submersion. In addition, the δ (18O) (or δ (2H)) of river waters at the exit section of the river basin is much lower than the δ (18O) (or δ (2H)) of the rainfall by the stronger averaging of the plain basins When using isotope methods to divide stream runoff components, it is necessary to consider the transmission time from rainfall to runoff formation.