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目前同位素技术在水文水资源领域应用非常广泛,也取得了较大的成果,研究地下水同位素对于有效开发利用水资源和预测地下水环境的变化具有重要的意义。根据陇东盆地同位素测试结果,分析盆地地下水同位素分布特征,追溯地下水的来源及运移过程。结果发现:陇东盆地地下水均来源于大气降水,地下水循环具有浅层循环与深层循环两种模式。浅层地下水积极参与现代水循环,可更新能力较强,地貌对地下水径流控制作用明显。深层地下水为古地质时期补给形成的,水交替径流缓慢,可更新能力弱,地下水径流受地质构造控制,从向斜两翼向核部汇集在盆地中部排泄于河流基准排泄面。
At present, isotope techniques are widely used in hydrology and water resources and achieved great results. Studying groundwater isotopes is of great significance for the effective exploitation and utilization of water resources and prediction of the changes of groundwater environment. According to the isotope test results in Longdong Basin, the distribution of groundwater isotopes in the basin is analyzed, and the source and migration of groundwater are traced back. The results showed that all the groundwater in Longdong Basin originated from atmospheric precipitation, and the groundwater circulation had two modes: shallow circulation and deep circulation. Shallow groundwater is actively involved in the modern water cycle with strong renewable capacity and clear topography control of groundwater runoff. Deep groundwater is recharged during the paleogeology period, with slow run-off and weak updatability. Groundwater runoff is controlled by geological structure and converges from the anticlinal wings to the core at the central part of the basin to be drained to the baseline discharge surface of the river.