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运用指数 -活塞模型 (EPM) ,将平凉大岔河隐伏岩溶水系统视为线性时不变系统 ,以环境同位素氚作为输入输出信号 ,计算岩溶水系统地下水滞留时间及其他参数
Using the index-piston model (EPM), the concealed karst water system in the Dachahe River in Pingliang is regarded as a linear time-invariant system. Taking the environmental isotope tritium as the input and output signal, the groundwater retention time of karst water system and other parameters