摘要
应用物理非平衡CDE模型能够模拟岩溶区示踪剂穿透曲线(TBCs)从而获取岩溶管道水文地质参数。相对传统模型而言,该模型将岩溶管道内液体分为流动区域和非流动区域,更能体现岩溶管道的非均质性和穿透曲线的拖尾现象。本次研究通过自动监测示踪剂浓度和流量变化绘制穿透曲线并结合QTRACER2程序计算模型所需参数初始值,确定示踪试验回收率,并应用物理非平衡CDE模型模拟岩溶管道内平均速度、弥散系数、两区间分配系数和质量交互系数。最后通过不同距离处示踪剂穿透曲线对比发现平均速度和弥散系数随距离的增大而增大,具有明显的尺度效应,而分配系数和质量交换系数基本不变。为降低尺度效应的影响,本文采用算数平均计算速度和弥散系数。
A physical nonequilibrium CDE model is used to simulate tracer-breakthrough curves（TBCs）to obtain hydrogeological parameter of karst conduit.Contrast with traditional model,the fluid is divided into mobile and immobile fluid regions in this model which could reflect effectively the heterogeneity of karst conduit and the tails associated with TBCs.The tracer recovery is confirmed and the TBCs are obtained by automatic monitoring of concentration and changes of flow.The initial parameters are calculated by QTRACER2 program.The hydrogeological parameters such as average velocity,dispersion coefficient,partitioning coefficient and mass transfer coefficient is simulated by physical nonequilibrium CDE model.By comparing the BTCs of different distances,it is found that the mean velocity and dispersion coefficient is becoming greater with distance increases presenting a scale effect obviously.In order to reduce the impact of scale effect,the arithmetical average is used to calculate the velocity and dispersion coefficient.
出处
《工程勘察》
2014年第9期56-59,共4页
Geotechnical Investigation & Surveying
基金
国家科技计划项目(1212011220959)
中国地质科学院岩溶地质研究所所控项目(2014018)资助
关键词
非平衡CDE
岩溶管道流
穿透曲线
示踪试验
nonequilibrium CDE
karst conduit
tracer-breakthrough curves（TBCs）
tracer test
