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岩溶多重介质含水系统泉流量特征的研究对岩溶水资源的开发利用具有重要的指导意义。利用自主研发的裂隙-管道介质物理模型,模拟岩溶裂隙-管道介质的泉流量衰减过程,设计多组试验探讨不同因素对泉流量衰减过程的影响。试验结果表明,衰减过程随释水介质的变化分为3个亚动态;衰减系数的大小主要受泉口大小、补给状态、含水介质初始蓄水状态的影响。基于物理试验结果,通过Visual MODFLOW软件结合等效渗透系数法建立符合物理模型机制的水流数值模型,对数值模型进行参数灵敏度分析,研究模型内部结构对泉流量过程的影响。结果表明,排水沟的综合水力传导系数对泉流量过程影响最大,垂直层面裂隙等效渗透系数的影响次之,管道等效渗透系数的灵敏度再次之,泉流量过程对层面裂隙等效渗透系数最不敏感。
The research on the spring flow characteristics of karst multi-media aquifer has important guiding significance for the development and utilization of karst water resources. The self-developed fractured-duct media physical model was used to simulate the flow decay process of karst fissure-pipeline media. Several sets of experiments were designed to explore the influence of different factors on the decay process of spring flow. The experimental results show that the decay process is divided into three sub-dynamics according to the change of water-releasing medium. The size of the attenuation coefficient is mainly affected by the size of the outlet, the recharge status and the initial water storage status of the aqueous medium. Based on the results of physical experiments, the water flow numerical model conforming to the physical model mechanism was established by Visual MODFLOW software combined with the equivalent permeability coefficient method, and the sensitivity analysis of the numerical model was conducted to study the influence of the internal structure of the model on the spring flow process. The results show that the comprehensive hydraulic conductivity of drainage ditch has the greatest influence on the spring flow rate, the second is the influence of the equivalent permeability coefficient of vertical fissure, and the second is the sensitivity of equivalent permeability coefficient of the pipeline. The highest equivalent permeability coefficient Not sensitive.