An alluvial-proluvial fan (APF) has heterogeneous characteristics, which result in the development of imbricated gravel channel networks formed by flow erosion. In this type of aquifer, groundwater flow and solute transport are significantly affected by the connectivity of the channels. This paper investigates the 2D connectivity of a heterogeneous APF aquifer based on a case study of the Dali APF and a physical box numerical model in order to determine how the imbricate gravel channel structures, which have different angles of inclination, influence the flow and solute transport under pumping conditions. Our results indicate that the continuity and connectivity among the imbricated gravels and the imbedded clay lenses of the APF aquifer are the key factor controlling the transport and evolution paths of the plume, while the gravel inclination angles influence the first arrival time, the peak arrival time, and the peak concentration of the downstream observation wells. A smaller gravel inclination angle results in a plume with a larger horizontal range and a smaller vertical range. In contrast, a larger inclination angle causes a later peak arrival time and a longer plume tail. This investigation provides insight into flow and transport within imbricated gravel structures and provides a valuable reference for groundwater risk assessment in similar APF aquifers.

冲积扇（APF）具有非均质特征，这导致了由水流侵蚀形成的砾石状通道网络的发展。在这种含水层中，地下水的流动和溶质的传输受到通道连通性的显着影响。本文基于大理APF的案例研究和物理箱体数值模型，研究了非均质APF含水层的二维连通性，以确定具有不同倾斜角度的盘状砾石通道结构如何影响流动和溶质运移。在抽水条件下。我们的结果表明，APF含水层的砾石和埋层粘土透镜之间的连续性和连通性是控制羽流运移和演化路径的关键因素，砾石倾角会影响下游观测井的首次到达时间，峰值到达时间和峰值浓度。较小的砾石倾角会导致羽流具有较大的水平范围和较小的垂直范围。相反，较大的倾斜角度会导致较晚的峰到达时间和较长的羽状尾巴。这项研究提供了洞察在砾石结构内的流动和运输的方法，并为类似APF含水层中的地下水风险评估提供了有价值的参考。较大的倾斜角度会导致较晚的峰到达时间和较长的羽状尾巴。这项研究提供了洞察在砾石结构内的流动和运输的方法，并为类似APF含水层中的地下水风险评估提供了有价值的参考。较大的倾斜角度会导致较晚的峰到达时间和较长的羽状尾巴。这项研究提供了洞察在砾石结构内的流动和运输的方法，并为类似APF含水层中的地下水风险评估提供了有价值的参考。