大坝上游河岸带非均质含水层溶质运移模拟

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关键词：大坝上游；河岸带；非均质性；沉积特征；超扩散溶质运移；数值模拟中图分类号：P641.2 文献标志码：A 文章编号：1672-1098（2025）06-0041-09

Simulation of Solute Transport in Heterogeneous Aquifers of the Riparian Zone Upstream of Dams LI Xu1，2 ，LIU Han1²， WEN Zhang^，DAI Xin12，LI Yiming³， ZHANG Haitao1.2

（1.School ofEarthandEnvironment，Anhui Universityof Scienceand Technology，Huainan Anhui 2320ol，China; 2.State Key LaboratoryofDeepCoalMiningandEnvironmentProtection，AnhuiUniversityofScienceandTechnology，HuainanAnhui 232001，China; 3.SchoolofEnvironment Studies，China UniversityofGeosciences，Wuhan Hubei 43o074，China）

Abstract： Objective This study aims to investigate the controlling mechanism of aquifer heterogeneity on solute transport in the riparian Zone upstream of a dam under operational conditions.Methods Based on a series of borehole measurement data from the Xinglong Dam area on the Han River， T-PROGS （Transition Probability Geostatistical Software） was used to characterize the sedimentary characteristics of the area. Subsequently， Subsequently，a random two-dimensional heterogeneous aquifer model of the riparian zone was constructed by using the obtained sedimentary architecture.The transport processof solutes in the riparian aquifer was simulated by means of MODFLOW and MT3D modules， and the impact of sedimentary lengths and thicknesses on heterogeneous solute transport was investigated. Results Itis indicated that the proportions of clay，silt，fine sand， and silty clayinthestudyarea areO.33，0.27，0.09，and0.31，respectively，with sedimentarythicknesesof3.68， 2.34，2.10，and 3.40 meters，respectively.The sedimentary lengths are ten times the thicknesses.Conclusion An increase in sedimentary length leads toan increase in solute transport velocity and distance，resulting in an extended solute plume front. Conversely，an increase in sedimentary thickness reduces the solute transport velocity and distance，causing a contraction of the plume front. Overall，the riparian Zone upstream of the dam exhibitssignificant heterogeneity.The distinct sedimentary architecturescreate combinations of preferential pathways and low-permeability zones， leading to varying degrees of super-difusive solute transport phenomena.

Key words： upstream of the dam; riparian Zone; heterogeneity; sedimentary characteristics； super-difusive transport; numerical simulation

河岸带（riparianzone）是陆地与水体之间的重要过渡区域，具有一定的生态边界，在调控水质、维持物种多样性和防正土壤侵蚀等方面发挥重要作用[1]。（剩余9637字）