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| 1 | A Review of Colloid Transport in Fractured Rocks显示文摘Recent recognition of colloid and colloidassociated transport of strongly sorbing contaminants in fractured rocks highlights the importance of exploring the transport behavior of colloids under conditions prevailing in the field.The rapid transport of colloids through fractured rocks-as affected by the hydraulic properties of the flow system,the properties of fracture surface and the geochemical conditionshas not been sufficiently elucidated,and predictions of colloid transport through fractures have encountered difficulties,particularly at the field scale.This article reviews the current understanding of the mechanisms and modeling of colloid transport and retention in fractured rocks.Commonly used experimental techniques and approaches for conducting colloid transport experiments at different scales,ranging from the laboratory to the field scale,are summarized and commented upon.The importance of various interactions(e.g.,dissolution,colloid deposition,generation,mobilization and deposition of filling materials within fractures) between the flowing solution and the fracture walls(in many cases,with skin or coating on the host rock at the liquid-solid interface) has been stressed.Colloid transport through fractures of high heterogeneity has not yet been well understood and modeled at the field scale.Here,we summarize the current knowledge and understanding accumulated in the last two decades in regard to colloid and colloidassociated transport through fractures.Future research needs are also discussed. | ZHANG Wei TANG Xiangyu WEISBROD Noam GUAN Zhuo | 2012 | Journal of Mountain Science2012，9，6： | 12 |
| 2 | 裂隙介质水流与溶质运移数值模拟研究综述显示文摘在介绍裂隙介质中的水流运动及裂隙介质溶质运移规律的基础上,总结了多种用于概化裂隙岩体的模型及数值方法,介绍了各模型相应的模拟软件如TOUGH2与FRSCMAN的发展及应用,指出裂隙介质中地下水运动及溶质运移数值模拟研究仍处于探索阶段,方法与技术均不成熟,机理研究、数值模拟方法等方面有待进一步发展。 | 王礼恒 李国敏 董艳辉 | 2013 | 水利水电科技进展2013，33，4： | 12 |
| 3 | 大理石平板裂隙水运移实验与模拟研究显示文摘为了揭示单个裂隙中水流和溶质运移的规律,该文选取大理石平板作为实验介质,开展了平板裂隙水运移实验,分析了水力梯度和水流速度之间的关系,研究了溶质运移规律;利用连续时间随机步长(CTRW)软件包中的截断幂函数(TPL)模型对溶质浓度穿透曲线进行了模拟,并与传统的对流-弥散方程(ADE)模拟结果进行了对比。结果表明:实验条件下,大理石平板裂隙水流为非达西流,利用Forchheimer方程可以更好地模拟;大理石平板裂隙内溶质运移为no-Fickian运移,表现出明显的拖尾现象;在不同流速条件下模拟溶质穿透曲线时,利用TPL模型拟合结果明显优于ADE模型。 | 严小三 钱家忠 陈冰宇 马雷 周小平 | 2014 | 水动力学研究与进展(A辑)2014，29，5： | 6 |
| 4 | EFFECT OF A MOVING BOUNDARY ON THE FLUID TRANSIENT FLOW IN LOW PERMEABILITY RESERVOIRS显示文摘In a low permeability reservoir, the existence of a moving boundary is considered in the study of the transient porous flow with threshold pressure gradient. The transmission of the moving boundary directly indicates the size of the drainage area as well as the apparent influences on the pressure behavior. The nonlinear transient flow mathematical model in which the threshold pressure gradient and the moving boundary are incorporated is solved by advanced mathematical methods. This paper presents some new analytical solutions describing the pressure distribution at a constant rate and the production decline in a constant pressure production with the boundary propagation. It is shown that the greater the threshold pressure gradient, the slower the transmission of the moving boundary, the larger the pressure loss will be, and there is no radial flow in the middle and later phases of the wellface pressure for a well at a constant rate. We have the the maximum moving boundary at a specific drawdown pressure for a low permeability reservoir. The greater the threshold pressure gradient, the smaller the maximum moving boundary distance, the quicker the production decline for a well in a constant pressure production will be. The type curve charts for the modern well test analysis and the rate transient analysis with a moving boundary are obtained and the field test and the production data are interpreted as examples to illustrate how to use our new results. | LUO Wan-Jing WANG Xiao-dong | 2012 | Journal of Hydrodynamics2012，24，3： | 3 |
| 5 | Improvement of numerical simulation of bimolecular reactive transport using time-dependent parameters显示文摘The overestimation of the contaminant concentration is a main issue in simulating the reactive transport using the common advection-dispersion-reaction equation(ADRE). To solve this problem, a new modeling method is developed. The parameters of the model are identified based on experimental data. The results of the model are compared with previous results in the literature, and the sensitivity of the model is analyzed by examining the model's response to changes of the model parameters. Main conclusions are as follows:(1) The numerical modeling approach is feasible with an improved simulating accuracy. The predicted values are in agreement with the experimental measurements. The relative errors of the peak concentration between the simulated and experimental values are less than 2.5%. The errors are greatly reduced as compared with the results(about 67.8% as the maximum) based on a traditional ADRE in the literature.(2) There are three parameters( m, 0 and D) which can be calibrated on the basis of experimental data in the model. The reactive product concentrations are mainly influenced by the parameters involved in the reactive ratio such as m and 0. The hydrodynamic dispersion coefficient D has almost no influence on the reactive product transport.(3) Our model does not provide better fitting curves for the 'early arrival' and the 'long tail'. The 'early arrival' and the 'long tail' are associated with low values of the product AB. Under these conditions, the reaction rate is close to 0, and the model of the ADRE reduces to the advection-dispersion equation(ADE). Further mechanism study is needed in the future. | 刘咏 钱家忠 马雷 赵卫东 骆乾坤 | 2015 | Journal of Hydrodynamics2015，27，1： | 2 |
| 6 | 基于自然电位的充填裂隙溶质运移特征试验研究显示文摘为精细描述充填裂隙溶质运移过程及其特征,设计加工了充填裂隙溶质运移试验模型,开展了不同流速条件下溶质运移试验,研究了充填裂隙溶质运移特征,结合不同测点自然电位(SP)实时动态监测数据,研究充填裂隙内部溶质运移过程。结果表明:1)在试验流速0.0733~0.9630 mm/s范围内,充填裂隙渗透系数为1.85 mm/s,与充填多孔介质渗透系数1.79 mm/s较为接近,水流符合达西定律。2)试验过程中,水流实际平均流速为0.247、0.431、0.661 mm/s时,取样口处溶质峰值浓度分别为5.14、5.50、5.78 g/L,溶质初始到达和峰值到达时间均减少,其中初始到达时间分别为4640、2640、1560 s,峰值到达时间分别为5480、3360、2040 s。3)3种水流实际流速条件下,溶质运移过程中SP响应呈现出相似特征,沿水流方向从1^#到6^#测量电极处峰值SP绝对值逐渐减小,且峰值前SP响应曲线陡峭程度逐渐降低;此外,溶质弥散前锋与溶质弥散峰值浓度点随水流动均呈匀速运移状态,其中溶质弥散前锋相应的平均流速分别为0.214、0.396、0.685 mm/s,溶质弥散峰值相应的平均流速为0.189、0.347、0.571 mm/s。4)基于峰值SP计算的水流实际平均流速与采用溶质峰值浓度计算结果基本一致,但基于峰值SP计算结果更接近实际平均流速(流量计算结果),准确度提高1.5%;随着流速不断增加,采用峰值SP计算的宏观平均流速误差降低9.9%。5)试验发现,与峰值SP值相比,采用初始SP值计算的充填裂隙水流宏观平均流速更接近由流量数据计算的水流宏观平均流速。 | 姜春露 汪根强 郑刘根 徐康 程桦 | 2020 | 工程科学与技术2020，52，4： | 2 |
| 7 | 边界层对粗糙单裂隙溶质运移影响试验显示文摘为探究非费克(non-Fickian)运移表现出的峰值提前到达和拖尾等现象,开展了粗糙单裂隙溶质运移试验,总结了粗糙单裂隙中溶质运移特征及运移机理,结合边界层理论对峰值提前到达和拖尾现象进行了分析和解释。结果表明:峰值时间和拖尾时间与边界层厚度之间存在较好的线性相关关系;边界层对裂隙介质溶质运移有较为显著影响,即水流速度越小,边界层厚度越大,滞留在边界层内部的溶质越多,溶质获取率越低;粗糙单裂隙中溶质穿透曲线的峰值提前和拖尾现象是由裂隙中心处以惯性力主导的主流区和裂隙壁面以黏性力主导的边界层区共同作用造成的,其中峰值时间主要由主流区的对流因素控制,而边界层区域的存在对拖尾时间影响较大。 | 田峥颖 陈舟 马兴 杜昭颖 金敏 | 2023 | 河海大学学报(自然科学版)2023，51，2： | 0 |
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