| 基于CFP的岩溶管道流溶质运移数值模拟研究 |
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| 引用本文： | 杨杨,赵良杰,苏春田,夏日元.基于CFP的岩溶管道流溶质运移数值模拟研究[J].水文地质工程地质,2019,0(4):51-57. |
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| 作者姓名： | 杨杨 赵良杰 苏春田 夏日元 |
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| 作者单位： | 1.中国地质科学院岩溶地质研究所/国土资源部广西岩溶动力学重点实验室,广西 桂林541004；2.中国地质大学(北京)水资源与环境学院, 北京100083 |
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| 基金项目： | 国家自然科学基金项目(41502252)；中央高校基本科研业务费专项经费资助（JYYWF20180402）；中国地质调查局地质调查项目“湘江上游岩溶流域1∶5万水文地质环境地质调查”(DD20160303)；广西基金联合资助培育项目（2018JJA150153） |
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| 摘 要： | 多重岩溶含水介质的复杂性导致岩溶地下水流动及溶质运移的数学模拟成为地下水研究难点之一。为了探讨岩溶多重含水介质中地下水流溶质运移特征，文章构建了管道流CFP水流模型和MT3DMS溶质运移三维耦合数值模型。在阐述管道流CFP和MT3DMS基本原理的基础上，通过建立水文地质概念模型算例（1个落水洞、4个直管道），探讨岩溶管道水流及溶质运移规律，分析讨论不同水文地质参数对浓度穿透曲线的影响。研究结果表明:管道流CFP模型能够刻画岩溶管道与基岩裂隙水流交换特征，MT3DMS模型能够模拟穿透曲线的拖尾现象，符合实际岩溶区特征。随着水力梯度、管道直径及管道渗透系数增大，孔隙度减小，浓度曲线峰值越大，峰值到达时间越快，浓度穿透曲线越对称。得出结论:耦合CFP水流模型和MT3DMS溶质运移模型能够刻画岩溶管道流溶质运移规律，为研究岩溶复杂介质污染物运移特征提供一种思路和途径。
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| 关 键 词： | CFP管道流 溶质运移 浓度穿透曲线 耦合模型 岩溶 |
| 收稿时间： | 2018-09-14 |
| 修稿时间： | 2019-03-22 |
A study of the solute transport model for karst conduits based on CFP |
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| YANG Yang,ZHAO Liangjie,SU Chuntian,XIA Riyuan.A study of the solute transport model for karst conduits based on CFP[J].Hydrogeology and Engineering Geology,2019,0(4):51-57. |
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| Authors: | YANG Yang ZHAO Liangjie SU Chuntian XIA Riyuan |
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| Institution: | 1.Key Laboratory of Karst Dynamics, Ministry of Land and Resources/Guangxi Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, Guangxi541004,China; 2.School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing100083,China |
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| Abstract: | To study the characteristics of solute transport for karst conduits, a coupling method of conduit flow process (CFP) and the modular three-dimentional transport model (MT3DMS) is proposed. For the purpose of probing into the impacts of hydrogeological parameter on solute transport for karst conduits, based on analysis of the fundamentals of CFP and MT3DMS, the authors established the concept model with one sink hole and four conduits. The results of the coupling model show that the CFP model permits the exchange of groundwater between matrix and pipe, and the tailing feature of the breakthrough curve for karst conduits is well depicted. With the decreasing effect from porosity and the increasing effect from pipe diameter and the increasing pipe conductance and hydraulic gradient, the curve peak became larger, and the time to reach the peak becomes quicker and the symmetry of the curve is more apparent. Thus, the coupling model of CFP and MT3DMS can depict the characteristics of solute transport for karst conduits, but cannot simulate the multi-peak curve. How to generalize the physical characteristics of karst conduits is a way to resolve the multi-peak issues. |
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