| 摘要: |
| 为验证两区模型和变密度模型描述海水入侵过程中溶质运移现象的可行性，先后采用内径为9和11 cm的土柱进行室内稳定流土柱试验，讨论两区模型相比普通CDE模型的优点，以及采用直径10 cm，高300 cm土柱进行溶质运移试验，并应用非均质两区模型和过渡带变密度模型对验证结果作分析比较.采用决定系数和均方误差作为模型验证评价指标，结果表明：两区模型较普通CDE模型能更准确地模拟D9和D11土柱中溶质运移的整个过程.在模型对比土柱试验中两区模型和变密度模型都能很准确地描述溶质运移，说明两区模型在海水入侵模拟试验中存在应用的可能性.在数值模拟过程中同时发现流速基本不变的情形下，随着尺度的增加，溶质运移过程中的弥散系数也增大，且产生尺度效应，故需进一步作室外参数修正. |
| 关键词: 过渡带 海水入侵 两区模型 变密度模型 室内试验 |
| DOI： |
| 分类号:TV139.14 |
| 基金项目:重庆交通大学水利水运工程教育部重点实验室暨国家内河航道整治工程技术研究中心开放基金资助项目：水库大坝深埋隐伏渗漏通道探测与反演研究（SLK2011A02） |
|
| Solute transport test analysis based on the two-region model and variable density model |
|
CHEN Liang1, LI Fei1, HUANG De-wen2
|
|
1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering， Nanjing Hydraulic Research Institute;2.State Key Laboratory of Hydraulic Engineering Simulation and Safety， Tianjin University
|
| Abstract: |
| In order to verify the two-region model and the variable-density model describing the solute transport in transition zone seawater intrusion， the solute transport experiments of the soil columns having diameter of 9 cm and 11 cm and the comparative experiments between the two-region model and the variable-density model have been designed in this study. Taken the determination coefficient and mean square error as model validation evaluation indexes， it is found that the two-region model can describe the solute transport more exactly than the normal CDE model. In the comparative experiments， both the two-region model and the variable-density model can accurately describe the solute transport. So the two-region model can be used in seawater intrusion simulation. According to the numerical simulation it is also found that diffusion coefficient is enlarged with increasing in the size of soil column， and that the two-region model can be used in simulating seawater intrusion to a certain degree with some rectified parameters in the field experiments. |
| Key words: transition zone seawater intrusion two-region model variable-density solute transport model laboratory experiment |
