摘要
井孔 -含水系统问题是当今水文地质学最重要的研究课题之一。长期以来 ,水文地质模型中对井孔的刻画基本上都是引用“热传导”中的“线汇”理论 ,需要人工预先给定线汇 线源的流量或水头的分配 ,其正确性或适用性至今没有得到理论证明。陈崇希 (1993 )提出的“渗流 -管流耦合模型”和“等效渗透系数”在理论上已解决多个水文地质问题 ,也用于几个实例 ,本文再用物理模拟检验其可靠性。论文针对具有典型意义的河床下水平井或傍河垂直井地下水流问题做了砂槽物理模拟 ,并用基于“渗流 -管流耦合模型”和“等效渗透系数”的数值方法仿真模拟了此条件下地下水流的规律。成果表明 ,数值模拟观测孔水头动态相当好地再现了物理模拟结果。论文指出了“渗流 -管流耦合模型”和“等效渗透系数”在井孔 -含水系统问题上的广泛应用前景。
The question of well-aquifer system is the one of the most important research problems in hydrological sciences. In the past many years, numerous hydrological models used “line-sink ”of “heat conduction” to describe a well. To do so, one needs to determine the discharge or head distribution of the linear sink/source in advance. Up to the present the validity and applicability of such a treatment is not proved rigorously in theory. Chen have presented the idea of a “Seepage-Pipe Coupling Model' and “Equivalent Hydraulic Conductivity' to solve some hydrological problems and applied his method to several real-case examples. This paper uses a physical model to check the reliability of the numerical modeling proposed by Chen. As an example,this paper deals with a horizontal well pumpage underneath a river bed,or a vertical well adjacent to the bank of the river. We use the numerical method of Chen to simulate the groundwater flow pattern of the physical model. The result of the numerical simulation shows that the transient hydraulic heads in the observation wells agree quite well with the experimental results. This paper concludes that the “Seepage-Pipe Coupling Model' and “Equivalent Hydraulic Conductivity' used in well-aquifer system are quite robust in dealing with many well hydraulics problems.
出处
《水文地质工程地质》
CAS
CSCD
2004年第1期1-8,共8页
Hydrogeology & Engineering Geology
基金
中国国家自然科学基金项目 (4 0 172 0 85 )
美国国家科学基金 (DMI BES 990 9964 )资助
关键词
渗流-管流耦合模型
数值模拟
物理模拟
井孔-含水系统
等效渗透系数
非线性流
well-aquifer seepage-pipe coupling model
equivalent hydraulic conductivity
physical modeling
numerical modeling
flow regimes
non-laminar flow
