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Analytical Study of Unsteady Nested Groundwater Flow Systems

机译：非稳态嵌套式地下水流系统的分析研究

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摘要

Two analytical solutions using segregation variable method to calculate the hydraulic head under steady and unsteady flow conditions based on Toth's classical model were developed. The impacts of anisotropy ratio, hydraulic conductivity (K), and specific yield (mu(s)) on the flow patterns were analyzed. It was found that the area of the equal velocity region increases and the penetrating depth of the flow system decreases at steady state with anisotropy ratio increases, which is defined as epsilon = root K-x/K-z. In addition, stagnant zones can be found in the flow field where the streamlines have opposite directions. These stagnant zones move toward the surface as the horizontal hydraulic conductivity increases. The results of the study on transient flow indicate that a relative increase in hydraulic conductivity produces a positive impact on hydraulic head and a relative enhancement in specific yield produces a negative effect on hydraulic head at early times.
机译：基于Toth的经典模型，开发了两种使用偏析变量法计算水力压头的解析解。分析了各向异性比，水力传导率（K）和比产率（mu（s））对流型的影响。研究发现，在稳态时，等速区域的面积增加，流动系统的穿透深度减小，且各向异性比增加，其定义为ε=根K-x / K-z。此外，在流场中流线方向相反的地方会出现停滞区。随着水平水力传导率的增加，这些停滞区域向地面移动。对瞬态流量的研究结果表明，水力传导率的相对增加对液压头产生了积极的影响，比产率的相对提高在早期对水头产生了负面的影响。

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  • 来源
    《Mathematical Problems in Engineering》 |2015年第19期|284181.1-284181.9|共9页
  • 作者

    Niu Hong; Liang Xing; Ni Sheng-nan; Wen Zhang;

  • 作者单位

    China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

    China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China|China Univ Geosci, Sch Environm Studies, Hubei Key Lab Wetland Evolut & Ecol Restorat, Wuhan 430074, Peoples R China;

    Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China;

    China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China;

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