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Correct Delineation of Capture Zones Using Particle Tracking under Transient Conditions

机译:在瞬态条件下使用粒子跟踪正确地描述捕获区域

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摘要

The shape and size of capture zones delineated by reverse particle tracking in transient models can depend on the starting time of the particles. This effect arises because of temporal changes in the velocity field caused by time-variant parameters such as recharge and pumping rates. Particles started at any one time step may not "encounter" the transient changes in the flow field. This effect can be particularly important in fractured aquifers, where low values of storativity can mean rapid, short-term changes in the flow or velocity field from recharge or pumping changes. Delineating a capture zone based on particles started in the last time step of the last stress period in a transient model can dramatically underestimate or overestimate its true extent. The correct method of delineating capture zones in transient models is to release particles at all the time steps of all stress periods. The union of all of the capture zones resulting from this process is the actual capture zone.
机译:在瞬态模型中,通过反向粒子跟踪描绘的捕获区域的形状和大小可能取决于粒子的开始时间。之所以出现这种效果,是因为速度场的时间变化是由时变参数(例如补给和泵速)引起的。在任何一个时间步长启动的粒子都可能不会“遇到”流场中的瞬态变化。这种影响在破裂的含水层中尤其重要,在该含水层中,低的储藏率可能意味着补给或抽水变化引起流场或速度场的快速短期变化。根据瞬态模型中最后一个应力周期的最后一个时间步中开始的粒子来描述捕获区域,可能会大大低估或高估其真实范围。在瞬态模型中描绘捕获区域的正确方法是在所有应力周期的所有时间步长释放颗粒。此过程导致的所有捕获区域的并集是实际捕获区域。

著录项

  • 来源
    《Ground water》 |2014年第3期|332-334|共3页
  • 作者单位

    Department of Geosciences, Hamilton College, Clinton, NY 13323;

    Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension, Madison, WI;

    Department of Geological Sciences, University of Alabama, Tuscaloosa, AL ,Department of Energy and Resources Engineering, College of Engineering, Peking University, China;

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  • 正文语种 eng
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