Civil and Environmental Engineering Department, University of Massachusetts, Amherst, MA 01003, USA.
Ground Water. 2010 Jul-Aug;48(4):609-13. doi: 10.1111/j.1745-6584.2010.00706.x. Epub 2010 Apr 26.
We extend Bouwer and Rice (1976) slug test theory to incorporate background head trends that may be important in incompressible material of low permeability k. The extension, which features a convolution integral of the background head, is closed form for linear trends. A sensitivity study suggests that a rising background head can diminish the head changes associated with a slug-out test and underestimate k if it is ignored, as does falling background trend with a slug-in test. A falling background head can reinforce slug-in test head change and, if ignored, can overestimate k, as does a rising background head with a slug-out test. The simple extension is verified by field tests in glacial till and stratified drift deposits in eastern Massachusetts.
我们将 Bouwer 和 Rice（1976 年）的柱塞测试理论扩展到包含可能在低渗透率 k 的不可压缩材料中很重要的背景水头趋势。该扩展通过对背景水头的卷积积分，为线性趋势提供了封闭形式。敏感性研究表明，如果忽略上升的背景水头，它会减小与柱塞排出测试相关的水头变化并低估 k，而柱塞进入测试中下降的背景趋势也是如此。下降的背景水头可以增强柱塞进入测试的水头变化，如果忽略不计，会高估 k，而柱塞排出测试中上升的背景水头也是如此。这种简单的扩展在马萨诸塞州东部的冰川堆积物和层状漂移沉积物中的现场测试中得到了验证。
