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Comparison of Two Computational Methods for Estimating Transmissivity Based on the Picking Equation
Ground Water ( IF 2.6 ) Pub Date : 2020-01-10 , DOI: 10.1111/gwat.12972
A. Mills 1
Affiliation  

A comparison is presented of two computational methods, PICKINGmodel and PPC‐Recovery, to estimate transmissivities based on the Picking equation using water‐level recovery data from brief pumping tests of relatively low‐yielding domestic wells. The tests were performed by the United States Geological Survey (USGS) in 50 domestic bedrock wells in south‐central New York State, and USGS staff performed the analysis using PICKINGmodel based on the Picking equation. The results indicated that the estimated transmissivities ranged from 0.86 to 2900 ft2/d (0.080 to 270 m2/d) with a median of 41 ft2/d (3.8 m2/d). The same data were later analyzed using PPC‐Recovery also based on the Picking equation. The two sets of estimated transmissivities were compared and statistically had the same median value at a probability of 95%. In another analysis, the PPC‐Recovery method was applied to the same data that had been truncated at the point when the slope of the recovery data curve began to deviate from a straight line aligned with the middle portion of the recovery data. Comparing these resulting estimates of transmissivity with values originally obtained using the PICKINGmodel, the two had statistically the same median value for transmissivity at a probability of 95%. It was concluded that using PPC‐Recovery in this manner to estimate transmissivity in low‐yielding domestic wells will yield transmissivity values sufficiently close to the results had PICKINGmodel been used, and with less time and effort.

中文翻译:

基于Picking方程的两种估算透射率的计算方法的比较

提出了两种计算方法PICKINGmodel和PPC-Recovery的比较,以使用来自相对低产家庭井的简短抽水测试中的水位恢复数据,基于Picking方程估算透射率。测试是由美国地质调查局(USGS)在纽约州中南部的50座家庭基岩井中进行的,USGS员工使用基于Picking方程的PICKING模型进行了分析。结果表明,估计的透射率范围为0.86至2900 ft 2 / d(0.080至270 m 2 / d),中位数为41 ft 2 / d(3.8 m 2/ d)。后来也根据Picking公式使用PPC-Recovery分析了相同的数据。对两组估计的透射率进行比较,并在统计学上以95%的概率具有相同的中值。在另一分析中,将PPC-Recovery方法应用于在恢复数据曲线的斜率开始偏离与恢复数据的中间部分对齐的直线时已被截断的相同数据。将这些透射率的最终估计值与最初使用PICKING模型获得的值进行比较,二者在统计学上具有相同的透射率中值,概率为95%。
更新日期:2020-01-10
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