Well hydraulics in pumping tests with exponentially decayed rates of abstraction in confined aquifers
Well hydraulics in pumping tests with exponentially decayed rates of abstraction in confined aquifers
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承压含水层抽水率呈指数衰减的抽水试验中的井水力学
DOI：
10.1016/j.jhydrol.2017.02.046
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发表时间：
2017-05
影响因子：
6.4
通讯作者：
Chen Chen
中科院分区：
文献类型：
--
作者：
Wen Zhang;Zhan Hongbin;Wang Quanrong;Liang Xing;Ma Teng;Chen Chen
实际的现场抽水试验通常涉及可变的抽水速率，这是经典的恒定速率或恒定扬程试验模型无法处理的，并且通常需要一个卷积过程来解释试验数据。在这项研究中，我们提出了一个半解析模型，考虑了在有或没有井筒储存的情况下，以一定（较高）速率开始并最终稳定在一定（较低）速率的指数递减泵速。指数衰减速率泵送试验的一个显著新特征是，在中间泵送阶段的一段时间内，压降会下降，这在恒速率或恒扬程泵送试验中从未出现过。研究发现，与指数衰减泵送速率函数相关的衰减时间曲线由两条速率分别等于启动速率和稳定速率的等速率试验的渐近曲线有界。在没有观察井（单井测试）的情况下进行泵送测试时，必须考虑井筒储存量。基于时间递减曲线的这一特点，提出了一种利用遗传算法估计含水层参数的新方法。
Actual field pumping tests often involve variable pumping rates which cannot be handled by the classical constant-rate or constant-head test models, and often require a convolution process to interpret the test data. In this study, we proposed a semi-analytical model considering an exponentially decreasing pumping rate started at a certain (higher) rate and eventually stabilized at a certain (lower) rate for cases with or without wellbore storage. A striking new feature of the pumping test with an exponentially decayed rate is that the drawdowns will decrease over a certain period of time during intermediate pumping stage, which has never been seen before in constant-rate or constant-head pumping tests. It was found that the drawdown-time curve associated with an exponentially decayed pumping rate function was bounded by two asymptotic curves of the constant-rate tests with rates equaling to the starting and stabilizing rates, respectively. The wellbore storage must be considered for a pumping test without an observation well (single-well test). Based on such characteristics of the time-drawdown curve, we developed a new method to estimate the aquifer parameters by using the genetic algorithm.
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DOI：
10.1111/j.1752-1688.1973.tb05814.x
发表时间：
1973-10
影响因子：
2.4
作者：
R. Lai;G. Karadi;Roy A. Williams
通讯作者：
R. Lai;G. Karadi;Roy A. Williams
影响因子：
5.4
作者：
I. S. Papadopulos;H. H. Cooper-H.
通讯作者：
I. S. Papadopulos;H. H. Cooper-H.
影响因子：
--
作者：
M. S. Hantush
通讯作者：
M. S. Hantush
DOI：
10.1111/j.1752-1688.2004.tb01578.x
发表时间：
2004-10
期刊：
JAWRA Journal of the American Water Resources Association
影响因子：
--
作者：
Z. Şen;Abüsselam Altunkaynak
通讯作者：
Z. Şen;Abüsselam Altunkaynak
影响因子：
4.7
作者：
Z. Wen;Guanhua Huang;Hongbin Zhan
通讯作者：
Z. Wen;Guanhua Huang;Hongbin Zhan