EXPERIMENTAL STUDY OF AIRFLOW INDUCED BY PUMPING TESTS IN UNCONFINED AQUIFER WITH LOW-PERMEABILITY CAP

The airflow in unsaturated soils is an issue of great importance in various fields such as in agricultural, nuclear, environmental engineering. However, up to now, little attention was paid to the generation of the airflow induced by a pumping test in an unconfined aquifer with a low-permeability ca...

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Bibliographic Details
Published in:Journal of hydrodynamics. Series B 2012-09, Vol.24 (4), p.605-608
Main Authors: HUANG, Hui, QIAN, Jia-zhong, KUANG, Xing-xing, CHEN, Zhou, LI, Ru-zhong
Format: Article
Language:English
Subjects:
Airflow
Aquifers
drawdown
Engineering
Engineering Fluid Dynamics
Environmental engineering
Fluid dynamics
Fluid flow
Hydrology/Water Resources
low-permeability cap
Numerical and Computational Physics
Pumping
Pumping rates
pumping tests
Simulation
Soils
unconfined aquifer
实验
承压含水层
抽水试验
气流
潜水含水层
诱发
透气
非饱和土
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Summary:The airflow in unsaturated soils is an issue of great importance in various fields such as in agricultural, nuclear, environmental engineering. However, up to now, little attention was paid to the generation of the airflow induced by a pumping test in an unconfined aquifer with a low-permeability cap and its influence on the pumping test. In this paper, pumping tests were carried out experimentally in the aquifer with a low-permeability cap in order to study the influence of the airflow induced by the pumping on the drawdown of the tests. It is shown that: (1) there is an airflow with negative pressure generated by the pumping tests, (2) the Negative air Pressure (NP) is increased with the pumping rate but decreased with the radial distance, and (3) the NP also changes with the initial water table. The results provide a good basis for further theoretical study of the airflow induced by pumping.
ISSN:1001-6058
1878-0342
DOI:10.1016/S1001-6058(11)60283-7