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EXPERIMENTAL STUDY OF AIRFLOW INDUCED BY pumping tests IN UNCONFINED AQUIFER WITH LOW-PERMEABILITY CAP

Journal of Hydrodynamics 2012年第4期24卷 605-608页

作者： HUANG Hui QIAN Jia-zhong KUANG Xing-xing CHEN Zhou LI Ru-zhong School of Resources and Environmental Engineering Hefei University of Technology Hefei 230009 China Department of Earth Sciences The University of Hong Kong Hong Kong China

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.

关键词： low-permeability cap pumping tests airflow unconfined aquifer drawdown

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Assessment of Hydraulic Parameters and Protection Zones of Catchment Aquifers for Water Supply Network in NdéDivision, West-Cameroon (Central Africa)

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Journal of Water Resource and Protection 2021年第7期13卷 478-497页

作者： Roger Feumba Kemgang Dongmo Tchouta Jean Ghislain Tabué Youmbi Valentin Yvan Emmanuel Mvondo Depesquidoux I. Tchaptchet Tchato Benjamin Ngounou Ngatcha University of Yaoundé I Yaoundé Cameroon

Ndé Division in West-Cameroon is facing with water supply although many attempts of restoring existing SCANWATER facilities by Bangangté Municipality. In order to address the issue, we assess the exploitable pumping flow rate of catchment aquifers and its hydraulic properties by using Jacob and Theis method, and define protection zones with Hoffman and Lillich method. It emerges that the hydraulic conductivity of aquifer is in the order of 10-4 m/sec, transmissivity varies from 10-4 to 10-6 m2/sec. Aquifer pumping flow rate (Q) varies between 1.5 and 10.5 m3/h. In volcanic rocks, aquifer is more productive (4.5 ≤ Q ≤ 10.5 m3/h). Transfer time of pollutants to aquifer varies from 3 to 56 days depending on rock-types and groundwater slope (0.03 - 0.13 m/m). Furthermore, 113,624 m and 1123 m are radius to be implemented for a better protection of groundwater against any form of pollutant.

关键词： pumping tests Aquifer Properties Groundwater Protection Ndé Division West-Cameroon (Central Africa)

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