J.A. Corcho Alvarado

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Zheng‐Tian Lu

University of Science and Technology of China

Rolf Kipfer

Swiss Federal Institute of Aquatic Science and Technology

Hugo A. Loáiciga

University of California, Santa Barbara

Neil C. Sturchio

University of Delaware

Roland Purtschert

University of Bern

Hervé Jegat

University of the Andes

Cooperative Institutions

Weatherford College

Argonne National Laboratory

Swiss Federal Institute of Aquatic Science and Technology

ETH Zurich

University of Bern

University of Science and Technology of China

Hefei National Center for Physical Sciences at Nanoscale

Beijing Academy of Quantum Information Sciences

Chinese Academy of Sciences

Goethe University Frankfurt

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Groundwater dating and past climate reconstruction

Roland Purtschert J.A. Corcho Alvarado Rolf Kipfer Zheng‐Tian Lu Neil C. Sturchio

In the past decade aquifers have increasingly become palaeoclimatic archives in their own right alongside ice cores, sediments and other proxy records. The main tool for this task has been the noble gas palaeo-thermometer in combination with quantitative groundwater dating using radionuclides. Noblegas radionuclides play a unique role as tracers in environmental studies due to their chemical inertness and low concentration making them ideal tracers. The same properties on the other hand make them difficult to measure on natural concentration levels. Therefore for decades low level counting (LLC) was the only method for detecting radioisotopes of argon and krypton at an atmospheric level. In recent times and with the increase of interest and potential applications the analytical efforts with novel detection methods have been intensified. In the talk noble gas groundwater dating techniques over times scales from decades to millions of years are discussed in relation to noble gas palaeo records at different locations in Europe and elsewhere.

Noble gas

Ice core

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Hydrogeological, isotopic and hydrochemical study of the Valencia Lake basin, Venezuela

J.A. Corcho Alvarado

Valencia

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Overexploitation and Deterioration of Aquifers in Venezuela

Groundwater Monitoring & Remediation (1995)

Hervé Jegat J.A. Corcho Alvarado Hugo A. Loáiciga

Abstract Approximately 50 percent of the potable, industrial, and agricultural water supply in Venezuela comes from ground water, mined through some 40,000 wells scattered around the country. The majority of the productive aquifers consist of quaternary deposits in mountain valleys and coastal lowlands, all of which are situated in areas with limited or low precipitation. Intensive exploitation of several of these aquifers for the last 30 years has resulted in overdraft conditions and ground water contamination, causing serious socio‐economic consequences in various regions of Venezuela. This paper reviews the quality and quantity aspects of overdrafted aquifers in Venezuela, which can he classified into three major categories: (1) aquifers in the coastal lowlands in the stales of Falcon and Zulia of northern Venezuela: (2) the intermontane Carora and Quibor Valley Aquifers: and (3) aquifers in the Lake Valencia Watershed. If current trends of aquifer overexploitation continue, further water deficits and irreversible environmental damage are predicted.

Overexploitation

Overdraft

10.1111/j.1745-6592.1995.tb00544.x

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