Latest Research News on Aquifer: April 2020

Aquifer overexploitation: what does it mean?
Groundwater overexploitation and aquifer overexploitation are terms that are becoming common in water-resources management. Hydrologists, managers and journalists use them when talking about stressed aquifers or some groundwater conflict. Overexploitation may be defined as the situation in which, for some years, average aquifer abstraction rate is greater than, or close to the average recharge rate. [1]

Response of well‐aquifer systems to Earth tides
The water level in a well open to an artesian aquifer responds to pressure‐head fluctuations caused by the dilatation of the aquifer. Based on hydrologic considerations, it is shown that (1) most well‐aquifer systems respond to disturbances with periods of less than several days as if the well were drilled into a medium of infinite or partially bounded extent, and (2) the representation of an aquifer as a finite cavity is unrealistic for most well‐aquifer systems.[2]

Scale‐dependent dispersion in a stratified granular aquifer

The magnitude of longitudinal dispersivity in a sandy stratified aquifer was investigated using laboratory column and field tracer tests. The field investigations included two‐single‐well injection‐withdrawal tracer tests using 131I and a two‐well recirculating withdrawal‐injection tracer test using 51Cr‐EDTA. The tracer movement within the aquifer was monitored in great detail with multilevel point‐sampling instrumentation. A constant value for dispersivity of 0.7 cm was found to be representative (and independent of travel distance) at the scale of an individual level within the aquifer. [3]

Groundwater Flow Modeling in a Nubian Sandstone Aquifer, South Western Desert, Egypt

This paper presents a methodology for management and evaluation of groundwater aquifer in the Middle Part of Darb El-Arbaein Area. Three dimensional lithologic modeling techniques have been used for detailed characterization and groundwater flow modeling of the aquifer system in the middle part of Darb El-Arbaein area. Well log data was used for setting the lithologic model using Rock Works software V. 15. A groundwater flow model, facilitated by MODFLOW 2011, was built using results of the lithologic model. [4]

Aquifer Characteristics and Groundwater Quality Assessment in Ikwuano Area of Southeastern Nigeria

The present work is a review on the geoelectrical characteristics, and a study of physico-chemical parameters of groundwater in parts of Ikwuano Local Government Area of Abia State, Nigeria. The aim was to collate, synthesize and analyse geoelectrical parameters from available literature together with physico-chemical parameters in order to evaluate the geophysical and geochemical character of the aquifer systems; and subsequently determine the quality of groundwater in the area. The study shows that aquifer thickness varies from 24.5m to about 201.1m, the Formation Factor ranges from 2.02 to 13.53, and the groundwater is naturally potable. [5]

Reference

[1] Custodio, E., 2002. Aquifer overexploitation: what does it mean?. Hydrogeology journal, 10(2), pp.254-277.

[2] Bredehoeft, J.D., 1967. Response of well‐aquifer systems to earth tides. Journal of Geophysical Research, 72(12), pp.3075-3087.

[3] Pickens, J.F. and Grisak, G.E., 1981. Scale‐dependent dispersion in a stratified granular aquifer. Water Resources Research, 17(4), pp.1191-1211.

[4] Pickens, J.F. and Grisak, G.E., 1981. Scale‐dependent dispersion in a stratified granular aquifer. Water Resources Research, 17(4), pp.1191-1211.
[5] Amos-Uhegbu, C., Igboekwe, M.U., Chukwu, G.U., Okengwu, K.O. and Eke, K.T., 2014. Aquifer characteristics and Groundwater Quality Assessment in Ikwuano Area of Southeastern Nigeria. Journal of Scientific Research and Reports, pp.366-383.

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