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[1] Using numerical models, we evaluate hydrogeological regime changes in high-latitude river basins under conditions of ground surface warming. These models describe transient heatand fluid flow coupled to the hydrogeological impacts of phase-changes from ice to liquid water. We consider an idealized unconsolidated sedimentary aquifer system in which groundwater flow is driven by topography, r...

excessive withdrawal of groundwater and reduced rainfall in recent years have caused the drawdown of groundwater table. therefore, it is necessary to manage it for preventing its damage. the present study was carried out to investigate the effect of increasing the irrigation efficiency on groundwater fluctuation on ajab-shir plain aquifer. the aquifer was simulated by using visual modflow 3.1 s...

First posted April 5, 2021 For additional information, contact: NAWQA Chief Scientist National Water-Quality Program U.S. Geological Survey 12201 Sunrise Valley Drive, MS 413 Reston, VA 20192-0002 Groundwater provides nearly 50 percent of the Nation’s drinking water. To help protect this vital resource, (USGS) Assessment (NAWQA) Project assesses groundwater quality in aquifers that are importan...

the task of optimally assigning military ordinance to enemy targets, often termed weapon target allocation (wta) problem, has become a major focus of modern military thought where a cost effective allocation is required without degrading the required kill performance. the paper presents three main weapon allocation techniques namely uniform weapon allocation, first-in-first weapon allocation an...

In cold climates, the use of de-icing chemicals in winter can lead to groundwater contamination, especially when used large quantities, such as at airports. Oslo Airport, Gardermoen, is situated on Norway’s largest rain-fed aquifer. Potassium formate remove ice from runways and propylene glycol airplanes; organic parts are degradable. Most wells monitor spread underlying aquifer have well scree...

0022-1694/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.jhydrol.2009.07.052 * Corresponding author. Present address: ExxonMob Benmar Drive, Houston, TX 77060, United States. Tel.: 392 9294. E-mail addresses: [email protected] (P.J. Moore), jb [email protected] (E.J. Screaton). Information about sources of recharge, distributions of flow paths, and the extent of water–rock reactions in karst ...