Riparian zones in semi-arid regions often exhibit high rates of evapotranspiration (ET) in spite of low soil moisture content due to vegetation that is able to withdraw water from shallow aquifers. This work better defines the relationship between ET and the saturated zone by comparing the observed water table drawdown to analytically modeled drawdown in fully penetrating wells of an unconfined...

The hydrology and geochemistry of groundwater in tropical island aquifers, such as Barbados, Guam and Puerto Rico, are significantly influenced by tropical climatic conditions. Recharge to these aquifers is the product of regional and local climate patterns that control rainfall. Oxygen isotopes can be used to estimate the amount and timing of recharge on these islands because seasonal fluctuat...

ABSTRACT The French Mediterranean coastal aquifers are essentially alluvial, deep sedimentary and karst. Whereas the alluvial aquifers are particularly sensitive to salt-water intru sion, contamination of the deep aquifers is generally due to vertical hydraulic connec tion with the shallow aquifers. As for the karst systems, which are quite well developed f rom Languedoc-Roussillon to Provence-...

0022-1694/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.jhydrol.2009.12.010 * Corresponding author. Present address: Montana tana, Department of Geological Engineering, Butte, MT fax: + 1 406 496 4260. E-mail address: [email protected] (B. Malama) We investigate the response of the saturated zone (unconfined aquifer) to evapotranspiration (ET) flux at ground surface. We neglect fluid fl...

introduction of ostrich (struthio camelus domesticus), a new exotic host species to a new ecosystem likeiran, necessitates the study of its infectious diseases including parasitic infestations. for a period of one year, from 2002–03, faecal samples of 254 ostriches on 5 farms located at different parts of iran, includinggarmsar, semnan province (n = 85); nashtaroud, mazandaran province (n = 29)...

Abstract Although chalk aquifers are not too often associated with conduit flow, they highly productive groundwater systems and, like limestone aquifers, can be vulnerable to contamination when exposed land use activities. The Danish carbonate rocks generally recognized fractured and covered by thick Quaternary sediments. Fissure flow is pronounced, occurring in the upper 50–100 m due Pleistoce...

Abstract Mountain block recharge (MBR) mechanisms are an important component of the water budget for many alluvial aquifers worldwide. The MBR dynamics complex, difficult to constrain, and quantification is highly uncertain. These challenges magnified in data-scarce study areas, including Cul-de-Sac Leogane plains, two Haiti’s largest aquifers, which flanked by Massif de la Selle mountain block...

Dissolved noble gases in groundwater are used to reconstruct paleotemperature, but also yield information about "excess air", a component of dissolved gases in excess of solubility equilibrium, derived from dissolution of trapped air in the ground. A good characterization of the excess air component is necessary not only to obtain reliable noble gas temperatures, but also to investigate the pot...

[1] The 26 December 2004 tsunami caused widespread destruction and contamination of coastal aquifers across southern Asia. Seawater filled domestic open dug wells and also entered the aquifers via direct infiltration during the first flooding waves and later as ponded seawater infiltrated through the permeable sands that are typical of coastal aquifers. In Sri Lanka alone, it is estimated that ...

Horizontal wells or radial collector wells are used in shallow aquifers to enhance water withdrawal rates. Groundwater flow patterns near these wells are three-dimensional (3D), but difficult to represent in a 3D numerical model because of the high degree of grid refinement needed. However, for the purpose of designing water withdrawal systems, it is sufficient to obtain the correct production ...