Results 1 - 10 of 33158
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[en] An estimation of the groundwater recharge was made, for the first time, in laterita, which is a alteration of dunite. This work was carried out at the city of Cajati-Jacupiranga, situated in the Ribeira Valley, state of Sao Paulo. The moisture migration in unsaturated zones was analized using water tagget with artificial tritium. In the place studied, an annual recharge of 1070mm was estimated. This value corresponds to 65% of local precipitation (1650 mm/year). The difference can be considered as a loss through evaporation, evapotranspiration and run off. (author)
[pt]A estimativa da recarga de aquiferos foi feita pela primeira vez em laterita, que e uma alteracao do dunito, na cidade de Cajati-Jacupiranga, situada no Vale do Ribeira, no estado de Sao Paulo, que se caracteriza por ter um clima tropical umido. Analisou-se a migracao da umidade na zona nao saturada utilizando-se como tracador o tritio artificial, na forma de agua tritiada. Obteve-se para o local de estudo uma recarga anual de 1070mm, o que corresponde a 65% da precipitacao local, 1650 mm/ano. Pode-se considerar que o restante da precipitacao e perdido por evaporacao, evapotranspiracao e escoamento superficial. (autor)
[en] The purpose of the conference was to provide a forum to exchange views and ideas, to focus attention on groundwater problems and to examine techniques and strategies for their investigation and effective management or control. In addressing the theme of the conference - Groundwater Systems Under Stress, three principal topics were: identification of groundwater systems under stress; evaluation of groundwater systems; and solution or control of problems
[en] This study was carried out to find out the distribution of radon (222Rn) activity concentration measured in the groundwater samples from the East coast of West Bengal, India. The 222Rn activity in 20 groundwater samples were measured using Durridge RAD-7and the values of 222Rn were found between 1.9 ± 0.78 and 9.0 ± 1.13 Bq L-1 with average of 5.0 ± 0.83 Bq L-1. These are well within the EPA's maximum contaminant level of 11.1 Bq L-1. (author)
[en] The TOUGH (Transport Of Unsaturated Groundwater and Heat) family of codes has great flexibility in handling the variety of grid information required to describe a complex subsurface system. However, designing and generating such a grid can be a tedious and error-prone process. This is especially true when the number of cells and connections is very large. As a user-friendly, efficient, and effective grid generating software, WinGridder has been developed for designing, generating, and visualizing (at various spatial scales) numerical grids used in reservoir simulations and groundwater modeling studies. It can save mesh files for TOUGH family codes. It can also output additional grid information for various purposes in either graphic format or plain text format. It has user-friendly graphical user interfaces, along with an easy-to-use interactive design and plot tools. Many important features, such as inclined faults and offset, layering structure, local refinements, and embedded engineering structures, can be represented in the grid
[en] The type of groundwater yielded from existing deep wells situated within 2Km from coastal line in U-do and Songsan area in classified as category 7, that is primarily salinity dominated by alkalies and strong acid such as saline water. The chlorine contents of the groundwater ranges from about 200ppm to 600 ppm. Tritium, deuterium, and oxygen-18 contents of seawater are 5.74±0.49TU, -4.6±1.2 o/oo, -0.8±0.02 o/oo in maximum, and 8.67±0.45TU, -24±0.18 o/oo, -3.61±0.12 o/oo in case of rainwater, and 15.11±0.61TU, -43.4±1.12 o/oo, -7.2±0.5 o/ oo in case of pure and not affected groundwater by salt water encroachment. In general the groundwater bodies being highly affected by salt water intrusion are characterized by that content of tritium is similar or quite same with one of the pure-nonaffected groundwater and contents of stable isotopes are higher than those. (Author)
[en] The Ursuya Mount is one of the main water supplies of the Northern Basque Country. A study is being conducted since 2009 on this aquifer in order to improve the knowledge on its potential and its hydrodynamics properties. Two hydrological cycles are required to get the necessary data to meet the following objectives: clarifying the aquifer potential of the site both quantitatively and qualitatively; determining the geographic and seasonal variations; understanding the origin and the flow pattern of the groundwater; evaluating the groundwater residence times and the areas of preferential recharge. Here, we present only some geochemical and isotopic data. Thus, structural or hydrodynamic approaches will not be discussed.
[en] Starting from a fresh ground granite sample several fractions were obtained that correspond to the following size ranges: 250 mu m>x>125 mu m, 125 mu m>x>63mu m, 63 mu m>x>40 mu m, and x <40 mu m. In the first three fractions the light and heavy constituents were also separated using liquids of different densities. The lighter components were mainly Quartz (Q), Potassium Feldspar (KFd, Microcline) and Plagioclases (Plag., Albite); the heavier were Biotite, Muscovite and Chlorite (and other possible accessory minerals such as Andalusite and Apatite). At the same time that light constituents were separated in the three following fractions: a) Q+KFd+Plag b) Q+Plag c) KFd. (Author)
[en] With reference to the article published in the last issue of Science Uruguay, the authors of this paper make a concise and orderly description about aquifers in Uruguay, this article provides qualified information about different types of aquifers and their distribution in Uruguay.