نتایج جستجو برای: ground water depth
تعداد نتایج: 817226 فیلتر نتایج به سال:
A U.S. Geological Survey (USGS) study of the transport of anthropogenic and natural contaminants to public-supply wells (PSWs) in four aquifer systems documents the occurrence and distribution of arsenic and uranium, and determines some of the mechanisms for their mobilization and movement. The study areas include a glacial aquifer system in Woodbury, Connecticut (referred to herein as CT); the...
In the context of agricultural nitrogen excesses in northwestern France, pyrite-bearing weathered schist aquifers represent important hydrological compartments due to their capacity to eliminate nitrate (NO3-). Under oxygen-free conditions, nitrate is reduced simultaneously with the oxidation of pyrite leading to the release of sulfate (SO4/2-). The aim of the present study is to identify the h...
Significant numbers of bird species forage on the tubers of the submerged aquatic species. This resource is difficult to map due to the submerged nature of these species. Because the temperature is the primary driving factor of photosynthesis in these vegetation species, it is possible to map the distribution and biomass production of these submerged species indirectly. For the relative short g...
The hydrogeological system of an ecologically sensitive alpine floodplain in the Valle di Blenio, Switzerland, was investigated using hydrochemical and 3H-3He dating methods. Water samples from six wells and from different surface locations were analyzed. The analysis of the concentrations of major ions in conjunction with age determination by the 3H-3He-method allowed the main hydrological pro...
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