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  • Articles  (14)
  • Groundwater  (14)
  • Springer  (14)
  • American Meteorological Society
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  • Articles  (14)
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  • Springer  (14)
  • American Meteorological Society
  • American Physical Society (APS)
  • International Union of Crystallography
  • Springer Nature
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  • 2020-2024
  • 2000-2004  (8)
  • 1995-1999  (6)
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  • Geosciences  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    Vertical variability of PCE sorption in the lacustrine clays of Mexico City (2000)
    Springer
    Environmental geology 39 (2000), S. 595-602 
    Details
    ISSN: 1432-0495
    Keywords: Key words Sorption ; Perchloroethylene (PCE) ; Mexico City ; Groundwater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A surficial clay aquitard extends through the urban area where Mexico City is located. It has been assumed to function as a protective layer to the underlying aquifer that provides 42 m3/s out of 63 m3/s of water used by 18 million inhabitants. To provide such protection, the aquitard must be impermeable to water flow and, ideally, have a significant capacity to sorb contaminants. The latter aspect was addressed, studying the vertical variability of sorption of perchloroethylene (PCE), a widely used organic compound considered to pose health risks in groundwater. Batch sorption tests were used and the clay-rich strata in the depth interval from 8 to 75 m were studied. The results suggest that sorption depends mainly on the fraction of organic carbon (foc) present in the clayey materials. The sorption data were fit to the linear and Freundlich models; many strata could be fit well by either model, while some strata were distinctly non-linear. The linear isotherms showed a mean value of 32.8 ml/g, and the Freundlich isotherm 96.6 ml/g, confirming that the clay-rich media have significant sorption capacity for PCE. From the environmental perspective the clay-rich materials are serving as protection to the groundwater system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050471
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrogen isotope indicators of seasonal source variability to groundwater (1997)
    Springer
    Environmental geology 32 (1997), S. 210-218 
    Details
    ISSN: 1432-0495
    Keywords: Key words Agriculture ; Groundwater ; Nitrate ; δ15N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A nitrogen isotope study of soil water and groundwater in southern Indiana, USA, in 1991–1992 demonstrated considerable variations in nitrate degradation processes compared to an earlier investigation in 1986–1987. Although N-fertilizers were applied in May 1991, the δ15N values in soil water decreased in February 1992, indicating its delayed release into the system after substantial rainfall. The δ15N values of groundwater decreased from +12.3‰ in November 1991 to +11.3‰ in February 1992, and to +7.5‰ in March 1992. The increased residence time of nitrate in the soil resulted in increased denitrification, ammonia volatilization and plant uptake, and reduced threat to the groundwater quality. The 1986–1987 study in the area reported that excessive rainfall during the summer rapidly transported the nitrate to deeper horizons and drastically reduced volatilization and microbial reduction of nitrate, thus increasing the immediate threat to the groundwater quality in the area. The present study demonstrated that nitrogen isotopic signatures can be used to determine the effects of local soil type, rainfall, and land-use practices on the fate of nitrate in the subsurface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050209
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  • 3
    Electronic Resource
    Electronic Resource
    Impact of polluted canal water on adjacent soil and groundwater systems (2000)
    Springer
    Environmental geology 39 (2000), S. 945-950 
    Details
    ISSN: 1432-0495
    Keywords: Water quality ; Heavy metals ; Pollution ; Groundwater ; Canal water ; Soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002549900069
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  • 4
    Electronic Resource
    Electronic Resource
    A predictive modeling approach to assessing the groundwater pollution susceptibility of the Paluxy Aquifer, Central Texas, using a Geographic Information System (2000)
    Springer
    Environmental geology 39 (2000), S. 1063-1069 
    Details
    ISSN: 1432-0495
    Keywords: Key words Pollution susceptibility ; Groundwater ; Aquifer ; Predictive modeling ; GIS ; DRASTIC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Paluxy aquifer in north-central Texas is composed primarily of Lower Cretaceous clastics. This aquifer provides water for both domestic and agricultural purposes in the region. The study area for this investigation incorporates the outcrop and recharge areas, as well as the confined and unconfined portions of the aquifer. The purpose of this investigation is to develop a predictive modeling approach for evaluating the susceptibility of groundwater in the Paluxy aquifer to contamination, and then compare this susceptibility evaluation to water-chemistry data collected from wells completed within the aquifer. Using such an approach allows one to investigate the potential for groundwater contamination on a regional, rather than site-specific scale. Based on data from variables such as land use/land cover, soil permeability, depth to water, aquifer hydraulic conductivity and topography, subjective numerical weightings have been assigned according to each variables' relative importance in groundwater pollution susceptibility. The weights for each variable comprise a Geographic Information System (GIS) map layer. These map layers are combined to formulate the final pollution susceptibility map. Using this method of investigation, the pollution susceptibility map classifies 32% of the study area as having low pollution susceptibility, 41% as having moderate pollution susceptibility, 25% as having high pollution susceptibility, and 2% as having very high pollution susceptibility. When comparing these modeling results with water-chemistry data from wells within the Paluxy aquifer, the four wells with the highest concentration of nitrate contamination are all found within regions of very high pollution potential. This confirms the accuracy and usefulness of the predictive modeling approach for assessing aquifer pollution susceptibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002549900078
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  • 5
    Electronic Resource
    Electronic Resource
    Variability of natural effluents as an indicator of groundwater retention in the Carpathian foothills (southern Poland) (2000)
    Springer
    Environmental geology 40 (2000), S. 90-98 
    Details
    ISSN: 1432-0495
    Keywords: Keywords Catchment area ; Groundwater ; Poland ; Water circulation ; Water effluents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Research into the patterns of natural underground water effluents has been conducted in a small catchment basin (Wierzbanówka) that is representative of the Carpathian foothills. The aim of this study was to understand the long-term dynamics of the effluents and their responses to natural and artificial factors in order to estimate groundwater resources. High variability of the effluent patterns in the Carpathian foothills is a result of precipitation fluctuations, low ground retention capacity, a low rate of absorption in the flysch rock formation areas, and of the Quaternary covers. In addition, the dominance of agricultural land use, low forest coverage, and poor hydrological management are the main causes of this variability. Any local increase in underground water resources would only be possible if forests were planted on some of the agricultural land and changes were made to water management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540000137
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  • 6
    Electronic Resource
    Electronic Resource
    Application of statistical methods to study seasonal variation in the mine contaminants in soil and groundwater of Goa, India (1997)
    Springer
    Environmental geology 29 (1997), S. 253-262 
    Details
    ISSN: 1432-0495
    Keywords: Key words Discriminant analysis ; Partial correlation ; Soil ; Groundwater ; Seasonal variation ; Mine contaminants ; India
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Soil and groundwater samples were collected during two seasons, premonsoon (April 1990) and postmonsoon (December 1990), and analyzed for major elements (Na, Mg, Al, Si, P, K, Ca, Ti, Mn and Fe), trace elements (Ni, Pb, Co, Cr and Zn) and water parameters (pH, conductivity, acidity, alkalinity, hardness, Cl and SO4). All the data were subjected to linear discriminant analysis and partial correlation analysis in order to understand the seasonal variation in the data. It was observed from the Mahalanobis generalized distance that in both soil and groundwater samples there was a large difference in the concentration level of premonsoon and postmonsoon data. Linear discriminant functions were calculated to distinguish between premonsoon and postmonsoon samples. From the partial correlation coefficient analysis of soil samples, dominance of chemical weathering and precipitation of atmospheric fallout during monsoon were inferred. In the case of the water samples, high conductivity and high hardness in the postmonsoon samples as well as atmospheric fallout of Pb and Ni during the premonsoon period was suggested from partial correlation of water samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050124
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  • 7
    Electronic Resource
    Electronic Resource
    The relationship between the water table and the surface flow of a losing stream, lower Medano Creek, Great Sand Dunes National Monument, Colorado (1997)
    Springer
    Environmental geology 30 (1997), S. 10-16 
    Details
    ISSN: 1432-0495
    Keywords: Key words Hydrogeology ; Surface water ; Groundwater ; Streamflow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Proposed groundwater withdrawals in the San Luis Valley of Colorado may lower the water table in Great Sand Dunes National Monument. In response, the National Park Service initiated a study that has produced a generalized conceptual model of the hydrologic system in order to assess whether a lowering of the water table might decrease the surface flow of lower Medano Creek. Based upon information obtained during the drilling of several boreholes, there appear to be five important hydrostratigraphic units underlying lower Medano Creek within the upper 30 m of the ground surface: 1. a perched aquifer overlying an aquitard located between about 5 and 6 m below the ground surface; 2. the aquitard itself; 3. an unconfined aquifer located between the upper and lower aquitards; 4. an aquitard located between about 27 and 29 m below the ground surface; and 5. a confined underlying the lower aquitard. Because the areal extent of the aquitards cannot be determined from the borehole data, a detailed conceptual model of the hydrogeologic system underlying lower Medano Creek cannot be developed. However, a generalized conceptual model can be envisioned that consists of a complex system of interlayered aquifers and leaky aquitards, with each aquifer having a unique hydraulic head. Water levels in the perched aquifer rise rapidly to their annual maximum levels in response to the arrival of the flow terminus of Medano Creek during the spring runoff event, and the location of the flow terminus is directly dependent upon the discharge of the creek. Water levels in the deeper, non-perched aquifers do not appear to fluctuate significantly in response to the arrival of the flow terminus, demonstrating that it is unlikely that the proposed groundwater withdrawals will decrease the surface flow of lower Medano Creek.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050127
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  • 8
    Electronic Resource
    Electronic Resource
    The influence of marine inflows on the chemical composition of groundwater in small islands: the example of the Cyclades (Greece) (1997)
    Springer
    Environmental geology 31 (1997), S. 133-141 
    Details
    ISSN: 1432-0495
    Keywords: Key words Cyclades archipelago ; Contamination ; Groundwater ; Marine inflow ; Salinization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Marine contamination of groundwater may be caused by seawater intrusion and by salt spray. The role of both processes was studied in the Cyclades archipelago on four small islands (45–195 km2) whose aquifers consist essentially of fractured, weathered metamorphic rocks. Annual rainfall ranges from 400 to 650 mm and precipitation has high total dissolved solids contents of 45–223 mg l–1. The chemical characteristics of the groundwater, whose salinity is from 0.4 to 22 g l–1, are strongly influenced by seawater intrusion. However, the effect of atmospheric input is shown in certain water sampling locations on high ground elevation where the dissolved chloride contents may attain 200 mg l–1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050172
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  • 9
    Electronic Resource
    Electronic Resource
    Hydrogeology and sustainable agriculture (1997)
    Springer
    Environmental geology 32 (1997), S. 93-99 
    Details
    ISSN: 1432-0495
    Keywords: Key words Hydrogeology ; Agriculture ; Sustainable development ; Groundwater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The world's population continues to grow and to require more and more food. Attempts by modern high output agriculture to meet this need have led to serious environmental problems. A more sustainable balance is now required and is being sought in a variety of ways. Hydrogeologists should continue to highlight the threat posed by agriculture to groundwater, particularly since groundwater is a hidden resource and its degradation and rehabilitation often take place slowly. But the time has come for groundwater specialists to go further and become actively involved in helping to provide practical and sustainable solutions. The agriculture of the future requires a holistic approach which balances the essential economics of food production with equally valid environmental needs, including those of groundwater. Such an approach demands cross-sectoral collaboration involving multidisciplinary research and action within an integrated policy framework. This paper reviews the current groundwater/agriculture interface and some of the attempts being made to achieve a more truly sustainable agriculture with particular emphasis on European experience. It aims to stimulate greater interest and involvement by hydrogeologists in helping to bring about realistic solutions that will enable future generations to enjoy adequate good quality food and water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050197
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  • 10
    Electronic Resource
    Electronic Resource
    A concept of forming a structure of ecological indicators and indexes for regions sustainable development (2000)
    Springer
    Environmental geology 39 (2000), S. 1227-1236 
    Details
    ISSN: 1432-0495
    Keywords: Key words Sustainable development ; Indicators ; Indexes ; Groundwater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A complex method for assessing the ecological state of groundwater by using indicators and indexes of underground hydrosphere sustainable development, and of characterizing its quality, is given for an oil field. The concept of forming indicators and indexes of sustainable development has been elaborated for this purpose. When forming a structure of environment indicators, the developments of the European Organization for Economic Co-operation and Development (OECD) in this sphere were considered. New indicators are given and a structure of indexes quantitatively characterizing them is worked out. Indexes can be simple, complex, muldidisciplinary and inter-multidisciplinary by their structure. By their essence indexes are subdivided into five classes: indexes of quality, damage, interaction, hydrogeochemical and dynamic ones. The ecological state of groundwater is assessed by the following categories of sustainability: sustainable, slightly unsustainable, medium unsustainable, unsustainable, highly unsustainable, catastrophically unsustainable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002549900092
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