scholarly journals Drainage of Bank Storage in Shallow Unconfined Aquifers

10.5772/35904 ◽  
2012 ◽  
Author(s):  
Djehiche Abdelkader ◽  
Gafsi Mustapha ◽  
Kotchev Konstanti
Keyword(s):  
Unconfined Aquifers

CHARACTERIZING UNCONFINED AQUIFERS USING SEEP- AND STREAM-BASED MEASUREMENTS OF GROUNDWATER AGE

2016 ◽  
Author(s):  
D. Kip Solomon ◽  
◽  
Troy E. Gilmore ◽  
David P. Genereux ◽  
Jennifer Georgek ◽  
...  
Keyword(s):  
Groundwater Age ◽  
Unconfined Aquifers

Fluoride Hazard and Risk Enumeration of Hard Rock Unconfined Aquifers in the Extended Part of Chhota Nagpur Gneissic Complex

2021 ◽  
Vol 97 (2) ◽  
pp. 199-209
Author(s):  
Biswajit Bera ◽  
Sumana Bhattacharjee ◽  
Meelan Chamling ◽  
Arijit Ghosh ◽  
Nairita Sengupta
Keyword(s):  
Hard Rock ◽  
Unconfined Aquifers ◽  
Hazard And Risk

Closure to “Inflow Hydrographs from Large Unconfined Aquifers”

1966 ◽  
Vol 92 (3) ◽  
pp. 68-69
Author(s):  
Hassan Ali Ibrahim ◽  
Wilfried Brutsaert
Keyword(s):  
Unconfined Aquifers

scholarly journals Vulnerability assessment and potential contamination of unconfined aquifers

2018 ◽  
Vol 19 (4) ◽  
pp. 1008-1016 ◽  
Author(s):  
J. Caprario ◽  
A. S. Rech ◽  
A. R. Finotti
Keyword(s):  
Vadose Zone ◽  
Vulnerability Index ◽  
The Other ◽  
Sensitivity Analyses ◽  
Drastic Model ◽  
Groundwater Availability ◽  
Unconfined Aquifers ◽  
Direct Infiltration ◽  
The Subject ◽  
The Impact

Abstract The decline in groundwater availability and quality has become a worldwide issue and has been the subject of several studies in recent decades. In this sense, the goal of this study is to assess the vulnerability of the Campeche Aquifer (Florianopolis, Brazil), identifying potential areas of possible contamination by the direct infiltration of runoff in drainage compensatory techniques. To achieve this goal, the following methodological steps were used: (1) data collection and preparation, (2) application of the DRASTIC model, (3) sensitivity analysis and (4) analysis of potential contamination by compensatory techniques. The results show that approximately 33% of the aquifer area presented moderate vulnerability to contamination. However, 29% of the remaining areas had high and extremely high vulnerability. Analysing the potential of contamination with drainage compensatory structures we verified that approximately 95% of them are located in areas of vulnerability classified as moderate and high. The other 5% were identified in areas with extremely high vulnerability. Sensitivity analyses indicated that the removal of topography, soil type and the impact of the vadose zone caused a large variation in vulnerability index. It is evident that there is a high potential of contamination of groundwater by direct infiltration of drainage compensatory structures.

Nitrate in aquifers beneath agricultural systems

2002 ◽  
Vol 45 (9) ◽  
pp. 19-29 ◽  
Author(s):  
M.R. Burkart ◽  
J.D. Stoner
Keyword(s):  
United States ◽  
Groundwater Vulnerability ◽  
The United States ◽  
Point Sources ◽  
Nitrate Contamination ◽  
Agricultural System ◽  
Agricultural Systems ◽  
Fertilizer Use ◽  
Unconfined Aquifers ◽  
The World

Research from several regions of the world provides spatially anecdotal evidence to hypothesize which hydrologic and agricultural factors contribute to groundwater vulnerability to nitrate contamination. Analysis of nationally consistent measurements from the U.S. Geological Survey’s NAWQA program confirms these hypotheses for a substantial range of agricultural systems. Shallow unconfined aquifers are most susceptible to nitrate contamination associated with agricultural systems. Alluvial and other unconsolidated aquifers are the most vulnerable and shallow carbonate aquifers provide a substantial but smaller contamination risk. Where any of these aquifers are overlain by permeable soils the risk of contamination is larger. Irrigated systems can compound this vulnerability by increasing leaching facilitated by additional recharge and additional nutrient applications. The agricultural system of corn, soybeans, and hogs produced significantly larger concentrations of groundwater nitrate than all other agricultural systems, although mean nitrate concentrations in counties with dairy, poultry, cattle and grains, and horticulture systems were similar. If trends in the relation between increased fertilizer use and groundwater nitrate in the United States are repeated in other regions of the world, Asia may experience increasing problems because of recent increases in fertilizer use. Groundwater monitoring in Western and Eastern Europe as well as Russia over the next decade may provide data to determine if the trend in increased nitrate contamination can be reversed. If the concentrated livestock trend in the United States is global, it may be accompanied by increasing nitrogen contamination in groundwater. Concentrated livestock provide both point sources in the confinement area and intense non-point sources as fields close to facilities are used for manure disposal. Regions where irrigated cropland is expanding, such as in Asia, may experience the greatest impact of this practice.

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