نتایج جستجو برای: groundwater basin

تعداد نتایج: 82764  

2007
B. K. Kortatsi

Analysis of trace metals in groundwater from the Ankobra basin revealed high levels of iron, manganese and aluminium. Approximately 40% of boreholes had total iron concentration exceeding 1000 μg l-1 (maximum WHO permissible limit). Aluminium concentration varied from 0.1 μg l-1 to 2510 μg l-1 with a median value of 10.0 μg l-1. Approximately 20% of the boreholes had aluminium concentration exc...

Journal: :Ground water 2014
M J M Cheema W W Immerzeel W G M Bastiaanssen

Groundwater abstraction and depletion were assessed at a 1-km resolution in the irrigated areas of the Indus Basin using remotely sensed evapotranspiration (ET) and precipitation; a process-based hydrological model and spatial information on canal water supplies. A calibrated Soil and Water Assessment Tool (SWAT) model was used to derive total annual irrigation applied in the irrigated areas of...

2007
Assefa M. Melesse Vijay Nangia Xixi Wang Michael McClain

Vegetation cover and groundwater level changes over the period of restorationare the two most important indicators of the level of success in wetland ecohydrologicalrestoration. As a result of the regular presence of water and dense vegetation, the highestevapotranspiration (latent heat) rates usually occur within wetlands. Vegetation cover andevapotranspiration of large areas of restoration li...

2009
Tian-Chyi J. Yeh Jianwei Xiang Raghavendra M. Suribhatla Kuo-Chin Hsu Cheng-Haw Lee Jet-Chau Wen

[1] Data from tomographic surveys make an inverse problem better posed in comparison to the data from a single excitation source. A tomographic survey provides different coverages and perspectives of subsurface heterogeneity: nonfully redundant information of the subsurface. Fusion of these pieces of information expands and enhances the capability of a conventional survey, provides cross valida...

Journal: Journal of Tethys 2017

The Gafsa mining basin district in Southwestern Tunisia is one of the most important producers of phosphate in the world. The exploitation of this district started at the beginning of the twentieth century a few years after the first discovery of this valuable resource. The over-exploitation of groundwater to wash the phosphate caused water-level decline in the main aquifers and the corollaries...

Behnaz RaheliNamin, Behrooz Mohseni,

Background & Aims of the Study: Groundwater resources are a crucial component of the ecosystem. Management and cleanup of contamination from groundwater resources requires a long term strategy and a huge amount of investments. Artificial neural networks (ANN) and Geographic Information System (GIS) can be useful in determining management strategies. To protect these valuable resourc...

Journal: :Environmental monitoring and assessment 2010
Mohan Viswanathan Prasanna S Chidambaram A Shahul Hameed K Srinivasamoorthy

Gadilam river basin has gained its importance due to the presence of Neyveli Lignite open cast mines and other industrial complexes. It is also due to extensive depressurization of Cuddalore aquifer, and bore wells for New Veeranam Scheme are constructed downstream of the basin. Geochemical indicators of groundwater were used to identify the chemical processes that control hydrogeochemistry. Ch...

1999
W. T. Sloan

In the majority of lumped water balance models of river basins, groundwater is represented by a single reservoir, and groundwater discharge is described by a singlevalued function of storage in the reservoir. It is demonstrated that single-valued storagedischarge functions are often incapable of representing the actual storage-discharge characteristics of a river basin. An alternative discharge...

2014
Aivars Spalvins

In 2010–2012, scientists of Riga technical University have developed the hydrogeological model of Latvia (LAMO). In 2013, LAMO has been applied as a tool to implement in Latvia aims laid down by the European Union Water Framework Directive for sustainable use of water resources. The set of hydrogeological maps was prepared for updating of the water management plans for the river basin districts...

2017
T. O. Abdullah S. S. Ali N. A. Al-Ansari S. Knutsson

Halabja Saidsadiq Basin (HSB) is one of a major basin of Iraq in terms of groundwater reservoirs. Intensive agricultural practices and economic revolution are widespread and located close to groundwater wells, which pose imminent threats to these resources. Therefore, the most effective and realistic solution is to prevent the contamination of groundwater through. The present study targets the ...

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