نتایج جستجو برای: groundwater artificial discharge

تعداد نتایج: 412190  

2003
A. Butturini S. Bernal E. Nin L. Rivero F. Sabater

[1] Stream aquifer hydrology and nitrate removal were studied, over a period of 2 years, in an unsaturated riparian zone, bounded by an intermittent Mediterranean stream, (Fuirosos, northeastern Spain). The riparian groundwater system is characterized by drastic hydrological changes and by mixing of stream water with hillslope groundwater. The hillslope groundwater flowed through a medium with ...

2017
Troy E. Gilmore David P. Genereux D. Kip Solomon John E. Solder

We measured groundwater apparent age (s) and seepage rate (v) in a sandy streambed using point-scale sampling and seepage blankets (a novel seepage meter). We found very similar MTT estimates from streambed point sampling in a 58 m reach (29 years) and a 2.5 km reach (31 years). The TTD for groundwater discharging to the stream was best fit by a gamma distribution model and was very similar for...

2000
T. E. Ackman G. A. Veloski R. A. Dotson

A survey to locate all potential pollution sources in a watershed can be overwhelming in terms of the commitment of capital, equipment, and manpower. For this reason, alternative methods were sought that could lessen the time and cost of these initial watershed surveys. In this paper, airborne thermal infrared (TIR) imaging and geophysical techniques, such as electromagnetic conductivity and ve...

2013
Shishir Gaur Sudheer Ch Didier Graillot B. R. Chahar Nagesh Kumar

Ground management problems are typically solved by the simulation-optimization approach where complex numerical models are used to simulate the groundwater flow and/or contamination transport. These numerical models take a lot of time to solve the management problems and hence become computationally expensive. In this study, Artificial Neural Network (ANN) and Particle Swarm Optimization (PSO) ...

2008
Kathleen M. Bailey Barbara L. Bedford

Hydrochemical patterns across groundwater-fed wetlands, especially carbonate and redox gradients, can influence phosphorus (P) availability by controlling its distribution among different soil pools. We explored these linkages by comparing shallow (5–20 cm) soil properties along groundwater flowpaths in two rich fens, a marl fen, and a poor fen. Organic matter content, bulk density, and total e...

2014
Yadu N Pokhrel Ying Fan Gonzalo Miguez-Macho

This study contributes to the discussions on the future of the Amazon rainforest under a projected warmer-drier climate from the perspectives of land hydrology. Using IPCC HadGEM2-ES simulations of the present and future Amazon climate to drive a land hydrology model that accounts for groundwater constraint on land drainage, we assess potential hydrologic changes in soil water, evapotranspirati...

2006
Alexandria B. Boehm Adina Paytan Gregory G. Shellenbarger Kristen A. Davis

The coastal, unconfined aquifer at Huntington Beach, California contains saline groundwater (33 psu) adjacent to the water line, and a brackish groundwater (BGW) mixing zone (3–9 psu) approximately 50m from the water line. According to salinity and water isotope analyses, the BGW composition varies spatially in the alongshore direction. Measurements obtained from two BGW wells indicate this wat...

Journal: :Applied and environmental microbiology 1986
J J Pignatello

1,2-Dibromoethane (EDB), which is a groundwater contaminant in areas where it was once used as a soil fumigant, was shown to be degraded aerobically by microorganisms in two types of surface soils from an EDB-contaminated groundwater discharge area. At initial concentrations of 6 to 8 mug/liter, EDB was degraded in a few days to near or below the detection limit of 0.02 mug/liter. At 15 to 18 m...

2011
A. P. Aizebeokhai

Climate change observed over the past decades has been consistently associated with modifications of components of the hydrological systems such as precipitation patterns, sea surface temperature, accelerated melting of glacier and ice caps, soil temperature and moisture, surface runoff and stream flow. Such changes are known to influence subsurface hydrological systems, which could lead to cha...

Journal: :Entropy 2014
Wei Xu Shanghai Du

The groundwater flow system is typical dissipative structure system, and its evolution can be described with system information entropies. The information entropies of groundwater in Shijiazhuang City had been calculated between 1960 and 2005, and the results show that the entropies have a decreasing trend throughout the research period, and they can be divided into our stages based on the grou...

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