نتایج جستجو برای: shallow groundwater

تعداد نتایج: 62766  

2006
Milada STASTNA Thomas Zenker

Th e aims of the study were to apply, test and to present the ability of the deterministic simulation models SIMWASER and CERES-Wheat computing soil-water balance components, percolation losses, ground water recharge and capillary rise. Two case studies for the assessment of percolation losses from irrigated carrots to deep groundwater at Obersiebenbrunn in the Marchfeld (Austria) and ground wa...

2009
MARIA BRUMM CHI-YUEN WANG

Heat flow in the Sierra Nevada, CA, is low despite its young geologic age. We investigate the possibility that advective heat transport by groundwater flow leads to an underestimate of heat flow in the Sierras based purely on borehole measurements. Using temperature and discharge measurements at springs in Sagehen Basin, we find that groundwater removes the equivalent of approximately 20–40 mW ...

2007
D. Holliday T. C. Stieglitz P. V. Ridd W. W. Read

[1] Submarine groundwater discharge (SGD) into the ocean is increasingly recognized as an important component of land-ocean interaction. Numerous geological settings may be the source of terrestrially derived SGD, including spatially extensive sand dune systems, which are a common coastal setting in tropical, subtropical, and temperate regions throughout the world. Within the catchment of the G...

2007
Renji Remesan R. K. Panda

© 2007 Wiley Periodicals, Inc. Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/tqem.20130 Groundwater is an essential source of drinking water in rural India. Contamination of groundwater (resulting from human activities or from inherent aquifer material composition) reduces the supply of safe drinking water, posing a threat to public health and a challenge to ...

2009
L. D. Rajasooriyar K. M. Hiscock

The estimated health impact of naturally occurring fluoride is considered to be more widespread than arsenic (WHO, 2004). From the known global distribution of endemic fluorosis, the most affected regions are in arid to semi-arid climatic zones. Fluoride (F) in its most common form is found in several geological environments including igneous, sedimentary and metamorphic rocks and leaching of F...

Journal: :Environmental science & technology 2016
Steven J Hall Samantha R Weintraub David Eiriksson Paul D Brooks Michelle A Baker Gabriel J Bowen David R Bowling

Snowmelt dominates the hydrograph of many temperate montane streams, yet little work has characterized how streamwater sources and nitrogen (N) dynamics vary across wildland to urban land use gradients in these watersheds. Across a third-order catchment in Salt Lake City, Utah, we asked where and when groundwater vs shallow surface water inputs controlled stream discharge and N dynamics. Stream...

2012
Qian Huang Shizhang Peng Zhendong Du Ningjiang Lu

Due to excessive exploitation of groundwater resources to meet crop irrigation requirement, shallow groundwater table is falling at the rate of about 1m/y for the last 20 years in North China plain, which has caused many ecological and environmental problems. A kind of non-linear multi-year optimization model of groundwater resources allocation (MOGA) has been developed to decrease groundwater ...

Background and Purpose: This study was undertaken, first, to investigate the hydrogeological setting of the study area and geophysical data, second to examine the general nature of the groundwater quality. In this regard, ordinary Kriging, Co-Kriging, and Inverse Weighted Distance (IWD) strategies were applied to develop spatial variability maps, and study the fluctuations in groundwater qualit...

2003
Bernard T. Nolan Arthur L. Baehr

ity in the Glassboro, NJ area (Fig. 1). The Darcian method was used to estimate groundwater recharge Point estimates of groundwater recharge at 48 sediment-coring from water-retention parameters and unsaturated hylocations vary substantially ( 18.5–1840 cm yr 1) in a 930-km2 area of southern New Jersey. Darcian estimates of steady, long-term recharge draulic conductivity on the basis of sedimen...

2007
Fredrik Stenemo

Stenemo, F., 2007. Vulnerability assessments of pesticide leaching to groundwater. Doctoral thesis. ISSN 1652-6880, ISBN 978-91-576-7356-5. Pesticides may have adverse environmental effects if they are transported to groundwater and surface waters. The vulnerability of water resources to contamination of pesticides must therefore be evaluated. Different stakeholders, with different objectives a...

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