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Spatial variability of groundwater recharge and its effect on shallow groundwater quality in southern New Jersey

Bernard T. Nolan, Arthur L. Baehr and Leon J. Kauffman
Spatial variability of groundwater recharge and its effect on shallow groundwater quality in southern New Jersey
Vadose Zone Journal (November 2003) 2 (4): 677-691

Abstract

Point estimates of groundwater recharge at 48 sediment-coring locations vary substantially (-18.5-1840 cm yr-1) in a 930-km2 area of southern New Jersey. Darcian estimates of steady, long-term recharge made at depth in the unsaturated zone were estimated using pedotransfer functions of soil texture and interpolated (mapped) with nonparametric methods to assess aquifer vulnerability in the area. The probability of exceeding the median recharge (29.1 cm yr-1) is low in the southwestern and northeastern portions of the study area and high in the eastern and southeastern portions. Estimated recharge is inversely related to measured percentage clay and positively related to the percentage of well-drained soils near wells. Spatial patterns of recharge estimates, exceedance probabilities, and clay content indicate that sediment texture controls recharge in the study area. Relations with land elevation and a topographic wetness index were statistically insignificant. Nitrate concentration and atrazine (6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine) percentage detection in samples of shallow groundwater (typically <10 m) are higher for low recharge sites (29.1 cm yr-1) than for high recharge sites (>29.1 cm yr-1) in agricultural and urban areas. Differences between high and low recharge sites in these areas are highly significant for NO3 concentration, but not for atrazine concentration.


ISSN: 1539-1663
Serial Title: Vadose Zone Journal
Serial Volume: 2
Serial Issue: 4
Title: Spatial variability of groundwater recharge and its effect on shallow groundwater quality in southern New Jersey
Affiliation: U. S. Geological Survey, Reston, VA, United States
Pages: 677-691
Published: 200311
Text Language: English
Publisher: Soil Science Society of America, Madison, WI, United States
References: 35
Accession Number: 2004-026288
Categories: HydrogeologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Accessed on February 4, 2004
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N39°25'00" - N40°00'00", W75°19'60" - W74°40'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200408
Program Name: USGSOPNon-USGS publications with USGS authors
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