Hydrologic and biogeochemical controls of river subsurface solutes under agriculturally enhanced ground water flow

Journal of Environmental Quality
By: , and 

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Abstract

The relative influences of hydrologic processes and biogeochemistry on the transport and retention of minor solutes were compared in the riverbed of the lower Merced River (California, USA). The subsurface of this reach receives ground water discharge and surface water infiltration due to an altered hydraulic setting resulting from agricultural irrigation. Filtered ground water samples were collected from 30 drive point locations in March, June, and October 2004. Hydrologic processes, described previously, were verified by observations of bromine concentrations; manganese was used to indicate redox conditions. The separate responses of the minor solutes strontium, barium, uranium, and phosphorus to these influences were examined. Correlation and principal component analyses indicate that hydrologic processes dominate the distribution of trace elements in the ground water. Redox conditions appear to be independent of hydrologic processes and account for most of the remaining data variability. With some variability, major processes are consistent in two sampling transects separated by 100 m.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Hydrologic and biogeochemical controls of river subsurface solutes under agriculturally enhanced ground water flow
Series title Journal of Environmental Quality
DOI 10.2134/jeq2008.0448
Volume 38
Issue 5
Year Published 2009
Language English
Publisher ACSESS
Contributing office(s) California Water Science Center
Description 11 p.
First page 1830
Last page 1840
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