Controls on groundwater chemistry in subalpine catchments in the southern interior of British Columbia
Identifieur interne : 003B33 ( Main/Exploration ); précédent : 003B32; suivant : 003B34Controls on groundwater chemistry in subalpine catchments in the southern interior of British Columbia
Auteurs : Robert O. Hudson [Canada] ; Douglas L. Golding [Canada]Source :
- Journal of Hydrology [ 0022-1694 ] ; 1997.
Abstract
The chemistry of groundwater was studied in small subalpine watersheds under different forest cover types at Upper Penticton Creek (UPC). The purpose of the research was to derive a model to predict chemical concentrations of cations, bicarbonate, sulphate and silica in groundwater on the basis of fixed site parameters and seasonally variable parameters. It was shown that sulphate was largely of atmospheric origin, whereas the other chemical species were controlled primarily by mineral weathering. It was found that hydraulic conductivity was the most important site parameter that governed the weathering process. Hydrologic zone, describing whether the site was a hillslope site, streamside site or seepage site, and forest cover type were also important site parameters. Within sites, seasonal variability can be best described by head, a measure of groundwater storage. The range of within-site chemical variability was generally less than that attributable to between-site factors; notable exceptions are sulphate and potassium, both of which are controlled significantly by plant uptake. In the hillslope zone, forest cover was the primary factor controlling seasonal variability due to the relative homogeneity of hydraulic conductivity among the sites tested within that zone. A general site-specific model to predict groundwater chemistry as a function of hydraulic conductivity, forest cover, hydrologic zone and groundwater head is proposed.
Url:
DOI: 10.1016/S0022-1694(97)00029-2
Affiliations:
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Hudson</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>British Columbia Ministry of Forests, Vancouver Region, 2/00 Labieux Road, Nanaimo, B.C. V9T 6E9</wicri:regionArea><wicri:noRegion>B.C. V9T 6E9</wicri:noRegion></affiliation></author><author><name sortKey="Golding, Douglas L" sort="Golding, Douglas L" uniqKey="Golding D" first="Douglas L." last="Golding">Douglas L. Golding</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Faculty of Forestry, University of British Columbia, 2357 Main Mall, Vancouver, B.C. V6T IW5</wicri:regionArea><wicri:noRegion>B.C. V6T IW5</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Hydrology</title><title level="j" type="abbrev">HYDROL</title><idno type="ISSN">0022-1694</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997">1997</date><biblScope unit="volume">201</biblScope><biblScope unit="issue">1–4</biblScope><biblScope unit="page" from="1">1</biblScope><biblScope unit="page" to="20">20</biblScope></imprint><idno type="ISSN">0022-1694</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1694</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The chemistry of groundwater was studied in small subalpine watersheds under different forest cover types at Upper Penticton Creek (UPC). The purpose of the research was to derive a model to predict chemical concentrations of cations, bicarbonate, sulphate and silica in groundwater on the basis of fixed site parameters and seasonally variable parameters. It was shown that sulphate was largely of atmospheric origin, whereas the other chemical species were controlled primarily by mineral weathering. It was found that hydraulic conductivity was the most important site parameter that governed the weathering process. Hydrologic zone, describing whether the site was a hillslope site, streamside site or seepage site, and forest cover type were also important site parameters. Within sites, seasonal variability can be best described by head, a measure of groundwater storage. The range of within-site chemical variability was generally less than that attributable to between-site factors; notable exceptions are sulphate and potassium, both of which are controlled significantly by plant uptake. In the hillslope zone, forest cover was the primary factor controlling seasonal variability due to the relative homogeneity of hydraulic conductivity among the sites tested within that zone. A general site-specific model to predict groundwater chemistry as a function of hydraulic conductivity, forest cover, hydrologic zone and groundwater head is proposed.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Hudson, Robert O" sort="Hudson, Robert O" uniqKey="Hudson R" first="Robert O." last="Hudson">Robert O. Hudson</name></noRegion><name sortKey="Golding, Douglas L" sort="Golding, Douglas L" uniqKey="Golding D" first="Douglas L." last="Golding">Douglas L. Golding</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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