ISSN:
1573-515X
Keywords:
GIS
;
GWLF
;
nonpoint source pollution
;
nutrient
;
watershed modeling
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
Notes:
Abstract We modeled nutrient export in the ChoptankRiver Basin on the coastal plain of the Chesapeakedrainage, using a modified version of alumped-parameter, hydrochemical model (GWLF).Calibration was performed using long-term (WY1980–WY1990)hydrochemistry data from a gauged site. Thecalibrated model reproduced water yields, TN, and TPexport with cumulative errors of 〈1% over the11-year calibration period and with annual RMS errorsof 10–50%. Model validation was done withindependent measurements at the same gauged site(WY1991 to WY1996) and at another nearby independentlygauged site (WY1991 to WY1995). Local adjustment ofthe groundwater recession coefficient and thedissolved N concentration in agricultural stormflowwas essential for successful application at the secondsite. GWLF appears to be a useful model for estimationof fluxes of water, N and P from ungauged areas withaccuracies of 10–50% at annual time scales.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006375530844
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