Isotope hydrology and baseflow geochemistry in natural and human-altered watersheds in the Inland Pacific Northwest, USA

 

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Detalles Bibliográficos
Autores: Sanchez-Murillo, Ricardo, Brooks, Erin S., Elliot, William, Boll, Jan
Formato: artículo
Fecha de Publicación:2015
Descripción:This study presents a stable isotope hydrology and geochemical analysis in the inland Pacific Northwest (PNW) of the USA. Isotope ratios were used to estimate mean transit times (MTTs) in natural and human-altered watersheds using the FLOWPC program. Isotope ratios in precipitation resulted in a regional meteoric water line of δ2H = 7.42·δ18O + 0.88 (n = 316; r2 = 0.97). Isotope compositions exhibited a strong temperature-dependent seasonality. Despite this seasonal variation, the stream δ18O variation was small. A significant regression (τ = 0.11D−1.09; r2 = 0.83) between baseflow MTTs and the damping ratio was found. Baseflow MTTs ranged from 0.4 to 0.6 years (human-altered), 0.7 to 1.7 years (mining-altered), and 0.7 to 3.2 years (forested). Greater MTTs were represented by more homogenous aqueous chemistry whereas smaller MTTs resulted in more dynamic compositions. The isotope and geochemical data presented provide a baseline for future hydrological modelling in the inland PNW.
País:Repositorio UNA
Institución:Universidad Nacional de Costa Rica
Repositorio:Repositorio UNA
Lenguaje:Inglés
OAI Identifier:oai:null:11056/17894
Acceso en línea:http://hdl.handle.net/11056/17894
Palabra clave:BASEFLOW GEOCHEMISTRY
HYDROGEN-2
ISOTOPE HYDROLOGY
MEAN TRANSIT TIMES
CUENCAS HIDROGRÁFICAS
HIDROLOGÍA
ISOTOPOS
GEOQUÍMICA