Isotope hydrology and baseflow geochemistry in natural and human-altered watersheds in the Inland Pacific Northwest, USA
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| المؤلفون: | , , , |
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| التنسيق: | artículo |
| تاريخ النشر: | 2015 |
| الوصف: | 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. |
| البلد: | Repositorio UNA |
| المؤسسة: | Universidad Nacional de Costa Rica |
| Repositorio: | Repositorio UNA |
| اللغة: | Inglés |
| OAI Identifier: | oai:null:11056/17894 |
| الوصول للمادة أونلاين: | http://hdl.handle.net/11056/17894 |
| كلمة مفتاحية: | BASEFLOW GEOCHEMISTRY HYDROGEN-2 ISOTOPE HYDROLOGY MEAN TRANSIT TIMES CUENCAS HIDROGRÁFICAS HIDROLOGÍA ISOTOPOS GEOQUÍMICA |