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Accueil du site → Master → Etats Unis → 2000 → Influences of alluvial fans on local channel geomorphology, incision and vegetation dynamics in the Toiyabe, Toquima and Monitor ranges of central Nevada

University of Nevada, Reno (2000)

Influences of alluvial fans on local channel geomorphology, incision and vegetation dynamics in the Toiyabe, Toquima and Monitor ranges of central Nevada

Davis, Catherine Anne

Titre : Influences of alluvial fans on local channel geomorphology, incision and vegetation dynamics in the Toiyabe, Toquima and Monitor ranges of central Nevada

Auteur : Davis, Catherine Anne

Université de soutenance : University of Nevada, Reno

Grade : Master of Science (MS) 2000

Résumé
Riparian ecosystems compose <1-2% of the semi-arid west. Stream incision lowers the water tables which support riparian vegetation leading to a loss riparian habitat. Incision has dominated fluvial processes in the central Nevada mountains for the past 200-300 years. The rate of this incision may be affected by side valley alluvial fans. In 1998 multivariate analysis of channel incision since 1995 against geomorphic and vegetative characteristics showed that narrower, deeper channels with less bank vegetation, more willows on the lowest terrace, and more armored channel beds experienced greater incision. In 1999 channel cross sections above, at and below alluvial fans were analyzed using discriminant analysis. The at fan cross sections had characteristics similar to the more incised sites from the 1998 data. This indicates that alluvial fans affected the rate of stream incision and should be addressed in future management of riparian areas.

Mots clés : Ecology, Hydrology, Geography, Biological sciences, Earth sciences

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Page publiée le 20 février 2015, mise à jour le 5 novembre 2018