Graduate Thesis Or Dissertation
 

Hydrology and delineation in four wetlands in the Oregon Cascades

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  • Four wetland sites were identified and delineated in Silver Falls State Park, Oregon using procedures outlined in the 1989 Federal Manual for the Identification and Delineation of Jurisdictional Wetlands and subsequently monitored for a ten month period. A network of 225 shallow (32") wells was installed throughout the sites to track the subsurface hydrology over a full wet season. In order to scrutinize the growing season, plant phenologies and soil temperatures were observed from senescence in the late fall to full vigor in the spring. The study concurs with the concept and intent of the 1989 Manual, but presents the view that a number of improvements are necessary. The major areas requiring improvement include techniques used to assess the prevalence index of plant communities, the definition of the growing season and the recognition of the interactive involvement with and dependence upon the wetland environment of faunal organisms. Further, the protection of an influence zone may be important to the maintenance of the intact hydrologic system upon which the wetland depends.
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file details MacLeod_Norman_A_1992.pdf 2017-08-14 Pubblico Scaricare