Portland State University. Department of Geography
Daniel M. Johnson
Date of Award
Master of Science (M.S.) in Geography
1 online resource (111 p.)
Hydrology -- Oregon, Lake ecology -- Oregon
Natural lake-watershed ecosystems in Oregon compose a diverse and valuable assemblage of land and water resources. With an increasing demand on lakes for recreation, water supplies, and aesthetic values and an increase in available data on Oregon lake systems, there is a need for applicable and timely scientific water management information about lake conditions statewide. This thesis is an attempt to summarize some of the data collected on natural Oregon lake-watershed ecosystems.
The purpose of the thesis is to identify the most typical natural systems out of an initial data base of twenty-four variables, measured over ninety-eight lake-watershed ecosystems. The selected variables are reduced to five common factors using principal components factor analysis. K-means cluster analysis is used to create similar groups of lake systems. These groups are compared to ecoregions in Oregon and a typical, representative lake ecosystem is identified for each group. Results show that several lake systems of the state are unique.
Jones, Randall Alan, "Classifying Oregon lake-watershed ecosystems for regional water resources assessment" (1987). Dissertations and Theses. Paper 3712.