Velocity measurements from drifter GPS records are assimilated and used in an ensemble-based inversion technique to extract the river bathymetry. The method is tested on a deep meandering reach and a shallow braided reach of the Kootenai River in Idaho, USA. The Regional Ocean Modeling System (ROMS) is used to model numerous statistically varied bathymetries to create an ensemble of hydrodynamic states. These states, the drifter observations, and the uncertainty of each are combined to form a cost function which is minimized to produce an estimated velocity ���eld. State augmentation is then used to relate the velocity ���eld to bathymetry. Our goals are to assess whether ROMS can accurately reproduce the Kootenai River ���ow to an extent that depth inversion is feasible, investigate if drifter paths are sensitive enough to bottom topography to make depth inversion possible, and to establish practical limitations of the present methodology. At both test sites, the depth inversion method produced an estimate of bathymetry that was more accurate and more skillful than the prior estimate. / Graduation date: 2013

abstract: The Kootenai River landscape of southwestern British Columbia, northwestern Montana and the very northern tip of Idaho helped unify the indigenous Ktunaxa tribe and guided tribal lifestyles for centuries. However, the Ktunaxa bands' intimate connection with the river underwent a radical transformation during the nineteenth century. This study analyzes how the Ktunaxa relationship with the Kootenai River faced challenges presented by a new understanding of the meaning of landscape introduced by outside groups who began to ply the river's waters in the early 1800s. As the decades passed, the establishment of novel boundaries, including the new U.S.-Canadian border and reserve/reservation delineations, forever altered Ktunaxa interaction with the land. The very meaning of the river for the Ktunaxa as a source of subsistence, avenue of transportation and foundation of spiritual identity experienced similar modifications. In a matter of decades, authoritarian lines on foreign maps imposed a concept of landscape far removed from the tribe's relatively fluid and shifting understanding of boundary lines represented by the river at the heart of the Ktunaxa homeland. This thesis draws on early ethnographic work with the Ktunaxa tribe in addition to the journals of early traders and missionaries in the Kootenai region to describe how the Ktunaxa way of life transformed during the nineteenth century. The works of anthropologist Keith Basso and environmental philosopher David Abram are used to develop an understanding of the powerful implications of the separation of the Ktunaxa people from the landscape so essential to tribal identity and lifestyle. Two different understandings of boundaries and the human relationship with the natural world clashed along the Kootenai River in the 1800s, eventually leading to the separation of the valley's indigenous inhabitants from each other and from the land itself. What water had once connected, lines on maps now divided, redefining this extensive landscape and its meaning for the Ktunaxa people. However, throughout decades of dominance of the Western mapmakers' worldview and in spite of the overwhelming influence of this Euro-American approach to the environment, members of the Ktunaxa tribe have been able to maintain much of their traditional culture. / Dissertation/Thesis / M.A. History 2013

A comparative study was made of environmental variables and the density, biomass, diversity, and species composition of macroinvertebrates in areas downstream from a dam with a hypolimnetic release (Hungry Horse Dam on the Flathead River) and a dam with a selective withdrawal system (Libby Dam on the Kootenai River). A major objective of this study was to examine the response of macroinvertebrate communities to defined environmental gradients in temperature, flow, substrate, and food-related variables (periphyton, particulate organic carbon in the seston). In addition, the effects of experimental manipulations in discharge on macroinvertebrate drift and stranding were assessed, and the effects of temperature on the growth rates and emergence of five species of insects were measured.