Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [136]-147).

Thesis (Ph. D.)--Dept. of Geosciences and Dept. of Chemistry. University of Missouri--Kansas City, 2005. / "A dissertation in geosciences and chemistry." Advisor: James B. Murowchick. Typescript. Vita. Description based on contents viewed June 26, 2006; title from "catalog record" of the print edition. Includes bibliographical references (leaves 227-245). Online version of the print edition.

Thesis (M.S.)--Humboldt State University, 2007. / Includes bibliographical references (leaves 74-79). Also available via Humboldt Digital Scholar.

Thesis (Ph. D.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 238-244). Also available on the World Wide Web.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 55-68). Also available via the Internet.

The Upper Souris River was placed on the Environmental Protection Agencies (EPA) impaired waters list for low dissolved oxygen (DO). A Total Maximum Daily Load (TMDL) study was conducted to determine possible causes of DO depletion. From sampling and site visits it was determined nonpoint sources contributed the majority of organic loadings to the Upper Souris River. Through preliminary testing, it was determined that sediment oxygen demand (SOD) played a key role in depleting DO levels during winter months and required further investigation. River profile surveying, water quality sampling, and laboratory testing of SOD were carried out to determine parameters required for water quality modeling. SOD tests were conducted to determine impacts of sediment organic contents and temperature on SOD rate. Sediment oxygen demand rates ranged from 0.37 to 1.22 g O2/m2/d. The QUAL2K model was calibrated to simulate DO variations along the study reach under ice covered conditions.

published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy

The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on January 19, 2010). Thesis advisor: Dr. Charles F. Rabeni. Includes bibliographical references.

Large, infrequent "episodic" sediment transfers are commonly considered differently from "normal-regime" sediment-transfer activity. For example, in the important hillslope-gully-stream sediment cascade pathway in coastal British Columbia, debris slides and debris torrents are considered as "episodic events". On the other hand, lower-magnitude hillslope to gully-channel sediment transfers and fluvial sediment tranSport within gully and stream channels are usually considered as "normal-regime" activity, represented by annual yields. However, the results of this study illustrate the highly episodic nature of normal-regime fine-sediment transfers, which are closely linked to hydrometeorological and sediment-supply conditions. The results indicate that qualitative modelling of fine-sediment transfer activity, at the synoptic or event scale, should be possible based upon hydrometeorological and sediment-supply information. From such a model ~ the elements of which are presented in the concluding chapter ~ fine-sediment transfer activity could be forecast based upon regional weather forecasts. The study was conducted in Russell Creek Basin, on northern Vancouver Island, British Columbia. Fine-sediment transfer activity was monitored at a nested hierarchy of sites representing fine-sediment transfers from unstable hillslopes to a gully channel, suspended sediment transport out of the unstable gully and a nearby stable gully, and suspended sediment transport in Russell Creek near the mouth. Russell Creek Basin is located within Tsitika Watershed, which is the site of a British Columbia Ministry of Forests study dedicated to determining relative fine-sediment contributions from natural and logging-related sediment sources. The results of the Russell Creek study indicate that an event-based sediment sampling program is desirable and that at least some automated sampling is required. Furthermore, development of a qualitative sediment-transfer activity forecast model would be useful in interpretation of sample data and would allow efforts to be concentrated during the periods of greatest sediment-transfer activity.

Thesis (M.S.)--University of Delaware, 2008. / Principal faculty advisor: Michael A. O'Neal, Dept. of Geography. Includes bibliographical references.