Waters of various salinities were secured from the Umpqua estuary, the Umpqua River, and the open ocean near the mouth of the estuary. The rate of oxidation of sulfides in these various waters was investigated to assess the potential longevity of free sulfides in estuarine waters. The rate of disappearance of sulfides showed no simple relationship with salinity. Estuarine water exhibited the fastest rate of oxidation with decreasing rates observed in river water and open ocean water. The effects of aged water samples on the oxidation rate of sulfides were investigated. The results indicated that fresher samples exhibit a faster oxidation rate than aged samples in estuarine, open ocean, and river water. / Graduation date: 1973

No description available.

No description available.

Thesis (M.S.)--Oregon State University, 1964. / Typescript. Includes bibliographical references (leaves 77-80). Also available via the World Wide Web.

The overriding goal of this study was to provide first order estimates of dilution and tidal flushing of waste discharges released hypothetically into various Oregon estuaries during critical low flows and tides. Causal relationships between discharged wastes and subsequent estuarine response were studied. Various approaches to determine the assimilative capacity of tidal estuaries were described and applied to ten of Oregon's estuaries for which limited hydraulic flow information was available. This study mainly focused on the well-mixed condition common to most of Oregon's estuaries. The characteristics of the estuary used in the calculations were: tidal volumes, river flow, topography, and salinity information. Comparison of results from the modified tidal prism method and fraction of freshwater method for determining tidal flushing was made. Stommel's and Thomann's one-dimensional model was used to predict the spatial pollutant distribution from a waste outfall discharging into an estuary. Flushing rates in an overmixed estuary were determined using Gibson's method as well as flushing times calculation for a marina-like small basin. / Graduation date: 1976

Thesis (Ph. D.)--Oregon State University, 1982. / Typescript (photocopy). Includes bibliographical references (leaves 119-128). Also available on the World Wide Web.

Thesis (Ph.D.)--Aberdeen University, 2009. / Title from web page (viewed on July 23, 2009). Includes bibliographical references.

Thesis (Ph. D.)--University of Connecticut, 1996. / Includes bibliographical references (leaves 234-242).

The funnel-shaped Mgeni Estuary, at the mouth of the fourth largest river along the KwaZulu- Natal coast, discharges into the Indian Ocean in the northern suburbs of Durban. This system is under considerable anthropogenic stress associated with modern development and industrialisation, both adjacent to the estuary and in the catchment area. The construction of Inanda Dam in 1989, immediately upstream of the estuary, is considered to have had an irreversible impact on the system and the estuary and is addressed in this study. A thorough analysis of available maps, aerial photographs and oblique images from 1860 to 2006, provided a record of the changes in the estuary morphology. The Pre-Inanda Dam period is characterised by the repeated re-establishment of a large central bar after major floods as evident prior to the 1987 flood. The post 1989 Inanda-Dam period, however, is characterised by the deposition of a series of side-attached bars and the development of extensive mudflats. Sediment distribution results show a definite decrease in grain size compared to the predominant gravel fraction in 1986 towards an estuary dominated by medium to fine sand-sized sediment. A reduction in sediment grain size is also complemented by an increase in carbonate concentration throughout the estuary. This indicates an increase in marine incursion with decreased fluvial flow suggesting a shift from a river dominated estuary to a marine dominated system since the completion of Inanda Dam. Linked to the finer grained sediment is a higher increased organic and heavy metal concentration. An analysis of the enrichment factor for 9 metals shows that the Mgeni Estuary is significantly contaminated, especially at the head of the estuary. This situation is exacerbated by decreased fluvial flow rates, an increase in the frequency of mouth closures and the reduction in flooding events effectively preventing the removal of contaminants out of the estuary. / Thesis (M.Sc.)-University of KwaZulu-Natal, Westville, 2009.

No description available.