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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

Downstream Variability of Fluvial Form, Process, and Character in a Small Deglaciated Watershed, Southern Ontario

Thayer, James Benjamin 27 November 2012 (has links)
Many deglaciated watersheds possess complex longitudinal profiles and spatially variable sediment sources derived from the last glaciation. Accordingly, downstream patterns in fluvial forms and characteristics of the channel and floodplain may diverge from conventional ‘graded’ watershed models where channel slope decreases downstream. Within a small, deglaciated watershed, five distinct fluvial forms were identified and it was found that the watershed is organized in a spatially variable, but generally inverted arrangement with stable, low-energy forms dominating the upper watershed and more dynamic, high-energy forms in the lower watershed. As a consequence of this inverted and variable downstream succession, and the spatially erratic organization of glacial sediment sources, downstream trends in channel and floodplain characteristics are poorly defined, and in many cases, deviate from expected trends. This is most true for sedimentological variables where multiple co-dominant controls exist, while morphological and hydrological variables better conform to expected downstream trends.
62

Downstream Variability of Fluvial Form, Process, and Character in a Small Deglaciated Watershed, Southern Ontario

Thayer, James Benjamin 27 November 2012 (has links)
Many deglaciated watersheds possess complex longitudinal profiles and spatially variable sediment sources derived from the last glaciation. Accordingly, downstream patterns in fluvial forms and characteristics of the channel and floodplain may diverge from conventional ‘graded’ watershed models where channel slope decreases downstream. Within a small, deglaciated watershed, five distinct fluvial forms were identified and it was found that the watershed is organized in a spatially variable, but generally inverted arrangement with stable, low-energy forms dominating the upper watershed and more dynamic, high-energy forms in the lower watershed. As a consequence of this inverted and variable downstream succession, and the spatially erratic organization of glacial sediment sources, downstream trends in channel and floodplain characteristics are poorly defined, and in many cases, deviate from expected trends. This is most true for sedimentological variables where multiple co-dominant controls exist, while morphological and hydrological variables better conform to expected downstream trends.
63

Urban floodplain land-use - acceptable risk? : A case study of flood risk perception on the Guragunbah (Carrara-Merrimac) floodplain, Gold Coast

Godber, Allison Maree January 2005 (has links)
In Australia, the developments of hazard-specific legislation, policy and guidelines aims to minimise community exposure to the adverse effects of natural hazards. This occurs under policies of ecologically sustainable development land-use planning processes, which must also now involve the assessment of hazard-risk. However the development occurring in potentially hazardous environments, for example urban floodplains susceptible to flooding, continues to occur as a result of contemporary land-use planning and risk management processes. Why is this an outcome of past and present risk management and land-use planning processes? This thesis finds that a significant factor contributing to this outcome is the discrepancy between the perception and management of risk, particularly acceptable risk, by stakeholders (Local Government, the development industry, risk managers and floodplain occupants). The research is based on an Australian example of an urban floodplain currently under considerable development pressure, but at risk from flooding – Guragunbah (Carrara Merrimac Floodplain) and surrounding suburbs within the Nerang River catchment on the Gold Coast. A case study methodology was adopted, involving a combination of survey data and secondary documents. A basis for the thesis was the modelling of the actual risk decision-making processes operating within the case study Local Government, and the comparison between actual observed process and the theoretical framework outlined by the existing hazard risk management and land-use planning policy, guidelines and legislation. This enabled the identification of key stakeholders and their roles within the risk management and land-use planning processes operating within the case study area. The scope of the results of this thesis indicate that a large proportion of stakeholders external to the Local Government (such as residents and some members of the development industry) do not understand the risks of flooding represented by the standards formally adopted by local government (1-in-100 year flood, for example) and as a result, misinterpret their levels of flood risk exposure. Importantly, the results also indicate that contrasts exist in the flood risks considered to be ‘acceptable’ by the stakeholders, particularly when the potential consequences associated with events are described or illustrated in ‘non-technical’ terms. The extent to which the formal standards are misinterpreted suggests that many stakeholders may potentially be exposed to risks greater than they consider to be ‘acceptable’, but they are assuming that the Local Government (in particular) is setting risk standards that are acceptable to them. The thesis questions the true ‘acceptability’ of the formal standards being adopted through floodplain management policy at the Local, State and Federal levels of Government and identifies management opportunities and constraints in addressing the issue. Obstacles to management change include resource availability, lack of political will and stakeholder consultation. Opportunities for management change include modifying: the approach adopted by Local Governments when constructing planning schemes; the existing planning standards and decisions associated with permissible individual land-use; the mitigation of existing flood risks and exposure; and the communication of flood risk information. In the ‘real-world’ Local Government context, as illustrated by this case study, the issue may be practically addressed by modifying the standards and processes followed to establish acceptable risk.
64

Riparian restoration an option for voluntary buyout lands in New Braunfels, TX /

Harter, Jana L. January 1900 (has links)
Thesis (M.A.G.)--Texas State University-San Marcos, 2007. / Vita. Appendices: leaves 40-51. Includes bibliographical references (leaves 52-56).
65

Eucalypt regeneration on the Lower Murray floodplain, South Australia /

George, Amy Kathryn. January 2004 (has links) (PDF)
Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, Discipline of Environmental Biology, 2005? / "September 2004" Bibliography: p. 145-159.
66

Heifer performance and drought and grazing effects on flood meadow vegetation /

Nixon, David Eugene, January 1994 (has links)
Thesis (M.S.)--Oregon State University, 1994. / Typescript (photocopy). Includes bibliographical references (leaves 40-46). Also available on the World Wide Web.
67

Ecological survey and interpretation of the Willamette Floodplain Research Natural Area, W.L. Finley National Wildlife Refuge, Oregon /

Streatfeild, Rosemary. January 1995 (has links)
Thesis (M.S.)--Oregon State University, 1995. / Typescript (photocopy). Includes bibliographical references (leaves 106-111). Also available via the World Wide Web.
68

Eucalypt regeneration on the Lower Murray floodplain, South Australia

George, Amy Kathryn. January 2004 (has links)
Thesis (Ph. D.)--University of Adelaide, 2004. / Title from PDF t.p. (viewed on Sept. 25, 2005). Includes bibliographical references (p. 145-159).
69

Annual exceedance probability analysis /

Gardner, Masako Amai, January 2005 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Civil and Environmental Engineering, 2005. / Includes bibliographical references (p. 65-66).
70

Riparian restoration : an option for voluntary buyout lands in New Braunfels, TX /

Harter, Jana L. January 1900 (has links)
Thesis (M.A.G.)--Texas State University-San Marcos, 2007. / Vita. Appendices: leaves 40-51. Includes bibliographical references (leaves 52-56).

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