Floodplain assessment for the Teklanika and Toklat River project reaches in Denali National Park and Preserve, Alaska

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Schalk, Brian N.
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URI
http://hdl.handle.net/11122/5942
Abstract
The National Park Service (NPS) is required to assess risks of flooding to existing and proposed structures within the boundaries of the NPS system. Within Denali National Park and Preserve (DNP & P), there are several large, braided rivers that require floodplain management. The objective of this investigation is to provide DNP & P with guidelines and methods that apply fluvial geomorphic, hydrologic, and hydraulic analysis in order to delineate flood hazard zones on this type of stream. Data collected from Teklanika and Toklat Rivers were used to develop a return period versus flood depth/bankfull depth curve and assess potential streambank erosion. Site specific data combined with this curve will enable NPS personnel to easily approximate flood hazard zones for the project reaches. The method can be applied to assess other flood hazard zones associated with other braided rivers with similar characteristics.
Description
Thesis (M.S.) University of Alaska Fairbanks, 2005
Table of Contents
Introduction -- Literature review -- Study areas -- Floodplain delineation -- Lateral erosion -- Flood hazard zone assessment and risk analysis for the Teklanika and Toklat rivers -- Conclusions and recommendations -- References -- Appendix A : Teklanika River HEC-RAS generated run data for the 1.5-, 10-, 50-, 100-, and 500-year flood events -- Appendix B. Teklanika River HEC-RAS generated cross-sections for the 1.5-, 10-, 50-, 100-, and 500-year flood events -- Appendix C. Toklat River HEC-RAS generated run data for the 1.5-, 10-, 50-, 100-, and 500-year flood events -- Appendix D. Toklat River HEC-RAS generated cross-sections for the 1.5-, 10-, 50-, 100-, and 500-year flood events -- Appendix E. Rosgen classification key for natural rivers -- Appendix F. Bank erodibility hazard rating guide -- Appendix G. Aerial photographs of the Teklanika and Toklat rivers -- Appendix H. Historical streamflow daily values graph for the Teklanika river near Lignite, Alaska.
Date
2005-05
Type
Thesis
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