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Patterns and potential solutions to ...

Smith, Jacquelyn R.

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Patterns and potential solutions to coastal geohazards at Golovin, Alaska.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Patterns and potential solutions to coastal geohazards at Golovin, Alaska./
作者:	Smith, Jacquelyn R.
面頁冊數:	108 p.
附註:	Source: Masters Abstracts International, Volume: 53-04.
Contained By:	Masters Abstracts International53-04(E).
標題:	Geological engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1558388
ISBN:	9781303978319

Patterns and potential solutions to coastal geohazards at Golovin, Alaska.
Smith, Jacquelyn R.

Patterns and potential solutions to coastal geohazards at Golovin, Alaska. - 108 p.

Source: Masters Abstracts International, Volume: 53-04.

Thesis (M.S.)--University of Alaska Fairbanks, 2014.

This item must not be sold to any third party vendors.

The objective of this research is to measure the localized potential for shoreline change and flooding on the Golovin spit, Alaska. Long-term trends of shoreline change have been measured using multi-temporal aerial photography and satellite imagery from 1972-2013, while seasonal and annual changes in shoreline geometry have been measured by re-surveying the beach in July 2012, July 2013, and October 2013. The local bathymetry was updated with data derived from the WorldView-2 satellite to increase the spatial resolution of nearshore topography. These inputs were then integrated to establish an XBeach 1-dimensional numerical model connecting offshore storm water elevations to nearshore dynamics. The spit was found to experience episodic erosion of beach sediments, followed by sediment accretion. This resulted in a dynamic position of the shoreline, with no long-term trend in either the offshore or landward directions. Modeled storms resulted in inundation of low elevations of the spit at a 5-year return interval, with inundation of infrastructure on a 25-year return interval. The modeled results suggest overwash of the entire spit at the 50-100-year return interval. All models were based on the best available forcing data from hindcast modeling. Reinforcing and increasing the elevation of a temporary berm and/or a permanent levee structure, using a 25-year return interval as a design parameter, would help to reduce localized flooding on the spit, and may be considered in the future.

ISBN: 9781303978319Subjects--Topical Terms:

2122713
Geological engineering.

Patterns and potential solutions to coastal geohazards at Golovin, Alaska.
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500 $a Source: Masters Abstracts International, Volume: 53-04.
500 $a Adviser: Debasmita Misra.
502 $a Thesis (M.S.)--University of Alaska Fairbanks, 2014.
506 $a This item must not be sold to any third party vendors.
520 $a The objective of this research is to measure the localized potential for shoreline change and flooding on the Golovin spit, Alaska. Long-term trends of shoreline change have been measured using multi-temporal aerial photography and satellite imagery from 1972-2013, while seasonal and annual changes in shoreline geometry have been measured by re-surveying the beach in July 2012, July 2013, and October 2013. The local bathymetry was updated with data derived from the WorldView-2 satellite to increase the spatial resolution of nearshore topography. These inputs were then integrated to establish an XBeach 1-dimensional numerical model connecting offshore storm water elevations to nearshore dynamics. The spit was found to experience episodic erosion of beach sediments, followed by sediment accretion. This resulted in a dynamic position of the shoreline, with no long-term trend in either the offshore or landward directions. Modeled storms resulted in inundation of low elevations of the spit at a 5-year return interval, with inundation of infrastructure on a 25-year return interval. The modeled results suggest overwash of the entire spit at the 50-100-year return interval. All models were based on the best available forcing data from hindcast modeling. Reinforcing and increasing the elevation of a temporary berm and/or a permanent levee structure, using a 25-year return interval as a design parameter, would help to reduce localized flooding on the spit, and may be considered in the future.
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