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Seasonal sand level changes on south...

Yates, Marissa L.

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Seasonal sand level changes on southern California beaches.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Seasonal sand level changes on southern California beaches./
作者:	Yates, Marissa L.
面頁冊數:	155 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-01, Section: B, page: 0183.
Contained By:	Dissertation Abstracts International70-01B.
標題:	Physical Geography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3342173
ISBN:	9780549994138

Seasonal sand level changes on southern California beaches.
Yates, Marissa L.

Seasonal sand level changes on southern California beaches. - 155 p.

Source: Dissertation Abstracts International, Volume: 70-01, Section: B, page: 0183.

Thesis (Ph.D.)--University of California, San Diego, 2009.

Seasonal airborne and ground-based observations of sand level changes were made along the coast of southern California from 2001 to 2008. Hourly, high alongshore spatial resolution wave estimates from a network of wave buoys and a spectral refraction wave model complement the sand level change data. Water returns from the ocean surface were removed from the airborne lidar elevation observations with a new method using tide and wave data, which was validated with concurrent in situ surveys. The resultant sand levels show high alongshore variability in seasonal shoreline position change along the 120-km survey region. Alongshore variability in wave energy, geologic factors, and sand grain size are hypothesized to control the alongshore variability of the seasonal shoreline change magnitude.

ISBN: 9780549994138Subjects--Topical Terms:

893400
Physical Geography.

Seasonal sand level changes on southern California beaches.
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500 $a Source: Dissertation Abstracts International, Volume: 70-01, Section: B, page: 0183.
500 $a Adviser: R. T. Guza.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2009.
520 $a Seasonal airborne and ground-based observations of sand level changes were made along the coast of southern California from 2001 to 2008. Hourly, high alongshore spatial resolution wave estimates from a network of wave buoys and a spectral refraction wave model complement the sand level change data. Water returns from the ocean surface were removed from the airborne lidar elevation observations with a new method using tide and wave data, which was validated with concurrent in situ surveys. The resultant sand levels show high alongshore variability in seasonal shoreline position change along the 120-km survey region. Alongshore variability in wave energy, geologic factors, and sand grain size are hypothesized to control the alongshore variability of the seasonal shoreline change magnitude.
520 $a Monthly or more frequent ground-based surveys at four selected focus sites show seasonal shoreline and bathymetry change, with winter shoreline erosion and offshore bar development, and summer shoreline accretion and the loss of the offshore bar. Analysis of surveys completed after a small beach nourishment at Torrey Pines Beach showed the presence of the nourishment through more than one full seasonal cycle.
520 $a Observations from Torrey Pines Beach show the dependence of shoreline change on the initial shoreline position and the wave forcing. The observations motivated the development of an equilibrium shoreline change model, which accurately reproduces the observations with four free parameters. With at least two years of monthly surveys or multiple years of appropriately-timed biannual observations used to determine the free parameters, the model accurately predicts withheld observations and is applied at the additional survey sites. Ongoing work includes applying the model at additional locations and investigating the relationship between the tuned parameters and geologic factors.
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790 1 0 $a Hutchinson, Tara C. $e committee member
790 1 0 $a Seymour, Richard J. $e committee member
790 1 0 $a Winant, Clint $e committee member
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