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A system for video observation of ne...

DeMunda, Todd J.

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A system for video observation of nearshore processes.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A system for video observation of nearshore processes./
作者:	DeMunda, Todd J.
面頁冊數:	155 p.
附註:	Adviser: James Kirby.
Contained By:	Masters Abstracts International45-03.
標題:	Engineering, Civil. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1440606

A system for video observation of nearshore processes.
DeMunda, Todd J.

A system for video observation of nearshore processes. - 155 p.

Adviser: James Kirby.

Thesis (M.C.E.)--University of Delaware, 2007.

A video camera system has been deployed in Bethany Beach, DE for the purpose of observing nearshore processes. The system captures several types of still images as well as video streams at regular intervals. The imagery can be used in the scientific analysis of coastal dynamics such as the prediction of rip currents or estimation of wave speed.Subjects--Topical Terms:

783781
Engineering, Civil.

A system for video observation of nearshore processes.
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500 $a Source: Masters Abstracts International, Volume: 45-03, page: 1575.
502 $a Thesis (M.C.E.)--University of Delaware, 2007.
520 $a A video camera system has been deployed in Bethany Beach, DE for the purpose of observing nearshore processes. The system captures several types of still images as well as video streams at regular intervals. The imagery can be used in the scientific analysis of coastal dynamics such as the prediction of rip currents or estimation of wave speed.
520 $a Multiple video streams are rectified and velocity fields are estimated using MatPIV, a MATLAB implementation of particle image velocimetry. The maximum velocity calculated at each point is assumed to be the local wave phase speed, and this value is used to calculate the local depth according to long wave theory. This bathymetry is compared to tide-corrected survey bathymetry to determine the accuracy of the depth-inversion.
520 $a The depth inversion appears to produce the best results when and where the incoming waves are either clearly visible and long-crested, or hardly visible at all. Uniform lighting appears to be ideal. In these regions, the calculated beach slope and depth match up with the survey bathymetry very well. Offshore, the inversion begins to fail possibly due to the diminishing visibility of the waves. Breaking waves and swash zone velocities produce false deep zones in the calculated bathymetry. Glare from the sun washes out the surface and movement cannot be accurately detected. Sunshine or clouds seem to not matter, as long as the sea surface is smooth and uniform.
590 $a School code: 0060.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Engineering, Marine and Ocean. $3 1019064
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690 $a 0547
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710 2 $a University of Delaware. $3 1017826
773 0 $t Masters Abstracts International $g 45-03.
790 $a 0060
790 1 0 $a Kirby, James, $e advisor
791 $a M.C.E.
792 $a 2007
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