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KMID : 1024520150240040359
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Journal of the Environmental Sciences
2015 Volume.24 No. 4 p.359 ~ p.369
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Comparative Analysis of Day and Night Time Video Accuracy to Calculate the Flood Runoff Using Surface Image Velocimeter (SIV)
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Kim Yong-Seok
Yang Sung-Kee
Yu Kwon-Kyu
Kim Dong-Su
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Abstract
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This study analyzed the velocimetry of runoff and measured the flood discharge by applying the SIV (Surface Image
Velocimetrer) to the daytime and nighttime flow image data with special reference to Seong-eup Bridge at Cheonmi stream of Jeju during the flow by the severe rainstorm on May 27, 2013.
A 1000W lighting apparatus with more than 150 lux was installed in order to collect proper nighttime flow image applied to
the SIV. Its value was compared and analyzed with the velocity value of the fixed electromagnetic wave surface velocimetry(Kalesto) at the same point to check the accuracy and applicability of the measured velocity of flow.
As a result, determination coefficient values were 0.891 and 0.848 respectively in line with the velocity distribution of
the daytime and nighttime image and the flow volume measured with Kalesto was approximately 18.2% larger than the value measured with the SIV.
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KEYWORD
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Surface Image Velocimetry, CCTV, Kalesto, Doppler radar, Surface velocity
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