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http://dx.doi.org/10.7780/kjrs.2010.26.2.115

Observation of Ridge-Runnel and Ripples in Mongsanpo Intertidal Flat by Satellite SAR Imagery  

Jang, So-Yeong (Department of Geophysics, Kangwon National University)
Han, Hyang-Sun (Department of Geophysics, Kangwon National University)
Lee, Hoon-Yol (Department of Geophysics, Kangwon National University)
Publication Information
Korean Journal of Remote Sensing / v.26, no.2, 2010 , pp. 115-122 More about this Journal
Abstract
In this study, we analyzed ridge-runnel structure and ripple marks by using Envisat ASAR, JERS-1 SAR images and in-situ data in Mongsanpo intertidal flat located in Taean-Gun, Korea. A group of light-and-dark lines parallel to the shoreline, alternating 3-5 times, were observed in the intertidal flat in Envisat ASAR images. The patterns are related to ridge-runnel structure in the intertidal flat exposed to air. Well-drained runnels, typically with ripple marks, showed strong backscattering while runnels submerged by surface water or ridges, typically smooth with no ripple, have weak backscattering coefficients in Envisat ASAR images. In JERS-1 SAR images, however, the backscattering was very low on the entire intertidal flat and no ridge-runnel structure could be observed. The wavelengths of ripple marks measured from in-situ observations have ranges from 4 to 10 cm that satisfies the Bragg scattering condition of the 1st-order in Envisat ASAR images operating in C-band, but not in JERS-1 SAR that used L-band. Through this study using SAR images, we could successfully analyze the sedimentary conditions of intertidal flats with ridge-runnel and ripple marks which are not easily observed by optical sensors. It is expected that the results of this study with SAR images will contribute to the sedimentary research over intertidal flats.
Keywords
ripple mark; ridge-runnel; intertidal flat; SAR; Bragg scattering;
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Times Cited By KSCI : 2  (Citation Analysis)
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