Page - 365 - in Book of Full Papers - Symposium Hydro Engineering

Fig. 4 Annual volume of sediment discharge by observation Table 1 Sediment volume observed by hydrophone and trap pit Fig. 5 Ratio of the lower limit grain diameter by hydrophone observation to the measurement in pit sedimentation 2.3. ESTIMATION OF SEDIMENT TRANSPORT BY SAR IMAGE ANALYSIS 2.3.1. SAR image data and analysis period In the SAR image analysis, a SAR sensor mounted on an artificial satellite sends microwave obliquely to the ground surface and receives backscatter. The image data are obtained by receiving backward scattering from the ground surface. By interference analysis of two observed SAR images next to each other, the ground displacement that occurred during the observation period can be 0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 2011 2012 2013 2014 2015 2016 2017 Suspended load measured by turbidimeter Bedload observed by hydrophone in 2m length Subject flood 1961 159 79.5 344.5 4335.0 3166.4 3348.3 3322.7 45.2% 5.0% 2.3% 10.4% 2688 301.0 354.9 697.8 2298 79.2 70.3 99.7 2124 12.7 30.5 66.5 2037 6.33 3.0 49.8 Hydrophone passage sediment discharge volume Whd (kg) Pit-captured sediment Wpt (kg) Weight ratio Whd/Wpt (%) Wp1 (p1 1mm) Wp2 (p2 2mm) Wp3 (p3 3mm) Wp4 (p4 4mm) Pit-captured sedimentweight over the lower limit grain diameter 2013 Typhoon No. 26 (Oct. 15-16, 2013) 2013 Typhoon No. 18 (Sep. 16, 2013) 2014 Typhoon No. 18 (Oct. 5-6, 2014) 2014 Typhoon No. 19 (Oct. 13-14, 2014) 365