Page - 371 - in Book of Full Papers - Symposium Hydro Engineering

confirmed due to the limitation of the verifiable data. Moreover, since a hydrophone (length = 2.0 m) is installed at one side near the sidebank of about 72m wide river, it maybe have some difficulties to represent the sediment transport volume calculated by the hydrophone for the entire width of the river. 4) Measurement of topography deformation by interference SAR image analysis is a new technology that rapidly progressed in recent years. In order to obtain accurate data and make precisely analysis, further study and improvement on observation equipment and analysis technique are needed in the future. ACKNOWLEDGEMENTS We sincerely thank the staffs in the Fujikawa SABO office, Kanto Rigional Development Bureau, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan, for their kindly supports in this work. REFERENCES [1] MITUNAGA,T.,MORIYA,T.,UCHIDA,T.,TOMITA,K.,YE, Z. Observation of sediment discharge in the district of Fujikawa Sabo Office. Journal of the Japan Society of Erosion Control Engineering, vol.68,No.1, 2015 (In Japanese) [2] MIZUNO,M.,KAMIYAMA,J.,EKAWA,M.,SATOU,T.,KANBARA,J.,HAYASHI, S. Method of emergency search for the location of landslide dams using high-resolution single-polarization SAR image interpretation, Technical Note of NILIM, No.760,2013 (In Japanese) SUMMARY Taking the middle to downstream section of Omukawa River (extension L = 8.3 km, gradient 1/58) as a study site, A comparison between sediment transport obtained by SAR image interference analysis and sediment discharge observed by hydrophone etc. during 2014-2016 period. The result shows that, although there was data variation, an approximate linear correlation was recognized. The reason of the difference between two data is assumed that sediment discharge is measured only at the downstream end with a length L= 2.0 m, with respect to the river width of 72 m, which is not adequate for representing the entire river cross section. 371