小型音響測深システムによる 留萌川下流部河床形状の観測調査

抄録

In this study, a brief bathymetric system which was designed for observing bedform evolution under flood conditions was proposed. The system consists of a RTK-GPS system and a commercially available fish finder, and it was installed on a radio-control air boat. The proposed system is able to be built at a very low price comparing to existing systems employing other professional acoustic bathymetric instruments or multi-beam bathymetric systems. Also, the system is expected to improve the safety of observation of bedforms under flood conditions by using a radio control platform. The proposed system was applied to observe the river bed topography in Rumoi River in Hokkaido, Japan. The result shows that the bed topography observed by the proposed system is qualitatively accurate, and the results of the wavenumber analysis of the observed bed elevation along the downstream direction shows good agreement with that by using the existing multi-beam survey data.