RESPONSE CHARACTERISTICS OF RIVER MOUTH TOPOGRAPHY IN WIDE TIME SCALE RANGE

Abstract

Based on the observations, response characteristics of sand barrier and flood terrace for the Abukuma River mouth are analyzed in wide time scale range spanned from several hours to half century. We propose some measures representing magnitude of the deformation and the external forces to find quantitative relationship between them. The analyses deal with breaching in the flood process, development of the sand barrier, alternation of the barrier side, and the formation and decay of flood terrace, together with their time scales. There will be also shown interaction between the barrier and the terrace.