Abstract
We surveyed microtopography by a 3D terrestrial laser scanner in the mouse of the Onosato River, Osaka at the ebb in April 28 2006. We made out Digital Surface Model (DSM) from acquired point data, and analyzed shifting in the area of the land and the exposure time as tide level change using the tidal data. As a result, we had been able to survey elevation at a resolution of 1cm interval. The estimated area of the intertidal zone was 3.35ha at the Onosato River, 25.8% of the area was distributed from 30cm to 60cm elevation, and the slope was less than 2 degrees at 36.6% of the area. We found tide level shown the two different tendencies to change by hour and month from the tidal data, and these central elevations were 29cm and 43cm. The monthly gap of the flooded rate was high at the elevation from 30cm to 60cm, and the distribution shows a similarly tendency to the distribution of area be sloped less than 2 degrees.
