STUDY ON METHOD TO DRAW CROSS SECTIONAL PROFILES OF RIVERS USING LASER SCANNED GROUND HEIGHT DATA

Abstract

Although a data of river form for middle and small size river were not be prepared, we need to calculate inundation flow or water profile of river the data. Lately, LiDAR which can measure the ground height in the high density and accurately is often used, we suggested that a data of river form can generate from LiDAR data. In this paper, taking character of LiDAR data, the sectional profiles of 10 m interval from LiDAR data are generated, and past floods are calculated using generated sectional profiles. And otherwise, automatic extraction method of boundary between main channel and flood plain for calculation of nonuniform flow considering arborous efficacy as transverse velocity distribution is suggested.