Analysis of bed change based on the geometric characteristics of channel cross-sections

Joo Suk Ko; Kyungsu Lee; Sunghyun Kwak; Siwan Lyu

doi:10.3741/JKWRA.2020.53.12.1097

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2020 Vol.53, Issue 12 Preview Page Next Page

Research Article

Analysis of bed change based on the geometric characteristics of channel cross-sections 유로 단면의 기하학적 특성을 이용한 하상변화량 분석

31 December 2020. pp. 1097-1107

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Abstract

A methodology has been proposed to understand the spatiotemporal changes of the river topography through the longitudinal change of the geometric characteristics of the cross-sections and the properties related thereto. Three-dimensional spatial information of the riverbed was obtained through the detailed bathymetry survey using an acoustic echo sounder for the reach from Gumi Weir to Chilgok Weir in the Nakdong river. Geometric informations for the reference sections were extracted using the acquired bathymetry survey data. By comparing the geometric properties for the reference sections, it was possible to catch the topographic characteristics and its changes over a reach of the channel. Through comparison with past survey data, it was also possible to quantitatively grasp the amount of change in cross-sectional area and volumetric change of riverbed. It is expected that a quantitative evaluation of river topography changes will be possible by applying the method proposed in this study.

Keywords

Nakdong river

Channel cross-section

Bathymetry survey

Geometric properties

Volumetric bed change

본 연구에서는 하도단면의 기하학적 특성과 그에 관한 특성값들의 종방향 변화를 통해 하천지형의 시·공간적 변화양상을 파악하기 위한 방법론을 제안하고자 한다. 이를 위해 낙동강 구미보 ~ 칠곡보 구간에 대한 음향측심기를 이용한 상세 수심측량을 통해 하상에 대한 3차원 공간정보를 취득하였다. 취득된 자료를 이용하여 기준단면에 대한 기하학적 정보를 추출하였다. 추출된 하천단면의 기하특성치들을 비교함으로써 특정 하도구간에서의 지형 특징을 파악할 수 있었다. 과거 측량성과와의 비교를 통해 단면변화량과 체적하상변동량을 정량적으로 파악할 수 있었다. 향후 본 연구에서 제안한 방법의 다양한 하천구간에서 대한 적용을 통해 하천지형변화에 대한 정량적 평가방법을 제시할 것으로 기대하는 바이다.

키워드

낙동강

유로단면

수심측량

기하특성치

체적하상변화량

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Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 53
No :12
Pages :1097-1107
Received Date : 2020-09-10
Revised Date : 2020-10-23
Accepted Date : 2020-10-23
DOI :https://doi.org/10.3741/JKWRA.2020.53.12.1097

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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