Author(s): Joo Suk Ko; Jae Gon Park; Sunghyun Kwak; Kyungsu Lee; Siwan Lyu

Linked Author(s): Joo Suk Ko, Sunghyun Kwak, Siwan Lyu

Keywords: Cross Section; Bathymetry; Geometrical

Abstract: In order to understand the spatial and temporal changes in bathymetry of large rivers whose water level and discharge are artificially controlled, a study was conducted on the middle reach of the Nakdong River, a representative river in South Korea. The purpose of this study is to evaluate the applicability of the technique for analyzing the state of topographical change through the geometrical properties ​​of the river cross section and the volumetric change of river bed. For the reach from Gangjeong-Goryeong Weir to Dalseong Weir, the bathymetry was measured using an echo sounder and 3D spatial information was constructed using GIS tool. The longitudinal change of the geometrical properties ​​of the channel cross sections was analyzed, and the spatial characteristics of the river topography were analyzed. In order to understand the temporal characteristics of the river topography, the analysis results of the data measured in this study were compared with the data analysis results before 2009, when the physical characteristics of the study area changed significantly. Through the analysis and comparison of the results, the spatiotemporal characteristics of the topography of the river reach where the water level and discharge are controlled were understood and the applicability of the analysis technique was confirmed.

DOI: https://doi.org/10.3850/IAHR-39WC2521711920221362

Year: 2022