Changed estuarine sedimentation characteristics after the construction of barrage in the East Asian monsoon climate region

Title
Changed estuarine sedimentation characteristics after the construction of barrage in the East Asian monsoon climate region
Author(s)
Jeong, Joo Bong; Jung, Hoi Soo; Lee, Jun Ho; Park, Kyoungkyu; Woo, Han Jun
KIOST Author(s)
Jung, Hoi Soo(정회수)Lee, Jun-Ho(이준호)Woo, Han Jun(우한준)
Alternative Author(s)
정주봉; 정회수; 이준호; 박경규; 우한준
Publication Year
2022-09-06
Abstract
The construction of Barrage had a significant impact on the world delta topography. Two barrages (in 1938 and 1983) were built for economic development at the estuary of the Nakdong River located on the Korean Peninsula, which caused continuous topographical changes for about 70 years. In the estuary, where deltas developed in the past, a barrier island of about 10 km was formed due to the change of flow path and changes in hydraulic energy after the construction of Barrage. In this study, the topographical characteristics and sedimentation system of the continuously growing barrier Island were revealed. Accordingly, photogrammetry, sedimentation rate, mean grain size, and sediment transport were analyzed.
The sedimentary system has three characteristics. On the east side, the sedimentation rate is high due to the sediment transport by the river during the wet season, and the sediments are coarse. due to strong hydrodynamic energy, it shows topographical characteristics with high elevation and slope. The central area is eroded by sediments supplied from the river, which are deposited during the flood season and move westward during the dry season. It is the region where the seasonal characteristics of erosion and deposition are most developed, and the influence of river and ocean energy is balanced. The west side is an area where marine energy is dominant, and although the deposition rate is the lowest, continuous deposition proceeds. Sediment is the sediment supplied from the central intertidal zone and undergoes re-activation and deposition processes. Due to this weak energy environment, the topographical slope is gentle and fine-grained sediments are continuously deposited. Our study revealed a barrier island sedimentation system that forms different sedimentation environments at the boundary between rivers and oceans, which is expected to provide important insights for managing estuaries in the future.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43349
Bibliographic Citation
ECSA 59, Using the best scientific knowledge for the sustainable management of estuaries and coastal seas, 2022
Publisher
Estuarine & Coastal Sciences Association (ECSA)
Type
Conference
Language
English
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