Changes in topography and surface sediments by the Saemangeum dyke in an estuarine complex, west coast of Korea SCIE SCOPUS

Cited 30 time in WEB OF SCIENCE Cited 32 time in Scopus
Title
Changes in topography and surface sediments by the Saemangeum dyke in an estuarine complex, west coast of Korea
Author(s)
Lee, Hee J.; Ryu, Sang O.
KIOST Author(s)
Lee, Hee Jun(이희준)
Publication Year
2008-05-30
Abstract
The effects of a giant offshore dyke, Saemangeum, have been of special interest on both scientific and environmental aspects. Without any rival worldwide with regard to the ample scale and estuarine setting, the Saemangeum dyke and its vicinity (Saemangeum Area) should be an unprecedented experimental site for monitoring the consequence of the estuarine developments with dykes. In order to unravel geologic changes caused by the Saemangeum dyke, we collected a number of surface sediment samples and bathymetric profiles from a full coverage of the Saemangeum Area, and compared topography and sediment phase on the inter-annual (2002-2006, post-construction) and decadal (1982-2002, between pre- and post-construction) timescales. The dyke construction induced vigorous erosion along the dyke, especially across a few open gaps between dyke segments. These open gaps led to forming deep erosional troughs and the associated channels to the river mouth. At the same time, mild accumulation of sediments occurred on the broad seafloor offshore the erosional zone of dyke sector IV and on shoals between the erosional troughs off dyke sectors I-II. Inside the dyke, tidal flats have become expanded and aggraded with continuously discharged riverine sediments. Sands have been newly introduced into the offshore area of sector IV owing to tidal currents with an orientation forced to be parallel to sector IV (NE-SW), reinforced by high waves during winter. By contrast, the expanded sandy area off sectors I-II resulted from redistribution of pre-existing sands without any new input from offshore. As a whole, the concentrated erosion and sandy-seafloor expansion offshore represent the man-made influences triggered by the Saemangeum dyke. (C) 2008 Elsevier Ltd. All rights reserved.
ISSN
0278-4343
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4499
DOI
10.1016/j.csr.2008.03.008
Bibliographic Citation
CONTINENTAL SHELF RESEARCH, v.28, no.9, pp.1177 - 1189, 2008
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
YELLOW-SEA; SEAWALL CONSTRUCTION; TRANSPORT; TRANSGRESSION; CHANGJIANG; OFFSHORE; CURRENTS; CHINA; BEACH; ZONE
Keywords
estuarine sedimentation; topographic maps; sediment distribution; sediment transport; Saemangeum dyke; Yellow Sea
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Marine Geology,Sediment Dynamics,해양지질,퇴적역학

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