climate-2018-posters-accepted-abstracts

Page 74

Journal of Earth Science & Climatic Change | ISSN: 2157-7617 | Climate 2018 | Volume: 9

World Conference on

May 23-24, 2018 | New York, USA

Climate Change and Global Warming

Variations between deposition and erosion environments recorded in the shell sediments during the past

1300 years in the South coast of the Korean Peninsula

Dong-Yoon Yang, Jin Cheul Kim, Ju-Yong Kim

and

Min Han

Korea Institute of Geoscience and Mineral Resources, Korea

e found five shell and gravel layers formed by storming events in the western-most Dori island of the south coast of the

Korean Peninsula, in which the variations of the dominant deposition, the neutral and the dominant erosion environments

were recorded during the past 1300 years. The event layers were formed at 2.2-2.9m above mean sea level in the north side of the

island facing the Yeongjeon beach. The island is connected with the coast by tombolo of which the geomorphology and the height

are currently very changeable at every storming event. The tombolo and the event layers are thought to be similar to their forming

mechanism, because they are almost connected to each other, even though they were formed at different elevation. Regarding the

different elevation, it can be inferred that the event layers were formed by the stronger storming energy than the one forming tombolo.

Each storm delivered the sediments having the different ratios of two kinds of shell groups to the site. Seventeen species of shells were

identified from the five layers, based on Korea Marine Invertebrates Encyclopedia, and they were divided into two groups living in

sand and/or mud (group 1), on the rock and/or gravel (group 2). The weight ratios of group 1/group 2 of each layer are 0.6297 (layer

1; 720 yr AD), 0.901 (layer 2; 880 yr AD), 0.4246 (layer 3; 950 yr AD), 0.6012 (layer 3; 995 yr AD) and 0.1097 (layer 5; 1535 yr AD),

respectively. The high ratios of the layers mean dominant deposition environment, and vice versa. The results provide that sediments

of layers 1-4 formed in medium to dominant deposition environment of the warm period (MWP), but the sediment of layer five

formed in dominant erosion environment of cold period (LIA).

J Earth Sci Clim Change 2018, Volulme: 9

DOI: 10.4172/2157-7617-C1-040