Survey of Sedimentary Environment and Sediment at the West-Northern Site of Chagwi-do nearby Jeju Island

2016 ◽  
Vol 19 (2) ◽  
pp. 137-143 ◽  
Author(s):  
Hansoo Kim ◽  
Jong-Wu Hyeon ◽  
Changzhu Jin ◽  
Jeongrok Kim ◽  
Il-Hyoung Cho
Keyword(s):  
Sedimentary Environment ◽  
Jeju Island ◽  
The West ◽  
Northern Site

Seasonal Dynamics of Phytoplankton and Environmental Factors around the Chagwi-do off the West Coast of Jeju Island, Korea

2007 ◽  
Vol 42 (2) ◽  
pp. 117-127 ◽  
Author(s):  
Abu Affan ◽  
Joon-Baek Lee ◽  
Jun -Teck Kim ◽  
Young -Chan Choi ◽  
Jong -Man Kim ◽  
...  
Keyword(s):  
Environmental Factors ◽  
West Coast ◽  
Seasonal Dynamics ◽  
Jeju Island ◽  
The West

scholarly journals Fingerprinting sediments along the west coast of Jylland: interpreting provenance data

1969 ◽  
Vol 17 ◽  
pp. 25-28
Author(s):  
Christian Knudsen ◽  
Thomas Kokfelt ◽  
Troels Aagaard ◽  
Jesper Bartholdy ◽  
Morten Pejrup
Keyword(s):  
West Coast ◽  
Sedimentary Environment ◽  
Economic Value ◽  
Heavy Minerals ◽  
Provenance Analysis ◽  
Sample Collection ◽  
The West ◽  
Protection Measures ◽  
Transport Pathways ◽  
Provenance Data

The Danish North Sea coast is a dynamic sedimentary environment experiencing erosion, transport and re-deposition of sand along the coast. Because of the natural and economic value of the coastal zone expensive protection measures such as nourishment of the coast are undertaken. The present study utilises provenance analysis techniques developed at the Geological Survey of Denmark and Greenland (GEUS) to characterise the coastal sand bodies by fingerprinting the heavy minerals in the sand. The aims of the study are to test these new methods in an active sedimentary environment and to develop an understanding of transport pathways along the coast. A total of c. 40 samples have been collected and analysed as part of the project. This paper gives an outline of the project and provides examples of the methods used based on six samples from the Husby profile on the west coast of Jylland (Fig. 1). The study is a collaboration project involving GEUS and the Department of Geography and Geology (DGG) at Copenhagen University; GEUS is responsible for the analyses and DGG for sample collection.

scholarly journals Evolution of the West African Mangrove During the Late Quaternary: A Review

2007 ◽  
Vol 51 (3) ◽  
pp. 405-414 ◽  
Author(s):  
Anne-Marie Lézine
Keyword(s):  
West Africa ◽  
Late Quaternary ◽  
Sedimentary Environment ◽  
Late Glacial ◽  
West African ◽  
Pollen Deposition ◽  
Monsoon Circulation ◽  
The West ◽  
Local Conditions ◽  
Peat Deposits

ABSTRACT The review of pollen data on mangrove pollen deposition in modern and late Quaternary sediments of West Africa points to two distinct signals linked to the sedimentary environment concerned. Along the littoral and on the slope of the continental shelf, mangrove peat deposits recording more than 40% of Rhizophora percentages reflect the postglacial sea-level rise and give evidence for the associated paleogeographical modifications (e.g. during the Nouakchottian transgression). Deep oceanic records show that the mangrove was present along the West African coasts during the Late Glacial Maximum reflecting local conditions of fresh water input and sea surface temperatures not as low as previously suggested. Mangrove developed after 12 500 BP as far north as 21°N; its maximum extension was recorded ca. 9500 BP reflecting the enhanced monsoon circulation over West Africa.

Holocene environmental change inferred from multiple proxies in the mouth of Gomso Bay on the west coast of South Korea

2017 ◽  
Vol 88 (2) ◽  
pp. 193-205 ◽  
Author(s):  
Bing Song ◽  
Sangheon Yi ◽  
Tae-Soo Chang ◽  
Jin-Cheul Kim ◽  
Limi Mao ◽  
...  
Keyword(s):  
South Korea ◽  
Sea Level ◽  
West Coast ◽  
Sedimentary Environment ◽  
River Mouth ◽  
Sediment Supply ◽  
Tidal Channel ◽  
The West ◽  
Depositional Process ◽  
Gomso Bay

AbstractA sediment core (14DH-C01) obtained from the mouth of Gomso Bay, on the west coast of South Korea, was used to obtain high-resolution palynomorph, grain-size, and14C age data to investigate the Holocene sedimentary environment. The results indicated a transgressive depositional process with four stages controlled by sea-level change, as follows: river-dominated fluvial deposition from the early Holocene to 8.48 cal ka BP; tide-dominated tidal channel fill transgression from 8.48 to 8.08 cal ka BP; tide- to wave-dominated tidal channel fill transgression from 8.08 to 6.98 cal ka BP; and wave-dominated marine transgression from 6.98 cal ka BP to the present. Tidal channel filling was the primary mid-Holocene depositional process, accounting for the high sedimentation rate observed. The different hydrodynamics of the river-dominated, tide-dominated, tide- to wave-dominated, and wave-dominated processes following the changes in sea level may have controlled the transgressive depositional process. This transgressive sedimentary model differs from those of other large river mouth areas (e.g., the Changjiang River) since the mid-Holocene, perhaps resulting from the limited sediment supply in the study area.

scholarly journals A Numerical Study of Clear-Air Turbulence (CAT) Encounters over South Korea on 2 April 2007

2010 ◽  
Vol 49 (12) ◽  
pp. 2381-2403 ◽  
Author(s):  
Jung-Hoon Kim ◽  
Hye-Yeong Chun
Keyword(s):  
South Korea ◽  
West Coast ◽  
Korean Peninsula ◽  
Numerical Study ◽  
Vertical Wind Shear ◽  
Jeju Island ◽  
Convective System ◽  
The West ◽  
Air Turbulence ◽  
Upper Level

Abstract On 2 April 2007, nine cases of moderate-or-greater-level clear-air turbulence (CAT) were observed from pilot reports over South Korea during the 6.5 h from 0200 to 0830 UTC. Those CAT events occurred in three different regions of South Korea: the west coast, Jeju Island, and the eastern mountain areas. The characteristics and possible mechanisms of the CAT events in the different regions are investigated using the Weather Research and Forecasting model. The simulation consists of six nested domains focused on the Korean Peninsula, with the finest horizontal grid spacing of 0.37 km. The simulated wind and temperature fields in a 30-km coarse domain are in good agreement with those of the Regional Data Assimilation and Prediction System (RDAPS) analysis data of the Korean Meteorological Administration and observed soundings of operational radiosondes over South Korea. In synoptic features, an upper-level front associated with strong meridional temperature gradients is intensified, and the jet stream passing through the central part of the Korean Peninsula exceeds 70 m s−1. Location and timing of the observed CAT events are reproduced in the finest domains of the simulated results in three different regions. Generation mechanisms of the CAT events revealed in the model results are somewhat different in the three regions. In the west coast area, the tropopause is deeply folded down to about z = 4 km because of the strengthening of an upper-level front, and the maximized vertical wind shear below the jet core produces localized turbulence. In the Jeju Island area, localized mixing and turbulence are generated on the anticyclonic shear side of the enhanced jet, where inertial instability and ageostrophic flow are intensified in the lee side of the convective system. In the eastern mountain area, large-amplitude gravity waves induced by complex terrain propagate vertically and subsequently break down over the lee side of topography, causing localized turbulence. For most of the CAT processes considered, except for the mountain-wave breaking, standard NWP resolutions of tens of kilometers are adequate to capture the CAT events.

scholarly journals Biostratigraphy and microfacies of the pelagic carbonate formations in the Yavorets section (Tithonian–Berriasian), Western Balkan Mts, Bulgaria

2019 ◽  
Vol 48 (2) ◽  
pp. 51-73
Author(s):  
Silviya Petrova ◽  
Elena Koleva-Rekalova ◽  
Daria Ivanova ◽  
Iskra Lakova
Keyword(s):  
Carbonate Platform ◽  
Sedimentary Environment ◽  
The West ◽  
Regional Correlation ◽  
Vertical Distributions ◽  
Lower Berriasian ◽  
Carbonate Formations ◽  
Shallow Carbonate Platform ◽  
Channel Deposits ◽  
New Evidence

Calpionellid study has provided new evidence of early and late Tithonian age of the top of the Gintsi Formation, and of late Tithonian and early Berriasian age of the Glozhene Formation in the Yavorets section (Western Balkan Mts, Bulgaria). The calpionellid Chitinoidella, Praetintinnopsella, Crassicollaria, and Calpionella zones have been documented in successive order. Three calcareous dinocyst zones – Colomisphaera tenuis, Colomisphaera fortis and Stomiosphaerina proxima, have been determined in this lower Tithonian to lower Berriasian interval. From the base upwards, the following microfacies have been recognized: Saccocoma (Gintsi Formation, lower and upper Tithonian), Globochaete alpina, and calpionellid (Glozhene Formation, upper Tithonian and lower Berriasian). The base of the Berriasian has been traced at the explosion of the uniformly shaped spherical variety of Calpionella alpina. Evolutionary lineages of species of the genus Calpionella are discussed, as well as the vertical distributions and abundance peaks of crassicollarians. The calpionellid zones described herein are correlated with coeval zonations from the Western, Central and Eastern Tethyan domains. The regional correlation with previously studied sections of Tithonian/Berriasian pelagic carbonates in the Western Balkan Mts revealed a transition to hemipelagic deposition of the limestone-marl succession of the Salash Formation and/or sandstone accumulation during the middle to late Berriasian (Elliptica and Simplex calpionellid subzones) due to unstable conditions of the sedimentary environment. From the west to the east in the Western Balkan Unit (i.e., from the Rosomač section in eastern Serbia to the Sarbenitsa, Bov and Yavorets sections in the Iskar River Valley area), there is a trend of slight progressive deepening of the basin. This is manifested in the occurrence of redeposited shallow-carbonate-platform microfossils in the west to greater thickenesses of the Gintsi and Glozhene formations and occurrence of sandstone channel deposits in the east.

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