• Title, Summary, Keyword: the Southern coast

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Correlation Analysis between Physical Properties and Compression Index for Dredged and Reclaimed Marine Clay in the Southern Coast of Korea (남해안 매립 해성점토의 물리적 특성과 압축지수의 상관성 분석)

  • Lim, Seok-Hun;Yoo, Nam-Jae
    • Journal of Industrial Technology
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    • v.34
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    • pp.53-59
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    • 2014
  • The single regression method was used to analyze the correlationship between the compression index with mechanical properties for reclaimed marine clays in the southern coast of Korea. As results of performing regression analysis for 200 samples about reclaimed marine clays in the southern coast of Korea, linear regression lines between compression index and natural water content, void ratio in situ, and liquid limit respectively wer obtained. The changed properties of soil due to disturbance during dredging and reclaiming could be investigated by comparing with the existing empirical correlation equations for the original ground where dredging was performed. These regression equations might be rationally used in the preliminary evaluation of settlement of dredged and reclaimed marine clayey ground in the southern coast of Korea.

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Formative Age of Coastal Terraces and Uplift Rate in the East Coast of South Korea (우리나라 동해안의 해안단구 형성시기와 융기율)

  • Park, Chung-Sun;Kihm, You Hong;Nahm, Wook-Hyun;Lee, Gwang-Ryul
    • Journal of The Geomorphological Association of Korea
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    • v.24 no.4
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    • pp.43-55
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    • 2017
  • This study tries to examine papers on coastal terrace in the East Coast of South Korea and to summarize formative age and elevation of the terrace. Spatial and temporal variations of uplift rate in the Coast based on absolute age published are also reviewed. The terrace in the middle part in the Coast from Goseong to Samcheok distributes in an elevation of 10-20 m and its formative age is MIS 5a. The terraces during MIS 5e and 7 develop on an elevation of 20-35 m and 60-80 m, respectively. The mid-southern part in the Coast from Uljin to Yeongil Bay has the terraces with elevations of 10-25 m and 25-45 m and their ages are MIS 5a or 5c and 5e, respectively. The terraces with elevations of 10-25 m and 30-45 m correspond to MIS 5a and 5e, respectively, in the southern part in the Coast from Homigot to Busan. Assuming that elevation of sea level during the formation of each terrace is the same as in the present time, uplift rates in the Coast range from 0.05 to 1.36 m/ky with an average of approximately 0.33 m/ky. The highest and lowest rates since MIS 5 are found in the Gyeongju (approximately 0.39 m/ky) and Pohang (approximately 0.19 m/ky) areas. With a consideration of elevation of sea level at that time, however, the middle, midsouthern and southern parts in the Coast show uplift rates of 0.16-0.28 m/ky, 0.20-0.36 m/ky and 0.24- 0.36 m/ky since MIS 5, respectively, suggesting that the southern part in the Coast has experienced relatively higher uplift rate.

The Formative Processes and Ages of Paleo-coastal Sediments in Daepo-dong Sacheon-si in the Southern Coast, South Korea: Evaluation of the Mode and Rate of the Late Quaternary Tectonism (II) (남해안 사천시 대포동 일대에 분포하는 고해안 퇴적물의 형성 과정과 형성 시기: 한반도 제4기 후기 지각운동의 양식과 변형률 산출을 위한 연구(II))

  • Shin, Jaeryul;Hong, Seongchan
    • Journal of The Geomorphological Association of Korea
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    • v.25 no.3
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    • pp.57-70
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    • 2018
  • This study restores onshore paleo-shoreline records and establishes the nature and strain rate of neotectonism by investigating the existence and formative age of paleo-coastal sediments emerged around Sacheon-si in the Southern part of the Korean peninsula. As a result, paleo-sand bars representing 5m of the paleo-shoreline from high tide level are formed in Sacheon-si, and the formation age of these is confirmed as MIS 5c at approximately 100,000 year BP through rock surface luminescence dating to rounded gravels in paleo-sand bars. Although it is difficult to establish the uplift rate of crust precisely due to incomplete restoration of sea level records during the last interglacial stage, the uplift rate along the Southern coast of the peninsula was assumed approximately 0.72 lower than the Eastern coast during the late Quaternary in comparison to the 1st marine terrace along the Eastern coast.

Detection Characteristics of Perfluorinated Compounds (PFCs) in the Southern Coastal Sediment of South Korea and Annual Concentration in Sea Water (남해안 연안 해역 퇴적물에서 과불화화합물(PFCs)의 검출 특성 및 해수에서의 연도별 농도)

  • Paik, Byeong Cheon;Kam, Sang-Kyu
    • Journal of the Korean Society of Urban Environment
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    • v.17 no.3
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    • pp.231-241
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    • 2017
  • The objective of this study is to investigate the detection characteristics of 10 perfluorinated compounds (PFCs) in the coastal sediment and annual concentration of PFCs in sea water of Southern Coast, South Korea, which is part of an ongoing program of monitoring on the local distribution of PFCs. All samples were analyzed by liquid chromatography tandem mass spectrometr y (LC/ESI-MS/MS). 6 PFCs were detected in the coastal sediment of Southern Coast, which are perfluorooctanonic acid (PFOA), perfluorooctane sulfonate (PFOS), perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnDA), and perfluorododecanoic acid (PFDoDA). Total PFCs were detected at all sampling sites of the coastal sediment, and average concentration of total PFCs were in the range of 0.085 to 0.705 ng/g.dw (dry weight). PFCs with high detective frequency and high concentration in the coastal sediment of Southern Coast were PFOA and FFOS, and average concentration of PFOA and PFOS in 2015 year were in the range of 0.065 to 0.175 ng/g.dw and N.D. to 0.34 ng/g.dw, respectively. However, 4 PFCs were detected in the sea water of Southern Coast, which are PFOA, PFNA, PFHxS (perfluorohexane sulfonate), PFOS. PFCs with high detective frequency and high concentration in sea water of Southern Coast were also PFOA and FFOS, and annual average concentration of PFOA and PFOS during three years were in the range of 7.27 to 25.52 ng/L and N.D. to 33.51 ng/L, respectively. These results suggest that continuous monitoring by year of PFOA and PFOS is needed in the coastal sediment and sea water of Southern Coast, South Korea.

Characteristics of Meteorological Disasters in the Southern Coast of Korea (우리나라 남해안의 기상재해 특성)

  • Seol, Dong-Il
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.34-35
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    • 2010
  • The meteorological disasters in the southern coast of Korea were analyzed for 20years from 1989 to 2008 using the Korea meteorological administration's data. The results are summarized as follows. Yearly mean number and the total number of meteorological disasters in the southern coast of Korea during 20 years are 7.5 and 149, respectively. The highest number appears in July followed by August and the third is September. The meteorological disasters from July to September occupied about 42%. The seasonal mean number is most in summer(about 39% of all), the next orders are the autumn, winter and spring. The meteorological disasters in summer are mainly caused by typhoon and changma. The meteorological disasters of a great scale occurred by typhoons(for example, 9112 GLADYS, 0215 RUSA and 0314 MAEMI) which strike in the southern coast of Korea.

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An Analysis of Characteristics on Meteorological Disasters in the Southern Coast of Korea (우리나라 남해안의 기상재해 특성 분석)

  • Seol, Dong-Il
    • Journal of Navigation and Port Research
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    • v.35 no.1
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    • pp.17-21
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    • 2011
  • Characteristics of meteorological disasters in the southern coast of Korea were analyzed for 20 years from 1989 to 2008 using the Korea meteorological administration's data. The main results are summarized as follows. Yearly mean number and the total number of meteorological disasters in the southern coast of Korea during 20 years are 7.5 and 149, respectively. The highest number appears in July followed by August and the third is September. The meteorological disasters from July to September occupied about 42%. The seasonal mean number is most in summer(about 39% of all), the next orders are the autumn, winter and spring. The meteorological disasters in summer are mainly caused by typhoon and heavy rain. The meteorological disasters of a great scale occurred by typhoons(for example, 9112 GLADYS, 0215 RUSA and 0314 MAEMI) which strike in the southern coast of Korea.

New Records of Marine Algae from Korea II

  • Oak, Jung-Hyun;Keum, Yeon-Shim;Hwang, Mi-Sook;Oh, Yoon-Sik
    • ALGAE
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    • v.20 no.3
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    • pp.177-181
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    • 2005
  • Two species of marine algae, Fauchea spinulosa Okamura et Segawa (Rhodymeniaceae, Rhodophyceae) and Stictyosiphon soriferus (Reinke) Rosenvinge (Chodariaceae, Phaeophyceae) were newly collected from the southern coast and Cheju Island of Korea. Fauchea spinulosa was collected from subtidal zone in the insular region of the southern coast. Plants were erect from the discoidal holdfast with short stipe, pinkish to deep red, cartilageneous, dichotomously and flabellately branched, and 10-15 cm high, 5-15 mm broad. Tetrasporangia are cruciately divided and nemathecia occurred on a side of the branches. Cystocarps were mostly coronate in marginal area and spermatangia were scattered on both sides of branches. Stictyosiphon soriferus commonly occurs on muddy and sandy intertidal flat of Namhaedo located on the southern coast. Plants are epilithic, light brown, terete, 3-5 cm high, and branched heavily in irregular or alternate manner, arising from a small holdfast with rhizoidal clumps. Plurilocular sporangia were scattered in patches and slightly swollen above the cortex of the whole filament. Unilocular sporangia were not found.

New Records of Marine Algae from KoreaⅠ

  • Oak, Jung-Hyun ;Keum, Yeon-Shim;Hwang, Mi-Sook;Oh, Yoon-Sik
    • ALGAE
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    • v.17 no.3
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    • pp.145-151
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    • 2002
  • Three species of marine algae, two browns and one red were newly reported from the eastern and the southern coast of Korea including Cheju Island. their vegetative and reproductive structures were described. Colpomenia phaeodactyla Wynne et J.N. Norris (Scytosiphonaceae, Phaeophyceae) commonly occured in middle to lower intertidal zone of southern coast. Plants consisted of clusters of elongated and hollow sacs arising from an adherent colpomenioid base. Plurilocular sporangia were multiseriate, forming dense, extensive sori over the erect sacs. Cutleria adspersa (Mertens ex Roth) De Notaris (Cutleriaceae, Phaeophyceae) was collected from subtidal region of Cheju Island. It was characterized by broadly fan-shaped habits with golden brown colour and hair-fringed margines, attached by rhizoids along undersurface. Halarachnion latissimum Okamura (Furcellariaceae, Rhodophyceae) was found adrift from several areas of southern coast. Plants were brownish red, filmy and dlicate, membranaceous roundish fronds. Cystocarps were globular and formed under the cortical layer. Tetrasporangia were oblong and zonately divided.

Effect of Typhoons on Contaminants Released from the Southern Sea around Fukushima of Japan (일본 후쿠시마 근해에서 방출된 오염물질에 미치는 태풍의 영향)

  • Hong, Chul-Hoon;Kim, Jinpyo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.49 no.2
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    • pp.234-240
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    • 2016
  • We examined the diffusion of contaminants released from the southern coast around Fukushima, Japan, during the passage of typhoons using a three-dimensional numerical model (POM) to track diffusing radioactivity (RA) released from the nuclear power plant at Fukushima following the accident caused by the giant tsunami event in March 2011. Radioactive contaminants released during the passage of typhoons may have significantly affected not only Japanese but also Korean coastal waters. The model domain covered most of the northwestern Pacific including marginal seas such as the East/Japan Sea and the Yellow Sea. Several numerical experiments were conducted case studies focusing on the westward diffusion from the southern coast of Japan of contaminants derived from the source site (Fukushima) according to various attributes of the typhoons, such as intensity, track, etc. The model produced the following results 1) significant amounts of contaminants were transported in a westward direction by easterly winds favorable for generating a coastal air stream along the southern Japanese coast, 2) the contaminants reached as far as Osaka Bay with the passage of typhoons, forced by a 5-day positive sinusoidal form with a (right-) northward track east of Fukushima, and 3) the range of contamination was significant, extending to the interior of the East/Japan Sea around the Tsugaru Strait. The model suggests that contaminants and/or radioactivity released from Fukushima with the passage of typhoons can affect Korean waters including the northeastern East/Japan Sea around the Tsugaru Strait, especially when the typhoon tracks are favorable for generating a westward coastal air stream along the southern Japanese coast.

A unique genetic lineage at the southern coast of China in the agar-producing Gracilaria vermiculophylla (Gracilariales, Florideophyceae)

  • Hu, Zi-Min;Liu, Ruo-Yu;Zhang, Jie;Duan, De-Lin;Wang, Gao-Ge;Li, Wen-Hong
    • ALGAE
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    • v.33 no.3
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    • pp.269-278
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    • 2018
  • Ocean warming can have significant negative impacts on population genetic diversity, local endemism and geographical distribution of a wide range of marine organisms. Thus, the identification of conservation units with high risk of extinction becomes an imperative task to assess, monitor, and manage marine biodiversity for policy-makers. Here, we surveyed population structure and genetic variation of the red seaweed Gracilaria vermiculophylla along the coast of China using genome-based amplified fragment length polymorphism (AFLP) scanning. Regardless of analysis methods used, AFLP consistently revealed a south to north genetic isolation. Populations at the southern coast of China showed unique genetic variation and much greater allelic richness, heterozygosity, and average genetic diversity than the northern. In particular, we identified a geographical barrier that may hinder genetic exchange between the two lineages. Consequently, the characterized genetic lineage at the southern coast of China likely resulted from the interplay of post-glacial persistence of ancestral diversity, geographical isolation and local adaptation. In particular, the southern populations are indispensable components to explore evolutionary genetics and historical biogeography of G. vermiculophylla in the northwestern Pacific, and the unique diversity also has important conservation value in terms of projected climate warming.