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한국지형학회> 한국지형학회지> 독도 서도 및 동도 남부 해안의 파식대 지형 발달

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독도 서도 및 동도 남부 해안의 파식대 지형 발달

Geomorphological Development of Shore Platforms at Dongdo and Seodo in the Southern Coast of Dok-do Island

황상일 ( Hwang Sangill ) , 권용휘 ( Kwon Yong-whuy ) , 윤순옥 ( Yoon Soon-ock )
  • : 한국지형학회
  • : 한국지형학회지 26권4호
  • : 연속간행물
  • : 2019년 12월
  • : 33-45(13pages)

DOI

10.16968/JKGA.26.4.33


목차

I. 문제제기 및 연구목적
II. 독도의 개관
III. 독도 서도 및 동도 남부 해안의 파식대분포와 규모
IV. 독도 남부 해안의 파식대 지형 발달
V. 요약 및 결론
사 사
References

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초록 보기


						
The shore platforms at Dok-do could be an important and clear indicator showing dimensional reduction of Dok-do. Especially flat type shore platforms are distributed in the southern coast of Dok-do island, composed of weak rocks against erosional resistance like interbedded lapilli tuff and massive tuff breccia. The distribution of shore platform is partially related to the wind direction at Dok-do island. The primary SW- and secondary SE winds are representative among wind directions at Dok-do, maintaining from spring to the autumn. Therefore, wide shore platforms could be developed by waves approaching from SW and SE directions in the southern coast of Dok-do. The sea stacks like Gunham-rock, Neopdeok-rock, Keungaje-rock and Jakeungaje-rock on the western coast are also considered to be formed by wave erosion from the SE direction. The shore platforms in the southern coast of Dok-do island were developed since ca. 7,000 yr. BP, when sea level raised almost to the present level. The average extension speed of shore platform was calculated to 4.0mm/y, because the broadest shore platform with the width ca. 28m was extended for ca. 7,000 years. The width’s dimension of shore platform at Dok-do reflects a slow extension rate in the present, although erosional process will be faster with the sea level rise in the future.

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  • : KCI등재
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  • : 1226-4296
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  • : 학술지
  • : 연속간행물
  • : 1994-2019
  • : 758


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1영산강 부유하중의 시계열적 입도 특성 변화: 승촌보, 죽산보를 중심으로

저자 : 임영신 ( Young Shin Lim ) , 김진관 ( Jin Kwan Kim )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 1-20 (20 pages)

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In order to establish appropriate policy to control sediment-associated problems, it is necessary to identify the physical characteristics of the reservoir sediments in particulate form in the Yeongsan River. Two time-integrated suspended sediment samplers were installed at Seungchon and Juksan weir on the upper and middle Yeongsan River in July 2012. Reservoir sediment samples were obtained at monthly intervals until October 2014. During the monitoring period, a total of 38 sediment samples were obtained and analyzed. Seasonal trends of suspended sedimentation rates and grain size distributions were examined based on variations in precipitation and discharge fluctuations. Moreover, stream flow characteristics, which has a great influence on the physical characteristics of the river sediment, was analyzed using flow duration curve for the period 2003-2019 at Naju gauging station.
Sedimentation rates during summer, when heavy rainfall was concentrated due to the monsoonal front and typhoon, were very high, indicating the positive relationship between sediment concentration and discharge. Particle size analysis of the collected sediment showed that coarse silt and very fine sand-sized sediment dominated most of the Seungchon weir sediment. On the other hand, medium silt-sized sediment dominated the downstream Juksan weir except for a few summer samples. These results implied that the physical characteristics of the suspended sediment are determined not only due to flow fluctuations, but also with regard to the antecedent rainfall conditions, hillslope-channel connectivity, and the supply of materials from various contributing regions. This information about flow characteristics and temporal variations in reservoir sediment can be used for safe management of the weir and discussing the issues on the dismantling of the weirs.

2몬테카를로 시뮬레이션을 이용한 하안단구 10Be 수직단면 연대측정

저자 : 김동은 ( Dong-eun Kim ) , 성영배 ( Yeong Bae Seong ) , 김종근 ( Jong-geun Kim )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 21-31 (11 pages)

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Timing of terrace formation is a key information for understanding the evolution of fluvial systems. In particular, dating strath terrace (i.e. timing of terrace abandonment) is more difficult than depositional terrace that is conventionally constrained by radiocarbon, OSL and other dating methods targeting samples within terrace deposit. Surface exposure dating utilizing cosmogenic 10Be provides more reliability because it can be applied directly to the surface of a fluvial terrace. Thus, this method has been increasingly used for alluvial deposits. As well as other geomorphic surfaces over the last decades. Some inherent conditions, however, such as post-depositional 10Be concentration (i.e. inheritance), surface erosion rate, and density change challenge the application of cosmogenic 10Be to depositional terrace surface against simple bedrock surface. Here we present the first application of 10Be depth profile dating to a thin-gravel covered strath terrace in Korea. Monte Carlo simulation (MCS) helped us in better constraining the timing of abandonment of the strath terrace, since which its surface stochastically denuded with time, causing unexpected change of 10Be production with depth. The age of the strath terrace estimated by MCS was 109 ka, ~4% older than the one (104 ka) calculated by simple depth profile dating, which yielded the best-fit surface erosion rate of 2.1 mm/ka. Our study demonstrates that the application of 10Be depth profile dating of strath terrace using MCS is more robust and reliable because it considers post-depositional change of initial conditions such as erosion rate.

3독도 서도 및 동도 남부 해안의 파식대 지형 발달

저자 : 황상일 ( Hwang Sangill ) , 권용휘 ( Kwon Yong-whuy ) , 윤순옥 ( Yoon Soon-ock )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 33-45 (13 pages)

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The shore platforms at Dok-do could be an important and clear indicator showing dimensional reduction of Dok-do. Especially flat type shore platforms are distributed in the southern coast of Dok-do island, composed of weak rocks against erosional resistance like interbedded lapilli tuff and massive tuff breccia. The distribution of shore platform is partially related to the wind direction at Dok-do island. The primary SW- and secondary SE winds are representative among wind directions at Dok-do, maintaining from spring to the autumn. Therefore, wide shore platforms could be developed by waves approaching from SW and SE directions in the southern coast of Dok-do. The sea stacks like Gunham-rock, Neopdeok-rock, Keungaje-rock and Jakeungaje-rock on the western coast are also considered to be formed by wave erosion from the SE direction. The shore platforms in the southern coast of Dok-do island were developed since ca. 7,000 yr. BP, when sea level raised almost to the present level. The average extension speed of shore platform was calculated to 4.0mm/y, because the broadest shore platform with the width ca. 28m was extended for ca. 7,000 years. The width's dimension of shore platform at Dok-do reflects a slow extension rate in the present, although erosional process will be faster with the sea level rise in the future.

4지형형태와 변화를 반영한 대조차 해빈 분류: 태안지역 해빈을 사례로(2017-2018)

저자 : 김찬웅 ( Kim Chan Woong )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 47-65 (19 pages)

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A case study was conducted in Taean region to seek a more detailed macrotidal beach classification than existing beach classification models (Masselink and Short, 1993). Seepage and ridge & runnel were used for classification. On 20 beaches, 68 transects were surveyed 5 times using VRS-GPS. Cross-section area from the transect profiles, mean grain size from sediment analysis, significant wave height from Swan-wave modeling and beach embaymentization from aerial photograph analysis were used to identify the characteristics of the individual types. The transects were classified into 5 types in Taean region; Type 1: low tidal terrace, Type 2: low tidal terrace & ridge, Type 3: dissipative, Type 4: seasonal ridge, and Type 5: ridge & runnel. Generally, seepage was related to coarse sediment size and ridge & runnel was related to high significant wave height. Each type has different characteristics and there was a tendency between the types. The low tidal terrace type had coarse sediments, because this type is excluded from the littoral cell. In this study, the ridge and runnel type could be applied to the classification because the study area is limited only to the macrotidal environment in Taean region.

5부산 다대포 지역 해안 단구 제1면의 구정선 고도와 형성 시기

저자 : 신재열 ( Shin Jae-ryul ) , 홍영민 ( Hong Yeong-min ) , 홍성찬 ( Hong Seong-chan )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 67-79 (13 pages)

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This study documents the level of paleo-shoreline and the timing of formation of the lowest marine terrace (1st terrace) distributed in Dadaepo, Busan, South Korea. In the study area, the elevation of paleo-shoreline of the 1st terrace is clearly identified as 5 meters above mean high tide based on the elevation of wave-cut platforms and the elevation of boundary between marine and terrestial sediments. This is well consistent with the fact that are found along the Southern coast of the Korean Peninsula including Daepodong, Sacheon-si. The timing of formation of the 1st terrace in Dadaepo is confirmed to have been deposited around 70,000~80,000 years BP (MIS 5a) according to OSL and IRSL dating ages. However, because the formation age of the 1st terrace in Sacheon-si Daepo-dong (Southerm coast) and Pohang-si Umok-ri (Eastern coast) previously identified as about 90,000~100,000 years BP (MIS 5c), further discussion of what is needed. Possibly, it can be interpreted that the sub-interglacial (MIS 5a and 5c) sea-level records during the last interglacial period are likely to be selective on land depending on regions.

6영덕 일대의 해성단구와 해면변동단구의 대비와 편년

저자 : 최성길 ( Choi Seong Gil ) , 장호 ( Chang Ho )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 81-96 (16 pages)

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The Yeongdeok 53m marine terrace (Y53mT), Y43mT, Y33mT, Y24mT, Y19mT and Y11mT distributed along the Yeongdeok coast, southeastern Korean Peninsula are well compared with the thalassostatic terraces of the high terrace 1 (ℓHT1 ; 51m of the relative heights from the river floor), high terrace 2 (ℓHT2 ; 43m), middle terrace 1 (ℓMT1 ; 32m), middle terrace 2 (ℓMT2 ; 25m), lower terrace 1 (ℓLT1 ; 18m) and lower terrace 2 (ℓLT2 ; 10m) respectively, developed along the lower reaches of the Chucksan-cheon and Obo-cheon rivers, judging from the comparison of paleosols (red soils) between the above marine and thalassostatic terraces. Using the Y19mT of the MIS 5e as the key surface, we propose that the terraces of the Y53mT and ℓHT1, Y43mT and ℓHT2, T33mT and ℓMT1, Y24mT and ℓMT2, Y19mT and ℓLT1, and Y11mT and ℓLT2 have been formed at the MIS 11, 9, 7e and 7a (or 7a), 5e and 5a respectively. The red soils have been developed at the Y19mT and ℓLT1 and above them, but not on the Y11mT and ℓLT2 surfaces.

7태안해안국립공원 해안지형과 지질 자원의 분포 현황과 특성

저자 : 서종철 ( Seo Jong Cheol )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 97-106 (10 pages)

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This study aims to investigate geomorphological and geological landscapes in the Taeanhaean National Park to ensure they are well-preserved. This study discovered 390 geomorphological and geological landform resources distributed in the coastal zone of Taeanhaean National Park. Representative geomorphological and geological landforms include : sea cliffs, sea caves, wave-cut platforms, sea-stacks, pebble beaches, sand beaches, tidal flats, coastal dunes, coastal dune wetlands and folds (or micro folds) landforms. Deposition landforms are developed more and erosion and weathering landforms are less on the land zone than island zone. These landform resources vary from district to district and can be developed for geo-tourism resources. Combined efforts from the Taeanhaean National Park authorities and residents are essential to manage ecological programs using geomorphological and geological resources

8지형 분석을 통한 활성 단층 추적 연구

저자 : 신재열 ( Shin Jae-ryul ) , 홍영민 ( Hong Yeong-min ) , 김형수 ( Kim Hyung-soo ) , 이광률 ( Lee Gwang-ryul )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 107-121 (15 pages)

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This study documents the distribution of (active) faults around the southern part of the Yangsan Fault and the Moryang Fault and the middle part of the Dongrae Fault. For this objective, we extracted lineaments and fault-related landforms by analyzing aerial photos and digital elevation models and with the result of fieldwork on fault-relating features of the Quaternary landforms. Geomorphological techniques for active fault study are not only preliminary but also essential methods because, in general, an active fault can be defined only with fault-deformed Quaternary sediments when there is no way to detect precise timing of faulting. Therefore, geomorphological interpretation in active fault research is necessary to determine the extent, direction, termination and timing of fault. This study addresses the results of such geomorphological analysis and geomorphic markers for tracing the active faults in the study area. It is plan to investigate with geophysical and geological techniques the sites referred in this study.

9한라산국립공원 어리목-영실탐방로의 해설표지판 분석

저자 : 고지희 ( Jihee Ko ) , 김태호 ( Taeho Kim )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 123-140 (18 pages)

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This study analyzed problems of interpretive signs along Eorimok-Yeongsil Trail on Mt. Hallasan National Park, focusing on factors of distracting visitor's attention from reading and understanding the signs. Eorimok-Yeongsil Trail has a total of 86 signs, and according to their purpose and content, they are classified into thirteen general signs, sixteen location signs, nine safety signs and forty-eight interpretive signs. Interpretive signs provide visitors with information and explanations about the nature and human resources of Mt. Hallasan as well as enhancing the opportunity for self-guided interpretation. The contents of interpretive signs of Eorimok-Yeongsil Trail are composed of landscapes, flora and fauna, topography, geology, history and culture, of which 70.8% of the total are related to plants and animals. Interpretive signs on the Eorimok-Yeongsil Trail do not attract visitors' attention because of the low readability, inappropriate locations and frequent errors in translation from Korean into other languages. The causes of low readability of interpretive signs include thirty-six physically damaged and faded signs, twenty-two improper font sizes and misuse of color schemes and five unclear description signs. The reasons for the incorrect locations include twenty-two long distances from the trails, twenty-one inadequate heights and fifteen inconsistencies in descriptions and locations. Problems with English use include eight grammar and spelling errors, twenty-one incorrect translations, and twenty-six English names missing.

10포항시 흥해읍 용한리지역에 분포하는 제4기 퇴적층의 OSL 연대

저자 : 정혜경 ( Hea Kyung Jung ) , 김정빈 ( Cheong Bin Kim )

발행기관 : 한국지형학회 간행물 : 한국지형학회지 26권 4호 발행 연도 : 2019 페이지 : pp. 141-145 (5 pages)

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This study investigated Quaternary sand deposits in the process of surveying Quaternary deposits distributed in Yonghan-ri, Heunghae-eup, Pohang city. Field geological surveys were conducted and OSL dating samples were taken. The altitude of the Quaternary sand deposits layer is about 15m, and there are two upper and lower sand dune layers, and a peat layer is developed between them. The sampling point are just above the peat layer, and the altitude level is about 13.4m (YHO-1) and about 13.7m (YHO-2). OSL dating was performed for YHO-1 and YHO-2 and the results were 69 ± 6 ka and 62 ± 5 ka, respectively. The date analyzed are interpreted as MIS 4. On the other hand, the formation time of the peat layer at an altitude of about 13.2 to 13.7m can be compared with the results of the OSL dating of the above sandy deposits. The peat layer can be inferred to have formed during MIS 5a or earlier.

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