• The Korean Journal of Quaternary Research
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• v.34 no.1
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• pp.15-30
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• 2024

Typhoon effects on macrotide open-coast intertidal sediments were investigated in the Gochang Gwangseungri sandy intertidal flat on the Korean western coast. Variations in the surface sediment texture, accumulation, and sedimentary facies were observed before and after the Typhoon Kompasu in 2010. The typhoon Kompasu landed on the southwestern coast of the Korean Peninsula and passed inland between September 1st and 2nd, 2010, respectively. Surface sediments and their accumulation before and after the typhoon were sampled and measured at intervals of 30 m along a survey line on the Gwangseungri intertidal flat. The intertidal areas were divided into high, middle, and lower tidal zones based on the mean high-wate level, mean sea level, and mean low-water level, respectively. The surface sediments of each tidal zone show rare variations in grain size and sorting of sediment texture before and after the typhoon Kompasu, whereas negative skewness values increased in the middle and lower tidal zones after the typhoon rather than before the typhoon. Surface accumulation represents deposition in the upper and middle tidal zone and erosion in the lower tidal zones after the typhoon. The accumulation decreased from the high to the lower tidal zones.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.304-309
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• 2008

기존의 태풍예측과 관련된 연구들은 전 지구적인 흐름이 직접적으로 계산되지 않은 중규모 기상모형이나 태풍모형들을 이용하여왔다. 하지만 최근 전 세계적으로 전구 규모의 모형들이 40km 이하의 고해상도 모형들이 개발되어 20km이하의 초고해상도 시물레이션이 가능해짐에 따라 지역적인 기상현상들을 전구모형을 통해서 재현해 내고 있다. 따라서 본 연구에서는 고해상도 전구모형을 이용하여 태풍 실험을 하고자 하며, 독일기상청에서 개발된 Icosahedral-hexagonal 격자체계의 GME전구 모형을 이용한 태풍모의 결과를 기상청 태풍 best track과 비교 분석 하였다. 실험에 사용된 모형 분해능은 연직 47layer (7 soil layer 포함), 수평 약 40km와 20km으로 구성되었다. 최근 3년($2005{\sim}2007$)간의 동아시아지역을 지나간 태풍을 대상으로 하였다. 태풍모의 시작시간은 각 TD(Tropical Depression)발생 24시간 전 자료를 이용하였으며, 각 태풍의 소멸 24시간 후까지 모의하였다. GME 모형을 이용한 태풍모의 결과에서 best track의 경우 모의 시작 후 약 168시간 forcast 결과가 매우 유사한 경로를 따라 진행해 가고 있으며, 태풍의 전향이 이루어지는 시각은 ${\pm}3$시간 내외의 오차를 보이고 있다. 태풍경로의 경우 40km 결과에 비해 20km 모의 결과가 best track에 더 가까운 결과를 보이고 있다. 중심기압변화의 경우 40km의 결과가 20km 결과에 비해 변화경향이 유사한 형태를 보이고 있으며, 20km 결과의 경우 중심기압의 변화가 다소 급하게 나타나는 경향을 보이는 특성을 가지고 있지만 40km결과에 비해 최저 중심기압이 더욱 뚜렷하게 나타나고 있으며 특히, MANYI case의 경우 관측값 930hPa보다 더 낮은 911.4hPa의 결과를 보이고 있다. 풍속의 경우도 중심기압변화와 유사한 결과를 보이고 있으나, 최대 풍속의 경우 40km 결과에 비해 20km결과가 관측과의 오차범위가 $2{\sim}3\;m/s$ 내외로 나타나고 있다. 그리고 GME모형의 경우 태풍(TD) 발생 약168시간 이전에 예측이 가능한 결과를 보인다. 이 연구의 결과는 다른 기상모형에서 태풍 강도가 약하게 모의되던 현상이 상당히 개선된 것을 알 수 있으며, 이는 20km 고해상도 GME 모형이 태풍예측모형으로 활용이 간능 할 것으로 사료 된다.

• Korean Journal of Ecology and Environment
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• v.51 no.4
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• pp.253-258
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• 2018

Phytoplankton community was studied in relation to a typhoon at Bok-gyo Bridge area in Juam Lake, Korea. In August 31, 2000, a typhoon (Prapiroon) was passed by Juam Lake with great power enough to destroy summer stratification of Juam Lake. Destratification resulted in temporal mixing of the whole water column and changed the physical and chemical properties of water bodies, and caused the changes of the biological properties. The transparency decreased from 195 cm before the typhoon to 84 cm after the typhoon with the resuspension of the bottom sediment. In the vertical distribution of the phytoplankton population, the maximum population was measured at depth of 2 m before the typhoon. However, immediately after the typhoon, the population distributed evenly throughout the entire water layers. The carbon biomass of the phytoplankton was also highest at the depth of 2 m before the typhoon, but immediately after the typhoon, it was uniformly distributed throughout the whole water layers. The vertical profiles of the concentrations of chlorophyll a, however, did not show a significant difference before and after the typhoon. The typhoon induced destratification and restratification altered the taxa of the phytoplankton. The major dominant phytoplankton taxa before the typhoon was diatoms including Aulacoseira granulata, but the green algae overwhelmed the diatoms in cell number and biomass after the typhoon. The chlorophycean dominance was replaced by cyanophycean dominance with the heavy rain and descent of water temperture at the end of September.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.301-301
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• 2011

일반적으로 한반도에 발생하는 호우 피해의 발생원인은 태풍과 집중호우로 대표 할 수 있다. 그러나 수공구조물의 설계시에 호우의 발생원인 별로 치수대책을 마련하는 경우는 거의 없으며, 태풍에 의해서 발생하는 호우사상에 대한 분석은 종종 이루어졌으나, 집중호우로 인한 호우특성을 분석한 경우는 거의 없는 것으로 알려져 있다. 본 연구에서는 강우의 발생 원인을 태풍과 집중호우로 구분하여 각각의 기간에 발생한 강우자료로부터 년최대 시계열을 작성하여 분석하였다. 또한 우리나라에 큰 피해를 줬던 태풍 루사의 발생 전과 후의 변화를 알아보기 위하여 자료기간을 관측개시일부터 2001년까지와 2009년까지로 구분하여 비교하였다. 빈도해석 결과 우리나라 동해안과 남해안은 태풍의 영향을 크게 받고 서해안과 내륙은 집중호우의 영향을 크게 받는 것으로 분석되었고 태풍이 오기 전과 후의 영향이 크게 변화하진 않았으나 확률강우량 값의 증가와 약간의 분포의 변화를 확인 할 수 있었다. 그리고 빈도해석 자료를 이용하여 호우의 발생 원인에 따른 강우강도를 산정하고 각각의 IDF 곡선을 비교분석하였다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.8 no.3
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• pp.122-133
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• 2005

The change of surface sediment composition, shoreline and transection of geography were studied to investigate the Typhoon(Maemi) effect in Naa Beach located in the south area of East sea. In the backshore the volume of gravel is do creased, and increased in the volume of sand. The erosion in the sediment occurred to 4 m in the thickness and effected to 10 m in depth. And the coastline retreated to 12 m after typhoon. During typhoon conditions, higher amplitude waves deepen the wave base, causing much of the lower beach face and the offshore. The upper beach face is extensively eroded during typhoon and sand sediment is redeposited.

• Journal of the Korean Association of Geographic Information Studies
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• v.16 no.1
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• pp.59-66
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• 2013

When the typhoons are passing over the ocean, the ocean environment has both physical and biological impacts on the East, South sea and Yellow sea of Korea. As a result of typhoon path, vertical mixing and upwelling injured colder subsurface water, and leaded to phytoplankton blooming along the typhoons. The ocean environment before and after a typhoon played an important role in the biological effect of sea surface. Although the magnitude of sea surface temperature (SST) gets cooler because of typhoon path, other physical and biophysical responses are quite different such as chlorophyll, K490 and SST. The purpose of this study is to compare with the typhoon path that influenced the Korean Peninsula and ocean environment parameters which were observed by ocean color remotely-sensed data. The MODIS data were used to assess the parameters of ocean environments such as K490 and chlorophyll data from 2002 to 2005. Mean chlorophyll from MODIS data increased by about 1-4% in the East sea after the typhoon. Mean concentration of MODIS chlorophyll in the post-typhoon period increased along the typhoon passage. However, Jeju coastal area has different patterns from those of the East sea.

• 한국방재학회:학술대회논문집
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• 2010.02a
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• pp.64.2-64.2
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• 2010

본 연구는 1985년부터 현재까지 서귀포인근 해안에 직접적인 영향을 주었던 태풍들 중 조위편차 및 피해 사례의 영향성을 고려하여 5개의 태풍을 선정하였으며, 본 연구실에서 개발한 수치모형인 HYCEL-WIND를 이용하여 수치적 분석을 실시하였다. 또한 제주해군기지 건설 전 후에 따른 해일고를 비교하며 방파제 설치에 따른 최대해일고의 변화를 분석하였다.

• Journal of the Korean earth science society
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• v.40 no.2
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• pp.149-162
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• 2019

In the macro-tide open coast of the Korean western coast, typhoon effects were investigated in terms of variations on topography, surface sediment, and sedimentary environment, which appeared before and after the typhoon Kompasu of 2010. The Kompasu of small size and strong intensity landed on the southwestern coast of the Korean Peninsula and passed across the inland between September 1st and 2nd in 2010. Topography and surface sediments before and after the typhoon were measured and sampled along the survey line of 22 sites in the Gochang Donghori intertidal flat. The intertidal area was divided into high tidal zone, middle tidal zone, and lower tidal zone on the basis of mean high water level, mean sea level, and mean low water level. Topographic variation before and after the typhoon represented deposition of average 0.03 m in high tidal zone, erosion of average -0.15 m in middle tidal zone, and erosion of average -0.39 m in lower tidal zone, respectively. Surface sediments of the intertidal flat consisted mainly of fine to medium sands, and the ratio of fine sand was the largest both before and after the typhoon. Surface sediments after the typhoon became finer in mean grain size showing well sorting rather than those before the typhoon.

• Journal of the Korean earth science society
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• v.40 no.1
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• pp.37-45
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• 2019

In spite of continued nourishments, Haeundae Beach in Busan has been suffering from erosion, this being caused by the increased wave energy due to global warming and intermittent typhoon reported by previous works. In the meantime, the typhoon Chaba hit Basan in October 2016. In order to investigate the effects of the typhoon in beach erosion and how fast the beach recovered after the typhoon, repeated beach profiling using a VRS-GPS system was carried out, and the grain size analyses for surface sediments sampled on the beach were conducted. Immediately after the typhoon invasion, Haeundae beach was eroded by 1.4 m in average height. The mean high tide lines were retreated back by 12 m, and beach slope became gentler from $3.8^{\circ}$ to $1.7^{\circ}$. The mean grain sizes of surface sediments became coarser from $1.6{\Phi}$ to $1.2{\Phi}$ after two months, and the sorting well sorted. After two months of typhoon landfall, the mean high tide lines have recovered by 85%, and the beach topography almost recovered. This suggests that the impact of typhoons on Haeundae beach erosion is negligible, and the relaxation time is shorter than that of other beaches.

• Journal of the Korean Association of Geographic Information Studies
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• v.22 no.1
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• pp.93-102
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• 2019

In this study, in order to analyze the possibility of observing a typhoon track based on the Global Navigation Satellite System(GNSS), Typhoon NARI, the 11th typhoon of 2007, was analyzed in terms of the typhoon track as well as the local variation of perceptible water over time. The perceptible water was estimated using data obtained from observatories located on the typhoon track from Jeju to the southern coast of Korea for a total of 18 days from September 7(DOY 250) to September 24(DOY 267), 2007, including the period when the observatories were affected by the typhoon at full-scale, as well as one previous week and one following week. The results show that the trend of the variation of perceptible water was similar between the observatories near the typhoon track. Variation of perceptible water over time depending on the development and landing of the typhoon was distinctively observed. Several hours after the daily maximum of perceptible water was found at the JEJU Observatory, the first struck by the typhoon on the typhoon track, the maximum value was found at other observatories located on the southern coast. In the observation period, the time point at which the maximum perceptible water was recorded in each location was almost the same as the time point at which the typhoon landed at the location. To analyze the accuracy of the GNSS-based perceptible water measurement, the data were compared with radiosonde-based perceptible water data. The mean error was 0.0cm, and the root mean square error and the standard deviation were both 0.3cm, indicating that the GNSS-based perceptible water data were highly accurate and precise. The results of the this study show that the GNSS-based perceptible water data may be used as highly accurate information for the analysis of typhoon tracks over time.