• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.3
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• pp.299-309
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• 2006

In recent years, a large natural disasters have occurred due to worldwide abnormal weather and the amount of damage has been increased more resulting from high density population and a large-sized buildings of the urbanized area. In this study. we estimate the flooded area according to rainfall probability intensify and sea level in Woreong dong, Masan occurred flood damages by typhoon Maemi using SWMM, a dynamic rainfall-runoff simulation model in urban area, and then analyze the damage of flood expected area through connecting with GIS database. In result, we can predict accurately expected area of inundation according to the rainfall intensity and sea level rise through dividing the study area into sub-area and estimating a flooded area and height using SWMM. We provide also the shelter information available for urban planning and flood risk estimation by landuse in expected flood area. Further research for hazard management system construction linked with web or wireless communication technology expects to increase its application.

• Journal of the Korean Society of Marine Environment & Safety
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• v.13 no.4
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• pp.9-14
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• 2007

This study reviewed the behavior(movement) characteristics of floating marine debris flowing in the Nakdong River Estuary using a simple numerical particle-tracking model on the conditions of the maximum water discharge outflow from the Nakdong River barrage during the passage of typhoon Maemi in 2003. The simulation showed that the particle distribution and movement of floating marine debris in the Nakdong River Estuary reached a stable state at 72 hours after the typhoon had passed, during the flood period of river discharge. The quantity of floating particles distributed on the east coast of Gadeok and Jinu Islands increased by 40% at 33 hours after starting the model, while the change in other sea areas was 20-40%.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.29 no.1
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• pp.173-179
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• 2005

In succession to previous study(A Study on the Limit of Anchor Dragging for Ship at Anchor sim I), the experiment of anchor dragging by ship handling simulator was performed to investigate the anchoring stability of ship at anchor in this study. The purpose of this experiment is to check the behavior charateristics of ship being dragged and the limit of anchor dragging for ship at anchor. A small tanker ship, which had been anchored in Jinhae Bay when the typhoon MAEMI passed on September 2003, was chosen as model ship for the experiment of anchor dragging and the result of experiment was confirmed to be very similar to the result of theoretical review and field report.

• Korean Journal of Ecology and Environment
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• v.38 no.3 s.113
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• pp.429-434
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• 2005

The dynamics of phytoplankton community after the formatiom of turbidity was assessed at Dam barrage of Lake Imha from May 2003 to July 2004. The maximum turbidity of 1221 NTU during September and October 2003 was well correlated with heavy precipitation caused by Typoon Maemi. A total of 102 phytoplankton taxa was identified and the most abundant phytoplankton group was Bacillariophyceae with 63 taxa, followed by Chlorophyceae with 23 taxa, Cyanophyceae with 9 taxa, 3 taxa each of Synurophyceae and Cryptophyceae and Euglenophyceae with 1 taxon. The total standing crops ranged between 270 indls. $mL^{-1}$ and 4,515 indls. $mL^{-1}$ during the investigation Periods. The three species, Cryptomonas ovata, Cyclotella sp. and Microcystis aeruginosa predominated in sequence after the decrease of turbidity.

• Proceedings of KOSOMES biannual meeting
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• 2007.11a
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• pp.23-28
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• 2007

This study estimated the behavior(movement) characteristics of floating marine debris flowing in the Nakdong River Estuary using a simple numerical particle-tracking model. This numerical experiment considered the maximum water discharge outflow from the Nakdong River barrage during the passage of typhoon Maemi in 2003. The simulation showed that the particle distribution and movement of floating marine debris in the Nakdong River Estuary reached a stable state at 72 hours after the typhoon had passed, during the flαxl period of river discharge. The quantity of floating particles distributed on the east coast of Gadeok and Jinu Islands increased by 40% at 33 hours after starting the model, while the change in other sea areas was $20{\sim}40%$.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.40 no.3
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• pp.225-231
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• 2004

The power and scale of 950 hPa typhoon "Maemi" which struck the shore of Gosung in Kyungnam Province was same as that of 951 hPa typhoon "Saraho" in 1959. For the purpose of getting the safety of training ship "KAYA", we anchored at Jinhae Bay with riding at two anchors paid out 8 shackles of cable respectively. By the way when wind force being over 30m/s, we could not keep the safety of the ship "KAYA" by means of the holding power of an anchor only. Just by using the main engine moderately, we were able to maintain the security of the ship. The holding the main engine moderately, we were able to maintain the security of the ship. The holding power of an anchor according to the way of anchoring, the quality of sea bottom, the direction and speed of wind and current, and the length of an anchor cable were analyzed. The obtained results are summarized as follows : 1. When riding at two anchors rather than lying at single anchor we could get a good holding power. 2. There was a big difference in holding power according to the quality of the bottom. 3. It would be best anchoring in a soft mud area than in any other place as possible. 4. It would also be desirable to set anchor shackles much more than equipment number prescribed in regulation in order to get safety of a ship providing against typhoon.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.37-37
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• 2011

태풍 루사나 매미에 의한 피해사례를 보면 하천 횡단 구조물 본체가 파괴되는 피해 뿐 만 아니라, 구조물과 제방과의 연결부가 세굴되어 붕괴되는 사례가 많이 발생하였다. 하천설계기준(2009)에는 이러한 보와 제방의 연결부 부분을 연결호안이라 하여 관련 기준을 제시하고 있으나, 설치구간의 길이를 정할 때 하천의 규모나 하도의 특성을 고려하지 못하고 일률적으로 결정하도록 하고 있다. 이에 건설기술연구원에서는 상류 Froude 수와 보 높이를 변수로 하는 연결호안 설치 길이에 대한 실험식(2006)을 제시하였다. 하지만 보 접속부 세굴에 영향을 주는 인자는 상류의 Froude 수와 보의 높이 뿐만 아니라, 상 하류 수위차, 보의 형상, 제방의 재료적 특성 등 많은 요인들이 존재한다. 이 중 본 연구에서는 상 하류 수위차와 보 접속부 세굴 범위의 관계를 파악하고자 한다. 보 접속부 세굴에 대한 수치모의에 앞서 Gill(1972)와 Dongol(1990)이 수행하였던 교대세굴 자료를 바탕으로 Flow-3D의 세굴에의 적합성 및 적용성을 검토하였다(그림 2참고). 검토 결과 수치모의의 입력 변수를 조정함으로써 실험값과 가깝게 나타나는 것을 확인하였다. 이렇게 조정된 변수를 이용하여, 보 접속부 세굴에 대한 수치모의는 상 하류의 수위차에 대해 다양한 검토를 하기 위해 상류의 수위를 1.0m로 고정한 채하류부의 수위를 0.2~0.8m까지 0.1m간격으로 변화시켰으며, 유사의 대표 입경은 0.63mm로 주문진 표준사를 가정하였다. 모의 시간은 평형세굴심이 발생할 때까지 수행하였고, 난류모델로는 LES(Large Eddy Simulation)를 채택하였다. 모의 결과 상 하류 수위차가 증가할수록 보 하류부 세굴 길이($L_d$)가 증가 하였으며, 세굴의 폭($B_d$) 역시 증가하였다. 그림 3은 수치모의 결과로 세굴이 발생된 제방의 모습을 도시한 것이다.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.31-31
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• 2011

해마다 반복되는 수해를 대비하여 배수펌프장을 설치하고, 취수보를 철거하는 방법으로 수해예방시스템을 고도화 시키고 있지만, 증가하는 홍수량에 대한 대비책으로는 역부족이다. 따라서, 홍수 피해에 대한 선제적 대응방안으로 강변저류지를 설치하여 상습 침수구역에 대한 대비가 진행되고 있다. 강변저류지 설치를 통해 유역의 홍수량을 분담하고 인접지역의 침수피해를 예방하는 역할을 기대할 수 있다. 국내에서도 영월군의 상습침수구역에 대한 대비책 중 하나로 국토해양부 및 강원도가 함께 영월강변저류지 조성공사를 추진하고 있다. 영월군은 지난 2002년과 2003년에 태풍 '루사'와 '매미'로 인해 심각한 피해를 입었으며, 2006년 집중호우시에도 현재 저류지 예정지역인 방절리 일대와 영월읍 시가지, 북쌍리 등이 대규모로 침수피해를 입은 바 있다. 해당 저류지의 총 넓이는 68만 8천 $m^2$로 물 290만 $m^3$을 가두어 둘 수 있는 규모이다. 하지만, 영월 강변저류지의 저류용량이 290만 $m^3$에 불과해 홍수예방 효과가 미흡하다는 지적이 잇따르고 있다. 따라서, 적절한 수문운영을 통해 홍수저감량과 저류효과를 증대시키는 홍수예방 방안을 제안하고자 한다. 본 연구에서는 유전알고리즘의 적용을 통하여 강변저류지에 설치된 수문의 운영 방법을 개선함으로써 홍수저감량을 최대화하고자 하였다. 수리 수문학적 모형인 HEC-RAS, HEC-I 모형을 연계 운용하여 평창강 유역을 대상으로 수문분석, 홍수유출량 분석, 하류 하천의 홍수영향 분석 결과를 도출하였다. 강변저류지 설치로 인하여 저류지 직하류부를 기준으로 약 $131\;m^3/s$의 첨두홍수량 저감 효과가 발생하는 것으로 검토되었지만, 본 연구에서 제안된 최적화 기법이 적용된 수문운영 방법을 병행하여 운영한다면 추가적으로 $24\;m^3/s$를 저감하는 효과를 얻을 수 있다. 효율적으로 저류지를 운영하여 홍수피해를 사전에 방지하고 나아가 다른 저류지 유역에도 본 연구를 적용하여 홍수피해를 줄이고 합리적으로 용수를 이용하는데 기여할 수 있을 것으로 사료된다.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.12
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• pp.1209-1217
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• 2008

For efficient turbid water management a SWAT model was established for the Imha-Andong watershed where serious turbid water problems have frequently occurred. To evaluate soil loss combined with rainfall runoff process, the analysis focused on comparing the daily runoff discharge and concentration of suspended sediment (SS) using measured data sets. The results of annual SS load analysis for each sub-basin using the calibrated model showed that in the entire target watershed the soil loss ranged from 0.7 to 5.9 tons/ha in year 2005 and from 3.0 to 34.0 tons/ha in year 2003 when the typhoon 'Maemi' severly affected the area. In the future, it is suggest to increase model simulation accuracies supported by a long-term and extensive monitoring to enhance basin-wide suspended sediment estimation and management.

• Korean Journal of Construction Engineering and Management
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• v.11 no.1
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• pp.130-141
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• 2010

Poor expertise in equipment operation and installation, coupled with unpredictable natural disaster, usually directly leads to disastrous accidents of large lifting equipment such as tower cranes. For example, 52 tower cranes fell down due to the unstable support in Korea at the attack of Typhoon "Maemi" in 2003, which damaged property and caused loss of life. In high-rise construction projects, top-slewing or luffing-jib tower cranes needs checking the stability of lateral-support in addition to the bottom support such as the foundation. In this study, the optimization algorithm for lateral-support of tower cranes is conducted, which is expected to enhance the structural stability of tower cranes and save the cost in conflict with the safety.