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레이더 자료의 강우보정 및 Vflo를 활용한 도심하천의 홍수량 산정
강보성 ( Bo-seong Kang ),양성기 ( Sung-kee Yang ),김용석 ( Yong-seok Kim ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.4
This research aims at comparing the accuracy of flood discharge estimation. For this, we focused on the Oedo watershed of Jeju Island and compared flood discharge by analyzing the values as follows: (1) the concentration of the lumped model (HEC-HMS) and distributed model (Vflo), and (2) the in-situ data using Fixed Surface Image Velocimetry (FSIV). The flood discharge estimation from the HEC-HMS model is slightly larger than the Vflo model results. This result shows that the estimations of the HEC-HMS are larger than the flood discharge data by 4.43 to 36.24% and that of the Vflo are larger by 8.49 to 11%. In terms of the error analysis at the peak discharge occurrence time of each mapping, HEC-HMS is one hour later than the measured data, but Vflo is almost the same as the measured data.
강보성 ( Bo Seong Kang ),양성기 ( Sung Kee Yang ),정우열 ( Woo Yeol Jung ),김용석 ( Yong Seok Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.4
This study Analyzed four of seven runoffs which had happened in 2012 in comparison with the runoffs shown in Kalesto data, using the fixed surface image velocimetry (FSIV) installed at Oedo stream, Jeju Island. As a result of identifying a runoff curve graph, it was analyzed that the flood runoffs calculated with two observation devices were almost equivalent. As the differences in peak flows were 10 m3/s, 0.7 m3/s and 3 m3/s, the very similar result values were calculated. Even though there were errors in RMSE(Root Mean Square Error) made by two observation devices according to the degree of the peak flow, the values of R² by flood event were 0.89, 0.87, 0.86 and 0.82, showing the result values almost close to 1. Therefore, there was a very high correlation in flood runoffs calculated with two observation devices. This research method was considered to be a very suitable method to measure unexpected flood runoffs which could happen in the island area such as Jeju island during bad weather.
강보성 ( Bo Seong Kang ),양성기 ( Sung Kee Yang ),정우열 ( Woo Yeol Jung ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.4
As global warming has accelerated to weather in recent years, and The frequent floods are creating heavy rains and typhoons followed by considerable damage in Jeju. This study estimated design flood discharges and flood stage in Jeju, considering climate change in connection with RCP scenario, the 5th IPCC Report recently published. It also analyzed the period which might be subject to the risk of flooding in downstream of Oedo Stream. As a result, it has analyzed that there might be a risk of flooding when there were 80 years or more rainfall events in 35 years that rainfall would have increased by 10%, 69 years that 100 years or more heavy rain and rainfall would have increased by 20%, and 104 years that 100 years or more heavy rain and rainfall would have increased by 20%. It is expected that this study results of rainfall increasing trend caused by climate change will be helpful to minimize the damage of floods which will secure the future of Jeju.
김부영(Boo-Young Kim),강보성(Bo-Seong Kang),김병국(Byung-Guk Kim),박소영(So-Young Park),오정훈(Jeong-Hoon Oh),서은주(Eun-Joo Seo) 대한두경부종양학회 2007 대한두경부 종양학회지 Vol.23 No.2
Kimura disease is an uncommon chronic inflammatory disorder of unknown etiology. Clinically, patients present nontender subcutaneous swelling in the head and neck region. Peripheral eosinophilia, an elevated serum IgE are also present. The clinical course of Kimura disease is often progressive, and the main problem with treatment is disease recurrence. Treatment options in the recurrent cases range from observation to surgical excision, steroid therapy, and radiotherapy. We report a case of recurrent Kimura disease, initially thought to be chronic submandibular sialadenitis, along with the appropriate review.
제주도의 강우특성을 고려한 한천유역의 면적감소계수 산정연구
강명수 ( Myung-soo Kang ),양성기 ( Sung-kee Yang ),김용석 ( Young-seok Kim ),강보성 ( Bo-seong Kang ),양세창 ( Se-chang Yang ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.12
In this study, we calculated the fixed-type Areal Reduction Factor (ARF) of the Hancheon River basin in Jeju Island, and compared the calculated ARF and the ARF of the four major river basins suggested by the Ministry of Land, Infrastructure and Transport. As a result, the maximum fluctuation ratios of ARF for the four major river basins calculated using area, frequency, and initial duration time were significant: 7.61% for the Hangang River basin; 12.69% for the Nakdonggang River basin; 8.09% for the Kumgang River basin; and 17.98% for the Yeongsangang River basin. In addition, the differences between the maximum and minimum value of ARF for the Hancheon River basin based on 48 hours was 2.13%, and it was smaller than the one for the four major river basins: 8.92% for the Hangang River basin; 11.41% for the Nakdonggang River basin; 8.87% for the Kumgang River basin; and 17.17% for the Yeongsangang River basin. The Yeongsangang River basin had the highest difference.
한천유역의 수문학적 특성을 고려한 관측자료 기반 홍수량 산정
양성기 ( Sung-kee Yang ),김민철 ( Min-chul Kim ),강보성 ( Bo-seong Kang ),김용석 ( Yong-seok Kim ),강명수 ( Myung-soo Kang ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.12
This study reviewed the applicability of the existing flood discharge calculation method on Jeju Island Han Stream and compared this method with observation results by improving the mediating variables for the Han Stream. The results were as follows. First, when the rain-discharge status of the Han Stream was analyzed using the flood discharge calculation method of the existing design (2012), the result was smaller than the observed flood discharge and the flood hydrograph differed. The result of the flood discharge calculation corrected for the curve number based on the terrain gradient showed an improvement of 1.47 - 6.47% from the existing flood discharge, and flood discharge was improved by 4.39 - 16.67% after applying the new reached time. In addition, the sub-basin was set separately to calculate the flood discharge, which yielded an improvement of 9.92 - 32.96% from the existing method. In particular, the steepness and rainfall-discharge characteristics of Han Stream were considered in the reaching time, and the sub-basin was separated to calculate the flood discharge, which resulted in an error rate of -8.77 to 8.71%, showing a large improvement of 7.31 - 28.79% from the existing method. The flood hydrograph also showed a similar tendency.