임계수준 방법을 이용한 물 부족량-지속기간-빈도 곡선의 제안 및 적용

성장현,정은성,Sung, Jang Hyun,Chung, Eun-Sung 한국수자원학회 2014 한국수자원학회논문집 Vol.47 No.11

This study evaluated hydrological drought the using the annual minimum flow and the annual maximum deficit method and proposed the new concept of water deficit-duration-frequency curves similar to rainfall intensity-duration-frequency curves. The analysis results of the annual minimum flow, the return periods of hydrological drought in the most duration of 1989 and 1996yr were the longest. The analysis results of the annual maximum deficit, the return periods of 60-days and 90-day deficit which are relatively short duration were the longest in 1995yr, about 35-year, Hydrological drought lasted longer was in 1995, the return period was about 20-year. Though duration as well as magnitude is a key variable in drought analysis, it was found that the method using the annual minimum flow duration not distinguish duration.

철탄화물(鐵炭化物) 석출립자(析出粒子) 성장속도(成長速度) 기구(機構)에 관한 연구(硏究)

성장현 ( Jang Hyun Sung ),이상윤 ( Sang Yun Lee ) 東亞大學校附設 石堂傳統文化硏究院 1981 石堂論叢 Vol.5 No.-

This study reports the growth charactistics of iron carbide particles precipitated in eutectoid steel spheroidized at 600°, 650° and 700℃ after quenching and tempering as an initial heat treatment to produce a constant particle size distribution. The results obtained are summarized as follows; 1. Optical micrographs have revealed that most of the grain boundaries of ferrite matrix are outlined by a string of carbide particles and particles within the grains appear to be spherical in shape and small in amount. 2. Hardness measurements have shown that the relation between the Vickers hardness and the number of particles per unit area on polish surface coircides with the Hall-Petch relation with the following equation Hv=-6.46×10(5) NΔ(-1/2)+312 3. It has been shown that that ferrite grains grow during spheroidizing and changes in hardness are dependent upon the following relation Hv=3.12l(-1/2)+105 4. The average number of second phase particles pinning ferrite grains increases as spheroidizing temperature decreases, causing the growth of ferrite grains to be retarded. 5. Growth kinetics analysis has show that the average value of activation energy for carbide spheroidization is 48.5 Kcal/mole and the growth of precipitate particles involves the coupled iron-carbon diffusion.

홍수빈도해석 지침서 제정을 위한 연구

성장현(Jang Hyun Sung),정대일(Dae Il Jeong),김영오(Young-Oh Kim) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

GEV 분포와 역사 자료 이용 알고리즘 EPMWA의 접목

성장현(Jang Hyun Sung),김영오(Young-Oh Kim) 대한토목학회 2008 대한토목학회 학술대회 Vol.2008 No.10

도시 하수관거 시스템의 확률론적 저항능력 산정

성장현(Sung Jang Hyun),김영오(Kim Young-Oh) 대한토목학회 2006 대한토목학회 학술대회 Vol.2006 No.10

대표농도경로 (RCP)에 따른 21세기 말 우리나라 극한강수 전망

성장현(Jang Hyun Sung),강현석(Hyun-Suk Kang),박수희(Suhee Park),조천호(ChunHo Cho),배덕효(Deg Hyo Bae),김영오(Young-Oh Kim) 한국기상학회 2012 대기 Vol.22 No.2

표준강수 증발산지수(SPEI)를 이용한 남한지역의 가뭄심도 평가

김병식,성장현,강현석,조천호,Kim, Byung-Sik,Sung, Jang-Hyun,Kang, Hyun-Suk,Cho, Chun-Ho 한국수자원학회 2012 한국수자원학회논문집 Vol.45 No.9

Drought is a non-negligible disaster of nature and it is mainly caused by rainfall shortage for a long time though there are many definitions of drought. 'Standard Precipitation Index' (SPI) that is widely used to express the level of meteorological drought intensity has a limit of not being able to consider the hydrological changes such as rainfall and evapotranspiration caused by climate change, because it does not consider the temperature-related variables other than the precipitation. Recently, however, 'Standardized Precipitation Evapotranspiration Index' (SPEI), a drought index of new concept which is similar to SPI but can reflect the effect of temperature variability as well as the rainfall change caused by climate variation, was developed. In this study, the changes of drought occurrence in South Korea were analyzed by applying SPEI for meteorological data (1973~2011) of 60 climate observatories under Korea Meteorological Administration (KMA). As the result of application, both of SPI and SPEI showed the trend of deepening drought in spring and winter and mitigating drought in summer for the entire nation, with SPI showing greater drought intensity than SPI. Also, SPI and SPEI with 12 months of duration showed that severe droughts with low frequency of around 6 years are generally being repeated.

SWAT 모형과 TOPSIS 기법을 이용한 우리나라 물이용 취약성 평가

원광재,성장현,정은성,Won, Kwyang Jai,Sung, Jang Hyun,Chung, Eun-Sung 한국수자원학회 2015 한국수자원학회논문집 Vol.48 No.8

This study assessed the water use vulnerability for 12 basins of South Korea. The annual runoff of 12 basins are derived using a Soil and Water Assessment Tool (SWAT) and the calculated runoff per unit area and population are compared with each basin. The 18 indicators are selected in order to assess the vulnerability. Those are classified by aspects of demand, loss and supply of water use. Their weighting values used Entropy method to determine objective weights. To quantitatively assess the water use vulnerability, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) based on multi-criteria decision making are applied. The results show that the water availability vulnerability of Hyeongsan River has the highest value followed by Sapgyo River; Dongjin River; Seomjin River; Anseong River; Mangyung River; Nakdong River; Tamjin River; Youngsan River, Geum River; Taehwa River; and Han River. The result of this study has a capability to provide references for the index deveopment of climate change vulnerability assessment.

레이더 강우자료와 분포형 S-RAT모형을 활용한 홍수유출모의

임주호,성장현,황석환,김병식,Lim. Joo-Ho,Sung. Jang Hyun,Hwang. Seok-Hwan,Kim. Byung-Sik 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5

이 논문에서는 최근 돌발홍수 피해가 잦은 강원도 삼척 오십천 및 낙동강 감천유역을 대상으로 홍수유출을 모의하였다. 돌발 홍수 분석을 위하여 우선, 강우의 시공간적 변동성 및 발달상황을 고려할 수 있는 레이더 강우자료가 확보되어야 하지만 레이더 강우자료는 신뢰성이 비교적 확보가 되지 않아서 실제 지상강우처럼 사용하기에는 어려움이 있다. 따라서 이 연구에서는 강릉기상레이더의 단일편파 S-band자료와 비슬산강우레이더의 이중편파 S-band자료를 비교, 분석하여 유출모형에 대한 기여정도를 알아보았다. 격자 형태의 레이더 강우자료와 GIS정보의 효율적 이용을 위해서는 분포형 모형이 필요하게 되고, 이 연구에서는 분포형 모형으로 S-RAT을 이용하였다. 연구결과, 레이더 강우자료와 분포형 모형을 이용했을때 첨두유량 및 첨두시간의 정확도가 관측값에 비교적 유사하였다. This study simulated flood runoff of the Gamcheon Basin on the Nakdong River and Ohsipcheon Basin in Samcheok, Gangwon-do, where they frequently recently suffered from flash flood damages. First, consolidating radar rainfall data to consider time and spacial variabilities and development situations is necessary for an analysis of the flash floods. However, radar rainfall data are not reliable enough that it is difficult to use them as measurements of actual ground rainfall. Hence, this paper compared and analyzed the single polarization S-band data of the Gangneung meteorological radar and dual polarization S-band data of the Mt. Biseul radar to grasp their level of contribution to the runoff simulation. Second, a distributed hydrological model is necessary to effectively use GIS information and radar rainfall data of the grid format. Hence, in this paper, we used the S-RAT model as a distributed hydrologic model. The results of this study showed that the accuracy of peak discharge and time when using the distributed hydrologic model and radar rainfall data were similar to the observed values.

기상학적 가뭄지수와 수문학적 가뭄지수의 비교

이보람,성장현,정은성,Lee, Bo-Ram,Sung, Jang Hyun,Chung, Eun-Sung 한국수자원학회 2015 한국수자원학회논문집 Vol.48 No.1

In this study, meteorological drought indices were examined to simulate hydrological drought. SPI (Standardized Precipitation Index) and SPEI (Standardized Precipitation Evapotranspiration Index) was applied to represent meteorological drought. Further, in order to evaluate the hydrological drought, monthly total inflow and SDI (Streamflow Drought Index) was computed. Finally, the correlation between meteorological and hydrological drought indices were analyzed. As a results, in monthly correlation comparison, the correlation between meteorological drought index and monthly total inflow was highest with 0.67 in duration of 270-day. In addition, a meteorological drought index were correlated 0.72 to 0.87 with SDI. In compared to the annual extremes, the relationship between meteorological drought index and minimum monthly inflow was hardly confirmed. But SDI and SPEI showed a slightly higher correlation. There are limitation that analyze extreme hydrological drought using meteorological drought index. For the evaluation of the hydrological drought, drought index which included inflow directly is required.