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충북 보청천 유역의 유출 분석을 통한 초소수력 에너지 평가
천호권(Ho-Kwon Cheon),임유리(Yu-Ri Lim),안상억(Sang-Eok Ahn),이효상(Hyo-Sang Lee) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.9
최근 탄소 저감 및 탄소 중립화를 위한 재생에너지 개발은 활발히 연구되고 있으며, 특히 자연 친화적인 초소수력 개발이 주목받고 있다. 본 연구에서는 한반도의 중부지방에 있는 대표적인 소규모 산지 유역인 보청천 유역을 대상으로 유출 특성을 분석하고 소수력 발전의 개발 가능성을 평가한다. 대상 유역의 최근 30년간의 수문자료(1991~2022년, 보은기상관측소 및 기대 수위관측소) 및 GIS 자료를 통하여 유출 분석, 종단 선형 및 유황분석을 통하여 재생에너지 개발 부존량과 개발 가능성을 평가한다. 대상 유역의 기대교지점의 유출률은 약 56%이며, 대상 유역의 총에너지양은 14,832kWh며, 현재 하천 현황 아래에서 보 등을 활용한 개발 가능량은 평수랑(Q185, 5.2 m³/s)-약 270kWh), 갈수량 (Q355, 2.4 m³/s)- 123kWh다. 이를 통하여 소규모 산촌마을의 에너지 자립의 가능성을 보여주고 있다. Renewable energy has been researched to achieve the goal of neutralizing carbon emissions in recent decades. In particular, pico-hydropower is highlighted due to its low impact on the environment. This study estimated the potential and possibility of pico-hydropower based on catchment flow characteristics at a small mountainous catchment in Bocheong, South Korea. Hydrological data from Boen Meteorological station and Gidae flow observation station (1991-2022) were used for the runoff coefficient, flow duration analysis, etc. The results show that the potential energy and possible capacity of hydropower of the study catchment are 14,832 kWh and 270 kWh (at Q185, 5.2 m³/s), respectively. The minimum value of possible hydropower (at Q355, 2.4 m³/s) is 123 kWh, which shows that potential for the pico-hydropower development for a small villages in mountainous catchment.
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이효상,김동영,천호권,안상억 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.2
New design of stepping stones is suggested in public infra-structures in water-environmental area with a concept of Nudge in behavioral economics. The stepping stone, which is frequently used in daily life, is a dangerous facility which causes death incident in flood events. It is a common public facility that is difficult to manage due to its large number in nation wide. The fatal accidents of people fall in the middle of the steeping stone have occurred every years since 2000, such as a death case of Ulsan in 2023. This study presents a new design in which the ends of the steeping stones are little lower than the central part, in order to cause a small inconvenience to the users and allow them to make better choices to avoid uisng dagerous stepping stone on their own. This both ends of the stepping stones is flooded in low water level leading a situation in which shoes of people can get wet before the river water level reaches a dangerous level. This design induces people to voluntarily avoid. using this stepping stones. A survey was conducted with 100 people of 20s using a Google form to conform its effectiveness. The results show that respondents who will cross the stepping stone if the stepping stone entrance of the stepping stone was submerged down 10% from 64%. New designs of public infra-structures using Nudge theory, such as stepping stone, will make our river environments more safe from disasters in near future.
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청주 무심천 유역의 2017년 7월 16일 홍수사상을 반영한 설계홍수량의 산정
장형준,이호진,황명규,천호권,이효상 위기관리 이론과 실천 2018 Crisisonomy Vol.14 No.6
This study aims to evaluate the effect of the 2017 flood on design flood estimation at Mushim River in Cheongju. The design floods were estimated in two cases (CASE 1 and CASE 2) and compared to each other using hydrological data from 1967 to 2016 and 1967 to 2017, respectively. The FARD model was used to estimate the probable rainfall, and the HEC-HMS model was calibrated based on 15 flood events. All calibrated parameter sets were applied to the two cases to estimate the design flood. The range of the design flood was estimated from 364.9 to 1,231.6 m3/s for Case 1, while from 431.0 to 1,455.0 m3/s for CASE 2. The finding that the design flood of CASE 2 was approximately 18% greater than that of CASE 1 indicates that the flood event on July 16th, 2017 increased the design flood in this river by 66.1 ~ 412.4 m3/s. The observed peak discharge on July 16th 2017 (1,028.5 m3/s) was below the current target design flood (1,355 m3/s) but the maximum estimated design flood in CASE 2 was greater than the current target, which confirmed an increase of flood risk. 본 연구의 목적은 2017년 7월 16일 홍수사상이 청주 무심천 유역의 설계홍수량 산정에 미치는 영향을 확인하는 것이다. 설계홍수량은 1967 ~ 2016년까지의 수문자료를 바탕으로 한 Case 1 및 1967 ~ 2017년 7월까지의 수문자료를 바탕으로 한 Case 2로 구분하여 산정되었다. 본 연구에서는 FARD 모형을 활용하여 확률강우량이 산정되었으며, 2000년 이후 15개 관측 홍수사상을 바탕으로 HEC-HMS 모형을 검정하였다. 검정된 모든 HEC-HMS 모형의 매개변수는 설계홍수량 산정 과정에 적용되었다. 그결과, Case 1의 설계홍수량 모의 결과는 364.9 ~ 1,231.6 m3/s이고, Case 2의 결과는 Case 1과 비교하여66.1 ~ 412.4 m3/s(약 18%) 증가된 431.0 ~ 1,455.0 m3/s를 나타내고 있다. 이를 통하여 2017년 7월 16일홍수사상이 설계홍수량 증가에 영향을 미치는 것을 확인하였다. 2017년 7월 16일 홍수사상의 최대관측 유량은 1,028.5 m3/s로, 현재 적용되고 있는 설계홍수량인 1,355 m3/s보다 낮은 수치를 보이고있다. 그러나 Case 2에서 모의된 최대 설계홍수량은 설계홍수량보다 큰 수치를 나타내고 있어, 홍수에 대한 청주 무심천 유역의 위험성이 증가하는 것으로 판단할 수 있다.
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충청북도 초강 유역의 관측자료를 바탕으로 한 유출특성분석
안상억,이승민,이효상,천호권 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.11
There is increasing risks in water-resources management in South Korea due to large-scale floods and droughts in recent years. A detailed analysis of water budget in catchment scale is required. Hydrological data including precipitation, stream flow, and evapotranpiration, are highly valuable and crucial for water resource studies. Chogang catchment in Chungbuk is important because evapotranspiration data have been measured at the Yuelli site in the catchment since 2019. This study analyzed the water balance and flow duration curve with measured hydrological data in the period of 2019-2021. The water balance analysis shows the potential of period analysis in the flood season (June-September) and non-flood season (October-May). The runoff ratio (runoff/rainfall) was 0.53, 0.56, and 0.43 in a year, in the flood season, and in the non-flood season, respectively. A runoff ratio of 0.42 should be applied for water resource management in the Chogang. This is smaller than South Korea's general runoff ratio of 0.6. The ratio of the observed empirical emission (AET) to potential evapotranspiration (PET) differed between the non-flood period (0.63, 0.75, 0.79, and 0.72) and the flood season (1.25, 1.29, 1.49, and 0.72), indicating that AET is greater than PET in summer due to sufficient water supply and active plant growth. The coefficients for actual and potential evapotranspiration were 1.2 and 0.7 for the flood period and non-flood period, respectively. In the future, reliable runoff characteristics of mountainous basins in Chungcheongbuk-do will be suggested based on the accumulation of hydrological observation data within the basin.
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