하수관로의 노후도에 따른 불명수 산정

유순유 ( Soonyu Yu ),박규홍 ( Kyoohong Park ) 한국물환경학회(구 한국수질보전학회) 2016 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2016 No.-

I/I 처리 비용 최소화를 위한 하수관로 유지보수 우선순위 산정

유순유(Yu, Soonyu),박규홍(Park, Kyoohong) 대한토목학회 2016 대한토목학회 학술대회 Vol.2016 No.10

하수관로의 면단위 및 선단위 정비 우선순위 결정을 위한 AHP-PROMETHEE기법의 적용

안호성,유순유,이태훈,박규홍,Ahn, Hosung,Yoo, Soonyu,Lee, Taehoon,Park, Kyoohong 대한상하수도학회 2020 상하수도학회지 Vol.34 No.4

Since sewer rehabilitation program requires long construction period and enormous capital investment, determination of rehabilitation priorities is important with systematic planning considering appropriate evaluation parameters. In this research, we applied PROMETHEE(Preference Ranking Organization METHod for Evaluations) known as very objective and scientific multi-criteria decision-making analysis, using the weights determined by AHP(Analytic Hierarchy Process) for the selected sewer evaluation items to calculate the rehabilitation priorities for each sewer sub-catchment in basin Gusan 1 of Seoul. Preference functions and preference thresholds were estimated for each criterion of ratio of lack of hydraulic capacity of sewers, defect ratio, ratio of sewers with velocity less than its minimum criteria, and density of sewers in the sub-catchment. As a result, it was found that region d had the first priority among four sub-catchments. For each and every sewer located in region d, we could also rank sewers to be rehabilitated urgently.

WLC기법을 적용한 상수도관망 해석을 위한 비용인자선정에 관한 연구

이재훈,유순유,김형준,박규홍 대한환경공학회 2005 대한환경공학회 학술발표논문집 Vol.2005 No.12

노후 상수도관망에 적용하기 위한 수압 위주의 관망 해석기법의 검토

박규홍,유순유,박상헌,이재훈 대한환경공학회 2005 대한환경공학회 학술발표논문집 Vol.2005 No.12

기후변화에 따른 주요 도시의 하수도 침수 재현기간 예측

박규홍,유순유,뱜바도지엘베자르갈 대한상하수도학회 2016 상하수도학회지 Vol.30 No.1

In this study, rainfall characteristics with stationary and non-stationary perspectives were analyzed using generalized extreme value (GEV) distribution and Gumbel distribution models with rainfall data collected in major cities of Korea to reevaluate the return period of sewer flooding in those cities. As a result, the probable rainfall for GEV and Gumbel distribution in non-stationary state both increased with time(t), compared to the stationary probable rainfall. Considering the reliability of ξ1, a variable reflecting the increase of storm events due to climate change, the reliability of the rainfall duration for Seoul, Daegu, and Gwangju in the GEV distribution was over 90%, indicating that the probability of rainfall increase was high. As for the Gumbel distribution, Wonju, Daegu, and Gwangju showed the higher reliability while Daejeon showed the lower reliability than the other cities. In addition, application of the maximum annual rainfall change rate (ξ1·t) to the location parameter made possible the prediction of return period by time, therefore leading to the evaluation of design recurrence interval.

기후변화에 따른 하수관거시설의 계획우수량 산정을 위한 일반극치분포 분석

이학표,유순유,유재나,박규홍 대한상하수도학회 2012 상하수도학회지 Vol.26 No.2

Climate change has brought precipitation events that exceed the capacity of the sewer system frequently occur and then urban sewer system often fails to cope with the excessive waters, resulting in more damages due to flooding in the cities. Therefore, the uncertainty of climate change should be predicted and the currently applied design criteria for storm sewers need to be re-evaluated as well. In this research, statistical analysis on both stationary and non-stationary climate were implemented using past rainfall data measured in Seoul with generalized extreme value (GEV) distribution and Gumbel distribution. In the non-stationary climate, the characteristics of rainfall were estimated considering the location parameter (ξ) including the variable of time (t). When the probable rainfall depth estimated in non-stationary climate was compared with that of the stationary climate, it increased by 1.1mm to 6.2mm for GEV distribution and by 1.0mm to 4.6mm for Gumbel distribution during the same return periods used in each computation. As the rate of change in annual maximum rainfall (ξ1·t) was applied to the estimated location parameter, the temporal change of the return period could be predicted,thus making it possible to evaluate the design return period. Therefore, the life expectancy and design return period of the sewer assets could be re-evaluated and the design criteria for sewer system should be newly suggested, considering the temporal change in sewer service capabilities under climate change.

마르코프 연쇄 모델을 이용한 하수관로의 구조적 노후도 추정

강병준,유순유,장전리,박규홍 대한토목학회 2023 대한토목학회논문집 Vol.43 No.4

Sewer deterioration models can offer important information on prediction of future condition of the asset to decision makers in their implementing sewer pipe networks management program. In this study, Markov chain model was used to estimate sewer deterioration trend based on the historical structural condition assessment data obtained by CCTV inspection. The data used in this study were limited to Hume pipe with diameter of 450 mm and 600 mm in three sub-catchment areas in city A, which were collected by CCTV inspection projects performed in 1998-1999 and 2010-2011. As a result, it was found that sewers in sub-catchment area EM have deteriorated faster than those in other two sub-catchments. Various main defects were to generate in 29% of 450 mm sewers and 38% of 600 mm in 35 years after the installation, while serious failure in 62% of 450 mm sewers and 74% of 600 mm in 100 years after the installation in sub-catchment area EM. In sub-catchment area SN, main defects were to generate in 26% of 450 mm sewers and 35% of 600 mm in 35 years after the installation, while in sub-catchment area HK main defects were to generate in 27% of 450 mm sewers and 37% of 600 mm in 35 years after the installation. Larger sewer pipes of 600 mm were found to deteriorate faster than smaller sewer pipes of 450 mm by about 12 years. Assuming that the percentage of main defects generation could be set as 40% to estimate the life expectancy of the sewers, it was estimated as 60 years in sub-catchment area SN, 42 years in sub-catchment area EM, 59 years in sub-catchment area HK for 450 mm sewer pipes, respectively. For 600 mm sewer pipes, on the other hand, it was estimated as 43 years, 34 years, 39 years in sub-catchment areas SN, EM, and HK, respectively. 하수관로 열화모델은 하수관망을 관리하는 의사결정자에게 자산의 미래 상태 예측에 대한 중요한 정보를 제공할 수 있다. 본 연구에서는 CCTV 조사를 통해서 확보한 구조적 상태평가 이력자료를 기반으로 마르코프 연쇄 모델을 이용하여 하수관로의 노후도를 추정하였다. A시의 3개 배수분구에서 1998-1999년과 2010-2011년에 CCTV 조사에 의해 수집된 관경 450 mm와 600 mm의 흄관 자료를 이용하여 분석하였다. EM 배수분구의 450 mm 관로와 600 mm 관로에서 주요 결함 발생이 다른 두 배수분구보다 빠르게 발생하는 것으로 나타났다. 관로 설치 이후 35년이 지난 시점에는 450 mm 관로의 약 29%, 600 mm 관로의 약 38%가 주요 결함이 발생했으며, 100년 후에는 각각 62%와 74%의 관로가 주요 결함으로 관로 기능을 상실하는 수준으로 나타났다. 관로설치 35년 후, SN 배수분구는 450 mm 관로의 약 26%, 600 mm 관로에서 약 35%, HK 배수분구에서는 450 mm 관로의 약 27%, 600 mm 관로에서 약 37%의 주요 결함이 발생한 것으로 예측되었다. 또한 600 mm 관로가 450 mm 관로보다 평균 12년 정도 빨리 기능 저하가 일어나는 것으로 나타났다. 한편, 관로의 주요 결함등급 비율을 40%로 설정하여 관로의 유효사용수명으로 적용할 경우, 450 mm 관로는 SN배수분구에서 60년, EM배수분구에서 42년, HK배수분구 59년이며, 600 mm 관로에서는 각각 43년, 34년 39년으로 나타났다.

관로내 하수흐름의 전단응력 향상을 위한 저수조의 활용에 관한 수리적 고찰

박규홍,유순유,이태훈 대한상하수도학회 2019 상하수도학회지 Vol.33 No.2

If sewage flows for an extended time at low velocities, solids may be deposited in the sewer. Sufficient velocity or tractive force should be developed regularly to flush out any solids that may have been deposited during low flow periods. This study aims to evaluate the periods (T) during which sewage flow greater than the minimum tractive force maintains on a spot in sewer pipe system with lower tractive force or lower velocity than expected in the design step, when a storage tank installed in a place upsteam pours water into the sewer. The effect to T of design factors of storage tank and sewer pipes was evaluated assuming the uniform flow in sewers. When the area of orifice in the storage tank is 0.062 ㎡(or 0.28 m diameter), the maximum T of 31sec was maintained using the usually used preset range of values of several design factors. As the horizontal cross section of storage tank and water depth of storage tank and roughness in sewers increase, T linearly increases. Also, T linearly decreases as the diameter of a sewer pipe increases. Although T gradually decreases as the sewer pipe slope decreases to around 0.005, T decreases sharply when the slope is less than 0.003.

기후변화에 따른 주요 도시의 연간 최소 확률강우량 추정

박규홍,유순유,뱜바도지엘베자르갈 대한상하수도학회 2016 상하수도학회지 Vol.30 No.1

On account of the increase in water demand and climate change, droughts are in great concern for water resources planning and management. In this study, rainfall characteristics with stationary and non-stationary perspectives were analyzed using Weibull distribution model with 40-year records of annual minimum rainfall depth collected in major cities of Korea. As a result, the non-stationary minimum probable rainfall was expected to decrease, compared with the stationary probable rainfall. The reliability of ξ1, a variable reflecting the decrease of the minimum rainfall depth due to climate change, in Wonju, Daegu, and Busan was over 90%, indicating the probability that the minimal rainfall depths in those city decrease is high.