도시 소유역 내 내수침수 위험도 평가 : 강우 시간분포 및 이중배수체계 모형을 중심으로

대한상하수도학회 대한상하수도학회 2021 상하수도학회지 Vol.35 No.6

In this study, dual drainage system based runoff model was established for W-drainage area in G-si, and considering the various rainfall characteristics determined using Huff and Mononobe methods, the degree of flooding in the target area was analyzed and the risk was compared and analyzed through the risk matrix method. As a result, the Monobe method compared to the Huff method was analyzed to be suitable analysis for flooding of recent heavy rain, and the validity of the dynamic risk assessment considering the weight of the occurrence probability as the return period was verified through the risk matrix-based analysis. However, since the definition and estimating criteria of the flood risk matrix proposed in this study are based on the return period for extreme rainfall and the depth of flooding according to the results of applying the dual drainage model, there is a limitation in that it is difficult to consider the main factors which are direct impact on inland flooding such as city maintenance and life protection functions. In the future, if various factors affecting inland flood damage are reflected in addition to the amount of flood damage, the flood risk matrix concept proposed in this study can be used as basic information for preparation and prevention of inland flooding, as well as it is judged that it can be considered as a major evaluation item in the selection of the priority management area for sewage maintenance for countermeasures against inland flooding.

대한상하수도학회,한국물환경학회 2005년 공동 추계학술발표회 및 포럼 & 2005 Water Korea

학회자료 대한상하수도학회 2005 상하수도학회지 Vol.19 No.5

보고문 : 미국호수관리학회 및 저수지 현지 답사 출장기 - 미국호수관리학회 ( NALMS ) 임원회의 , BOD meeting , TVA ( Tennessee Valley Authority ) 방문 , LA 저수지 현지 답사기

서동일(Dong Il Seo) 대한상하수도학회 2002 상하수도학회지 Vol.16 No.5

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특집 : 우리나라 도시 상하수도 시스템의 문제점 및 대책 - 낙동강 페놀오염사건을 계기로 - 1991 . 6 < 한국상하수도학회 조사위원회 >

학회자료 대한상하수도학회 1991 상하수도학회지 Vol.4 No.1

회장취임인사 ( Inaugural Message ) ( 대한상하수도학회 , 상하수도학회지 , 제 15 권 4 호 , 2001 년 )

정태학(Tai Hak Chung) 대한상하수도학회 2001 상하수도학회지 Vol.15 No.4

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방류수 재이용을 위한 합성투과 여재 여과

박기영,김기팔,권지향,윤현희,안규홍,맹승규 대한상하수도학회 2005 상하수도학회지 Vol.19 No.1

하수처리장 방류수를 재이용하기 위하여 합성여재를 이용한 새로운 형태의 여과공정에 대하여 연구하였다. 세 가지의 합성 여재를 조사하여 폴리우레탄 여재를 가장 적합한 여재로 선정하였다. 압축성 및 상향 유속을 변경하면서 시스템의 최적조건을 실험하였고, 상향유속과 처리효율의 관계를 지수형의 수식을 이용하여 나타낼 수 있었다. 파일롯 연구에서 압축성 합성 여재를 이용한 여과공정은 통상의 3배의 여과유속과 훨씬 긴 세정주기에도 불구하고 여재막힘 현상을 현저히 줄이면서 안정한 처리수질을 확보할 수 있었다. In the present study a feasibility of a novel filtration process using synthetic for secondary effluent reclamation was investigated. Polyurethane was chosen as filter medium among tested three media. Compressibility and up-flow velocity were changed to determine the optimum operation for the system. An equation was introduced to express the relationship between the removal efficiency and up-flow velocity. In pilot study, the synthetic medium filtration with compression showed very stable effluent quality without clogging trouble, though the system operated with 3 times higher filtration rate and much longer backwashing interval than conventional systems.

UF막 여과 공정의 효과적인 전처리 공정으로 噴流攪拌固液分離槽(Jet Mixed Separator: JMS) 도입 효과에 관한 연구

이상협,장낙용,Yoshimasa Watanabe 대한상하수도학회 2005 상하수도학회지 Vol.19 No.1

In this research, we tried to combine the coagulation/sedimentation process as pre-treatment with UF membrane filtration to reduce the membrane fouling and to improve the permeate water quality. We used the Jet Mixed Separator (JMS) as coagulation/sedimentation process. We observed that the HPC and E.Coli can't be removed through the direct UF memebrane filtation of surface water. The removal efficiency of dissolved organic substances, indicated by E260 and DOC, was 40% and 15%, respectively. However, the removal efficiency of it increased two time as a result of combination of JMS process as coagulation/sedimentation pre-treatment. This was resulted from the formation of high molecular humic micro-floc through JMS process. The accumulation amount of irreversible cake layer which was not removed by backwashing was less than direct UF membrane filtration of surface water. Moreover, the loading rate of fouling induced substances, such as humic substances and suspended substances, on membrane surface decreased drastically through JMS process. As a result, the accumulation amount of irreversible cake on membrane surface was decreased.

누수탐사에 의한 유량분석 및 보수의 경제적 효과

이승철,이상일 대한상하수도학회 2005 상하수도학회지 Vol.19 No.1

Field measurement data on water leakage are not readily available and it causes inaccurate assessment of water demand and poor supply planning. In this study, the procedure for leakage detection and unaccounted water calculation is proposed and applied to a city. The city has suffered from the significant amount of leak water and the financial loss as a result. Measurements were made for pressure and flow at 18 locations before and after the repair. Repair of the leakage increased pressure up to 2.0kgf/cm2 and saved 17.1% of water supply from distribution reservoirs. Monetary value of annual water savings for the entire city amounts to 1 billion won. It is believed that leakage detection and data analysis conducted in this study will contribute to the change of current practice and to the establishment of better water supply management system.

갈뫼중학교 빗물이용시설에서의 저장 빗물수질평가

한무영,이순재 대한상하수도학회 2005 상하수도학회지 Vol.19 No.1

One of the major obstacles confronted in promoting the rainwater harvesting is the concerns of acid rain and heavy metals. Although there are many data concerning the quality of rainwater precipitation for the study of acid rain, the study on the quality of stored rainwater has been limited. In this study, we monitored the quality of stored rainwater at Galmoe middle school, where a rainwater harvesting system is installed and in use for more than two years. We measured water quality parameters such as pH, Electro Conductivity(EC), Dissolved Oxygen(DO), and some metals (aluminium (Al), chromium(Cr), manganese(Mn), zinc(Zn), copper(Cu), arsenic(As), cadmium(Cd), lead(Pb)). The monitoring period was during one year from September 9th 2003 to August 5th 2004. It was observed that the average pH of stored rainwater is neutral. DO is similar to tap water and EC is lower than tap water. Metal Concentrations are within the concentration specified in Drinking Water Quality Standard. Overall, the stored rainwater quality is good enough for sundry use and there's no threat of acid rain and air pollution, if the rainwater harvesting system is well designed and maintained.

2가철 시멘트 수화물에 의한 질산성 질소의 제거

강완협,박주양,박태숙 대한상하수도학회 2005 상하수도학회지 Vol.19 No.1

Ferrous cement hydrates made from hydrating Portland cement doped with Fe(II) were reported to reductively dechlorinate chlorinated organics and to reduce Cr(VI) to Cr(III). In this study, kinetics of nitrate removal by ferrous cement hydrates were investigated. Nitrate removal kinetics were characterized by experimental variables such as cement hydration, amount of cement addition, Fe(II) dose, pH, and by-products. As a result, hydrated cement showed better performances than non-hydrated cement due to the formation of LDH(layered double hydroxide). Doping of Fe(II) into the cement was found to improve removal efficiency at high pHs by association with Fe(II) sorbed on cement hydrates as a reactive reductant. Reduction of nitrate produced ammonium as a major product, which accounted for 63.5% of the final products, and nitrite(0.15%) as a minor product. These results indicate that the developed media are effective as sorbent/reducing agents in the nitrate removal and the reaction mechanisms of nitrate removal are sorption and reduction.