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윤영노,김정수,한정석,윤세의,Yoon. Young-Noh,Kim. Jung-Soo,Han. Chyung-Such,Yoon. Sei-Eui 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
Urban sewer systems are designed to operate in open-channel flow regime and energy loss at circular manholes are usually not significant. However, the energy loss at manholes, often exceeding the friction loss of pipes under surcharge flow, is considered as one of the major causes of inundation in urban area. Therefore, it is necessary to analyze the head loss associated with manholes, especially in surcharge flow. Hydraulic experimental apparatus with two circular manholes was installed for this study. The range of the experimental discharges were from <TEX>$1.0\ell/sec$</TEX> to <TEX>$4.4\ell/sec$</TEX>. Head loss coefficient was maximum because of strong oscillation of water surface when the range of manhole depth ratios<TEX>$(h_m/D_{in})$</TEX> were from 1,2 to 1.25. The average head loss coefficients for upstream manhole and downstream manhole were 0.58 and 0.23 respectively. Head loss at upstream manhole is nearly 2.5 times more than one at downstream manhole.
장석진,윤영노,김정수,윤세의,Jang,Suk-Jin,Yoon,Young-Noh,Kim,Jung-Soo,Yoon,Sei-Eui 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
In storm sewer networks a lot of manholes are installed to maintain and connect a sewer of urban area. There are some shapes of manhole such as circular type, square type, and so on. Square shape manholes are installed to connect the large diameter drainage pipes in general and have lager head losses than circular one. Consequently, it is important to analyze the head losses in square manhole because the head losses in square manhole are much bigger than the friction losses in pipes. Hydraulic experimental apparatus which can be changed the inside shape in square manhole was installed for this study. The experimental discharge was <TEX>$16{\ell}/sec$</TEX>. The head loss coefficients in the manhole were calculated by the experimental results. The range of head loss coefficients in the general square manhole were from 0.33 to 0.48 and the range of head loss coefficients in the square manhole changed inside shape were from 0.23 to 0.28.
김정수,윤영노,김낙석,윤세의,Kim. Jung-Soo,Yoon. Young-Noh,Kim. Nak-Seok,Yoon. Sei-Eui 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
Storm and flood damage management systems in national disaster management system(NDMS) were organized into three operation systems. They are prevention, preparation, response, and recovery systems. Disaster resources in each system must be promptly and exactly applied to minimize casualties and loss of properties. However, the disaster resources in current management system can not be immediately used in calamity situation due to the lack of efficiency in statistical data. Therefore, it is necessary to classify the emergency restoration equipment for efficient management and mobilization of disaster resources in disaster situation. In this study, field survey was executed to appropriately classify the emergency restoration equipment. Problems and reformation points of the disaster resources system were also presented to improve the classification technique and to construct the data base.