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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.
박용균,정성균,권혁재 대한상하수도학회 2015 상하수도학회지 Vol.29 No.6
In this study, determination methods of monitoring location in water distribution system were suggested and applied to real test bed. Small block of Gwangtan water distribution system is consisted of 582 pipes, 564 junctions, 1 reservoir, and 1 pump station. Small block of Ho Chi Minh water distribution system is consisted of 162 pipes, 148 junctions, and 1 reservoir. Two small block water distribution systems were analyzed by pressure contribution analysis method to determine the optimum monitoring locations. The pressure change was estimated at each junctions by the additional demand at a junction. From the results, the optimum monitoring location can be determined by rank of pressure contribution index at each junctions due to demand change at a junction.
양상현,나덕관 대한상하수도학회 1987 상하수도학회지 Vol.1 No.-
Experimental studies for the Sewage treatment by activated sludge process added activated carbon and briquette ash were executed, and the obtained results are as follows; 1. As the concentration of activated sludge increases, settling velocity and volume of it obviously decrease and its settling conditions become very poor. 2. Most appropriate sizes of activated carbon and briquette ash added to activated sludge process are 0.1㎜ to 0.15㎜. And each volume of them is about 6g/ℓ. The settling rate of activated sludge increases by the addition of media such as activated carbon or briquette ash, and this tendency is more remarkable when the activated sludge concentration is high. 3. Adding the appropriate particle size and volume of media to activated sludge makes Sewage treatment more effective. Especially, as the media, briquette ash is more economic than activated carbon added to the activated sludge process because the cost of briquette ash is very cheap.