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오재화,문수회,박종민 朝鮮大學校 建設技術硏究所 2005 建設技術硏究 Vol.25 No.1
The primary purpose of the present study is five-fold : ① to review the concept of quality of life and to propose a set of key components and indices of QOL(Quality of Life) in cities, ② to analyze the level of QOL and the discrepancies among cities, ③ to explore the relation ship between the size of the city and the level of QOL, ④ to compare the level of QOL among OECD member counties, ⑤ and to discuss policy issues and directions to improve the QOL in cities. The study divides QOL into physical and non-physical types. Physical QOL is composed of three components: economic aspect, convenience, and locational attributes. Non-physical QOL includes two components of education and culture, health and safety. Under these key component groups, 35 indices were selected to analyze the level of QOL in cities. It was found that between 1997 and 2002, there was no statistically significant improvement of the level of QOL in general and that the gap among cities was not reduced. Finally, the study suggested several macro level policy issues to improve QOL in cities. There is a need to establish the evaluation system of local administration of the performance to improve QOL. It is necessary to develop new comprehensive indices especially for subjective element and non-physical type of QOL and to accumulate internationally compatible database through collaborative research and exchange programs. The role of civil society, private sector should be articulated and micro-level coordinating measures and organizations chancing quality of life should be instituted to better function what has been traditionally performed by the central government.
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김운중,문수회,김영균,민병무 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.1
To estimate the change of riverbed geography by the operation of movable weir, two-dimensional RMA-2 and SED-2D were used in this study. Hydraulic elements like flowrate or depth were simulated by RMA-2 and the change of riverbed geography according to sediment transport was simulated by SED-2D. Suktop stream was chosen as a project river for the simulation. Under the condition of 50-year rainfall frequency, the estimated flood of Suktop was 123cms. At the points of movable weir the simulation results showed that the difference of high water level from the result of HEC-RAS was less than 0.64m. And the difference of water velocity was less than 0.21m/sec. Based on the sediment simulation by SED-2D, predicted riverbed elevation was 29.70-30.22m at the point of ST1 and 28.26~28.82m at the point of ST2. Measured riverbed elevation was 29.70-30.16m, 28.28-28.69m, respectively. So, the predicted elevations are closely similar to the measured elevation. At the point of ST1, sediment transport simulation results showed that erosion of riverbed was predicted by the operation of movable weir. This erosion was ranged up to 200m upstream and the riverbed would be eroded away as much as 0.07m for one year. At the point of ST2, upstream of movable weir would be eroded and the erosion depth was estimated 0.261m. The erosion was higher at the point of movable weir and the erosion depth was estimated 0.310m. But the sediment would be deposit downstream of the movable weir. SED-2D followed by RMA-2 is well applicable to the stream which has movable weirs and can estimate not only hydraulic parameters such as flowrate or depth but also riverbed elevation change caused by erosion or deposit of fluvial sediment.
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김운중,김영균,문수회 朝鮮大學校 建設技術硏究所 2005 建設技術硏究 Vol.25 No.1
The method of a frequency analysis which takes advantage of annual low flow data is extensively used in our country when the design low flow is estimated. It is necessary to secure the measurement record of a long-term in this method and therefore it is not proper to apply this method for cases of measurement record of a short-term or an ungaged outlet. In work-site, generally, the design low flow of unmeasured station is determined by the secondhand method which utilizes the area ratio between the gaging station and the unmeasured station. However, this method using the area ratio is unreal and unreliable because the low flow that is different from the flood flow is affected by the topographical, the geological and the basin characteristics. A new proposal that estimates the design low flow by using the hydraulic-statistical model is made in this paper. A method the return period can be converted into the recession time is derived under an assumption that the dry spell is similar to the low-flow runoffs event. To induce the method(recession time model), two kinds of models are employed; One is the type I extremal value distribution as the dry spell model, and the other is the exponential linear recession equation as the low-flow runoffs model. The climate conditions, the watershed and the runoff characteristics are adopted as the parameters of the recession time model. Meanwhile, a recession model that can estimate the design low flow in the gaging station or the unmeasured station is made by using the results of the recession time model. The initial discharge and the recession constant are used as the parameter of the recession model. The present model derived from this study is applied into the outlet basin of Yongdam gaging station, and the estimated design low flow for the return period of 10 year is obtained as 2.14m3/sec which corresponds to 97% of standard low flow (2.22m3/sec). Resultantlv, it is concluded that the present model proposed in this paper can be effectively used as the alternative for estimation of the design low flow.
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