침투형 우수유출 저감시설의 저감효과 개선에 관한 실험 연구 : 누가침투량 분석에 의한 침투-저류시스템 제안

임장혁(Im Janghyuk),송재우(Song Jaiwoo),박영진(Park Youngjin) 한국지반환경공학회 2009 한국지반환경공학회논문집 Vol.10 No.4

최근 지속적이고 건전한 물 관리를 위하여 침투형 우수유출 저감시설이 고려되고 있는 실정이다. 그러나 침투형 우수유출 저감시설의 실제 적용에는 많은 문제점에 대한 개선이 필요하다. 본 연구에서는 침투형 우수유출 저감시설에 대한 개선 방법으로 침투-저류 시스템(ISS)을 제안하고, 수리모형 실험에 의해 우수유출 저감효과를 분석하였다. 본 연구에서 새로 제안된 우수유출 저감시설의 침투 특성을 분석하기 위해 다양한 강우 조건과 택지 개발 및 도시화를 고려하기 위해 실제 택지 개발시 이용되는 표면재료를 적용하였다. 본 연구에서는 수리모형 실험결과에 따라, 하부층의 누가 침투량에 의해서 침투-저류 시스템(ISS)은 부가적인 저감효과를 나타냈으며, 강우강도가 증가함에 따라 누가 침투율도 증가하였다. 그러므로 침투-저류 시스템(ISS)은 침투율이 증가하므로 기존 우수유출 저감시설보다 더 효과적으로 나타났다. 이러한 결과는 침투-저류 시스템(ISS)의 우수유출저감시설로써 적용에 대한 타당성을 확보할 수 있으며, 향후 관련 연구가 수행되면 침투-저류시스템(ISS)은 실제 우수유출 저감시설로써 활용될 수 있을 것이다. The runoff-reducing facilities using infiltration was considered for the sustainable and sound water management. However, for practical utilization, many problems are attended and therefore effort on improvements are required. In this study, methods of improvement for infiltration facilities proposed by Infiltration-Storage System (ISS) and the effect of runoff reduction were analyzed by hydraulic experimental study. In order to analyze the infiltration characteristics of proposed runoff reduction facilities in this study, it was applied to various rainfall condition and surface material considering development and urbanization influences. As a results of hydraulic model experiment, Infiltration-Storage System (ISS) made addition to effect of reduction by lower layer of accumulative infiltration quantities. And then as rainfall-intensity was increased, accumulative infiltration rates were increased in this study. Thus, Infiltration-Storage system (ISS) was more efficient than existing runoff reduction facilities because of increasing infiltration rate. Such a result was guaranteed application of ISS as runoff-reducing facilities. Therefore, ISS is expected to be capable for practical application if subsequent research for improvements are followed. Additionally, results of this study are expected to provide fundamental research data on infiltration facilities.

경사 위어의 유량 특성에 관한 실험 연구

진신욱(Jin SinWook),임장혁(Im JangHyuk),박성식(Park SungSik),송재우(Song JaiWoo) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

원형교각 주위의 원환 설치에 따른 하천흐름의 특성변화

宋在偶,陳炳湖,심우배 弘益大學校 科學技術硏究所 2003 科學技術硏究論文集 Vol.14 No.-

In this study, hydraulic characteristics around bridge piers were analyzed with and without collar through a hydraulic model experiment. The analysis of stage variation in front and back side of pier showed that collar installation did not function as obstacle to the stream flow. Little variation of water level between front and back sides of pier was observed before and after collar installation(0.2cm in front side and 0.1cm in back side of pier). Also, There was not a significant difference of lateral and transfers velocities before and after the collar installation. About 16.72% and 15.83% of vertical velocities were reduced for the condition of in the front side of pier and in the back side of pier, respectively. This experimental results suggest that the collar installation around pier can minimize the local scouring depth by preventing the downflow that cause the pier scour.

표면재료 및 강우강도에 따른 우수유출저감시설의 침투 특성에 관한 실험 연구

宋在偶,任壯爀,鄭祐昌 홍익대학교 과학기술연구소 2006 科學技術硏究論文集 Vol.17 No.-

The increment of impermeable land area due to widespread land development caused the adverse impact on urban disaster prevention because it could decrease the peak rate of runoff as well as increase the runoff and peak flow during rainy period. Many researchers have focused on the facilities that can reduce this increased runoff. Recently, runoff-reducing facilities using infiltration have drawn much attention because of their cost-effectiveness and high performance. To date, however, little research has been conducted on the infiltration characteristics and quantitative analysis because of their highly dependence on construction method, paving material, surface permeability, and field condition. Hence, this study was performed to investigate the infiltration characteristics of runoff-reducing facilities according to the type of paving material, which were examined using experimental apparatus with varying paving material and rainfall intensity, and thus to provide fundamental research data for runoff-reducing infiltration facilities. In this study, the infiltration characteristics were examined under the rainfall intensity of 20, 30, 50, 80, 100, 200 mm/hr for a variety type of paving materials such as concrete, asphalt, sand, grassland, and permeable paving material. The infiltration rate for permeable paving material was observed to be more than 93 % under the condition of less than 200 mm/hr of rainfall intensity. For the compacted earth and grassland, the ultimate infiltration rate was estimated to be about 13% to 67%. The asphalt and concrete paving materials showed the direct runoff pattern with extremely low ultimate infiltration rate. The permeable paving material was concluded to be the most appropriate one for the runoff-reducing infiltration facilities because it has more favorable advantages than others in the light of infiltration volume, disaster prevention, and river training.

식생수로에서 식생밀도에 따른 흐름특성

宋在偶,朴晟植,勸度炫 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-

In these days, it could be considered that the vegetation plays important roles of the stabilization of channel bed, as well as of habitats and feed for fauna. So, it has been studied important concern and study subjects that turbulent structure by vegetation, shear stress and transport as well as roughness and average velocity by vegetation. But From a hydraulic point of view, vegetation causes resistance to the flow and can increase the risk of flooding. Therefore, the purpose of this study is to investigate the flow characteristics due to vegetation densities in vegetated open channels through hydraulic model experiments. The velocity is logarithmically distributed from the upper part of vegetation to 0.8 of flow depth(h_(over)) over the vegetation deflected by the flow. The elevation(z_(0)) corresponding to zero velocity is calculated by using measured velocity profiles. In a vegetated open channel, z_(0) is 0.40 of mean height(h_(p)) of deflected vegetation. The roughness height is calculated by using velocity profiles and it is shown that the flow resistance tends to increase with the density of vegetation. The velocity profiles measured in a vegetated open channel is a relatively good agreement with those predicted from formulae proposed by Kouwen et al.(1969), Haber(1982) and El-Hakim et al.(1992).

Random Walk 모형을 이용한 비균질 다공성 매질에서의 지하수 흐름과 용질이동에 대한 수치적 연구

宋在偶,鄭祐昌,李治憲 弘益大學校 科學技術硏究所 2002 科學技術硏究論文集 Vol.13 No.-

Groundwater pollution can be expected as a necessary result of allowing for nonsystematic groundwater exploitation and management. This problem is confirmed by reports and press releases. It is important that we understand the moving routes of pollutants because the effects of polluted groundwater last longer than surface water's effects. This study uses TBM(Turning Bands Method), a geostatistical method for generating spatiallycorrelated hydraulic conductivity and distribution coefficient's random distribution, calculates hydraulic head distribution for observing solute transport in the subsurface using Galerkin Finite Element Method, and calculates velocity distribution in each element from hydraulic head distribution. To solve the advection-dispersion-sorption equation numerically, this study uses the random walk particle tracking method that solves the equation by the large number of particles which are moved by dispersion and local velocity which is changed with space and time. In order to observe the effects of correlation on hydraulic conductivity and distribution coefficient, this study carried out numerical simulation by giving a variety of which expresses correlation. The results show that longitudinal spatial moments in the positive correlation case are larger than the negative correlation case. This is caused by high hydraulic conductivity combined with high distribution coefficient in the positive correlation case, so the longitudinal spatial moment is larger than the negative correlation case. In order to observe solute transport's alteration, this study carried out numerical simulation by giving a variety of hydraulic conductivity's correlation length,. The results show that longitudinal mass-center-displacement in the case of=15.0m is larger than the case of=5.0m. This is caused by a high correlation effect, so solute transport is enhanced, longitudinal mass-center-displacement and longitudinal spatial moment are enlarged.