• 제목/요약/키워드: Road Environment

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간선도로에서 MFFn 산정 시 SWMM의 적용성 평가 (The Applicability for Estimating MFFn by SWMM in The Trunk Road)

  • 권헌각;이재운;이윤정;윤영삼;이춘식;이재관
    • 한국물환경학회지
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    • 제27권5호
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    • pp.605-616
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    • 2011
  • The first flush phenomenon and the Mass First Flush (MFFn) were analyzed for various rainy events in trunk road. Applicability for estimate MFFn using SWMM was evaluated by comparision with observed MFFn. First flush phenomenon was investigated by normalized cumulated (NCL) curve of every pollutant based on ten times of rainfall events monitoring data from 2008 to 2009. As a result, magnitude of first flush phenomenon varied with the pollutants and rainfall events. First flush phenomenon was detected highly in the trunk road. MFFn was estimated by varying n-value from 10 to 90% on the rainfall events. The n-value increases, MFFn is closed to '1'. As time passed, the rainfall runoff was getting similar to ratio of pollutants accumulation. The result of a measure of the strength of the linear relationship between observed data and expected data under model was good ($R^2$=0.956). As the final outcome, we have good reliability, estimation and application of MFFn using model seem statistically possible.

GIS 데이터를 이용한 차량 시뮬레이터용 도로 구축에 관한 연구 (Construction of Roads for Vehicle Simulator Using GIS Map)

  • 임형은;성원석;황원걸;주승원
    • 한국정밀공학회지
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    • 제21권4호
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    • pp.88-94
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    • 2004
  • Recently, vehicle simulators are widely used to evaluate driver's responses and driver assistance systems. It needs much effort to construct the virtual driving environment for a vehicle simulator. In this study, it is described how to make effectively the roads and the driving environment for a vehicle simulator. The GIS (Geographic Information System) is used to construct the roads and the environment effectively. Because the GIS is the integrated system of geographical data, it contains useful data to make virtual driving environment. First, the outline and centerline of roads is abstracted from the GIS. From the road outline, the road width is calculated. Using the centerline, the grid model of roads is constructed. The final graphic model of roads is constructed by mapping road image to the grid model according to the number of lanes and the kind of surface. Data of buildings from the GIS are abstracted. Each shape and height of buildings is determined according to kind of buildings, the final graphic model of buildings is constructed. Then, the graphic model of roadside tree is also constructed. Finally, the driving environment for driving simulator is constructed by converting the three graphic models with the graphic format of Direct-X and by joining the three graphic models.

배출량 산정방법에 따른 지자체 도로수송부문의 온실가스 배출량 산정 비교 (Comparison of Greenhouse Gas Emissions from Road Transportation of Local Government by Calculation Methods)

  • 김기동;고현기;이태정;김동술
    • 한국대기환경학회지
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    • 제27권4호
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    • pp.405-415
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    • 2011
  • The objective of this study was to compare greenhouse gas emissions from road transportation by calculation methods (Tier 1, Teir 2, and Tier 3). Tier 1 based on 2006 IPCC guidelines default emission factor and amount of fuel consumption. The Tier 2 approach is the same as Tier 1 except that country-specific carbon contents of the fuel sold in road transport are used. Tier 2 based on emission factor of guidelines for local government greenhouse gas inventories (Korea Environment Corporation), the fuel consumption per one vehicle, and the registered motor vehicles. The Tier 3 approach requires detailed, country-specific data to generate activity-based emission factors for vehicle subcategories (National Institute of Environmental Research) and may involve national models. Tier 3 calculates emissions by multiplying emission factors by vehicle activity levels (e.g., VKT) for each vehicle subcategory and possible road type. VKT was estimated by using GIS road map and traffic volume of the section. The GHG average emission rate by the Tier 1 was 728,857 $tonCO_2eq$/yr, while Tier 2 and Tier 3 were 864,757 $tonCO_2eq$/yr and 661,710 $tonCO_2eq$/yr, respectively. Tier 3 was underestimated by 10.1 and 20.7 percent for the GHG emission observed by Tier 1 and Tier 2, respectively. Based on this study, we conclude that Tier 2 is reasonable GHG emissions than Tier 1 or Tier 3. But, further study is still needed to accurate GHG emission from Tier 3 method by expanding the traffic survey area and developing the model of local road traffic.

도로 소음 저감을 위한 능동소음제어 시스템의 개발 및 기초실험 (Development and Basic Experiment of Active Noise Control System for Reduction of Road Noise)

  • 문학룡;강원평;임유진
    • 한국도로학회논문집
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    • 제15권6호
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    • pp.41-47
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    • 2013
  • PURPOSES : The purpose of this study is about noise which is generated from roads and is consist of irregular frequency variation from low frequency to various band. The existing methods of noise reduction are sound barrier that uses insulation material and absorbing material or have applied passive technology of noise reduction by devices. The total frequency band is needed to apply active noise control. METHODS : In this study applies to the field of road traffic environment, signal processing controller and various analog signal input/output, the amplifier module is based on parallel-core embedded processor designed. DSP performs the control algorithm of the road traffic noise. Noise sources in the open space performance of evaluation were applied. In this study, controller of active signal processor was designed based on the module of audio input/output and main controller of embedded process. The controller of active signal processor operates noise reduction algorithm and performance tests of noise reduction in inside and outside environment were executed. RESULTS : The signal processing controller with OMAP-L137 parallel-core processors as the center, DSP processors in the active control operations dealt with quickly. To maximize the operation speed of an object and ARM processor is external function keys and display for functions and evaluating the performance management system was designed for the purpose of the interface. Therefore the reduction of road traffic noise has established an electronic controller-based noise reduction. CONCLUSIONS : It is shown that noise reduction is effective in the case of pour tonal sound and complex tonal sound below 500Hz by appling to Fx-LMS.

인접도로의 유형에 따른 공동주택 주거단지의 도로교통소음 전달영향 및 평가 (A Study on the Prediction and Evaluation of Road Traffic Noise at the Apartment Housing Complex depending on the Types of Adjacent Roads)

  • 백건종;장길수;백은선
    • KIEAE Journal
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    • 제9권1호
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    • pp.61-68
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    • 2009
  • In this study, computer simulation program was using to identify the effects of road traffic noise propagation depending on the road types which are very variable in dense city. To achieve this goal, the roads should adjacent to housing complex were categorized into 7 types and propagation noise level should predicted then after simulation of noise exposure population calculation are carried out. Followings the results. First, the road types producing the higher noise level are R1, R2, R3 and R7. The lowest one is R6. And R4, R5 showed that some amount of noise level reduction. Second. the R6 road type which is tunnel shaped showed the highest noise level reduction in vertical distance gap. Last, the order of noise exposure population ratio is R1>R2>R7 and R6 showed the lowest.

도로경관의 자연환경성 모형 -교외지역 국도를 중심으로- (A Model of Environmental Naturalness for Roadscape - Focused on the National Road in Suburb Areas -)

  • 홍영록;권상준;조태동
    • 한국환경과학회지
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    • 제13권6호
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    • pp.505-512
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    • 2004
  • This study was attempted to review the information data for minimizing the destruction of environmental naturalness and the visual damage of landscape from road construction by establishing a model of environmental naturalness for national roads in the suburb areas to suggest an answer to a research question, ' hat does decide the environmental naturalness of roadscape?'. We found that 1) The road-side slope showed no statistical significance in the description of environmental naturalness of roadscape, but the fact that the road-side slope from road construction is the destruction of natural topography cannot be overlooked. 2) In terms of the direction of value variations for independent variables, signboard and telegraph post, soundproofing and protection wall, structure, and building acted toward negative (-) direction, while mountains, sky, road trees, fields, and surrounding green including the road-side slope acted toward positive(+) direction. 3) The variable with highest relative contribution to dependent variables among independent variables is building, which has importance as many as 148 times of road-side slope, while the variable road-side slope has the least importance. Building has the importance of 7.22 times, mountains 5.51 times, road trees 2.59 times, surrounding green 2.54 times, structure 2.41 times, signboard and telegraph post 2.37 times, soundproofing and protection wall 2.20 times, and sky 1.32 times of the fields as a standard criterion values 1.

소음지도 작성을 위한 도로교통소음 예측식의 적합성 연구 (A Study on the Fitness of Road Traffic Noise Formulas for Noisemap)

  • 김화일
    • 한국환경과학회지
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    • 제16권7호
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    • pp.823-830
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    • 2007
  • Traffic noise is a kind of noise caused by cars, trains and aircraft. Among them, noise produced by cars is the most important factor in cities. According to the National Institute of Environmental Research(NIER)'s survey, Road traffic noise levels in Susan are the highest of all the cities in Korea. So, appropriate measures for road traffic noise reduction is required. For this purpose, the construction of a noise map in Susan will playa vital role. However, road traffic noise formulas are constructed considering regional characteristics such as each country road's environment and vehicle quality. Therefore, prior to constructing a noise map in Susan, examination processes about each formula constituent status and estimation process are required preferentially. In this research, the basic first stage is to estimate Susan's road traffic noise. First, investigate characteristics of each road traffic noise estimate and using this, a noise map is constructed for road traffic noise in Susan. Then the adaptation of a road traffic noise formula is evaluated.

도로기상차량으로 관측한 노면온도자료를 이용한 도로살얼음 취약 구간 산정 (Estimation of Road Sections Vulnerable to Black Ice Using Road Surface Temperatures Obtained by a Mobile Road Weather Observation Vehicle)

  • 박문수;강민수;김상헌;정현채;장성빈;유동길;류성현
    • 대기
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    • 제31권5호
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    • pp.525-537
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    • 2021
  • Black ices on road surfaces in winter tend to cause severe and terrible accidents. It is very difficult to detect black ice events in advance due to their localities as well as sensitivities to surface and upper meteorological variables. This study develops a methodology to detect the road sections vulnerable to black ice with the use of road surface temperature data obtained from a mobile road weather observation vehicle. The 7 experiments were conducted on the route from Nam-Wonju IC to Nam-Andong IC (132.5 km) on the Jungang Expressway during the period from December 2020 to February 2021. Firstly, temporal road surface temperature data were converted to the spatial data with a 50 m resolution. Then, the spatial road surface temperature was normalized with zero mean and one standard deviation using a simple normalization, a linear de-trend and normalization, and a low-pass filter and normalization. The resulting road thermal map was calculated in terms of road surface temperature differences. A road ice index was suggested using the normalized road temperatures and their horizontal differences. Road sections vulnerable to black ice were derived from road ice indices and verified with respect to road geometry and sky view, etc. It was found that black ice could occur not only over bridges, but also roads with a low sky view factor. These results are expected to be applicable to the alarm service for black ice to drivers.

도로청소에 의한 비점오염부하 삭감량 산정방법 연구 (A Study on Estimating Diffuse Pollution Loads Removal by Road Vacuum Cleaning)

  • 이태환;조홍래;정의상;구본경;박배경;김용석
    • 한국물환경학회지
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    • 제33권2호
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    • pp.123-129
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    • 2017
  • The purpose of this study is to identify potential methodologies to reasonably estimate the effectiveness of road vacuum cleaning in terms of pollution loads reduction. In this context, this study proposes two empirical equations to estimate the amount of diffuse pollution loads removed by road vacuum cleaning. The proposed equations estimate the removed amount of pollution loads respectively taking into consideration of: a) the distance of road vacuum cleaning; and b) the amount of road-deposited sediment(RDS). All of the parameters in these equations were evaluated based on results of field monitoring and laboratory analyses, except for the RDS generation rate. The results of this study suggest that pollutant removal efficiency is 46.3% for $BOD_5$ and 56.4% for TP; discharge ratios for particulate and dissolved $BOD_5$ are 35.0% and 21.2%, respectively; discharge ratios for particulate and dissolved TP are 35.0% and 19.4%, respectively. Average concentrations of pollutants in RDS are $BOD_5$ 977.3 mg/kg and TP 317.6 mg/kg. Some results of a case study imply that both equations can be potentially useful if the adopted parameters are reasonably evaluated. In particular, the RDS generation rate should be evaluated based on monitoring data collected from various road conditions.

도시 환경에서 도로 차량 밀도 정보를 기반으로 하는 VANET 라우팅 프로토콜 (A VANET Routing Protocol based on the Road Vehicle Density Information in the City Environment)

  • 유현;안상현
    • 정보처리학회논문지:컴퓨터 및 통신 시스템
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    • 제2권6호
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    • pp.253-256
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    • 2013
  • VANET에서는 차량 안전 관련 정보가 차량들 간에 안정적으로 전달될 수 있도록 해주는 라우팅 프로토콜이 요구된다. 본 논문에서는 도시기반의 VANET 환경에서 차량 간의 빠르고 안정적인 통신을 위하여 차량 밀도 정보를 이용한 라우팅 기법을 제안한다. 제안 기법에서 각 차량은 비콘 메시지와 도로 정보을 이용해서 도로의 차량 밀도를 계산한다. 차량들은 이 정보를 이용해서 패킷을 전송할 안정적인 경로를 설정한다. NS-2 시뮬레이션을 통해 제안 기법과 GPSR의 성능을 비교했으며, 그 결과 제안 기법이 패킷 전송 성공률 측면에서 우수한 성능을 보임을 알 수 있었다.