• Title, Summary, Keyword: Urban water cycle

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An Assessment of Urban Water Cycle in Changwon-si Using GIS-based Water Cycle Area Ratio (GIS 기반의 물순환 면적률을 활용한 창원시 도심지역의 물순환성 평가)

  • Song, Bonggeun;Park, Kyunghun;Lee, Taeksoon
    • Journal of Environmental Impact Assessment
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    • v.22 no.5
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    • pp.397-408
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    • 2013
  • The purpose of this study is to analyze water cycle area ratio and spatial evaluation of water cycle in urban area of Changwon-si, Gyeongsangnam-do. Water cycle area ratio are analyzed by using spatial data of land-cover and land-use, and Hot spot analysis of GIS program was used for spatial evaluation of water cycle. The results are as below. Firstly, the high water cycle area ratio areas were forests, parks, and rivers, but urban areas covered asphalt and concrete were low under 40%. Public institutions and co-residential of urban areas were higher than others because of high area ratio of pervious land-cover. Spatial evaluation of water cycle was analyzed to vulnerable areas there are dense residential and commercial area. These areas are really occurring frequently flooding and immersion, therefore, is required water management facilities and improvement of land-cover from impervious to pervious. In the future, it will require additionally analysis of water cycle area ratio supplemented data of water management facility and ground water.

Assessing the Effect of Water and Heat Cycle of Green Roof System using Distributed Hydrological Model in Urban Area (분포형 수문모형을 이용한 도시지역 옥상녹화에 따른 물 및 열순환 영향 평가)

  • Jang, Cheol Hee;Kim, Hyeon Jun;Kim, Yeon Mee;Nam, Mi A
    • KIEAE Journal
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    • v.13 no.4
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    • pp.33-41
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    • 2013
  • The impervious area on the surface of urban area has been increased as buildings and artificial land cover have continually been increased. Urban development has gradually decreased the green zone in downtown and alienated the city from the natural environment on outskirt area devastating the natural ecosystem. There arise the environmental problems to urban area including urban heat island phenomenon, urban flood, air pollution and urban desertification. As one of urban plans to solve such problems, green roof system is attracting attentions. The purpose of this study was to investigate flood discharge and heat reduction effect according to the green roof system and to quantify effect by analyzing through simulation water and heat cycle before and after green roof system. For the analysis, Distributed hydrologic model, WEP (Water and Energy transfer Processes) and WEP+ model were used. WEP was developed by Dr. Jia, the Public Works Research Institute in Japan (Jia et al., 2005), which can simulate water and heat cycle of an urban area with complex land uses including calculation of spatial and temporal distributions of water and heat cycle components. The WEP+ is a visualization and analysis system for the WEP model developed by Korea Institute of Construction Technology (KICT).

Analysis for water cycle change using SWAT model and water balance analysis depending on water reuse in urban area (SWAT모델과 물수지분석을 이용한 물재이용에 의한 도시물순환 변화 분석)

  • Kim, Young-Ran;Hwang, Seong-Hwan;Lee, Sung-Ok
    • Journal of Korean Society of Water and Wastewater
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    • v.29 no.4
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    • pp.447-457
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    • 2015
  • Water cycle within the human civilization has become important with urbanization. To date, water cycle in the eco-system has been the focus in identifying the degree of water cycle in cities, but in practicality, water cycle within the human civilization system is taking on an increasing importance. While in recent years plans to reuse water have been implemented to restore water cycle in cities, the effect that such reuse has on the entire water cycle system has not been analyzed. The analysis on the effect that water reuse has on urban areas needs to be go beyond measuring the cost-savings and look at the changes brought about in the entire city's water cycle system. This study uses a SWAT model and water balance analysis to review the effects that water reuse has on changes occurring in the urban water cycle system by linking the water cycle within the eco-system with that within the human civilization system. The SWAT model to calculate the components of water cycle in the human civilization system showed that similar to measured data, the daily changes and accumulative data can be simulated. When the amount of water reuse increases in urban areas, the surface outflow, amount of sewer discharge and the discharged amount from sewage treatment plants decrease, leading to a change in water cycle within our human civilization system. The determinant coefficients for reduced surface outflow amount and reduced sewer discharge were 0.9164 and 0.9892, respectively, while the determinant coefficient for reduced discharge of sewage treatment plants was 0.9988. This indicates that with an increase in water reuse, surface flow, sewage and discharge from sewage treatment plants all saw a linear reduction.

Hydrologic Cycle Simulation of Urban River for Rehabilitation of Water Environment (II) - Dorimcheon Basin - (물 환경 건전화를 위한 도시하천의 물 순환 모의 (II) - 도림천 유역 -)

  • Lee, Sang-Ho;Lee, Jung-Min
    • Journal of Korean Society on Water Environment
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    • v.22 no.5
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    • pp.815-823
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    • 2006
  • The hydrologic cycle in urban catchment has been changed due to the expansion of impervious area by rapid urban development. In this study, the SWMM 5 (Storm Water Management Model 5) model was used to simulate the hydrologic cycle of the Dorimcheon catchment which suffers from the distorted hydrologic cycle as a typical urban catchment. This study compare continuous simulation of urban runoff combining the channel and sewer system with that of channel only in the Dorimcheon catchment. Continuous simulations of urban runoff were performed for the upstream basin of Dorim bridge. The urban impervious regions were processed by the land use analysis from LANDSAT_TM images. It was performed from 1975 to 2000 for every five years. Surface, groundwater and wastewater runoffs were additionally included in the simulations one at a time. Such simulations made it possible to evaluate those components quantitatively. The result of continuous simulation of urban runoff combining the channel and sewer system is that peak flow and recession are well simulated. The analysis results of urbanization effect on runoff are as follows: the surface runoff in 2000 increases to 64% of the whole precipitation whereas the surface runoff in 1975 amounts to 46% of the precipitation; the groundwater runoff in 2000 amounts to 6% and shows 8% decrease during the period from 1975 to 2000.

Hydrologic Cycle Simulation of Urban river for Rehabilitation of Water Environment (I) - Anyangcheon Basin - (물 환경 건전화를 위한 도시하천의 물 순환 모의 (I) - 안양천 유역 -)

  • Lee, Jung-Min;Lee, Sang-Ho;Lee, Kil-Seong
    • Journal of Korean Society on Water Environment
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    • v.22 no.2
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    • pp.349-357
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    • 2006
  • Nowadays, the discharges of urban streams during dry season are depleted because the hydrologic cycle in the watershed has been destroyed due to the expansion of the impermeable area, the excessive groundwater pumping, climate change, and so forth. The streamflow depletion may bring out severe water quality problems. This research are to investigate the hydrologic characteristics and to develop a technology to restore sound hydrologic cycle of Anyangcheon watershed. For the hydrological cycle analysis of the Anyangcheon watershed, continuous simulations of urban runoff were performed for the upstream basin of Gocheok bridge whose basin area covered 4/5 of the whole catchment area. The increase of impervious area by urbanization was analysed and its effect on urban runoff was evaluated. The SWMM 5 (Storm Water Management Model 5) was used for the continuous simulation of urban runoff. The analysis results of urbanization effect on runoff are as follows: the surface runoff in 2000 increases to 65% of the whole precipitation whereas the surface runoff in 1975 amounts to 50% of the precipitation; the groundwater runoff in 2000 amounts to 7% and shows 6% decrease during the period from 1975 to 2000.

Analysis of Urban Water Cycle Considering Water Reuse Option (물재이용을 고려한 도시지역의 물순환 해석)

  • Lee, Ji-Ho;Pak, Ki-Jung;Yun, Jae-Young;Yoo, Chul-Sang
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.1925-1928
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    • 2007
  • Water cycle analysis was performed for Gunja basin located in metropolitan Seoul using Aquacycle model in order to assess the problems of urban water cycle. From the water cycle analysis of Gunja basin, it was found that 75% of total rainfall occurred in the form of surface runoff, and groundwater recharge only accounted for about 7%. This suggests serious distortion of water cycle which can be attributed to urbanization. Feasibility analysis of reuse scenarios such as rainwater use and wastewater reuse was then performed to examine their influences on improving the water cycle. From the analysis of water reuse options, it was shown that imported water supply savings of 13% can be achieved through rainwater use, and water supply savings of 31% through wastewater reuse.

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The Urban Water Cycle Planning Elements and Hydrologic Cycle Simulation for Green City (녹색도시 물순환 계획요소 및 수문순환 모의)

  • Lee, Jung-Min;Kim, Jong-Lim
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.3 no.3
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    • pp.271-278
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    • 2012
  • The climate change and global warming has been a world-wide issue. Also, the green growth has been a widely adopted strategy for national and regional development. In particular, after the Kyoto Protocol to United Nations Framework Convention on Climate Change was declared, the low carbon society was inevitable phenomenon. The hydrologic cycle in urban catchment has been changed due to the expansion of impervious area by rapid urban development. This paper has examined the Water cycle planning elements for green city in the scale of urban planning as well as site planning including housing site. In this study, the SWMM5-LID (Storm Water Management Model5-LID) model was used to simulate the hydrologic cycle of the test catchment as a typical urban catchment. We performed continuous simulation on urban runoff before and after the development of the test catchment and after the installation of Green city planning Elements.

Establishment of Life Cycle Management(LCM) System for Water Supply and Sewerage Systems (상하수도시설에 대한 전과정관리(LCM)시스템 구축방안 연구)

  • Park, Ji-Hyoung;Hwang, Young-Woo;Kim, Young-Woon;Park, Kwang-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.26 no.2
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    • pp.303-312
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    • 2012
  • Water supply and sewerage systems are the large-scale urban infrastructure ejecting large amount of environmental load over the life-cycle. Therefore, it is important not only to optimize in the aspect of economical superiority and process efficiency but also to consider earth scale environmental impact. This study aimed to suggest the establishment of life cycle management(LCM) system as an integrated management solution in urban water supply and sewerage systems. As a result, the methodology for LCM system consisting of life cycle assessment(LCA), life cycle cost(LCC), life cycle $CO_{2}(LCCO_{2})$ and life cycle energy(LCE) was developed. Also, several case studies using the latest statistics data of water supply and sewerage systems were carried out to investigate the field applicability of LCM.

Study on decentralized options of the in-stream flow for restoring the Gyobang cheon: application of the Urban Volume and Quality (UVQ) model to examine feasibilities in water quantity and quality (교방천 복원을 위한 분산형 유지유량 확보 방안 연구 (I): 수량.수질 타당성 검토를 위한 도시 물순환 모형 적용)

  • Shin, Sang-Min;Choi, Go-Eun;Lee, Sang-Eun;Park, Hee-Kyung
    • Journal of Korean Society of Water and Wastewater
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    • v.25 no.5
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    • pp.699-706
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    • 2011
  • This study has a purpose of examining technical feasibility of supplying the in-stream flow for the Gyobang cheon by using treated water from small wastewater treatment facilities as a decentralized option. To do this, the water and contaminant flow in study areas of the Gyobang cheon are defined from the context of the integrated urban water cycle, and analyzed by using the Urban Volume and Quality (UVQ) model. First, the UVQ model was built for the study areas of the Gyobang cheon and calibrated with observation data. Second, the decentralized options of the in-stream flow was explored with consideration of availability of water sources. The UVQ simulation then led to selecting the best option which would meet the criteria of water quantity and quality. It was finally concluded that using water sources out of study areas 1 and 2, adjoining the upper part of the Gyobang cheon, in the decentralized manner can be a feasible option for in-stream flow. It also seems that the UVQ model is useful to understand the water cycle in study areas of the Gyobang cheon.