• Title/Summary/Keyword: urban stream

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Visual Impact Factor and Preference Image of Urban Stream Landscape (도시 소하천 경관의 시각적 선호 이미지와 영향요인)

  • Kim, Dae-Hyun;Kim, Dae-Soo
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.2 no.4
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    • pp.9-15
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    • 1999
  • The purpose of this study was to investigate factors and variables which have significant effects on visual preference of urban stream in Taejon city and to suggest design & management information for urban stream. These works consist of two phases. First, we tested the Hyechon college students' visual preference for 36 spots of urban stream slide and then selected 10 spots slide by the Sturges' formula. Second, we analyzed factors and variables of visual preference of urban stream using the semantic differential scale method and then processed using descriptive analysis, factor analysis and multiple linear regression analysis. The major findings of this study can be summarized as follows. 1. The difference of landscape adjectives between the highest score of visual preference slide (No.10) and the lowest score of visual preference slide (No.2) was cleanness. 2. Three factors, the nature, the cleanness and the movement, were derived from the factor analysis. 3. Factors covering the visual preference of urban stream have been found to be the landscape of urban stream, the nature, the cleanness, and the movement. The visual preference factors of urban stream need to be considered in creating or restoring the ecological urban stream landscape.

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Community Structure of Benthic Macroinvertebrate in the Urban and Nature Stream (도심하천과 자연하천의 저서성 대형무척추동물 군집 구조)

  • Shin, Seok-Min;Choi, Il-Ki;Seo, Eul-Won;Lee, Jong-Eun
    • Journal of Environmental Science International
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    • v.22 no.12
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    • pp.1551-1559
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    • 2013
  • This study was conducted to compare benthic macroinvertebrate communities of urban stream and nature stream in Daegu-si, Gyeongju-si, Gyeongsan-si, Andong-si, and Cheongsong-gun. The survey was carried out with 12 points in total six points for urban stream, six points for nature stream from Sept. 2011 to July 2012. In the urban stream were 33 species belonged to 24 families, 11 orders, 7 classes and 4 phyla while in the nature stream were 73 species belonged to 38 families, 12 orders, 5 classes and 4 phyla. In general, species diversity indices and species richness indices appeared low in urban stream but dominance indices was high. Functional feeding groups and Habitat Oriented Groups appeared comparatively simple in urban stream rather than nature stream. As a result of analysis of community stability, species included to area I and area III equally appeared in nature stream while species included to area I mostly appeared in urban stream. An analysis of the correlation between the population density and the number of species, the population number and biological indicators such as DI, H', RI, and ESB revealed that there was a significant correlativity with the diversity index and a very high correlativity with the number of species, abundance index and the ESB. On the other hand, the population number and the dominance index did not reveal any correlativity. For indicator species, Hydroptila KUa, Physa acuta appeared in urban stream while Paraleptophlebia chocolata, Epeorus pellucidus appeared in nature stream.

The Influence of Urban Stream Investigation on Students' Environmental Conservation Awareness (환경보전의식에 대한 도시하천 조사 활동의 학습 효과)

  • Jeong, Mi-Sun;Sim, Tae-Hoon
    • Hwankyungkyoyuk
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    • v.22 no.2
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    • pp.79-91
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    • 2009
  • The purpose of this study is to find out the influence of the urban stream investigation on elementary school students' environmental conservation awareness. The urban stream investigation was applied to the experimental group and the control group has been taught by the traditional teaching method focused on the teacher's lecture. To analyze the effect of urban stream investigation, the pre- and post-tests on environmental conservation awareness composed of interest in living things, perception about water pollution and environmental conservation were applied to the both groups. The results were analyzed by One-way ANOVA and ANCOVA. As a result, there were not significant difference between the experimental and the control group in the pretest(p>.05). In the post-tests on the student's interest in living things, perception about water pollution and environmental conservation the scores of the experimental group were higher than those of the control group(p<0.05). Therefore, the urban stream investigation made a positive effect on improving of elementary school students' environmental conservation awareness.

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Identifying the Change of Urban Stream Bed Using Real-time Beacon DGPS (실시간 beacon DGPS를 이용한 도시하천의 하상변화 파악)

  • Lee, Kyoo-Seock;Lee, Sang-Hwa;Shin, Dong Hoon;Ahn, Seung-Mahn;Suh, Byung-Key
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.6 no.1
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    • pp.51-56
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    • 2003
  • The urban stream include the channel and its adjacent banks, or hillslopes and it consists of various landscape elements. The riparian ecosystem is important to people. Its water is extracted for irrigation and drinking supplies. Biodiversity and many wetland species are protected here. The riparian ecosystem is diverse and needs to be preserved well. So, it is necessary to measure the features of the urban stream accurately to figure out the change of the riparian ecosystem. However, the traditional Electronic Distance Measurement(EDM) surveying is difficult to measure the curvilinear features of the stream - e, g, angle, curve. The beacon Differential Global Positioning System(DGPS) can handle to measure the curvilinear shape. Therefore, the purpose of this study is to measure the change of the river bed in urban stream accurately using realtime beacon DGPS, and ultimately to provide the basic data for identifying the change of the river ecosystem.

Urban Stream Landscape Improvement After Natural-Style Stream Restoration - Case Study of Yangjae Stream, Seoul - (도시 자연형하천 공사 후의 경관개선방안 - 서울시 양재천을 사례로 -)

  • Kim, Sun-Gun;Kim, Go Eun;Lee, Ji Eun;Shin, Dong-Hoon;Lee, Kyoo-Seock
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.7 no.5
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    • pp.66-74
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    • 2004
  • Since 1960s urban streams in Seoul have been dried and polluted because of urbanization. So, these devastated urban stream environment need to be restored for the better life of residents. Since 1995 stream restoration project which is called Natural-Style Stream Project have begun. However, some projects focused on the restoration of park-style open space rather than restoration of stream environment. As a result there are some stream landscapes to be improved. Therefore, this study aims to investigate the current status of urban stream landscape after Natural Style Stream Project and to propose the alternatives for the urban stream landscape improvement. The study site is Yangjae stream, Seoul.

The Effects of Urban Stream Ecological Experience Program on the Environmental Sensitivity of Elementary School Students (도시하천 생태 체험 프로그램 적용이 초등학생의 환경 감수성에 미치는 영향)

  • Bae, Hyo-Seon;Choi, Do Sung;Kim, Young Rock
    • Hwankyungkyoyuk
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    • v.24 no.1
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    • pp.66-75
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    • 2011
  • The goal of this study is to investigate the effect of ecological experience program at the urban stream on the environmental sensitivity of elementary school students. In order to perform this study, two classes of 6th graders of M elementary school in Gwangju were selected and divided into two groups; one groups was the experimental group that undergoes ecological experience program at the Gwangju River, and another group was the control group that studied about environment in the classroom. The results of this study were as following. First of all, the experimental group has more influence on the environmental sensitivity than the control group. Secondly, the ecological experience program at the urban stream can be the effective method to build the environmental sensitivity of elementary school students. In conclusion, the results are showing that the ecological experience program at the urban stream helps elementary school students to change their environmental sensitivity in positive ways, also it gives idea that how to protect the environment and what they actually can do.

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Identification of Urban Stream Sandbar Change After Concentrated Storm during Summer (집중호우 후 도시 자연형하천의 사주변화 파악)

  • Kim, Jae-Cheol;Lee, Sang-Hwa;Shin, Dong-Hoon;Lee, Kyoo-Seock
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.9 no.6
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    • pp.162-167
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    • 2006
  • The urban stream includes the channel and sandbars. The sandbar plays a key role in the riparian ecosystem. For birds and insects the sandbar offers a small strip of habitat and fish and other fauna feed in the boundary of sandbar where eddies occur. So, it is important habitat and source for the flow of energy, matter and organisms through the landscape and act as ecotone between the terrestrial and stream corridors. However, the sandbar changes continuously by the natural process. Thus, it is necessary to measure the shape and area of the sandbar accurately for the efficient urban stream management for the amenity of urban residents and stream protection. The study site is Yangjae Stream where the first natural-style urban stream restoration projected was impelemented by the support of Ministry of Education in Korea. The measurement was taken by the beacon Differential Global Positioning System (DGPS) and the data were stored and analyzed using ArcView Geographic Information System (GIS) program. Therefore, the purpose of this study is to measure the change of sandbars in the urban stream after concentrated stormwater during summer.

Development of Concentration Time and Storage Coefficient Considering Regional Trend in Urban Stream Watershed (지역적 성향을 고려한 도시하천 유역의 도달시간 및 저류상수 공식 개발)

  • Bae, Deg-Hyo;Kim, Yong-Jae
    • Journal of Korea Water Resources Association
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    • v.48 no.6
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    • pp.479-489
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    • 2015
  • The objective of this study is to develop the equations for concentration time and storage coefficient considering regional trend in urban stream watershed for reliable hydrological analysis. The 13 basins located in Jungrang, Tan, Anyang, and Hongje stream are selected for the data collection and formula development in this study. The stepwise multiple-regression analysis is used for the development considering watershed, urban, and precipitation characteristic indices. The developed formulae are compared with the domestic and foreign empirical formulae and evaluated the accuracy in urban stream area. It shows the computed value from the equation developed in this study is more accurate than those from other empirical formulae. The error sum, average error and RMSE of computed values from the developed equations in this study are the lowest. The formulae considering the regional trend of urban stream watershed are worth in terms of showing better results than the domestic and foreign empirical formulae. It can be concluded the developed formulae can be useful in urban stream watershed.

Community Structure of Benthic Macroinvertebrate Affected by Lake Water and Sewage Effluent at Urban Stream in Gwangju, Korea

  • Yoon, Sang-Hoon;Jung, Suk-Kyeong;Seo, Gwang-Yeob;Cho, Young-Gwan
    • Korean Journal of Ecology and Environment
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    • v.50 no.3
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    • pp.325-336
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    • 2017
  • The ecosystem in the Gwangju Stream has taken a wide range of disturbance such as the discharging water of sewage treatment plant, the lake water and the river water from different water system over the past decade. This study was figured out some significant influence factors by analyzing the relationship between biotic and abiotic factors in the urban stream. Abiotic components included 15 water quality variables which were measured in five sampling sites along the stream from October 2014 to July 2015, whereas the benthic macroinvertebrates found in those sites were used to estimate various biotic indices representing the ecological status of the community. The results of correlation analyses indicated that abiotic factors by human activities affected on the inhabitation of benthic macroinvertebrates more than biotic factors. The results of cluster analyses and ANOVA tests also showed that biotic and abiotic characteristics were clearly different in season. The main influence factors of cluster analysis by sites were $NH_3-N$, EPT(I) and DO. It was considered that more various statistical analyses would be necessary to find some different relationships and influence factors between biotic and abiotic variables in the urban stream.

Analysis of Flood Characteristics in Urban Stream Basin Using Numerical Models (수치모형을 이용한 도시 하천의 홍수특성 분석)

  • Yoon, Sun-Kwon;Moon, Young-Il;Kim, Jong-Suk;Choi, Byung-Hwa
    • 한국방재학회:학술대회논문집
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    • pp.599-602
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    • 2007
  • Flood damage has been increased due to abnormal climate and extreme rainfall. Especially, the increase of impervious areas and the decrease of flow travel times due to the urbanization have been caused heavy division of flood with the recent rainfall characteristics. In this study, hydrodynamics flow analysis has been needed two dimensional numerical analysis for correct stream flow interpretations on bridges as hydraulic structures in rivers. Therefore, comparative analysis has been accomplished by using HEC-RAS model and SMS-RMA2 model for one and two dimensional flow. Also, flood characteristics have been analyzed in urban stream basin.

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