• 한국환경복원기술학회지
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• 제9권4호
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• pp.1-12
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• 2006

The usages of urban riverine areas for the Gapchoen and Yudungcheon in Daejoen City were evaluated by analyzing riverbed characteristics and water quality and by surveying the status of the floodplain usage including questionnaires of people visiting the rivers. Both rivers appear to be stable with insignificant bed changes as the riverbeds are dominated by gravels. Water qualities of both rivers have been improved significantly over the past decade although there are quite large seasonal fluctuations, which is common in most rivers in Korea. The results of floodplain usage analyses show that Gapcheon is dominated with static uses (>70%) such as promenades and resting facilities, while Yudungcheon by dynamic uses (>44%) such as sports facilities. Overall, both rivers require better plans for riverine area usage management considering a balance between the dynamic uses and the static uses such as natural observation places for education and habitats for birds and fish in the rivers. The questionnaire survey results indicate that overall the present status of both rivers are satisfactory and that water quality improvement is one of the key factors to enhance the value of the riverine areas. Future river restoration should be conducted by taking into account the characteristics of urban rivers in harmony with surrounding natural sceneries.

• Journal of Ecology and Environment
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• 제30권3호
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• pp.251-255
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• 2007

Self-thinning was measured in Salix communities on Bam Island in Seoul at various age stages. $D^2H$ was used to estimate tree biomass, where D is stem diameter at breast height or 10 cm height for plants with height <1.5 m, and H is height. A log-log plot of density versus $D^2H$ and correlation analysis indicated a significant relationship between density and biomass with equation 'log $D^2H$ = -1.27 log N + 7.06'. This indicates that self-thinning affects biomass in the Salix community with -1.27 as the thinning coefficient. If we assume a thinning exponent -3/2, then the allometric coefficient of the equation, log w = a log $D^2H$ + b, is 1.18. This is much higher than that for any other species studied in Korea. There were statistically significant relationships between age and density and between age and basal area and these relationships suggest guidelines for transplantation of willows and for the assessment of Salix community restoration projects in riverine wetlands based on standard density, basal area, and age. The results of this study may also increase understanding of succession processes in Salix community restoration in riverine wetlands.

• 한국생태학회:학술대회논문집
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• 한국생태학회 2002년도 VIII 세계생태학대회
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• pp.113-118
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• 2002

Vegetation and riverine structures were compared among urban and several semi-natural rivers by applying direct gradient analysis and ordination method. Urban rivers showed different species composition from the semi-natural ones. Species composition of semi-natural rivers depended on the geographical positions, such as the upstream, midstream, and downstream and on micro-topographies, such as the waterside, flooding bed, and embankment. Semi-natural rivers showed gentle change in micro-topography, whereas urban one did not so. Our restoration plan to improve the ecological quality of the degraded urban river by imitating semi-natural river was prepared based on those data.

• The Korean Journal of Ecology
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• 제25권4호
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• pp.247-252
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• 2002

Vegetation and riverine structures were compared among urban and several semi-natural rivers by applying direct gradient analysis and ordination method. Urban rivers showed different species composition from the semi-natural ones. Species composition of semi-natural rivers depended on the geographical positions, such as the upstream, midstream, and downstream and on micro-topographies, such as the waterside, flooding bed, and embankment. Semi-natural rivers showed gentle change in micro-topography, whereas urban one did not so. Our restoration plan to improve the ecological quality of the degraded urban river by imitating semi-natural river was prepared based on those data.

• 환경영향평가
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• 제20권1호
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• pp.1-11
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• 2011

This study was carried out to suggest the baseline data necessary for vegetation restoration at riverine wetland within stream corridor. We used the prevalence index for wetland assessment by applying the method of weighted averages with index values based on five hydrophyte indicator status as defined by estimated probability occurred in wetland. We selected near nature and urbanized reach of Gap and Yanghwa streams as experimental site. Although two sites have some different disturbance and characteristics of watershed, they showed that similarity of vegetation community including three dominant species - Salix koreensis, Phragmites communis, Miscanthus sacchariflorus - was very high. But in case of Yanghwa stream, various kinds of emergent plants along wetted condition were distinctly occurred, resulted from difference of hydrological regime and substrate, etc. Degree of naturalness of vegetation at the sampled areas indicated that near nature area of Gap stream and all area of Yanghwa stream were fitted as riverine wetland, while urbanized area of Gap stream has changed into upland condition. In conclusion assessment system using prevalence index would be considered an effective method for evaluating of natural states of riverine wetland, but further integrated consideration of physical, hydrological, and biological factors of stream process, and also with considering the difference between those qualitative data of vegetation community.

• 한국조경학회지
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• 제42권1호
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• pp.123-132
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• 2014

이 연구의 목적은 수변 생태벨트를 조성, 보전, 관리를 위해 수변생태벨트의 진단적 평가방법을 개발하는 것이었다. 평가의 기본 틀은 일본의 제방림 평가방법을 토대로 하였으며, 국내 수변녹지의 현황에 맞게 수정한 1차 수정평가방법으로 1차 시험평가를 실시하였다. 1차 시험평가의 문제점을 보완한 2차 수정안을 가지고 전문가를 대상으로 설문을 실시하고, 그 결과를 반영하여 최종 평가방법을 제안하였다. 최종 평가방법으로 홍천강에서 시험평가를 실시하였다. 최종적으로 제안된 평가방법의 평가영역은 5가지 분야 19가지 항목으로 구성되었으며, 5가지 분야는 치수, 환경기능, 식물생장, 생태벨트기능, 복원잠재성 등이다. 치수분야 평가항목은 수림의 길이, 폭, 밀도 등 3가지 항목으로, 환경기능분야는 공원이용, 경관 경계 및 주연부, 미기후 조절, 비점오염 제어 등 4가지 항목으로, 식물생장분야는 종 구성, 수림 높이, 계층구조, 덩굴식물, 식물활력도, 후계목 생장 등 6가지 항목으로, 생태벨트기능 분야는 종적 연결성, 횡적 연결성, 하천내 수림 혹은 서식지, 제방상단 도로 등 4가지 항목으로, 마지막으로 복원잠재력분야는 지형, 인접 토지이용 등 2가지 항목으로 구성되었다. 점수체계는 1~4까지 부여되었으며, 최종 평가결과 등급체계는 우수한 1등급에서 가장 열악한 5등급까지 5등급으로 구분하였다. 각 분야별 항목별 가중치는 동일하게 하였으며, 분야별 점수 평균값을 다시 평균하여 최종 등급을 판정하는 것으로 하였다. 홍천강을 대상으로 적용된 평가방법은 각 구간의 수변 생태벨트 실태를 효과적으로 보여주었다.

• 대한토목학회논문집
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• 제31권4B호
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• pp.383-391
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• 2011

본 연구에서는 수변생태벨트 조성 사업에 있어서 우선구간을 선정하기 위한 단절구간 평가 방법을 제시하였다. 대상 하천은 홍천강으로 하였으며, 홍천강 약 96 km를 2 km의 구간으로 구분하여, A1-P3의 48개 구간에 대한 도상조사 및 현장조사를 실시하였다. 단절 항목은 크게 연결성 및 생태적 기능성 단절로 구분하였으며, 연결성 단절에서는 토지이용 등의 면적 단절과 도로 및 제방 등의 선적 단절로 구분하였다. 또한 생태벨트의 기능성 단절은 기존 연구결과의 일부 항목을 도입하여 크게 하천 수로 및 하상구조, 수림대 및 식생, 하천구조물로 구분하여 평가하였다. 현장조사를 통하여 각각의 세부 항목별 단절 점수를 부여하였으며, 각 단절 항목별 평균하여 이를 등급화 하였다. 그 결과, F1-G2 구간에서 2등급 이상의 연결성 및 기능성 단절 등급을 보이는 것으로 나타났으며, 다른 구간에서는 연결성 단절이 2등급으로 높지만, 기능성 단절이 3-4등급으로 낮아 복원이 시급한 구간이 아닌 것으로 평가되었다. 본 연구 결과는 향후 수변생태벨트 조성 등의 하천복원 사업에 있어 대상 하천내 우선 사업구간 선정에 기여할 수 있을 것으로 보인다.

• 한국습지학회지
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• 제4권2호
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• pp.1-11
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• 2002

The morphology, seed germination, and life history of Salix nipponica were investigated in the wetland of the Nam-River, Jinju, Gyeongsangnam-do, Korea from 2000 to 2001 to provide the basic data necessary for riverine ecosystem restoration through understanding the growth characteristics of Salix nipponica. Salix nipponica had stomata on only lower side and stomata type was paracytic. Salix nipponica produced many small and light seeds. The seed number per mature ament was 1599.4, seed mass of 0.04 mg, and fertilization rate of 66.1%. Seed germination was little affected by light. Germination rate was high and mean germination time was short Under flooding condition, seeds were germinated normally and were viable after as much as 14 days of flooding. But there were no differences under various water depths on germination rates. Tree age was closely correlated with more stem diameter than tree height and there was no difference of growth rate between male and female tree. Growth rate was most rapid for 2 to 3 years after germination, and length growth was almost stopped for more than 11 years even though mass growth was done. Besides even a second-year indivisual was flowered.

• 한국환경과학회지
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• 제16권5호
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• pp.649-655
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• 2007

This study was focused on estimating instream flow, and its optimal alternative for securing the required total amount of instream flow was also researched in order to restore ecosystems and riverine aesthetics of the Mugeo Stream. the first tributary of the Taewha River flowing through the center of Ulsan. In this study the hydraulic and hydrologic conditions and water quality were investigated at specific channel reaches and representative stations of the Mugeo Stream to determine a proper estimate of instream flow. And riverine functions, such as the minimum flow, water duality conservation, fish habitat, and recreation, were considered to restore the environmental functions of the stream, As a result, the total amount of $11,500m^3/day$ was set as the target instream flow for the Mugeo Stream. It was chosen as the optimal alternative for securing the total external supply of $10,000m^3/day$ which have to be transfered from the riverbed flow diverted through the Taewha Main river at upstream of Samho bridge. The water duality throughout the Mugeo Stream channels will be improved considerably to 3-4 mg/l of BOD standard if the target instream flow is supplied and sewage is intercepted by the sanitary sewage system.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2017년도 학술발표회
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• pp.518-518
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• 2017

4대강 사업 이후, 하천변의 환경에 많은 영향과 변화가 있었다. 그 중에서도 하천을 포함한 수변환경의 식생 변화에 가장 큰 영향을 주는 수문학적 조건이 변화하였고, 이에 따른 식생 천이가 지속적으로 발생할 것이기 때문에 그 영향을 분석하는 것이 시급한 과제이다. 이에 따라서, 본 연구의 목적은 수문학적 조건에 따른 하천변의 식생조건의 변화를 분석하는 것으로서, 수문학적 조건의 정량화를 위한 연침수확률(IEPs) 개념을 새로이 제시하고 이에 따른 수변환경과 식생의 변화를 한강에 위치한 비내섬을 대상으로 고찰하였다. 연구 결과에 따라서 P=0.08 이나 그 이하의 IEPs를 가진 구역은 식생 교란이 일어나거나 또는 친수성 식물로서 천이될 것으로 나타났다. 따라서, 하천과 유량에 대한 주무기관이 하천환경에 대해서도 관리업무를 통하여 하천보호를 수행하여야 할 것으로 판단된다.