• Korean Journal of Environment and Ecology
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• v.20 no.2
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• pp.235-258
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• 2006

The monitoring of vegetation and water quality before(2003), during(2004) and after(2005) the restoration work of Cheonggye Stream indicated that $BOD_5$ concentration before the project averaged 51.1mg/L and that both the inflow of water from Hang River and the funnel of subway station water into the stream lowered the $BOD_5$ to 3.3mg/L, improving its water quality to the third grade. Species of plants slightly increased from 121 to 132 after the restoration. Specifically, perennial plant comprised 35.6%, an increase from 24.8% recorded before the restoration. Phragmites communis and Zoysia japonica communities were observed as the introduction vegetation. However, Humulus japonicus and Erigeron canadensis communities, which were classified into the first grade according to the vegetation conservation classification, were found to be still prevailing though they were dominant community before the restoration, meaning that the ecological condition of plants had not changed very significantly. An the other hand the water quality of the reference reach was classified into the first grade based on $BOD_5$, which implies the water quality of the section was better than the project reaches. Besides the section had more diverse plant species which numbered 154, and furthermore, the rate of immigrated plants comprised 13% which was lower than 28.8% recorded by the project sections. The project reaches are considered to be inferior to the reference section in terms of ecological condition. The effectiveness of the stream restoration cannot be determined only by such short-term investigation as was conducted in this study, and it is considered that the effectiveness of the restoration of Cheonggye Stream can be determined only if investigations in other major factors are conducted over the long-term period.

• Korean Journal of Environment and Ecology
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• v.33 no.1
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• pp.64-74
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• 2019

The purpose of this study is to assess the degree of vegetation recovery such as the vegetation change and the effect of artificial restoration measures according to the number of years since the restoration works at the damaged Jungbong and Nuebong area in Mudeungsan National Park. We set up a total of 21 survey areas including 11 monitoring areas to analyze the flora, relative dominance, species diversity, and similarity in the restored site after relocation of Zungbong army base in 1996 and the restored site after the demolition of Neeebong telecommunication facility in 1999 and 10 control areas in the adjacent natural forest to assess the vegetation recovery in the restored sites and the nearby natural forest. The Mean Similarity Index of seed composition was relatively low at 3.5% in the Jungbong restoration site 17 years after the restoration, and the height of shrub layer, in which azaleas and furred azaleas appeared, recovered to the level of 82.6%. We concluded that it is necessary to continue monitoring the restored sites to develop the recovery assessment method and recovery work technology for sub-alpine areas in Mudeungsan National Park and other national park areas.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.437-440
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• 2005

서울시는 복개천이었던 청계천을 복원하여 도심지를 통과하는 하천을 만들기 위해 청계천 복원 공사를 수행하고 있다. 청계천 복원 공사 구간을 포함하는 유역에는 서울시 지하철 1, 2, 4, 5, 6호선 등이 통과하고 있으며, 도시 내 비수시설, 하수관거시설 등 자연적인 수문현상에 영향을 주는 인위적인 요소들이 복합적으로 존재하고 있다. 때문에 청계천 복원 공사 후 유역내의 여러 요인들과 공사의 정도에 따라 누수가 발생할 것으로 예상된다. 공사 후 청계천에서의 누수율에 대한 측정은 공사의 성공여부를 결정하고, 향후 지속적인 누수가 예상되는 청계천의 유지 보수에 있어서 매우 중요하다. 특히 청계천의 손실량의 대부분을 차지할 지하로의 누수에 대한 측정은 매우 중요하다. 따라서 누수율을 측정하고, 누수율과 주변 요인들과의 관계를 추정할 수 있는 수문모델링을 수행할 필요성이 있다. 수문모델링은 일회성으로 끝나는 것이 아니라 지속적으로 수행될 필요가 있는데, 그러기 위해서는 청계천 유역에서의 지속적인 수문관련 인문 자연자료를 획득하여 정리할 필요성이 있다. 본 연구에서는 청계천 복원 공사 구간의 유역에 대한 인문 자연자료를 GIS(지리정보시스템)을 이용하여 수치도면과 속성테이블 형태로 데이터베이스화한다. 그럼으로써 청계천 주변 유역에 대한 도시형 수문 모델링 연구에 활용하고, 아울러 공사 후 지속적으로 누수율을 측정하는데 자료를 원활히 제공하여 청계천의 유지 보수에 도움을 줄 수 있는 체계를 마련하였다.

• Journal of the Korean Geotechnical Society
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• v.22 no.11
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• pp.13-23
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• 2006

The sinkhole and leakage in dam core were detected at one of earth fill dams in Korea. The damage areas in the core of the dam were repaired by compaction grouting method. This study is to evaluate compaction grouting activity by in-situ and laboratory experiments before, during and after the remedial work. The intensive site investigation and geophysical survey were conducted during and after the compaction grouting work. The compaction grouting work was carried out for the damaged dam core between June 16 and August 24, 2000. The leakage reduction generally occurred in the core of the dam after the remedial work. The use of compaction grouting was considered the proper countermeasures for repairing the damaged dam. It shows that the loose or voided zones have been properly filled and the leakage has been reduced by about 96% of that before the treatment of the remedial work performed at dam core by compaction grouting.

• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.1
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• pp.103-111
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• 2021

Naju Seokdanggan, Treasure No. 49, was dismantled and reconstructed due to poor performance. During construction, the crack area was reinforced and the inclination was improved. It is necessary to analyze the stiffness changes before and after the reconstruction of these cultural properties, and to establish a database of related information. In addition, there is a need for research on a scientific non-destructive testing method capable of predicting or evaluating the reinforcing effect. In this study, a simple equation for estimating the overall stiffness of the structural system was derived from information on the elasticity coefficient and the natural frequency measured by vibration tests before and after reconstruction work, and the applicability of the equation was examined. If the stiffness of important cultural properties is regularly investigated by the suggested method, it is judged that it can be used as data to estimate the time when structural safety diagnosis is necessary or when repair or reinforcement is necessary.

• Water for future
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• v.37 no.1
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• pp.60-62
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• 2004

• Water for future
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• v.56 no.5
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• pp.71-81
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• 2023

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.510-511
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• 2003

서울 도심지 청계천 구역에서 대규모 하천 복원공사가 2003년 7월 1일부터 시작되었다. 공사구간은 연장길이 약 5.84km로서 이러한 도심지내 대규모 복원사업은 세계적으로도 그 사례가 드물다. 도시의 열환경을 해석ㆍ평가하는 데는 대상으로 하는 지역의 온도와 습도의 시ㆍ공간적 기상관측 자료가 중요한 정보가 된다. 그러나, 이러한 평가를 위하여 지금까지는 도시기후 모델을 이용한 수치 시뮬레이션에 의한 평가만 이루어 지고 있었으며, 실측에 의한 열환경 개선효과 등의 검증은 극히 미흡하였다. 사실 실측에 의한 검증을 위하여는 청계천 복원 전후의 관측과 충분한 관측지점 수의 확보가 이루어져야 한다.(중략)

• Proceedings of the Korea Contents Association Conference
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• 2004.11a
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• pp.56-61
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• 2004

청개천 복원 공사가 시작되고 청계고가가 사라지고 예전의 청계천 모습을 사람들은 기대하고 있다. 우리나라 뿐만아니라 세계의 여러 나라는 지금 자국의 빛난 옛 문화에 대한 복원사업을 계속해서 추진하고 있다. 이만큼 문화컨텐츠분야는 자국의 역사의 재확립이라는 면에서 중요시되고 있는 것이다. 문화컨텐츠 복원은 다양한 방법으로 이루어지고 있는데 이 논문에서는 몰입형 가상현실 시스템을 이용하여 고증을 거친 문화 컨텐츠의 복원 과정을 다루고자 한다. 가상현실 시스템에서의 복원과 실제의 복원과정의 차이점을 알아보고 이러한 문화 컨텐츠 복원이 VR측면에서 어떠한 가치를 가지고 있는가 또한 알아본다. 그리고 이러한 몰입형 가상현실 시스템을 가지고 문화컨텐츠의 복원뿐만 아니라 다른 문화컨텐츠 분야에의 활용방안을 이 논문을 통하여 제시한다.

• Korean Journal of Environment and Ecology
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• v.35 no.3
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• pp.294-304
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• 2021

This study aims to obtain basic data for systematic restoration by analyzing the monitoring results of the Shimwon Valley Ecological Landscape Restoration Project area in Jirisan National Park. In 2017, when the restoration project was completed, 12 monitoring plots and 4 control plots were installed for vegetation monitoring, and changes in the relative dominance, species diversity index and similarity between 2017 and 2020 were analyzed. The species diversity index of the surveyed areas where trees were planted during the restoration project was 0-1.4552, and the similarity index with the control group was 0% except for one survey area at 1.32%. The very low species diversity index and similarity index in the survey areas were attributed to the loss of trees planted during the restoration project due to death, damage by wild boars, or erosion by running water. On the other hand, the species diversity index was 0.9538-2.3222 in the monitoring plot where no tree was planted, and the similarity index was analyzed to be as high as 8.33%. It is necessary to continue the long-term monitoring for the development of ecological landscape restoration methods in the national park and analysis of the succession in monitoring plots where no trees were planted.