• 한국환경복원기술학회지
• /
• 제5권1호
• /
• pp.1-7
• /
• 2002

The effects of floating islands on the changes in phytoplankton community structure were investigated in a small artificial pond. The floating islands planted with various emergent macrophytes covered 35% of total water surface area of the pond. Total 17 genera and 25 species of phytoplankton were found in the pond, of which Dinophyceae was 1 genera and 1 species, Cyanophyceae 1 genera and 1 species, Bacillariophyceae 6 genera and 8 species, and Chlorophyceae 9 genera and 15 species. Dominant phytoplanktons under floating islands were changed from Aphanizomenon sp. as a Cyanophyceae to Golenkinia radiata, Kirchneriella contorta and Micractinium pusillum as a Chlorophyceae for 56 days after the construction of floating islands on July 24, 2001. The changes of dominant phytoplanktons of the control without floating islands were similar to those under floating islands in July and August, but Aphanizomenon sp. was rapidly increased in the control sites in September. About 99% of the cell number of Aphanizomenon sp. was disappeared for a month after construction of floating islands. Species diversity of phytoplankton under the floating islands of Iris pseudoacorus was higher than those of other macrophytes as well as the control without floating islands. The cell numbers of Cyanophyceae and Chlorophyceae were fewer under the floating islands of I. pseudoacorus than those of other macrophytes. Our results showed that the floating islands could be a useful eco-technique for the control of water bloom by Cyanophyceae and Chlorophyceae in a pond ecosystem.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 2000년도 학술발표회 발표논문집
• /
• pp.550-556
• /
• 2000

Three floating islands were constructed on the surface of the reservoir, each consisting of 10 16-㎡ (4${\times}$4 m) segments, made of wood frames and floats. Three species of aquatic macrophytes were planted in each island on June, 1998. Phragmites australis was considered as the suitable aquatic macrophyte for the floating islands since it maintained the most efficient root and shoot balance among the macrophytes. The net primary productivity of P. Australis was 3,604 g/㎡ based on dry weight in 1999, with uptake rates of nitrogen and phosphorus estimated at 77.4 g/㎡/yr and 5.7 g/㎡/yr, respectively. The result of water quality simulation for the floating islands showed that, through adsorption of nutrients and light screening, they could reduce the amount of phytoplankton, thereby decreasing COD concentration.

• 건축구조
• /
• 제17권1호
• /
• pp.71-77
• /
• 2010

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 2001년도 한국생물과학협회 학술발표대회
• /
• pp.164.3-165
• /
• 2001

No Abstract, See Full Text

• 한국물환경학회지
• /
• 제32권2호
• /
• pp.205-215
• /
• 2016

In order to improve water quality in the Paldang Lake, a riparian vegetation belt, treatment wetland, and artificial floating island were designed for introduction in the upland field, the estuary of tributaries, and the section of water facing mountainous land, respectively. We synthesized vegetation information collected from a reference river and found that herbaceous, shrubby, and tree vegetation zones tended to be dominated by Phragmites japonica, Phalaris arundinacea, etc.; Salix gracilistyla, S. integra, etc.; and S. koreensis, S. subfragilis, and Morus alba, respectively. In our plan, the herbaceous vegetation zone, which is established on floodplains with a high frequency of disturbance, will be left in its natural state. A shrubby vegetation zone will be created by imitating the species composition of the reference river in the ecotone between floodplain and embankment. A tree vegetation zone will be created by imitating species composition on the embankment slope. In the treatment wetland, we plan to create emerged and softwood plant zones by imitating the species composition of the Zizania latifolia community, the Typha orientalis community, the P. communis community, the S. integra community, and the S. koreensis community. The floating island will be created by restoring Z. latifolia and T. orientalis for water purification purposes.

• 미생물학회지
• /
• 제43권1호
• /
• pp.40-46
• /
• 2007

생태계가 파괴된 파로호에 수초대를 복원하는 방법으로 rubberized coconut fiber를 식생기반재로 사용한 인공식물섬을 2003년 8월에 설치하였다. 인공식물섬 식생기반재에서는 식물이 자랄 수 있을 정도로 영양염이 농축되어 꽂창포(Iris ensata), 노랑 꽃창포(Iris pseudoacorus), 갈대(Phragmites communis)등 식재된 식물이 잘 자랐다. 이 과정에서 세균의 역할을 알아보기 위하여 2004년 4월부터 10월까지 2주 간격으로 총세균수, 활성세균수, ${\beta}-glucosidase$, phosphatase를 조사한 결과 인공식물성 식생기반재의 공극수에서 각각 평균 $28.6{\times}10^{6}\;cells/ml,\;22.7{\times}10^{6}\;cells/ml,\;452.9nM/L/hr,\;16381.9nM/L/hr$로 조사되어 파로호 호수물보다 각각 10배, 15배, 22배, 38배 높았다. 그리고 영양염류농도는 총인과 충질소가 식생기반재 공극수에서 각각평균 1.06 mg/L, 12.5 mg/L으로 조사되어 호수물보다 12배, 3배 높았다. 이 결과 인공식물섬 식생기반재에서 새로운 생태계가 만들어졌으며, 이 생태계에서 세균이 중요한 역할을 하여 빈-중영양상태의 호수물에서도 식물이 잘 자랄 수 있었다.

• 상하수도학회지
• /
• 제32권6호
• /
• pp.487-497
• /
• 2018

Water quality improvement processes for stagnant area consist mainly of technologies applying vegetation and artificial water circulation, and these existing technologies have some limits to handle pollution loads effectively. To improve the purification efficiency, eco-friendly technologies should be developed that can reinforce self-purification functions. In this study, a multi-functional floating island combined with physical chemical biological functions ((1) flotation and oxidization using microbubbles, (2) vegetation purification and (3) bio-filtration with improved adsorption capacity) has been developed and basic experiments were performed to determine the optimal combination conditions for each unit process. It has been shown that it is desirable to operate the microbubble unit process under conditions greater than $3.5kgf/cm^2$. In vegetation purification unit process, Yellow Iris (Iris pseudacorus) was suggested to be suitable considering water quality, landscape improvement and maintenance. When granular red-mud was applied to the bio-filtration unit process, it was found that T-P removal efficiency was good and its value was also stable for various linear velocity conditions. The appropriate thickness of filter media was suggested between 30 and 45 cm. In this study, the optimal design and operating parameters of the multi-functional floating island have been presented based on the results of the basic experiments of each unit process.

• 해양환경안전학회지
• /
• 제27권7호
• /
• pp.1004-1010
• /
• 2021

선박의 해양사고 중 부유물 감김사고는 운항지연에 그치지 않고 대형 인명 피해사고까지 이어질 수 있어 이에 대한 예방책이 요구되고 있다. 이에 본 연구는 영해와 베타적경제수역 등을 포함한 해역의 최근 5년간 선박의 부유물 감김사고 데이터를 시·공간적 측면에서 분석하고, 관련 연구 분야에 기초 자료를 제공하고자 한다. 부유물 감김사고의 상대적 밀도 분포를 시각화하기 위하여 이차원 평활 히스토그램을 적용하였으며, 시간대, 주·야간, 계절에 따른 각 변수가 감김사고에 미치는 영향을 분석하기 위해 다항 로지스틱 회귀모형을 적용하였다. 공간적 분석결과 전체 사고에 대해 평활화된 밀도 값이 높은 곳은 진해만을 포함한 거제도~통영 해상이었으며, 서해 전곡항 인근 해상, 제주도 북부 해상으로 나타났다. 시간적 분석결과 부유물 감김사고는 주간에 71.4%로 가장 많이 발생하였으며, 계절별로는 가을철이 다른 계절에 비해 가장 많이 발생한 것으로 분석되었다. 또한, 어선, 수상레저기구, 낚시어선의 감김사고 발생 가능성이 화물선 보다 높은 것으로 조사되었다. 본 연구의 시·공간적 분석결과는 향후 부유물에 대한 단속강화 및 제거를 위한 해양경찰함정 배치와 시간별·계절별 사고방지를 위한 부유물 사전 제거작업 대책 마련의 기초자료로 활용될 것으로 기대된다.

• 한국환경복원기술학회지
• /
• 제5권1호
• /
• pp.59-65
• /
• 2002

The community of common reed (Phragmites australis) is expanded by the development of new shoots from nodes of rhizomes and old shoots in natural environments. We developed the useful technique to construct reed mats of floating islands developed from shoot nodes of reeds for the purpose of the rapid stabilization of vegetation and the application of adapted plants with their specific environmental conditions. The vegetation development was compared in the floating islands planted with the different reed samples. The reed samples were consisted of four types : long shoot in the length of 100 cm (AG I), short shoot of 15 cm (AG II), long rhizome of 100 cm (BG I) and short rhizome of 15 cm (BG II). Shooting started earlier in BG I and BG II than in AG I and AG II. But the rate of shooting was higher in AG I and AG II than in BG I and BG II. After four weeks, AG I and AG II were higher than BG I and BG II in the biomass and density of newly developed shoots. These results showed that the construction of sod mats by planting only reed shoots was a useful technique to develop vegetation on the floating islands.

• 한국환경생태학회:학술대회논문집
• /
• 한국환경생태학회 2006년도 임시총회 및 학술논문발표회
• /
• pp.72-74
• /
• 2006