• 환경영향평가
• /
• 제19권5호
• /
• pp.511-525
• /
• 2010

Understanding of the hydraulics of flow over vegetation is very important to support the management of fluvial processes. The objective of this study is to assess the effects of hydraulic influence by tree planting in a compound channel with vegetated floodplain. This study analyzes the influence of tree planting on hydraulic features in Young-river in Munkyung city using HEC-RAS and RMA-2 model. The study results showed that there is a rise in water surface elevation and decrease in velocity near vegetated area. It is also ascertained that only negligible effects was seen within the feasible range of freeboard for the existing levees. However, as hydraulic features can vary depending on the aspect of flood inundation during each flood period, it is necessary to accumulate data through continuous data collecting.

• 한국농공학회지
• /
• 제35권2호
• /
• pp.57-64
• /
• 1993

A modified kinematic wave model of the overland flow in vegetated filter strips was developed. The model can predict both flow depth and hydraulic radius of the flow. Existing models can predict only mean flow depth. By using the hydraulic radius, erosion, deposition and flow's transport capacity can be more rationally computed. Spacing hydraulic radius was used to compute flow's hydraulic radius. Numerical solution of the model was accomplished by using both a second-order nonlinear scheme and a linear solution scheme. The nonlinear portion of the model ensures convergence and the linear portion of the model provides rapid computations. This second-order nonlinear scheme minimizes numerical computation errors that may be caused by linearization of a nonlinear model. This model can also be applied to golf courses, parks, no-till fields to route runoff and production and attenuation of many nonpoint source pollutants.

• 한국조경학회지
• /
• 제34권3호
• /
• pp.12-22
• /
• 2006

The purpose of this study is to evaluate visual preferences of the methods for river embankment based on seasonal changes and to reveal the relationship between visual preference and effective factors, which are the physical and esthetic elements inside the river. For this research seven river embankment methods including concrete block, concrete wall, gabion, and vegetated concrete block were selected in Dongchon of Gwangyang. Twenty-eight pictures by the four pictures of each embankment method based on seasonal changes, the winter and summer of the first and second years after construction were used for a photo-questionnaire by 49 participants. In the analysis of the relationship between visual preference and effective factors, the independent variables included eight factors: form of the material, harmony with the surroundings, the cleanness of river floor, the green area of embankment methods, the water area in river floor, the stone and sand area in river floor, the planting area in river floor, and the area of embankment itself. The result of this study are as follows. First, visual preference in summer was higher than in winter, and the summer landscape of the second you scored the highest value for visual preference. Second, similarly to the way the vegetated concrete block produced a green effect, cobblestone and gabion embankments made of natural materials scored higher than others, whereas the concrete retaining wall scored the lowest of all methods because of it's artificiality. Third, the seven independent variables, except form of the material, are proved statistically significant at the 5% level. The water area in river floor, harmony with the surroundings, the planting area in river floor, and the cleanness of the river floor were revealed as more effective factors influencing visual preference. The research results suggest that the riverscape has to be controlled in terms of seasonal change and embankment methods. Natural materials and green effects in embankment methods are more important for increasing landscape preference, and the landscape factors inside a river should also be considered important variables. It is recommended that advanced study on other factors affecting visual preference of the riverscape be carried out to support this research.

• 한국환경과학회지
• /
• 제18권9호
• /
• pp.1011-1015
• /
• 2009

The vegetated porous pavement can be installed as an alternative way to replace the traditional pavement, which contributes less to the water circulation system in the urban area. This study aims to an investigation based on the shadow and pressure of the vehicle system, where the turfgrass get grown and the green block get constructed on the grassy parking lot. This study might achieve these conclusions, in the case of use 'green block' makes grass parking lot, plant a kind of 'zenith' and takes sod thickness 40 mm are more efficient for turfgrass growth in the early times. In the case of parking over 8 hours in a day, after 5 weeks turfgrass growth would come into reduce. So over 4 hours parking and after 9 weeks, we need consider to setting up green block in grassy parking lot. The grassy ground would get pressured by the vehicles' load and it would bring into some damage due to the load after 3 weeks. So we should put the grass's growth root point under the designed a top of 'green block' level. When the vehicle amounts and parking density is in a low level, it could be an environmentally friendly product.

• 한국해양학회지:바다
• /
• 제16권2호
• /
• pp.70-80
• /
• 2011

연안 하구는 인위적인 개발압력이 상존하며 자연적인 변화에도 민감하게 반응하는 지역이다. 따라서 보존과 지속 가능한 이용을 위해서는 하구 생태계의 구조와 기능에 대한 이해가 필요하며, 인위적 혹은 자연적 변화에 어떻게 반응할 것인지를 아는 것이 필요하다. 하구 생태계 변화의 방향과 현 상태를 용이하게 판단하기 위한 노력의 하나로서 비오톱(biotope)과 하구 타입 분류(typology)를 이용하여 "생태 구역"을 정의하였다. 하구댐의 유무, 염분특성, 식생유무에 따라 16개의 생태 구역을 정의하였고, 고성만에 위치한 고성천 인근 4개 하구(배둔, 구만, 마암, 고성) 생태계에서 지형, 하상경사, 퇴적물 특성, 염분 구조, 식생 면적 등을 통해 생태구역 구분을 시도하였다. 고성천 인근 하구에는 총 16개 생태구역 중 7개가 구분되었다. 자연형 하천인 구만천, 마암천, 배둔천의 상류에는 NFB(natural, fresh, bare)가 나타나고 있으며, 기수 지역에는 NLV(natural, low salinity, vegetated)가 그리고 갯벌에는 NHB(natural, high salinity, bare)가 나타났다. 폐쇄형인 고성천의 경우 담수지역에는 CFB(closed, fresh, bare), 이후 하구쪽으로 CFV(closed, fresh vegetated)가 나타났다. 갈대가 넓게 서식하는 하구댐 안쪽지역은 CLV(closed, low salinity, vegetated)가 나타나며, 거산방조제 바깥쪽은 CHB(closed, high salinity, bare)가 나타났다. 고성천의 CHB와 CLV 지역은 방조제가 하구 생태계에 미치는 영향을 잘 보여주고 있다. 염분이 비교적 높고, 수심이 갚은 수로나 갯벌이 존재하던 CHB 지역이 하구둑에 의해 고염분 지역과 단절되면서 염분이 감소하고, 조석의 영향이 줄어들면서 침수가 줄고, 결국 갈대가 서식하기에 적합한 환경으로 바뀌게 되며, CLV로 바뀐 것으로 여겨진다. 국내의 여러 하구에 나타나는 생태구역을 데이터베이스화하여 각 생태구역의 출현 분포를 파악하는 것이 필요하며, 이러한 자료는 인위적, 자연적 변화에 의한 하구 생태계 변동을 예측하고 관리/대응 방안을 마련하는데 이용될 것이다. 생태구역 변화는 생태구조와 가능의 변화를 가져오기 때문에 생태계 역할 및 가치의 변화를 수반하며, 생태 구역 변화를 야기하는 사업의 타당성을 판단하는 근거자료로 이용될 수 있다.

• 해양환경안전학회:학술대회논문집
• /
• 해양환경안전학회 2007년도 추계학술발표회
• /
• pp.57-60
• /
• 2007

북방한계선 주변의 한강하구는 지난 60년 동안 개발 및 이용이 금지되었기 때문에, 자연하천의 모습을 간직하고 있다. 그러나 최근 들어 경인수로를 비롯한 민간 이용을 위한 논의가 이루어지고 있으나, 한강하구의 기본적인 특성에 관한 정보가 부족한 실정이다. 본 연구에서는, 인공위성 합성개구레이더(SAR)를 이용한 하구역 퇴적상의 변동 조사를 실시하고, 퇴적상을 기반으로 한강하구 뱃길을 제안하고자 한다. 2000년부터 2005년까지의 Radarsat-1 영상을 이용하여 시계열해석한 결과에 따르면, 1) 한강 하구역은 집중호우등 에 의해 부유사가 많이 발생하며, 2) 식생역(vegetated area)은 거의 안정화단계에 있으며, 3) 퇴적상(bar)의 월 변동성은 크지 않으나, 매년 발생하는 호우 등에 의해 퇴적상의 위치 변화는 상당히 컸다. 여기서 얻어진 퇴적상의 변동 특성을 기반으로, 북방한계선 이남의 한강 수역에 대한 뱃길의 설계 방향을 제시하였다. 향후, 장기간에 대한 위성 및 현장 조가를 바탕으로 자연하천의 특성을 훼손하지 않는 범위에서의 개발이 이루어져야 한다.

• 기술사
• /
• 제38권3호
• /
• pp.1-5
• /
• 2005

As a method of anti-fire construction in forest region it is proposed to build fuelbreak(vegetated firebreak). Fuelbreak can separate the large area conifer forest into smell parts combined with natural firebreaks. Fuelbreaks can prevent forest fire effectively and also have other functions benefiting the forest ecosystem and environment. 3 kinds of construction skills are introduced for the silviculture technique to build fuelbreaks. And it is proposed to build the firebreaks network in national scale.

• 한국대기환경학회:학술대회논문집
• /
• 한국대기환경학회 1999년도 추계학술대회 논문집
• /
• pp.175-177
• /
• 1999

도시주변의 녹지의 대기정화기능이 중요하다는 인식이 일반화되어 있는 데 반하여, 여기에 대한 구체적인 분석이 이루어진 바는 없다. 특히, 전체면적의 87％가 녹지(임야, 전답 및 과수원)로 이루어진 개발제한구역(건설교통부, 1998)이 흡수하는 오염물질의 량은 궁금할 뿐 아니라 최근 논의되고 있는 개발제한구역해제와 관련하여 민감한 사항이기도 하다. 본 연구에서는 녹지의 대기정화기능에 대한 정량적인 분석을 목적으로 오염물질의 대기 중 확산이론에 근거하여 해석/수치모델을 모색했다.(중략)

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
• /
• pp.534-537
• /
• 2005

Polarization of the radar wave refers to the ellipticity angle and orientation angle of the polarization ellipse. An evaluation of the polarization response can help understand the scattering mechanisms involved for a particular area of interest or provide information for image classification and algorithm section. C- and L-band polarization responses measured at urban area show the results that the polarization behavior for dihedral comer reflector or short, thin cylinder reflector appears at located in city streets or buildings site which are lined up and the polarization behavior for a large conducting sphere appears at parts of test site particularly river, flat, and vegetated areas. Also, the co- and cross-polarized response graphs and polarimetric parameters are discussed.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 2003년도 학술발표논문집
• /
• pp.615-618
• /
• 2003

A prototype of 76 ha Shi-hwa constructed wetland was constructed for the first time in Korea to purify severely polluted stream water. Hydrology, vegetation(macrophyte) and water quality for Banwol and Donghwa wetland built in Shi-hwa tidal reclaimed area were monitored to evaluate the performance of the wetlands. The overall efficiency for the treatment of polluted stream water using the wetlands showed no significant improvement. The monthly average removal rates on SS, BOD, TN and TP for Banwol and Donghwa wetlands showed 66.5% and 62.8%, 14.8 and 34.3%, 33.9 and 47.1% and 20.8 and 51.6%, respectively. It is considered that three major factors, ie. wide fluctuations in inflow rate, short hydraulic retention time and small open area compared with vegetated area could have a great influence on low system efficiency.