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硏究論文 : 중국 사막지역의 방풍책 높이와 공극률에 따른 방풍효과 및 설치비용 비교분석
박기형 ( Ki Hyung Park ),( Guo Dong Ding ),( Guang Ling Fang ),김찬범 ( Chan Beom Kim ),( Bin Wu ),( Yan Feng Bao ),( Guang Lei Gao ),정성철 ( Sung Cheol Jung ),문강민 ( Kang Min Moon ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2012 한국환경복원기술학회지 Vol.15 No.6
This study was conducted in Ningxia Hui autonomous region, located at southern part of Mu Us sand land in China. To investigate relationships between windbreak effect and installation cost of sand barriers, plastic net is utilized by using four kind of heights (0.2, 0.3, 0.4 and 0.5m) and four kind of porosities (20, 30, 50 and 70%). These heights and porosities are measured for estimating distances for effective windbreak. It is shown that porosity and the distance have a positive relationship at same heights and porosity on ground indicates a constant figure when height reaches a certain level, regardless of the porosity. This implies that there is a difference of level of windbreak with different porosities; however, distance of windbreak effect is same at the same height of sand barrier. As a result of comparison between porosity of sand barrier on the ground and installation cost in each sand barrier with various heights and porosities (16 combinations), 0.4m and 0.5m height sand barriers describe highest economical efficiency. Within two variables, we concluded that height has a higher impact on windbreak effect than porosity.
위성영상을 이용한 산불피해 이후 자연복원과 인공복원 방법에 따른 식생회복 모니터링
황영인,강원석,박기형,이경철,한상균,권형근,Hwang, Yeong In,Kang, Won Seok,Park, Ki Hyung,Lee, Kyeong Cheol,Han, Sang Gyun,Kweon, Hyeong Keun 국립한국농수산대학교 교육개발센터 2022 현장농업연구지 = Journal of practical agricultural resear Vol.24 No.3
This study was conducted to monitor the vegetation recovery in the areas damaged by the forest fires on the east coast that occurred in April 2000. The study site was a forest fire-damaged area in Samcheok-si, Gangwon-do, and 21 monitoring areas (12 natural restoration sites, 9 artificial restoration sites) were selected to analyze the vegetation recovery trend since 1998. The vegetation recovery trend was compared by calculating the values according to the year using the difference Normalized Burn Ratio (dNBR) and Normalized Difference Vegetation Index (NDVI) based on satellite images (Landsat TM/ETM+ and Sentinel-2A). As the result of this study, all 21 sites, vegetation was recovered, and both groups showed the greatest recovery in summer. In the case of the dNBR, the artificial restored sites showed higher values than the natural restored sites, and in the case of the NDVI, the natural restored sites were higher than the artificially restored sites in summer and autumn. However, the difference between the two groups of natural and artificial restoration sites was not significant. Therefore, the direction of forest restoration after forest fire damage can be effectively restored if properly implemented for the purpose of restoration of the target site.
태풍 곤파스에 의해 발생한 풍도목 특성과 바람과의 관계 분석
윤호중 ( Ho Joong Youn ),박기형 ( Ki Hyung Park ),이명보 ( Myung Bo Lee ),원명수 ( Myoung Soo Won ),김경하 ( Kyong Ha Kim ) 한국임학회 2011 한국산림과학회지 Vol.100 No.2
본 연구는 2010년 9월 2일 강한 바람으로 우리나라 중부 지방에 영향을 미친 제7호 태풍 곤파스로 인해 피해를 입은 홍릉수목원 내 풍도목을 대상으로 풍도목의 특징, 임내·외 풍향 및 풍속의 특징을 구명하고자 실시하였다. 풍도목은 피해 유형에 따라 바람에 쓰러진 나무, 기울어진 나무, 수간이 부러진 나무 등 크게 세 가지로 구분하여 조사하였다. 바람이 불기 시작한 9월 2일 04시부터 바람이 완전히 멎은 12시까지의 풍속을 분석한 결과, 임내 평균풍속과 순간최대풍속은 각각 1.4 m/s와 3.5 m/s 이었으며, 06시 10분 임내 평균풍속과 순간최대풍속이 각각 3.4 m/s와 8.7 m/s로 최고치를 기록하였다. 곤파스의 피해를 받은 2010년 9월 2일과 강풍주의보가 발효되었던 과거 5일(2009년 2월 13일, 2월 20일, 4월 21일, 10월 16일, 2010년 3월 20일)의 평균풍속 차이와 파동을 비교 분석한 결과, 풍도목 발생 원인은 바람의 세기보다는 단위시간당 바람파동횟수와 관련이 깊은 것으로 사료된다. 풍향 분석결과 임내 평균풍향은 방위각 112.5°~180°(ESE-SE-SSE-S)와 247.5°(WSW) 방향에서 불어 들어왔으며, 임내·외 순간 최대풍향 모두 방위각 157.5°(SSE) 방향에서 강하게 불어 들어왔다. 풍도목의 도복 방향과 위치를 분석한 결과 84.0%의 풍도목이 방위각 270°~22.5°(W-WNW-NW-NNW-N-NNE) 방향으로 쓰러졌으며, 97.3%의 풍도목이 완경사지(경사15° 미만)와 경사지(경사 15°~20°)에서 발생하였다. 풍도목 중 침엽수가 45.3%를 차지했고, 활엽수가 54.7%를 차지하였으나, 임상별로 보면 풍도목은 활엽수림보다 침엽수림과 혼효림에서 주로 발생한 것으로 나타났다. This study was carried out to investigate the characteristics of wind damaged trees in the Hongneung Arboretumin Korea. Many trees in the Hongneung Arboretum were damaged by the ``Kompasu``, the seventh typhoon in the year of 2010 having strong impacts on the central region of Korea. Damaged trees were divided into 3 damage types: windthrow, slanted and broken trees. Most of damaged trees (97.3%) were found at low slope (below 15 degree) or medium slope (15~20 degree). The 45.3% of damaged trees were coniferous and 54.7% were deciduous trees. The wind speed was recorded for the duration of the typhoon from 04:00 AM to 12:00 PM on September 2. The average wind speed and the maximum instantaneous wind speed inside the forest were 1.4 m/ sec and 3.5 m/sec, respectively. The highest peak of the average and the maximum instantaneous wind speed inside of forest, 3.4 m/sec and 8.7 m/sec respectively, were recorded at 06:10 AM on September 2. To analyze relationship between wind characteristics and the damage types, the average wind speed and the frequency of wind wave was compared to those of pre-typhoon period (Feb. 13, Feb. 20, Apr. 21, Oct. 16, 2009 and Mar. 20, 2010). The results indicated that the damaged trees were affected by frequent wind wave rather than the wind speed itself. Also average wind direction inside the forest was analyzed to investigate the impact of wind direction on the damaged trees. The wind had mainly blown from SE and SW, and the maximum instantaneous wind direction was SE direction overall. Most of the damaged trees (84.0%) had fallen down to the NW or NE direction. This result showed that the fallen direction of the damaged trees and wind direction was highly related. Therefore, we found that the frequency of wind wave was the main factor of wind damages during the typhoon ``Kompasu`` and wind direction was highly related to the fallen direction.
김찬범 ( Chan Beom Kim ),박기형 ( Ki Hyung Park ),이창우 ( Chang Woo Lee ),윤호중 ( Ho Joong Youn ),김경하 ( Kyong Ha Kim ) 한국산림과학회 2014 한국산림과학회지 Vol.103 No.4
The objective of this study was to select a representative coastal disaster prevention forest type foreach coastal area. In this study, we used cluster analysis with the results obtained from investigation for densityof growing stock, tree height, DBH, and forest width and length of major coastal disaster prevention forestsdistributed in the west, the south, and the east coasts. The results showed that the coastal disaster preventionforests for each coast were classified into two types: a forest type with small DBH and high growing stockdensity (W1) or with high tree height (W2) in the west coast, a forest type with small tree height (S1) or withlarge DBH (S2) in the south coast, and a forest type with small growing stock density (E1) or with small treeheight and low DBH (E2) in the east coast. The coastal disaster prevention forests located in Gurye beach(Hwangchon-ri, Wonbuk-myeon, Taean-gun, Chungcheongnam-do) and in Gohsapo beach (Unsna-ri, Byeonsanmyeon,Buan-gun, Jeollabuk-do) were selected as the representative forests of W1 and W2, respectively. Inaddition, the coastal disaster prevention forests located in Namyang beach (Namyang-ri, Seolcheon-myeon,Namhae-gun, Gyeongsangnam-do) and in Donggo beach (Donggo-ri, Sinji-myeon, Wando-gun, Jeollanam-do)were selected as the representative forests of S1 and S2, respectively. Last, the coastal disaster prevention forestslocated in Bonggil beach (Bonggil-ri, Yangbuk-myeon, Gyeongju-si, Gyeongsangbuk-do) and in Anmeok beach(Gyeonso-dong, Gangneung-si, Gangwon-do) were selected as the representative forests of E1 and E2,respectively. Our finding is expected to be used as baseline data in establishing the most appropriate coastaldisaster prevention forest for each coast.