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임분의 생장효과가 GIS 응용 가시권 분석에 미치는 영향 분석
장광민 ( Kwang Min Jang ),송정은 ( Jung Eun Song ),설아라 ( A Ra Seol ),한희 ( Hee Han ),정주상 ( Joo Sang Chung ) 한국지리정보학회 2010 한국지리정보학회지 Vol.13 No.2
In this study, the effects of stand height growth on GIS-based viewshed analysis were investigated. DSM was created by combining stand height layers on DEM using map algebra functions. In developing the tree height layers, the digital forest-type maps, forest site maps and stand yield tables of Korea Forest Research Institute were used. The time horizon for viewshed analysis were 40 years. Two viewpoints in crossings of downtown for viewshed analyses were chosen using a projective mapping technique. The effects of tree height growth over time on visibility were measured in terms of the depth of blind areas and the area of visible regions. The results of viewshed analyses show that 17% of visible regions is reduced when we use DSM instead of DEM. As the tree height grows, the visibility gets worse and worse and the depth of blind area increases.
산림탄소축적을 고려한 국유림 장기경영계획 수립을 위한 CBM-CFS3 모델의 적용
장광민 ( Kwang Min Jang ),원현규 ( Hyun Kyu Won ),김영환 ( Young Hwan Kim ),탁광일 ( Kwang Il Tak ),신만용 ( Man Yong Shin ),이경학 ( Kyeong Hak Lee ) 한국산림과학회 2011 한국산림과학회지 Vol.100 No.4
Forest carbon stock changes in a national forest were assessed by CBM-CFS3 model with different management scenarios to support decision making for a long term forest planning. Management scenarios were composed with 4 different levels of timber harvesting - current harvesting level (scenario1), 30% increment in each period (scenario2), 3 times increment (scenario3), and 5 times increment (scenario4). For each scenarios, changes in total carbon stocks, carbon stocks of each carbon pools, carbon stocks of harvested wood products (HWP) and age class structure were estimated over 100-year planning horizon. The estimated total carbon stock including HWP at the end of final period (100 years) was 433.1 tC/ha under scenario 1, but the age class structure has skewed right to the upper classes, which is not desirable for sustainable forest management. Under the scenario 4, however, the total carbon stock decrease to 385.5 tC/ha and the area of old growth forest show a significant decline. The estimated total carbon stock under scenario 2 and 3 were 411.7 tC/ha and 410.5 tC/ha respectively, and it was able to maintain the initial level of the forest carbon stocks during the planning horizon. Also the age class structures under the scenario 2 and 3 were evenly distributed from class 1 to class 8. Overall, scenario 2 and 3 were the most acceptable forest management options, in terms of carbon stock changes and age class structure.
산림수확 시뮬레이터 HARVEST 응용에 의한 벌채지 공간배치 사례연구
송정은 ( Jung Wun Song ),장광민 ( Kwang Min Jang ),한희 ( Hee Han ),설아라 ( A Ra Seol ),정우담 ( Woo Dam Chung ),정주상 ( Joo Sang Chung ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.1
In this study, we used HARVEST, a timber management strategy assessment tool, to evaluate alternative forest planning strategies on spatial pattern of cutting blocks. We applied the tool to the Gwangreung Experimental Forest (GEF) as a case study. The harvest schedules developed for GEF using a linear programming model was used to assess spatial patterns of cutting blocks under different management constraints. The results show that the allowable maximum harvest size largely affects the number, size, and distribution of cutting blocks. We also found that spatial dispersion methods and adjacency constraints could be used as an effective means to control spatial allocation of cutting blocks in order to meet certain forest ecosystem management goals.
국내 장기목재공급 잠재력 예측을 위한 퍼지선형계획법의 적용
원현규 ( Hyun Kyu Won ),김영환 ( Young Hwan Kim ),이경학 ( Kyeong Hak Lee ),장광민 ( Kwang Min Jang ) 한국산림과학회 2010 한국산림과학회지 Vol.99 No.6
The objective of this study was to estimate potential of domestic long-term wood supply by using fuzzy linear programming (FLP). In order to construct a numerical formula model, maximization of total timber production was used for the objective function. Size limit of harvesting and sustained yield were used as the constraints. The results of comparison between LP and FLP were shown that LP is more suitable than FLP in terms of the amount of timber production and final forest stock. However, as long-term sustained yield was limitedly achieved by using LP, FLP was more desirable for prediction of potential wood supply. According to the results of this study, the potential of annual domestic wood supply was estimated about 10.5 million cubic meters. Gyeong buk, Jeon nam, Gangwon and Gyeong nam province were highly ranked in order of provincial potential of wood supply.
이병두 ( Byung Doo Lee ),원명수 ( Myoung Soo Won ),장광민 ( Kwang Min Jang ),이명보 ( Myung Bo Lee ) 한국지리정보학회 2008 한국지리정보학회지 Vol.11 No.1
Topography factors, as homeostasis variables at forest fire, affect the formation of fuel load patterns, atmospheric phenomena and forest fire behavior. Examination of the correlation between landforms and fire severity is important to decision making for fire hazard analysis and fighting strategies. In this study, fire severity was analyzed using Normalized Burn Ratio(NBR) derived from pre- and post-fire Landsat TM/+ETM images and landform were classified based on Topographic Position Index(TPI) in Samcheok(2000), Cheongyang(2002), and Yangyang(2005) forest fire regions. F-tests and Duncan`s multi-range test between landform and fire severity showed that fire severities of headwater, high ridges, and upper slopes is higher than ones of local ridges, midslope ridges, and plains. Fire severity were more sensitive in coniferous forest than broadleaf forests.