산사태지의 식생 회복과정에 관한 기초적 연구 - 용인 · 화성군지역을 대상으로

우보명(Bo Myeong Woo),전기성(Gi Seong Jeon),최형태(Hyeong Tae Choi),정도현(Do Hyun Jeong) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.1

The purpose of this study was to analyze the process of natural plant establishment and revegetation on the slopes of landslide scars, both untreated(l4 plots) and treated plots (14 plots) with rehabilitation measures in 1993 and 1994 at Yongin·Hwaseong-gun region. While total of 61 species were identified at surveyed sites. in the region, the pioneer species on landslide scars were Lespedeza cyrtobotrya, Arundinella hirta, Artemisia princeps, Pteridium acquilinum, Erigeron canadensis. Rubus crataegifolius, Stephanandra incisa etc. The species diversity (H`) and evenness(E`) of the untreated scars were greater than those of the treated scars. Similarity indices in the untreated scars were higher than those in the treated scars, and succession indices showed similar value in both areas. As a conclusion, this study shows that the untreated scars were more influenced by the around-vegetation, and the native vegetations(plants) like Lespedeza cyrtobotrya, Arundinella hirta. Miscanthus sinensis, Artemisia princeps, Pteridium acqutlinum, Erigeron canadensis. Rubus crataegifolius, Stephanandra incisa ete. could be more effectively used as plant vegetation for rehabilitation of landslide scars.

성숙임목벌채지에서 (成熟林木伐採地) 항우수의 (降雨水) 표면유출량과 산지침식에 (山地浸蝕) 미치는 환경요인의 영향

우보명(Bo Myeong Woo),박재현(Jae Hyeon Park),전기성(Gi Seong Jeon),정도현(Do Hyun Jeong) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.2

This research was conducted to investigate the influential factors of the runoff of water and hillslope erosion caused by the large - scale harvesting operation. It was carried out on harvested sites (13㏊) and non - harvested sites(13㏊) in Seoul National University Research Forest [(Mt.) Paekunsan] , from 1993 to 1994. 1. The amount of runoff of water was increased as the unit of rainfall increases, and the amount of runoff on harvested sites was larger than that of non - harvested sites by 28% in the first year and 24.5% in the second year after harvesting. According to the multiple regression equation for surface runoff, unit and number of rainfall, amount of hillslope erosion and soil bulk density showed statistically significance(R²=0.91). 2. The amount of hillslope erosion on harvested sites was larger than that of non - harvested sites by 7 times during the first year of harvesting and 2 times during the second year. 3. The multiple regression equations for hillslope erosion showed that soil bulk density, surface runoff of water and unit of rainfall(these factors were not controllable) had statistically significance(R²=0.74). 4. Soil runoff in harvested and non harvested sites were maximum 6.7% and 1% of the amount of hillslope erosion, respectively during the first year of harvesting. And the second year of harvesting soil runoff in harvested and non harvested cites were maximum 5.7% and 1.9%of the amount of hillslope erosion. From the above results, when in planning for timber harvesting, the buffer strip - woods zone must be remained to diminish soil and water runoff and to preserve water quality.

야계의 (野溪) 월류발생에 (越流發生) 관한 연구 - 관악산 삼성천에서의 시험사례 -

우보명,김경하,정도현 ( Bo Myeong Woo,Kyong Ha Kim,Do Hyeon Jeong ) 한국산림과학회 1988 한국산림과학회지 Vol.77 No.3

To investigate the cause of overflow in the torrential stream, the estimated peak flow of run-off and the maximum tarring capacity of the stream were measured at the upstream of Samsung-cheon located in Kwanak Aboretum during July, 1987. The results obtained from this study could be summarized as follows 1. The surveyed catchment area was 477㏊, which was 116 of the designed area (410㏊) by the plan. 2. The maximum rainfall intensity measured was 99.5㎜/hr and was almost same as the designed intensity (100㎜/hr) . 3. The surveyed run-off coefficient was 0.672 that was about twice as much as designed one(0.35). 4. The surveyed peak flow of run-off was 88.59㎥/sec, 222% as large the designed one(39.9㎥/sec). 5. The designed cross-sectional area of the stream was 17.25㎡, which was 68% of the designed one 125.43㎡. 6. The surveyed hydraulic mean radius was 0.94m, which was shorter than the designed one(1.28m). 7. The surveyed mean stream-bed gradient(0.998%) was almost the same as the designed one(1.00%). 8 The surveyed maximum velocity of flow passing through the stream was 2.87m/sec, 78.0 of the designed one(3.68m/sec). 9 The surveyed run-off capacity of the stream was 49.51㎥/sec, 53% of the designed one (93.5㎥/sec).

성숙임목벌채지에서 (成熟林木伐採地) 운재로의 (運材路) 침식에 (浸蝕) 미치는 환경요인의 영향

박재현(Jae Hyeon Park),우보명(Bo Myeong Woo),정도현(Do Hyun Jeong) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.2

This research aimed at the contribution to obtaining the scientifical data which were required for planning she environmentally sound and sustainable management, particularly in the field of the logging road construction. Main natural environmental variables including natural vegetation, rainfall, soil runoff were measured in the logging road on-sites and analysed. This project was carried out at the (mt.)Paekunsan Research sorest of Seoul National University, located in Gwangyang. Chollanam - do in southern part of Korea, from 1993 to 1994. 1. The explanatory variables for erosion and sedimentation on logging road surface were accumulated rainfall, erosion distance, cross - sectional gradient, and soil hardness. The erosion and sedimentation on logging road was increasing positively in proportion to the accumulated rainfall, soil distance from starting point of the logging road, and cross - sectional gradient. 2. On cut - slope of logging road, cut - slope shape, part of the slope, plant coverage, soil hardness, sand content, accumulated rainfall, clay content, and silt content were effective factors. Cut - slope erosion and sedimentation on logging roam increased as with the lower plant coverage, the lower accumulated rainfall, the high sand content in the soil. 3. On fill - slope of logging road, there were three significant variables such as total rainfall and number of rainfall - storm. Fill - slope erosion and sedimentation had a positive .correlation with the amount of rainfall, the number of rainfall, the soil hardness. 4. The total erosion and sedimentation on logging road were 5.04 × 10^(-2)㎡/㎡ in logging road construction year, 7.37 × 10^(-2)㎡/㎡ in next year. The erosion and sedimentation on logging road surface were 32.7% of total erosion and sedimentation on Logging road in construction year, and 57.1% in next year, respectively. The erosion and sedimentation on cut - slopes were 30.4% on logging road in construction year, fill - slopes of total erosion and sedimentation and 21.0% in next year, respectively. The erosion and sedimentation on fill - slopes were 36.9% on logging road in construction year, 21.9 in next year. To decrease the erosion and sedimentation at the logging road from the beginning stage of construction, the effective revegetation works should be implemented on the cut - slope and fill slopes, and erosion control measures such as optima. road design must be constructed on read surface.

林道構造 및 立地要因이 側溝浸蝕에 미치는 影響에 관한 硏究 : Influences of Forestroad Structures and Site Factors on Side-ditch Erosion

禹保命,鄭道鉉 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.1

To investigate the influence of some factors related with road structures and site characteristics on side-ditch erosion of the forest road, four forest roads elapsed from one to four years after construction were selected and surveying points were set up at intervals of 20m from beginning of each side-ditch of each road. Data consisting of 13 factors related with road structures and site characteristics on side-ditch erosion were collected from each surveying point and analysed by correlation and multiple regression method. The major results obtained from this study are summarized as follows; 1. Averages of side-ditch erosion in each forest road were 12.6m/㎞ at the forest road constructed in 1987, 31.6m/㎞ at that in 1986, 30.2m/㎞ at that in 1985, and 39.6m/㎞ at that in 1984. 2. The data analysis of each road showed that the distance from beginning of side-ditch and longitudinal gradient of side-ditch were highly correlated with side-ditch erosion. 3. With increasing time after construction, side-ditch erosion tended to increase. 4. According to the integrated analysis of 375 surveying points, the distance from beginning of side-ditch, longitudinal gradient of side-ditch, and years after construction were significant to explain the variance in order of their relative contribution in side-ditch erosion. 5. By the estimation of discrimination ability, erosional condition on the basis of allowable quantity in side-ditch erosion was classified.

土工을 中心으로 한 林道網 配置 計劃에 關한 硏究 : 白雲山 演習林 地區를 對象으로 Application in Mt. Baekwoon Research Forest

鄭道鉉,禹保命,李峻雨 서울대학교 농과대학 농업개발연구소 1992 서울대농학연구지 Vol.17 No.2

This study was aimed at determining the rational forest road networks in mountainous terrain forests by using the developed computer model. The computer model used for this study is composed of two major subroutines for digital terrain analysis and road-route selection, and the road-route selection subroutine uses the area-partitioning method in order to fully investigate alternative roading routes and to determine the layout of forest roads. The developed computer model was applied to designing a road network for the Research Forest of Seoul National University. The forest having an area of about 11,000 hectares is located in Mt. Baekwoon region of Kwangyang-gun and Gurye-gun in Chulanam-do. To evaluate the optimality of the determined road networks in this study, such factors as the average skidding distance, accessibility to forest stands, development index and circulated road network index were measured. The results of the optimality analysis of the road network is good and practicable.