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전근우(Kun Woo Chun),김민식(Min Sik Kim),박완근(Wan Geun Park),강기차부(Tsugio Ezaki) 한국산림과학회 1997 한국산림과학회지 Vol.86 No.1
The purpose of this study is to acquire essential data to reduce the amount of woody debris resulted from the debris flow. This research examined topographic characteristics of the channelbed affecting generation, movement and storage of woody debris and woody characteristics related to number, sizes, shapes, decay, storage direction to mountainous stream. 1. The number of woody debris had a tendency to increase in proportion to stream width, but it was hardly affected by longitudinal gradient of stream. Especially, the greater amount of woody debris was stored at wide section of the stream with compound channel, and it was found in deposits of channelbed rather than in the present channel. 2. Total woody debris over 10㎝ in diameter and over 2m in length was 402 units and storage number was 35.3 units per 100m of stream. Average diameter of breast height and length were 14㎝ and 4m, respectively. The woody debris appeared shorter in length and greater in diameter at downstream than up-stream. 3. Since woody debris met sediments and bed-materials of great roughness in moving, the greater amount of woody debris without root was found in up-stream and down-stream, but deformed woody debris was discovered in upper stream. Decay of woody debris was more severe in downstream and woody debris on rotting process was found down-stream. 4. Storage direction of woody debris was mainly parallel to center line of stream, and rate of parallel and perpendicularity was 276 and 126 units, respectively. But, as woody debris storing to the perpendicular direction was unstable, the traveling debris could easily be stored. Therefore, some counterplan was required to prevent the traveling woody debris. 5. Tree species of woody debris was mainly larch, which occupied about two third of total woody debris(256 units). The woody debris of larch is easy to move due to hitting of channelbed materials or lower channelbed fluctuation because the lower part of larch is weaker than its upper part. Therefore, the section of the tree species planting in the riparian vegetation needs much more carefulness.
임도개설이 계류수질에 (溪流水質) 미치는 영향 - 임도개설에 따른 부유토사량의 (浮遊土砂量) 변화 -
전근우(Kun Woo Chun),김민식(Min Sik Kim),강기차부(Tsugio Ezaki) 한국산림과학회 1996 한국산림과학회지 Vol.85 No.2
This study was carried out to investigate the export rate of suspended sediment by different precipitation intensity after forest road construction for torrential streams on three different watersheds with various forest road density(Watershed A : 6.67m/㏊, Watershed B : 5.52m/㏊, and Watershed C : control) in the Experimental Forest of Kangwon rational University. The results were as follows. 1. Closely related to the the amount of rainfall in both 1994 and 1995, the average streanfkiw rate was less than 0.25 × 10⁴㎥/day during May and June and 5.0 × 10⁴㎥/day during July and August. More than 25 × 10⁴㎥/day of streanflow rate was occurred twice in 1994 and seven times in 1995. 2. The amount of suspended sedimeant in three watersheds was less than standard of drinking water(25㎎/ℓ) before road construction with daily rainfall of 74㎜, 92㎜, and 120㎜ in 1994, also after road construction with daily rainfall of 21㎜ and 47㎜ in 1995. But, under the 192㎜ of daily rainfall, Watershed C did not show the difference in the amount of suspended sediment, however, Watershed A and B produced 1,525㎎/ℓand 775㎎/ℓ, respectively, which is 61 and 31 fold of stabdard of drinking water, and construction to export for 35 hours after rainfall. 3. The maximum amount of suspended sediment was less than the standard of drinking water with light rainfall before and after road construction. Under the 192㎜ of daily rainfall, the maximum amounts of suspended sediment in Watershed A and B were 13,150㎎/ℓ and 2,690㎎/ℓ, of 526 and 108 fold of standard of drinking water, respectively, showing obvious water pollution by sedimentation. Results of the study indicated that the forest road construction had great influence on the sedimentation, and getting increased by higher road density and heavier rainfall. Therefore such practices as vegetation covering and soil erosion control facility should be established accompanying with forest road construction to prevent from sedimentation.