When channel work is built in the erosion control project, the river bank and/or the river bed is usually made by hard material. This created a large opened and monotonous space in a torrent, resulting in deterioration of stream ecosystem.
In order to conserve an ideal environment, riparian trees, providing shade, spawning condition, litter, etc., should be conserved. Thus, the effective method to conserve and maintain the riparian trees in the erosion control project area should be developed. This study focused on the cross-sectional microtopographies as a foundation of growing vegetation and tha effect of the riparian trees in reducing the bank erosion during flooding time.
Finally, the procedure to conserve torrential areas were proposed from the view points of both the disaster prevention and the environment preservation.
