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http://dx.doi.org/10.14578/jkfs.2011.100.2.10

The Morphologic Characteristics of Step-pool Structures in a Steep Mountain Stream, Chuncheon, Gangwon-do  

Kim, Suk Woo (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Chun, Kun Woo (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Park, Chong Min (Department of Forest and Environmental Sciences, College of Agriculture and Life Science, Chonbuk National University)
Nam, Soo Youn (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Lim, Young Hyup (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Kim, Young Seol (Department of Forest Resources, College of Forest and Environmental Sciences, Kangwon National University)
Publication Information
Journal of Korean Society of Forest Science / v.100, no.2, 2011 , pp. 202-211 More about this Journal
Abstract
The geometric characteristics of step-pool structures and how they are influenced by channel characteristics were investigated in a steep mountain stream in the Experimental Forests of Kangwon National University in Chuncheon, Gangwon-do. Average values of steps for the study reaches were as follows: step spacing, 4.69 m; step height, 0.47 m; step drop, 0.71 m; step-forming particle sizes, 0.68 m; number, 21steps/ 100 m; the ratio of step spacing to channel width, 0.5; and step steepness, 0.13. Relationships between spacing and height of steps and channel gradient showed a negative- and positive correlation, respectively, whereas all geometric variables of steps manifested poor correlation with channel width. Therefore, step steepness, expressed as the ratio of step height to step spacing, increased as channel gradient increased. The ratio of step steepness to channel gradient representing the criterion of maximum flow resistance was 1.2, indicating the channel bed's stable condition. In particular, the relationship between the ratio of step drop to step height and channel gradient showed a significant negative correlation, suggesting the influence of step-pool geometry in trapping sediment and providing an aquatic habitat. Positive correlations also exist between spacing and drop of steps and step particles. Our findings suggest that the dynamics of step-pool structures may strongly control physical and ecological environments in steep mountain streams, so understanding them is essential for stream management.
Keywords
step-pool structures; geometric characteristics; channel gradient; channel width; particle size; mountain stream; Experimental Forests of Kangwon National University;
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