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http://dx.doi.org/10.3741/JKWRA.2018.51.3.235

Identification of vulnerable region susceptible to soil losses by using the relationship between local slope and drainage area in Choyang creek basin, Yanbian China  

Kim, Joo-Cheol (International Water Resources Research Institute, Chungnam National University)
Cui, Feng Xue (Yanbian Water & Electricity Survey Designing Research Institute)
Jung, Kwan Sue (Department of Civil Engineering, Chungnam National University)
Publication Information
Journal of Korea Water Resources Association / v.51, no.3, 2018 , pp. 235-246 More about this Journal
Abstract
The main purpose of this study is to suggest a methodology for identifying vulnerable region in Choyang creek basin susceptible to soil losses based on runoff aggregation structure and energy expenditure pattern of natural river basin within the framework of power law distribution. To this end geomorphologic factors of every point in the basin of interest are extracted by using GIS, which define tractive force and stream power as well as drainage area, and then their complementary cumulative distributions are graphically analyzed through fitting them to power law distribution to identify the sensitive points within the basin susceptible to soil losses with respect to scaling regimes of tractive force and stream power. It is observed that the range of vulnerable region by scaling regime of tractive force is much narrower than by scaling regime of stream power. This result seems to be due to the tractive force is a kind of scale dependent factor which does not follow power law distribution and does not adequately reflect energy expenditure pattern of river basins. Therefore, stream power is preferred to be a more reasonable factor for the evaluation of soil losses. The methodology proposed in this study can be validated by visualizing the path of soil losses, which is generated from hill-slope process characterized by local slope, to the valley through fluvial process characterized by drainage area as well as local slope.
Keywords
Soil losses; Power law distribution; Local slope; Drainage area; Tractive force; Stream power;
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Times Cited By KSCI : 2  (Citation Analysis)
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