| Material component to non-linear relation between sediment yield and drainage network development:an flume experimental study |
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| 作者姓名： | JIN De-sheng CHEN Hao GUO Qing-wu |
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| 作者单位： | Institute of Geographic Sciences and Natural Resources Research，CAS，Beijing 100101，China |
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| 基金项目： | Joint project by National Natural Science Foundation of China and Ministry of Water Resources of China, No.59890200，National Na |
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| 摘 要： | 1 IntroductionThe drainage network is one of the important components in a fluvial system, as Schumm1] pointed out that three zones compose a typical fluvial system. As early as in the mid 20th century, Horton2] made a significant quantitative explanation to hydro-geomorphology in a drainage network system. Since the 1960s, Leopold and Langbein have studied the network structure with random walk and entropy, and Shreve, Smart and Scheideger have topologically studied network structure3-1…
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| 收稿时间： | 10 January 2001 |
| 修稿时间： | 20 May 2001 |
Material component to non-linear relation between sediment yield and drainage network development: an flume experimental study |
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| JIN De-sheng,CHEN Hao,GUO Qing-wu.Material component to non-linear relation between sediment yield and drainage network development:an flume experimental study[J].Journal of Geographical Sciences,2001,11(3):271-281. |
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| Authors: | Jin De-sheng Chen Hao Guo Qing-wu |
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| Institution: | Institute of Geographic Sciences and Natural Resources Research, |
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| Abstract: | This paper examines the experimental study on influence of material component to non-linear relation between sediment yield and drainage network development completed in the Lab. The area of flume drainage system is 81.2 m2, the longitudinal gradient and cross section slope are from 0.0348 to 0.0775 and from 0.0115 to 0.038, respectively. Different model materials with a medium diameter of 0.021 mm, 0.076 mm and 0.066 mm cover three experiments each. An artificial rainfall equipment is a sprinkler-system composed of 7 downward nozzles, distributed by hexagon type and a given rainfall intensity is 35.56 mm/hr.cm2. Three experiments are designed by process-response principle at the beginning the ( shaped small network is dug in the flume. Running time spans are 720 m, 1440 minutes and 540 minutes for Runs I, IV and VI, respectively. Three experiments show that the sediment yield processes are characterized by delaying with a vibration. During network development the energy of a drainage system is dissipated by two ways, of which one is increasing the number of channels (rill and gully), and the other one is enlarging the channel length. The fractal dimension of a drainage network is exactly an index of energy dissipation of a drainage morphological system. Change of this index with time is an unsymmetrical concave curve. Comparison of three experiments explains that the vibration and the delaying ratio of sediment yield processes increase with material coarsening, while the number of channel decreases. The length of channel enlarges with material fining. There exists non-linear relationship between fractal dimension and sediment yield with an unsymmetrical hyperbolic curve. The absolute value of delaying ratio of the curve reduces with time running and material fining. It is characterized by substitution of situation to time. |
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| Keywords: | material component network sediment yield nonlinear relation experiment |
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