分形下的河道演变初探——以尼洋河为例
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摘要
以尼洋河为例运用分形算法探讨了河道演变的机理,初步认为:在河道演变分类的基础上,河道演变是河道外部条件和河道内部条件不断协调的结果,即演变主要依靠水力和携砂两个关键因素。具体到尼洋河来说是渐进式演变与急剧式演变相结合的河道演变,其渐进式演变主要由于携砂带来河势演变,其急剧式演变主要是由于水位落差或流量增大引起的纵向和横向演变。
After mechanism of riverbed evolution was discussed by a case study at Niyang River used Fractal,and the conclusion was that riverbed evolution was the results of continuous coordination between conditions of external and internal based on the classification of riverbed evolution,the riverbed evolution depended on two key factors of hydraulic and sand-carrying.Niyang River is the combination of progressive evolution and dramatic evolution,and its progressive evolution is riverbed evolution by sand-carrying and its dramatic evolution is horizontal and vertical evolution by water level difference and flow increment.
After mechanism of riverbed evolution was discussed by a case study at Niyang River used Fractal,and the conclusion was that riverbed evolution was the results of continuous coordination between conditions of external and internal based on the classification of riverbed evolution,the riverbed evolution depended on two key factors of hydraulic and sand-carrying.Niyang River is the combination of progressive evolution and dramatic evolution,and its progressive evolution is riverbed evolution by sand-carrying and its dramatic evolution is horizontal and vertical evolution by water level difference and flow increment.
引文
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[6]黄润生,黄浩.混沌及其应用[M].武汉:武汉大学出版社,2005.
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