基於床沙位置分佈特性的推移質輸移規律研究

BED LOAD TRANSPORT LAW BASED ON THE DISTRIBUTION CHARACTERISTICS OF BED SEDIMENT POSITION

許曉陽(Xiao-Yang Xu) ； 張根廣(Gen-Guang Zhang) ； 周雙(Shuang Zhou)

《中國土木水利工程學刊》 34卷2期 (2022/04) Pp. 129-136

https://doi.org/10.6652/JoCICHE.202204_34(2).0003

摘要

推移質輸沙率計算對河流動力學的理論發展及水利工程的實際應用具有重要意義。為進一步完善推移質輸移理論，本文引入暴露高度和暴露角的概念，並通過隨機分佈試驗統計二者的分佈規律，結果表明，二者均服從正態分佈；基於水流條件的隨機性和床沙位置的分佈規律，採用概率論與力學分析相結合的方法，推導了泥沙沖刷概率公式，並借鑒Einstein推移質輸沙率的修正基本模型，建立新的推移質輸沙率公式。經實測資料的驗證及與經典的推移質輸沙率公式和基於同理論的推移質輸沙率公式進行對比分析，表明本文公式具有更加清晰的物理概念及更高的計算精度。

關鍵字

均勻沙 ； 床沙位置分佈 ； 沖刷概率 ； 推移質輸沙

並列摘要

The calculation of bed load sediment transport rate is of great significance to the theoretical development of river dynamics and the practical application of water conservancy projects. In order to further improve the load transfer theory, this paper introduces the concepts of exposure height and exposure angle, and calculates the distribution law of the two through random distribution experiments. The analysis results show that both of them obey the normal distribution. Based on the randomness of water flow conditions and the distribution law of sediment position, the method of combining probability theory and mechanical analysis is used to derive the probability formula of entrainment probability. Using the modified basic model of Einstein's bed load sediment transport rate for reference, a new bed load sediment transport rate formula is established. The verification of measured data and the comparison with the classic bed load sediment transport rate formula and the bed load sediment transport rate formula based on the same theory show that the formula in this paper has a clearer physical concept and higher calculation accuracy.

並列關鍵字

uniform sediment ； position distribution of sediment particles ； entrainment probability ； bed load sediment transport

參考文獻

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