【摘要】 在分析汉江中下游以及荆江河湾实测资料的基础上,阐述了河湾水流动力轴线弯曲半径变化与切滩撇弯之间的关系,大量相关实测资料说明当河湾的来水条件和河湾形态发生变化时,会造成河势与水流动力轴线走向发生变化,从而引起切滩撇弯的发生。用多元线性回归的方法拟合出河湾水流动力轴线弯曲半径的数学表达式,并提出了用水流动力轴线弯曲半径与河湾弯曲半径的相对值来判断切滩撇弯发生机率的方法。研究成果对于治河防洪工程的规划设计有一定参考价值。更多还原

【Abstract】 Based on field data of the river bend in middle and lower Hanjiang River and in Jingjiang River,the relation between the variation of bend radius of flow dynamic axis and bend bypassing and shoal cutting is expounded.A great number of field data show that if income flow and bend conformation change,the river regime and the direction of flow dynamic axis will change as well,then bend bypassing and shoal cutting will occur.A mathematical expression about the radius of flow dynamic axis was obtained by multiple linear regression,the contrast relation which is used to judge the occurrence probability of bend bypassing and shoal cutting between the radius of flow dynamic axis and the radius of bend was proposed.The research may be helpful in layout of river regulation and flood control.更多还原