摘要
基于对长江上游宜宾至重庆主城区河段25个主要弯道平面形态特征的统计分析,研究弯曲河段扩宽率、收缩率、弯曲度、弯道中心角、曲颈河宽与平均河宽比、弯顶中心半径与平均河宽比等特征值的变化规律。结果表明：在平面形态上,大部分弯道呈现两头窄、中间宽的形态特征,部分弯道急剧弯曲、展宽凹陷非常明显;弯道中心角一般在60°~130°范围内,且大部分弯道中心角≥90°;大部分河湾的弯曲度〉1.2。分析弯道平面形态的形成机理和碍航特点。研究成果对港航工程、水利工程、市政工程和生态环境工程等的规划和建设具有参考价值。
Based on the analysis of the plane configuration characteristics of 25 main curved channels m Yibin-Chongqing reach of the upper Yangtze River, we probes into the changing rules of characteristic parameters as follows： the curved reach expanding rate, shrinkage rate, bending, bend angle at centre, ratio between swan river width and average river width, ratio between radius of center at curved top and average river width of characteristic value change rule. The results show that most curved channels are narrow at both ends and wide in the middle part, some curved channels are sharp bend and very apparent broadening and sag; the bend angles in the centre are between 60~and 130~, and most bends＇ central angle is greater than or equal to 90 o; the sinuosity of most curved channels is over 1.20. The navigation-obstructing characteristics and forming mechanism of the bend plane morphology are also analyzed. The above results may serve as reference for the planning and construction of port and waterway engineering, hydraulic engineering, municipal engineering and ecological engineering, etc.
出处
《水运工程》
北大核心
2015年第6期87-92,共6页
Port & Waterway Engineering
基金
国家自然科学基金(51079165
51479015)
关键词
长江上游
弯道平面形态
弯道浅滩
碍航特性
upper Yangtze River
curved channel plane configuration
bend shoals
navigation- obstructing characteristics
作者简介
王梅力（1991-）女，硕士研究生，从事GIS与数字航道研究。
