航道稳定航深计算是充分利用航道水深资源的前提条件,改进稳定航深的计算过程对估算航道水深潜力有重要的意义。为计算长江中游城陵矶—武汉河段航道最大稳定水深,改进了稳定航深估算法中的河相关系参数、水深修正系数及分流比计算过程,同时综合考虑分汊河段和非分汊河段的稳定航深,最后确定了城陵矶—武汉河段在不同流量、不同河宽下的稳定航深。研究结果表明:①通过构建城陵矶—武汉河段流量Q与河相系数α、形状系数k、河相指数β、河宽B的经验关系,可简化改进稳定航深估算法的稳定航深计算过程。②城陵矶—武汉河段在98%设计通航保证率流量下,150、200、250 m航宽尺度下基于自然禀赋的稳定航深分别为5.98、5.64、5.30 m;在20 000 m3/s流量下,150、200、250 m航宽尺度下的稳定航深分别为12.56、11.89、11.22 m;在30 000 m3/s流量下,150、200、250 m航宽尺度下的稳定航深分别为16.81、16.16、15.49 m。
Abstract
Estimating the maximum stable navigation depth of waterway is a prerequisite for optimizing the utilization of water depth resource. Enhancing the process of calculation holds significant importance in evaluating waterway depth potential. To ascertain the maximum stable waterway depth of Chenglingji-Wuhan section of the middle reach of Yangtze River, we refined the processes of calculating river phase relationship parameter, waterway depth correction coefficient, and split ratio in the estimation method. In consideration of both branching and non-branching river sections, we determined the maximum stable waterway depth of Chenglingji-Wuhan section under various flow rates and river widths. Key findings include: 1) The process of calculating stable waterway depth can be simplified and improved by establishing the empirical relations of flow rate Q against river phase coefficient α, shape coefficient k, river phase index β, and river width B. 2) At a design navigation guarantee rate of 98%, the stable waterway depths of Chenglingji-Wuhan section based on natural endowments are 5.98, 5.64, and 5.30 meters for navigation widths of 150, 200, and 250 meters, respectively. At a flow rate of 20 000 m3/s, the stable waterway depths with the same navigation widths are 12.56, 11.89, and 11.22 meters, while for a flow rate of 30 000 m3/s, these values are 16.81, 16.16, and 15.49 meters.
关键词
稳定航深 /
改进计算 /
河相关系 /
水深修正系数 /
分汊河段 /
长江中游
Key words
stable navigation depth /
improved calculations /
river phase relationship /
water depth correction coefficient /
branching river section /
middle reach of Yangtze River
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基金
长江航道局科研项目(2022230001);长江航道规划设计研究院自主立项科研项目(2022-L-02)
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