Improvement of the Calculation Method for Stable Navigation Depth of Chenglingji-Wuhan Section in the Middle Reach of Yangtze River
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 correc-tion 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 indexβ,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.
stable navigation depthimproved calculationsriver phase relationshipwater depth correction coeffi-cientbranching river sectionmiddle reach of Yangtze River
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