Study On The Shape Of The Stable Section Of The Beijing Hangzhou Canal And Its Application

Unlike natural waterways,the canal is closely related to ship navigation because of the narrow surface of the water surface,the small section coefficient and the influence of the bank protection.The shape and evolution of the channel section are particularly important for the construction and maintenance of the waterway.On the one hand,it affects the construction and maintenance of the waterway.On the other hand,it affects the ability of the channel to pass.Therefore,it is of theoretical significance and practical value to study the morphology of channel stable section.The evolution characteristics of the section of the Jiangsu section of the Beijing-Hangzhou canal are analyzed in this paper.At the same time,the influence of the development of large scale ships on the shaping of restricted channel sections is also discussed.Based on the minimum energy consumption rate of natural rivers,the influence of the ship’s hydrodynamic factors on the restricted waterways was added,and the minimum energy equation of the canal waterway was deduced.On the basis of constructing the functional extremum problem of the navigation canal and stabilizing the section shape of the channel,the shape equation of the stable section of canal channel is derived by the variational method.Based on the stability section shape equation,the equilibrium water depth of the waterway was explored.Based on the related theories of navigation standards,energy saving and emission reduction and navigation,considering the development of the ship’s large scale,the standard water depth of the standard ship and the actual ship model are explored respectively.Taking into account the balance of water depth and standard water depth,the depth of navigation channel maintenance for the Beijing-Hangzhou Canal is determined.Based on the shape of the stable section,a benefit-cost model under different maintenance depth conditions was established.The most economical maintenance depth was determined by using the benefit-cost ratio.The relationship between the deposition depth and the maintenance period under this depth condition was studied in this paper.Examples of multiple segments of the Beijing-Hangzhou Canal are analyzed and calculated.The results show that this method is practical and feasible.