PIANC Smart Rivers 2022

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Abstract : *(250~1000 words)

Ship wave is one kind of water surface wave created by water disturbing when ships move on the river or sea. Ship wave is an important hydrodynamic factor in river channel. There are some research results on the ship wave creating theory and wave height calculation formula from investigation and experimentation. With China's economic development, many river revetments adopt vertical structures in order to save land resources, which is invalid to ship wave attenuation. At the same time, some small ships with fast speed appeared in recent years, which could formed large Ship waves with height more than 1m. The ship waves superimposed with the waves of reflected by the vertical revetment, the wave height was very high and the wave often breaked, which seriously affect the navigation stability and cause bank scouring. In 2009, Nanjing Hydraulic Research Institute conducted field observation observation of Ship wave in Zhenjiang section and Yixing section of Sunan Canal, and collected the ship wave size data of nearshore generated by different types of ship under different speeds. The field observation show that the ship speed has a greater influence on the Ship wave than the ship size. After that, in the laboratory of NHRI, a canal channel model is constructed with a model scale of 1:20, the vertical wave dissipation revetment structure is simulated, too. The Ship wave is simulated by self-propelled ship model. Through the ship navigation test under different speed, the nearshore wave height is measured by sensor array, the effect of round hole caisson structure and grid structure for vertical revetment on wave dissipation is compared. By analyzing the influence of these two parameters, the rate of blank area with shape of round hole on the front of caisson, and the spacing size of grid structure on the front of caisson, on wave dissipation, the vertical wave dissipation revetment structural design is optimized through model test and calculation. Finally, a structural design scheme of how to reduce Ship wave on vertical revetment is put forward, which can be used as a reference for similar projects.

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