PIANC Smart Rivers 2022

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Abstract : *(250~1000 words)

Zhe-Gan-Yue navigation channel is a major cross-basin navigation channel in the latest national inland waterway development plan. The Changshan River, located in the upstream of Qiantang River, is an important part of the Zhe-Gan-Yue navigation channel， which is already listed in The "14th Five-Year Plan" for the Development of Modern Comprehensive Transportation System. Changshan River 3rd class waterway, 51km long, plans to construct 6 dams for waterway regulation. It is predicted that the maximum amount of one-way cargo would reach 18 million tons per year in 2050. By the study in early-stage, each of the 6 dams plans to build one lock with a class Ⅲ. The effective size of the lock is 180m×23m×4.5m, and the capacity of the lock is 18.5 million tons per year. The Changshan River is meandered, with 150m~250m width. It is hard to determine the location of the dam and the layout of the locks. And for each lock, it lacks the general conditions to reserve for the secondary lock, or the construction for the reserved secondary lock would cost too much. With the implementation of the strategy - China’s strength in transportation in the future, the negative social and economic impact caused by lock close due to the maintenance or accident could not meet the requirement of the high-quality transportation development. Thus, it is necessary to research how the ships pass through when the locks closed. This article came up with the innovative plan for letting one dam gate allows both the ship pass through in case of emergency and floodwater release in flood period. Also, comprehensive research was carried out including numerical simulation and physical model. This article introduced the result of research for the emergency lock, including the lock scale and design standard, the scheduling, the layout of the lock, the water delivery system, the water flow for passing through, the flood impact on the lock, and the physical model test. By study, one dam gate was used as the emergency ship lock, and it was designed to be embedded right close to the main lock. By setting the water delivery system under the bottom plate of the lock and in the sidewall of the lock chamber longitudinal, and using branch holes on sidewall to outlet the delivered water, the emergency lock minimally occupied the width of the river. This design meets the requirement for both flood protection and emergency navigation, also it could be part of the expansion of the lock.

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