PIANC Smart Rivers 2022

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The lock capacity is an important technical and economic index to determine the scale of lock. It is an important research content in the planning and design of lock. The accuracy of its calculation results will directly affect the rationality of lock design simulation and design scale.
The lock capacity is defined as the gross deadweight tonnage of ships passing through the lock and the cargo volume passing through the lock in the design level year in China’s “Code for Master design of Ship lock”
The gross deadweight tonnage of ships passing the lock refer to the sum of deadweight tonnage of all ships passing the lock in a year under the conditions of predicted ship type combination, ship passing efficiency and navigation time, which is the capacity under ideal conditions.
The calculation of cargo volume passing through the lock should also consider non cargo factors, ship loading rate and operation imbalance, so as to obtain the sum of the actual cargo volume passing through the lock in one year.
There are many factors affecting the lock capacity, including ship size and ship type combination, navigation speed of ships entering and leaving the lock, ship spacing, lock filling and discharging time, gate opening and closing time, dimension of lock chamber, navigation days, ship loading rate, traffic volume imbalance, daily working time, etc. The calculation of lock capacity is a very complex work.
The simulation research of lock capacity refers to the method of analyzing the lock capacity by building a simulation model based on the system simulation theory and using the scheduling algorithm and optimization algorithm.
In the simulation model, the ship's random arrival at the lock and the distribution proportion of ship type can be simulated, so as to realize the random process of ship passing through the lock and simulate the ship passing scheduling rules. Compared with the methods of manual calculating the lock capacity according to the code, the simulation method is more objective and scientific.
In the simulation analysis of lock capacity, the two ship operation parameters of ship entry and exit speed and start-up interval have strong randomness.
This paper studies the rationality of the parameters of these two models by constructing the simulation model of lock capacity system.
The simulation test shows that with the increase of randomness of ship entry and exit speed, the passing capacity of ship lock decreases gradually, but this decrease can be ignored in engineering design. The randomness of the starting interval has no obvious effect on the carrying capacity of the ship lock.
Therefore, it is reasonable to take the average value of the model parameters when using the system simulation method to determine the navigation capacity of the lock, and considering all factors comprehensively, it is recommended to take the average value of the parameters in the modeling.

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