Co-scheduling model of Three Gorges-Gezhou Dam based on series queuing network

In order to increase the whole passing ability of Three GorgesGezhou Dam, a mathematical model on the co-scheduling problem of Three GorgesGezhou Dam was given out, based on the analysis of its actual needs, two objective functions to maximize the utilization ratio of lock chamber and minimize the whole navigation lock waiting time were considered, along with eight constraint conditions during ship arrangements, a scheduling algorithm based on series queuing network was put out.In the algorithm, declarated ships were divided into four sequences and each ship's weight was calculated, ship's length and width priorities, navigation lock waiting time constraints, the navigable constraints of Gezhou Dam navigation lock and task equalizing conditions were considered, circularly scheduling ships and plan's step-by-step optimizations were carried out.Applied result shows that making a two-dam-five-gate plan only needs 2 min, the lock chamber utilization ratio of Gezhou Dam's 2^# gate is higher than 70%, and passenger ship and touring ship are arranged to the front, the waiting time restriction of passenger ship is satisfied, ship up-and-down running courses are alternant, no converse course occurs, which indicates that the plan is quite effective according to practical application.