Study On Ship Evacuation And Recovery Scheduling In Pearl River Estuary Under Extreme Weather

In recent years,under the influence of global climate change,extreme bad weather(cold wave,storm,typhoon,etc.)occurs frequently at sea.Among them,typhoon weather is the main bad weather affecting the waters of the Pearl River Estuary,which will bring extremely adverse effects on the operation of ships entering and leaving the port.It is an important reason for ship delay and will lead to great losses in ship operation.At present,the evacuation scheduling of ships in the Pearl River Estuary under typhoon weather is based on the premise of safety and the principle of first come first served(FCFS)to arrange ships to evacuate as soon as possible without considering the evacuation cost.However,the recovery scheduling of ships is based on the FCFS principle,which does not consider the total time of ship recovery,tug cost and economic loss of the whole port.In order to reduce the tug cost,the paper constructs a single objective optimization model of ship evacuation scheduling,which aims at minimizing the tug cost,on the premise of ensuring safety.In view of the problems existing in ship recovery scheduling,this paper constructs a multi-objective optimization model of ship recovery scheduling aiming at minimizing the overall recovery time,total delay time and tug cost.Considering economic benefits,the paper constructs a single objective optimization model of ship recovery scheduling aiming at minimizing the total delay economic loss.Through these two models to improve the recovery efficiency,reduce the tug cost and reduce the economic loss of ship delay.Taking typhoon Aiyunni as the research object,an adaptive neighborhood search algorithm is designed to solve the single objective optimization model,and a multi-objective genetic algorithm based on NSGA-III is designed to solve the multi-objective optimization model.Compared with the results of FCFS based scheduling model and stochastic scheduling model,the evacuation scheduling model constructed in this paper can reduce the cross regional navigation cost by more than 70%,and the recovery scheduling model based on time and cost can reduce the cross regional navigation cost by more than 65%,and the overall recovery time by more than 13% The economic loss of total delay can be reduced by more than 5%.Therefore,the model of ship evacuation scheduling in extreme weather can reduce evacuation cost under the premise of ensuring safety.The model of ship recovery scheduling can reduce the recovery cost,reduce port loss and restore port order as soon as possible.The research results of this paper have higher practical application value and reference value for the evacuation and recovery scheduling of ships in the Pearl River Estuary under extreme weather,and also supplement the theoretical research of ship evacuation and recovery scheduling in extreme weather,which has certain theoretical significance.