Key Parameters Design of Emergency Duty Tugboat in the Yangtze River

During the main flood season of the Yangtze River, the water flow conditions in the navigation section between the Three Gorges and Gezhouba will rise, resulting in an increase in the risk of ship deviating from voyage route or ship crash. These risk events affect the safe operation of Gezhouba. To ensure the safe operation of Gezhouba Dam, it is necessary to set up emergency tugboats to deal with the risk of ship deviation from voyage route or ship collision with the dam. Based on the analysis of the characteristics of Gezhouba lock passing ship, the risk classification of ship emergency is carried out, and the key water areas of medium and high-risk events are determined. Based on the characteristics of lock passing ships, types of risk events and the timeliness requirements of rescue in key waters, the functional configuration suggestions of the emergency duty tugboat in the upstream of Gezhouba are put forward which include ship speed, power, and salvation function.