船闸口门区通航水流条件中的横向流速指标是衡量船舶能否安全进出引航道口门区的主要标准之一。通过对位于弯曲河段的水利水电枢纽工程资料的收集分析，发现存在口门区局部区域流速测点横向流速超过规范限值，但船模航行参数符合要求的现象。针对这一问题，以大源渡航电枢纽二线船闸口门区通航水流条件模型试验和船模航行试验为基础，研究弯曲河段口门区船舶航行的特点，分析2种试验结果的差异，提出了在衡量弯曲河段船闸口门区通航水流条件时应考虑船舶航行存在艏向角的因素，以及船舶的有效横向流速应与规范中的限值进行比较的建议。

Transverse velocity, indicating the flow condition in the entrance area of ship lock, is a major index determining the safety of ships entering or exiting the entrance area. Through collecting and analyzing the data of hydraulic engineering and hydropower project in curved reach, the transverse velocity at some measurement points in the entrance area are found to be exceeding standard limit while ship model navigation parameters could meet requirements. In view of this, we conducted model test of navigation flow condition and ship model test for the second ship lock of Dayuandu navigation and electricity junction. We analyzed the characteristics of ship navigation in the entrance area of the curved reach and investigated the differences between the two test results. We propose to take the heading angle of ship navigation into consideration in research of navigation flow conditions at the entrance area of ship lock in curved reach. We also recommend to compare the effective transverse velocity which is relative to the ship with standard values.