The Changjiang River diluted water (CDW) spreads into the East China Sea (ECS) primarily in a plume pattern, although in some years, low-salinity water lenses (LSWLs) detach from the main body of the CDW. In-situ observations indicate that in August 2006, a LSWL detached from the main body of the CDW near the river mouth. In this paper, the effects of winds, tides, baroclinity and upwelling on LSWLs are explored with a three-dimensional model. The results show that: (1) winds play a crucial role in these detachment events because wind-induced northerly Eulerian residual currents impose an uneven force on the CDW and cut it off, thus forming a LSWL; (2) upwelling carries high-salinity water from the lower layer to the upper layer, truncating the low-salinity water tongue vertically, which is conducive to the detachment and maintenance of LSWLs; and (3) upwelling during the evolution of a LSWL is caused by the combined effects of winds and tides. The influences of wind-induced upwelling are mainly near the shore, whereas the upwelling along the 30 m isobath is predominantly affected by tides, with the effect increasing from neap tide to spring tide.

长江稀释水（CDW）主要以羽状形式扩散到东海（ECS），尽管几年来，低盐度水透镜（LSWL）从CDW主体上脱落。原位观测结果表明，2006年8月，一条低水位WLWS从河口附近的CDW主体上脱离了。在本文中，利用三维模型探讨了风，潮汐，斜度和上升对LSWL的影响。结果表明：（1）风在这些脱离事件中起着至关重要的作用，这是因为风引起的北向欧拉残余电流在CDW上施加了不均匀的力并切断了CDW，从而形成了LSWL。（2）上升流将高盐度水从下层带到上层，垂直截断了低盐度水舌，有利于低空位水体的分离和维持；（3）最小水WLWL演变过程中的上升流是由风和潮汐的综合作用引起的。风浪上升的影响主要在海岸附近，