中文摘要：

太湖底泥在风浪条件下的再悬浮及其与上覆水体之间污染物的释放扩散特性研究越来越受到国内外学者的重视，但水生植物的影响机制还有待深入研究。在鼓风式环形水槽种植天然沉水植物苦草，利用三维声学多普勒流速仪ADV研究水流特性，用悬浮颗粒物SPM质量浓度表征底泥再悬浮量，分析不同风速条件下沉水植物水流结构的变化及对底泥再悬浮的抑制作用。结果表明，在大风（8.78 m/s）、中风（5.95 m/s）、小风（3.21 m/s）扰动作用下，对照组水槽中水流结构均服从指数分布，且距离水体表层10 cm以内区域流速受风速的影响最明显，垂向变化梯度最大，随水深增加，变化梯度逐渐减小。试验组有沉水植物的水槽水流流速均小于对照组流速，水流结构明显改变，植物有效高度内流速变化缓慢，大、中、小风情况下分别稳定在0.7 cm/s、1.5 cm/s、2.1 cm/s左右；植物层以上区域流速变化梯度则较大，特别是在中风情况下，从1.7 cm/s增加到9.35 cm/s，增加了4.5倍。同时，沉水植物对底泥再悬浮有显著抑制作用，上覆水悬浮物质量浓度降低了90%以上，并最终保持在6.3~13.3 mg/L的低质量浓度状态。

英文摘要：

The paper aims to introduce its investigation of the effects of the submerged vegetations on the water current structure which is measured by a 3-D Acoustic Doppler Velocimeter （ADV） and on the restraining factors of the sediment resuspension characterized by the suspended particulate matter （SPM） concentration under different wind-wave disturbance intensities. As a matter of fact, the biological research circle has been attaching more and more attention to the wind-wave conditions on the Taihu Lake sediment resuspension and the pollutant release characteristics between the sediment and overlying water body. Nevertheless, little has been studied over the influential factors and the mechanism of the aquatic vegetations. Coming from this urgent need, we have designed a pneumatic annular flume with a controlled blower installed at its top to simulate the wind-driven current in hoping to disclose the mechanism of the aquatic vegetations in the lake. The three flumes we have developed are covered with 10 cm sediment sludge sampled from Zhushan Bay, Taihu Lake, with the submerged vegetation （ Vallisneria natans ） planted in the system. And, then, we have managed to divide the simulated speed into the strong wind （8.78 m/s） one, the medium wind （5.95 m/s） one and the small wind one （3.21 m/s）, respectively. The results of our investigation reveal that the velocity distributions of the vegetal flow under the wind-blowing affection differ from that in the open channels. The flowing structures without the submerged vegetation under the three different wind speeds all follow the exponential distribution and the regional distances within the 10 cm from the water surface tend to be affected by the wind speed more obviously, with the velocity varying greatly. With the increase of the water depth, the gradients tend to decrease gradually. As compared with the flume without vegetation, the velocity of water flowing in the flumes with vegetation tends to suffer an obvious delay. The gradients of the vertic