巢湖风浪特征及泥沙运动对口门航道淤积的影响

Influence of wind and wave characteristics and sediment movement on sediment deposition of entrance waterway in Chaohu Lake

针对引江济淮工程巢湖口门航道的整治工程问题,通过MIKE3软件建立巢湖波浪泥沙三维数值模型,结合巢湖湖流、波浪及泥沙的现场观测资料,对巢湖风浪特征及泥沙运动对口门航道淤积的影响进行研究。着重分析巢湖湖区的风浪特性及白石天河口门与马尾河航道风速与波高的响应关系、有效波高与底部剪切应力的响应关系,并探讨与分析波浪湖流作用下巢湖泥沙输移对湖区口门航道的影响。结果表明,巢湖波浪特性与其风况条件密切相关,其近岸泥沙主要以“波浪掀沙、水流输沙”的形式运动,将对巢湖口门航道的淤积产生直接影响。

Aiming at the problem of the regulation project of estuary channel of Chaohu Lake in the Yangtze River to Huaihe River project,we adopt the software of MIKE3 to establish a three-dimensional numerical model of the wave and sediment in Chaohu Lake,and study the effects of wave characteristics and sediment movement on the sedimentation of estuary channel in Chaohu Lake combining with the on-site observation data of the lake flow,wave and sediment.We analyze the wave characteristics of Chaohu Lake and the response relationship between wind speed and wave height of Baishitian River and Mawei River estuary channel,the response relationship between effective wave height and bottom shear stress,and discuss and analyze the influence of Chaohu Lake sediment transport on the estuary channel under wave and lake flow.The results show that the wave characteristics of Chaohu Lake are closely related to its wind conditions,and the nearshore sediment mainly moves in the form of“lifting the sand by waves and transporting the sand by lake flow”,which will have a direct influence on the deposition of Chaohu Lake estuary channel.