中文摘要：

以辐射沙洲海域两个潮周期的风速、水、沙实测资料为例,利用小波分析和最大熵功率谱分析结合的方法揭示了潮流水道流速、水深、风速、各层含沙量5个层次的小波分析信号的频谱关系和相位关系。对水体各层含沙量的潮过程中的各频段信号进行了分析,明确了其响应变化机制。潮流水道水体含沙量与风速、流速、水深的变化存在着复杂的响应关系。潮流水道悬沙含量的变化与风速（风浪）、流速、水深都有关系。涨落潮流的不对称性,水体背景含沙量,水流紊动,重力作用,响应延迟效用都影响着各层悬沙在潮动力过程中的悬浮与沉降过程。在不同的小波分析层次上的流速、水深、风速对水体含沙量变化所起的相对作用大小是不同的。在同一小波分析层次中的流速、水深、风速分别对不同水层的含沙量变化所起的相对作用大小也是不同的。含沙量的高频变化主要是水流流速的变化起作用。从风速和流速的频谱结构上来看,风速与水流之间有耦合响应关系,风速对含沙量变化起作用是通过影响潮流流速和产生波浪进行的。动力强迫与含沙量响应并不是线性对应的,而是具有非线性的特征。

英文摘要：

Based on the field data of flow and sediment at five stations in the radial sand ridges sea areas,the component items of suspended sediment transport are studied.The wavelet analysis is applied to analyse the fluctuations of the suspended sediment concentration,tidal flow velocity and sediment transportation.The close correlation exists between velocity and suspended sediment concentration of high-frequency,which is considered to be very important for sediment transportation.The process of sediment suspension and settlement in water is affected by the following factors such as dynamical asymmetry between floods and ebbs,background sediment concentration,water turbulence,gravitational process,dynamical response delay,etc.The different wavelet analysis levels of flow velocity,depth,wind speed have different role on the suspended sediment change.The same wavelet analysis level of flow velocity,depth,wind speed affect the sediment process in the water layers by different degrees.The flow velocity mainly affects the high-frequency changes in sediment concentration in water.Based on the structure of wind speed and velocity spectrum,the coupling response between the wind speed and current exists.By affecting the flow velocity and wave,the wind force takes action on suspended sediment changes.The relationship of sediment dynamic force and the corresponding response is non-linear.