作　　者： ; ; ; ; ;

机构地区： 华东师范大学河口海岸科学研究院河口海岸学国家重点实验室

出　　处： 《台湾海峡》 2009年第2期149-155,共7页

摘　　要： 基于珠江口荷包岛南湾海滩碎波带垂向上的悬沙浊度和同步实测潮位资料,本文利用谱分析和小波分析方法对碎波带的悬沙浊度变化特征和影响因素进行分析.结果表明:(1)碎波带近底层和中层的悬沙浊度变化表现为周期性振荡特征,其中处于低频部分的近底层悬沙浊度周期约为中层悬沙浊度的1.25倍,但处于高频振荡部分的近底层和中层悬沙浊度变化周期基本一致.此外,近底层悬沙浊度峰值滞后于中层的悬沙浊度变化.(2)碎波带的中层悬沙浊度与潮位变化呈明显的负相关,且滞后于潮位变化.(3)近底层的悬沙浊度变化主要受控于波浪动力作用,而潮位变化引起的潮流作用是中层悬沙浊度变化的主要因素. Based on the data of vertical suspended sediment turbidity and tide level taken synchronously in a surf zone of South Beach, Hebao Island in the Pearl River Estuary, changes in suspended sediment turbidity and factors affected are analyzed using wavelet analysis and spectral analysis. The results show that （ 1 ） suspended sediment turbidity of the middle and near-bottom water layer in the surf zone are characteristics of periodic oscillations, of which the periods of lower frequency were about 0.25 time,~ longer near the bottom water layer than in middle water layer. However,the similar oscillation in the part of high-frequency can be found in both two water layers. In addition, the peak of suspended sediment turbidity near the bottom layer is lagged behind that in the middle layer. （2） There are obvious negative correlations between the suspended sediment turbidity in the middle layer and tide levels, and the change of the former is lagged behind the latter. （3） Changes in suspended sediment turbidity near the bottom layer can be dominated by the wave actions. However, the changes can be an important factor in generating the oscillations movement of tidal currents resulted from the tidal of suspended sediment turbidity in middle water layer of the surf-zone.

关 键 词： 碎波带 悬沙浊度 谱分析与小波分析

领　　域： [天文地球] [天文地球]