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本文运用因子分析和交叉谱分析方法对广东水东湾晏镜海滩剖面实测数据进行了地貌过程分析。因子分析结果提取了4个主因子,累积方差达90％。这4个主因子分别代表了碎波带的脊—沟过程、冲流带的滩肩过程、引起后滨面切割的侵蚀性裂流—滩角过程和造成上部滩面净侵蚀的潮汐过程。先前波况对海滩剖面的影响通过交叉谱分析表明,平均海面以上海滩单宽体积变化落后于波能变化1.6—3.4d。海滩剖面动态分析显示平均海面以下是净侵蚀场所,平均海面以上则处于动态平衡。海滩主状态目前为脊—沟或低潮台地的中间类型。
In this paper, using the factor analysis and cross-spectrum analysis method to analyze the geomorphic process of Yanjing Beach profile in Shuidong Bay, Guangdong Province. Factor analysis results extracted four main factors, the cumulative variance of 90%. These four main factors represent the ridges and valleys of the rifting zone, the beach shoulder of the rifting zone, the erosive rivulet-beach process leading to the back-cutting and the tidal process of net erosion of the upper beach. The effect of the previous wave on the beach profile The cross-spectrum analysis shows that the single-width volume change of the beach above the mean sea level lags behind the wave energy change of 1.6-3.4 days. Dynamic analysis of the beach profile shows that below the average sea surface is a net erosive site and above average sea level is in dynamic equilibrium. The main state of the beach is now an intermediate type of ridge-ditch or low-lying platform.