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对采自西巢湖湖心的一根长为143 cm的沉积柱进行了粒度分析,重建了粒度组成的演变过程。湖心沉积物主要为粉砂和黏土,粒度参数(平均粒径、标准偏差、偏度、尖度、分维值)分析表明沉积物分选程度较好,均为正偏态,峰态为很窄到非常窄,且具有一定的分形特征。C-M图解和概率累积曲线揭示了较弱的水动力环境,颗粒的搬运方式主要为跃移和悬移,比例分别约为70%和25%~30%。结合因子分析,识别出第一主因子(PC1)对细粒物质含量存在显著影响,其值反映了碎屑物质在湖泊中的搬运距离,PC1因子与平均粒径Mz可作为巢湖湖泊水位的替代性指标。
A 143 cm long sedimentary column collected from the heart of Xichang Lake was analyzed for grain size and the evolution of grain size was reconstructed. Sediments of lake core are mainly silt and clay. The analysis of grain size parameters (average particle size, standard deviation, skewness, sharpness and fractal dimension) shows that sediments are sorted well, all of them are positive and peaked at Very narrow to very narrow, and has a certain fractal characteristics. The C-M plot and the cumulative probability curve reveal a weaker hydrodynamic environment. Particles are mainly migrated and suspended, accounting for about 70% and 25% -30%, respectively. Combined with factor analysis, it was identified that PC1 had a significant effect on the content of fine-grained matter, and its value reflected the transport distance of detritus in lakes. PC1 factor and average particle size Mz could be used as an alternative to water level in Chaohu Lake Sexual indicators.