摘要
应用PRD-LTMM长周期"动力-沉积-形态"模型和非线性动力学拉格朗日拟序结构理论对全新世海侵盛期以来珠江三角洲以及河网干道的形成演变进行了地貌动力学分析,结果显示:受曲折岸线和复杂地形的影响,海侵盛期古珠江河口湾的水动力随时空高度变化,形成了7个具有不同运动特性的条带区域,并产生了许多不同尺度且相对独立的沉积动力结构,形成了众多的沉积体。这些沉积体成为了三角洲发育演变的基本建构单元。三角洲的主体沉积可概括为受原始地形分隔的若干相对独立的充填过程,干流河道的形成和发育往往是若干相邻沉积体发育和延伸的结果,而三角洲河网干道的总体分布格局则受这些动力区域所控制。
A long-term morphdynamic model（PRD-LTMM）and a non-linear dynamics theory Lagrangian coherent structures were applied to study the formation and development of the deposition bodies and main channels in the Zhujiang River Delta.The results indicated that mainly due to the convoluted coastline and hundreds of rocky islands scattered in the paleo-estuarine bay,seven different dynamic zones were formed,and many different kinds of medium and small scale dynamic structures were generated,then caused a great deal of deposition bodies.Deposition bodies is the basic unit in the hierarchical deposition structure of the Zhujiang River Delta.The general evolution of the Zhujiang River Delta can be summarized as a number of relatively separate‘filling up＇processes.With the continuous growth of the deposition bodies,the broad water body was funneled into the channel frame of the Zhujiang River Delta network,and a continuous delta plain was formed.
作者
韦惺
吴超羽
Wei Xing;Wu Chaoyu(State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China;Center for Coastal Ocean Science and Technology Research,Sun Yat sen University,Guangzhou 510275,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2018年第7期66-78,共13页
基金
广州市科技计划项目(201607020042)
关键词
珠江三角洲
河网
沉积体
发育演变
长周期模型
拉格朗日拟序结构
Zhujiang River Delta
river network
deposition body
formation and development
long term model
Lagrangian coherent structures
