基于地貌信息熵的磨刀门河口拦门沙系统演变规律分析  

Evolution analysis of mouth bar system in the Modaomen Estuary based on geomorphic information entropy

作　　者：汪思敏 刘锋 王璞 韩志远 WANG Si-min;LIU Feng;WANG Pu;HAN Zhi-yuan(Guangzhou Branch,Guangdong Hydrology Bureau,Guangzhou 510150,China;Key Laboratory of Coastal Science and Integrated Management,Ministry of Natural Resources,Qingdao 266061,China;Institute of Estuarine and Coastal Research,School of Ocean Engineering and Technology,Sun Yat-Sen University,Guangzhou 510275,China;Tianjin Research Institute for Water Transport Engineering,MinistryofTransport,Tianjin300456,China)

机构地区：[1]广东省水文局广州水文分局,广东广州510150 [2]自然资源部海岸带科学与综合管理重点实验室,山东青岛266061 [3]中山大学海洋工程与技术学院河口海岸研究所,广东广州510275 [4]交通运输部天津水运工程科学研究所,天津300456

出　　处：《泥沙研究》2024年第4期53-59,共7页Journal of Sediment Research

基　　金：国家自然科学基金项目(42076171);国家自然科学基金项目(42376164);自然资源部海岸带科学与综合管理重点实验室开放基金项目(2021COSIMZ002)。

摘　　要：河口拦门沙演变受高强度人类活动的影响呈现新局面。珠江磨刀门河口经历综合整治后发生重大变化,其拦门沙系统演变过程存在不确定性。基于磨刀门河口不同年代地形数据,采用数字高程模型和地貌信息熵等方法,量化分析拦门沙不同地貌单元演变特征,分析拦门沙系统水深-面积关系的变化过程,揭示其系统状态转变规律。结果表明:磨刀门河口拦门沙系统呈现典型滩槽结构,不同地貌单元表现出阶段性变化特征;拦门沙东汊系统地貌演变呈有序发展,近年来沉积动力结构不断变化,有序性继续增强,拦门沙西汊系统地貌结构演变复杂,一直处于自适应的无序发展状态,不确定性较大。The evolution of the mouth bar shows new characteristics in the new circumstance driven by high-intensity human activities.The evolution of mouth bar in the Modaomen Estuary(ME)of the Pearl River Delta has experienced many uncertainties in systematic evolution in new circumstance after affected by large-scale reclamation activities.Based on topographic data in different periods,the methods including digital elevation model,geomorphological information entropy are applied to quantify the evolution of different morphological units of the mouth bar,to analyze the evolution process of the depth-area relationship and clarify the rules of the mouth bar system.The results indicate that the mouth bar system of the ME presents a typical shoal-channel structure,and the evolution of different morphologic units exhibits phased variation characteristics.The geomorphic evolution of the eastern channel bar system shows an orderly development,and the orderliness continues to strengthen with the constantly changing of sedimentary dynamic structure in recent years.The geomorphic structure of the western channel bar system is complex,its evolution has always been in a state of self-adaptive and disorderly development with a greater degree of uncertainty.

关 键 词：磨刀门河口 拦门沙 水深-面积关系 地貌信息熵 系统状态 

分 类 号：TV148.3[水利工程—水力学及河流动力学]