沉积学报2025，Vol.43Issue(3)：860-879,20.DOI:10.14027/j.issn.1000-0550.2024.086
浅水三角洲沉积物理模拟与数值模拟的对比研究
Comparative Study on Physical and Numerical Simulations of Deposition in a Shoal Water Delta
摘要
Abstract
[Objective]The integration of physical and numerical deposition simulations is an inevitable trend in the development of deposition simulation technology.In recent years,shoal water deltas have gradually become the focus of research by various experts and scholars.The main factors affecting the growth and development of shoal water del-tas include ancient structures,topography,climate,and water flow.Previous scholars have conducted relevant re-search,but there is a lack of a more comprehensive quantitative analysis of the specific impact of the main controlling factors.In this study,the author takes the shoal water delta as an example for conducting a comparative study of phys-ical and numerical deposition simulations,exploring the problems in the integration of the two.[Methods]Three in-fluencing factors,namely sediment ratio,shoreline migration speed(lake level descent speed),and inlet flow rate,were selected.Physical and numerical deposition simulation methods were used to analyze the deposition evolution of the shoal water delta and the influence of control factors.Quantitative analysis was conducted using indicators such as sediment aspect ratio,area,and front edge roughness.[Results and Conclusions](1)The physical and numerical simulation experiments of shoal water delta deposition show that sediment ratio,shoreline migration speed(lake level descent speed),and inlet flow velocity have a significant impact on the aspect ratio,area,and front roughness chang-es,which are key factors affecting the development of shoal water deltas.(2)From a macro perspective,the results of physical and numerical simulations are consistent.Physical deposition simulations show that the inlet velocity of shoal water deltas is negatively correlated with aspect ratio,whereas numerical simulations provide a more detailed description of this.When the flow rate at the estuary is greater than 1000 m³/s but less than 1200 m³/s,the shoal wa-ter delta is in a period of morphological transformation,and the flow rate at the estuary is positively correlated with the aspect ratio of the shoal water delta.At speeds below 1000 m³/s and above 1200 m³/s,the flow velocity at the estu-ary is negatively correlated with the aspect ratio of shoal water deltas.Therefore,when using deposition simulations to predict the morphology and scale of shoal water deltas,low-cost numerical simulations can replace physical simula-tions for shoal water delta formation.(3)Physical and numerical simulations are different.Physical simulations indi-cate that there are two developmental mechanisms in shoal water deltas:the alternating growth of flower bodies and fan edges caused by the diversion of distributary channels and the alternating growth of flower bodies caused by the continuous diversion of river mouths.In numerical simulations,the growth of shoal water deltas is accompanied by breaches,abandonment of old distributary channels,and rapid formation of new distributary channels and estuarine sandbars(lobes).These sandbars are mainly finger-shaped and rarely exhibit fan-shaped lobes.This study explores the combination of physical and numerical deposition simulations,which has important theoretical significance and practical value for promoting oil and gas reservoir exploration research.This study explores the integration of physical and numerical deposition simulations and has important theoretical significance and practical value in promoting ex-ploration research of oil and gas reservoirs.关键词
沉积/物理模拟/数值模拟/浅水三角洲/泥沙比/岸线迁移/入口流量/前缘粗糙度Key words
deposition/physical simulation/numerical simulation/shoal water delta/sediment ratio/shoreline migration/inlet discharge/delta front roughness分类
天文与地球科学引用本文复制引用
李恬恬,胡光明,徐佑德,张亚金,王军,薛辉,刘先录,张庭瑀,周玉钦..浅水三角洲沉积物理模拟与数值模拟的对比研究[J].沉积学报,2025,43(3):860-879,20.基金项目
国家自然科学基金项目(41472097)[National Natural Science Foundation of China,No.41472097] （41472097）
