沉积学报2025，Vol.43Issue(3)：769-781,13.DOI:10.14027/j.issn.1000-0550.2023.143
湖相细粒浊流沉积动力学机制初探
Preliminary Study of the Dynamic Mechanism of Lacustrine Fine-grained Turbidity Deposits Based on a Flume Sedimentary Simulation
摘要
Abstract
[Objective]This study investigated the sorting movement and sedimentary characteristics of fine-grained sediments under the action of turbidity currents,and analyzed the controlled factors of their transport distance and the spatial distribution of sediment.[Methods]Based on a circular flume simulation,the transport and deposition process of fine-grained sediments carried by turbidity currents were simulated and analyzed by controlling three condi-tions:the initial fluid velocity,sediment concentration,and sand-mud ratio.Furthermore,the sedimentary dynamic mechanism was explored.[Results](1)Fine-grained sediments transported by turbidity currents experience experi-mental phenomena such as"water jumps","double flow segmentation","lofting","head lifting",and"new heads"during the flow process.(2)During fluid transportation,the movement speed and distance of fine-grained sediments are influenced by the concentration difference between the fluid and the environmental fluid.(3)Factors such as the initial flow velocity,water jumps,and lofting control the fluid flow velocity,fine-grained sediment transport distance,and spatial distribution.(4)The"new head"phenomenon causes sand bodies carried by the fluid to become discontinuous,isolated,or dispersed.[Conclusions]Based on the"new head"phenomenon in the simula-tion process,we offer insights on the causes of dispersed sand bodies.The results of this study can serve as a refer-ence for studying the formation and distribution of dispersed sand bodies.关键词
细粒浊流/动力学机制/物理沉积模拟/运移规律/"新头部"现象Key words
fine-grained turbidity currents/dynamic mechanism/physical sedimentation simulation/transport law/"new head"phenomena分类
天文与地球科学引用本文复制引用
吕奇奇,王林,罗顺社,刘江艳,尤源,闫红果,蒲宇新,孙学虎,张蕾..湖相细粒浊流沉积动力学机制初探[J].沉积学报,2025,43(3):769-781,13.基金项目
国家自然科学基金项目(42102170) （42102170）
国家重点基础研究发展计划(973计划)项目(2014CB239003)[National Natural Sci-ence Foundation of China,No.42102170 （973计划）
National Key Basic Research Program of China(973 Program),No.2014CB239003] （973 Program）
