沉积学报2025，Vol.43Issue(3)：813-826,14.DOI:10.14027/j.issn.1000-0550.2024.057
浊流沿程特征的一维数值模拟研究
One-dimensional Numerical Simulation of Turbidity Flow Characteristics in the Flow Direction
摘要
Abstract
[Objective]To perform a numerical simulation of turbidity flow to demonstrate the effects of factors influ-encing the turbidity flow and sediment deposition.[Methods]A numerical calculation model of turbidity current was constructed based on the average layer thickness model.Initial particle size concentrations,inflow thickness and in-flow velocity were modeled to assess the flow and deposition processes for suspended particles in a submarine turbidi-ty current.Four particle sizes and a 3%flow-channel slope were simulated and the findings were analyzed.[Results](1)In terms of thickness,the turbidity current began to thicken at the initial stage of its evolution as environmental water was entrained,then gradually thinned as sediment was introduced.(2)The flow velocity was observed to be in three stages:acceleration,uniform velocity,and deceleration.For the same initial thickness and sediment concentra-tion,a higher content of fine-grained sediment resulted in a more stable turbidity current(i.e.,the current main-tained a uniform flow for longer).For similar sediment composition and concentration conditions,a thicker turbidity current was more stable.(3)The greatest accumulation of sediments occurred close to the source of the turbidity cur-rent and mainly at the central axis of the channel,decreasing monotonically with distance from the central axis.The deposition rate in a very thick,rapid turbidity current is smaller,but the overall quantity of deposited material is greater.[Conclusions]These results demonstrate that the method described is suitable for the study of field-scale tur-bidity currents and its future application is expected for naturally occurring turbidity currents.关键词
浊流/数值模拟/水动力特性/沉积特征Key words
turbidity/numerical simulation/hydrodynamic characteristics/deposition characteristics分类
天文与地球科学引用本文复制引用
赖孟涛,王俊辉,张春明..浊流沿程特征的一维数值模拟研究[J].沉积学报,2025,43(3):813-826,14.基金项目
国家自然科学基金项目(42172108) （42172108）
中国石油大学(北京)科研基金项目(2462020BJRC002,2462022YXZZ010)[National Natural Science Foundation of China,No.42172108 （北京）
Science Foundation of China University of Petroleum,Beijing,No.2462020BJRC002,2462022YXZZ010] （）
