海相油气地质2025，Vol.30Issue(6)：575-585,11.DOI:10.3969/j.issn.1672-9854.2025.06.004
东非鲁伍马盆地晚始新世重力流与底流交互作用数值模拟
Numerical simulation of gravity flow-bottom current interaction during Late Eocene in the Rovuma Basin,East Africa
摘要
Abstract
The lateral migration of deepwater channel-lobe complexes,driven by the gravity flow-bottom current interaction,is a critical yet poorly understood process in deepwater deposition.Using ANSYS finite element analysis,this paper conducts the numerical simulations to replicate the sediment distribution patterns and investigate the sedimentary dynamics during Late Eocene in the Rovuma Basin.Our simulations reveal the two primary mechanisms governing sedimentation and erosion in its migrating channel-lobe complexes:(1)Bottom current primarily affect fine muddy particles in gravity flow,while having minimal influence on coarser sand particles.This selective transport causes muddy particles to drift in the downstream direction of the bottom current,leading to the formation of asymmetric muddy overflow levees.(2)Bottom current shift the high-velocity core of channel flow toward the counter-bottom current side,creating additional lateral erosion on that side of the channel wall.The continuous interplay of these sedimentation and erosion processes enhances geomorphic asymmetry,driving the progressive migration of channel-lobe complexes toward the counter-bottom current side.These findings provide new insights into the sedimentary dynamics of gravity flow-bottom current interactions,enhancing our understanding of deep-water depositional processes.关键词
重力流/底流/沉积动力学/数值模拟/晚始新世/鲁伍马盆地Key words
gravity flow/bottom current/sedimentary dynamics/numerical simulations/Late Eocene/Rovuma Basin分类
能源科技引用本文复制引用
张仁骞,丁梁波,苏亦晴,吴佳男,田冬梅,李祥权,李沁已,徐四海,万卓然,赵文楷,马宏霞..东非鲁伍马盆地晚始新世重力流与底流交互作用数值模拟[J].海相油气地质,2025,30(6):575-585,11.基金项目
本文受海洋地质资源湖北省重点实验室开放基金(编号:MGR202303)、国家自然科学基金面上基金(编号:41672110)联合资助 （编号:MGR202303）
