Modeling of Flow and Morphodynamics of Sinuous Submarine Channels

蜿蜒海底航道的流动和形态动力学建模

• 批准号: 1061244
• 负责人: Jasim Imran
• 金额: $ 26万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-04-01 至 2016-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1061244&HistoricalAwards=false
• 关键词: Modeling; Flow; Morphodynamics; Sinuous; Submarine

Vertically aggrading large sinuous channels constitute the basic building blocks of modern submarine fans. In recent years, 3D high resolution seismic data have also revealed numerous small scale subsurface sinuous channels on continental slopes. Recent studies have contributed new insights, but have also led to strongly opposing views, specifically on the helical flow structure in sinuous channels and its effect on channel morphology. A clear picture of intra-channel and over-bank processes of submarine channels can emerge through a comprehensive approach involving carefully designed experimental and numerical modeling efforts and close collaboration with marine geologists involved in the study of seafloor morphology. The PI will pursue laboratory and numerical modeling with primary focus on the following issues: (i) geometric and inflow constraints on the flow distribution at submarine channel bends; (ii) relationships between helical flow, bed-load transport, cross sectional variability and migration tendency of submarine channels; (iii) and overbank processes including grain size distribution and lobe formation due to flow splitting at channel bends. Experiments will be conducted in a 12.2 m × 6.1 m × 1.5 m laboratory tank, and numerical simulations at both laboratory and field scales will be conducted using 3D models of density and turbidity currents. The broader impacts relate to developing better landscape evolution models for submarine environments that would aid interpretation of seismic data sets by both academic and industry researchers. In addition to this the PIs outline a plan to increase minority involvement in geoscience research through funding of a program that the University of South Carolina already has in place. He also plans to hold a workshop.

垂直汇总的大型险恶渠道构成了现代潜艇迷的基本基础。近年来，3D高分辨率地震数据还揭示了连续斜率上的许多小规模地下污染通道。最近的研究贡献了新的见解，但也导致了强烈反对的观点，尤其是关于螺旋流渠道中的螺旋流结构及其对渠道形态的影响。通过在精心设计的实验和数值建模工作中涉及的全面方法以及与参与海底形态研究的海洋地质学家的密切合作的全面方法，可以清楚地了解海底渠道的通道和过度银行过程。 PI将追求实验室和数值建模，主要关注以下问题：（i）在潜艇通道弯曲处的流量分布上的几何和流入限制； （ii）螺旋流量，床载运输，横截面变异性与海底通道的迁移趋势之间的关系； （iii）和超银行过程，包括由于弯道处的流动分裂而引起的晶粒尺寸分布和叶片形成。实验将在12.2 m×6.1 m×1.5 m的实验室储罐中进行，实验室和野外尺度的数值模拟将使用3D模型和浊度的3D模型进行。更广泛的影响与为海底环境开发更好的景观演化模型有关，这将有助于解释学术和行业研究人员的地震数据集。除此之外，PIS概述了通过资助南卡罗来纳大学已经制定的计划来增加少数群体参与地球科学研究的计划。他还计划举办一个研讨会。