Experimental Flume Study of Bedrock Incision by Abrasion: Interface Evolution

基岩磨损切割实验水槽研究：界面演化

• 批准号: 0439037
• 负责人: Kelin Whipple
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2008-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0439037&HistoricalAwards=false
• 关键词: Experimental; Flume; Study; Bedrock; Incision

At orogen scale, rock uplift rates are strongly influenced by erosional efficiency, which is set by climatic conditions, bedrock quality, and the sediment load carried by rivers. And, river incision rates ultimately control regional denudation rates and patterns because rivers set the boundary condition for hillslope erosion. This project will develop and test process-specific models of river incision into bedrock. In particular, the quantitative relationships among bedrock properties, river sediment load (flux, size, sorting), flow hydrodynamics, and bed morphology remain important unknowns and support the conceptual framework that erosion rates depend on evolving feedbacks among bed topography, fluid flow, and sediment transport. A refined, physically reasonable, quantitative model of bedrock incision into bedrock will be developed to rationally interpret specific erosional morphologies observed in the field in terms of flow and sediment transport conditions. Preliminary experiments have been conducted in (SAFL, UMn) and a new flume to be constructed at MIT.

在造山带尺度上，岩石抬升速率受到侵蚀效率的强烈影响，侵蚀效率是由气候条件、基岩质量和河流携带的沉积物负荷决定的。 而且，河流切割率最终控制区域剥蚀率和模式，因为河流设定了山坡侵蚀的边界条件。该项目将开发和测试河流切入基岩的特定过程模型。特别是，基岩性质、河流沉积物负荷（通量、大小、分选）、流动流体动力学和河床形态之间的定量关系仍然是重要的未知数，并支持侵蚀速率取决于河床地形、流体流动和河床之间不断变化的反馈的概念框架。泥沙输送。 将开发一个精细的、物理上合理的、基岩切入基岩的定量模型，以合理地解释在流动和泥沙输送条件方面观察到的特定侵蚀形态。初步实验已在（SAFL，UMn）进行，并且麻省理工学院将建造一个新水槽。