Experimental Flume Study of Bedrock Incision by Abrasion: Interface Evolution

在造山带尺度上，岩石隆升速率受到侵蚀效率的强烈影响，而侵蚀效率是由气候条件、基岩质量和河流带沙量决定的。而且，河流切割速率最终控制了区域剥蚀速率和模式，因为河流为山坡侵蚀设定了边界条件。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、河流泥沙负荷（通量、大小、分选）、水流动力学和河床形态之间的定量关系仍然是重要的未知数，并支持了侵蚀速率取决于河床地形、流体流动和泥沙输送之间不断变化的反馈的概念框架。将建立一个精细的、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运输条件下实地观察到的特定侵蚀形态。初步实验已在（SAFL, UMn）和麻省理工学院（MIT）建造的新水槽中进行。

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.