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An experimental investigation of autogenic behaviour during alluvial fan evolution

机译:冲积扇演变过程中自生行为的实验研究

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摘要

The findings from a series of laboratory experiments designed to examine the role of autogenic process-form interactions as controls on alluvial fan evolution are presented. The experimental approach follows the 'similarity of processes' concept and is therefore not scaled to a real world prototype. The experiments were conducted in the University of Exeter Sediment Research Facility using a 3 × 3 m fixed bed experimental table with controlled sediment and water supply fed to the fan apex, and evacuation of all sediment that passes the distal boundary. The evolution of the fan was recorded using high resolution time-lapse overhead photography to permit analysis of fan topography, flow patterns, channel migration and avulsion on the fan surface over the course of the experimental run. The qualitative observations from three experimental scenarios are discussed and evaluated in the context of current understanding of alluvial fan evolution. These demonstrate that in the absence of any change in the extrinsic variables there is an autogenic transition from sheetflow to channelised flow as the experimental fans evolve. This is consistent with theory that predicts this change in response to a decline in aggradation rate through time.
机译:提出了一系列旨在检验自体过程形式相互作用作为冲积扇演变控制的作用的实验室实验的结果。实验方法遵循“过程的相似性”概念,因此无法扩展为现实世界的原型。实验是在埃克塞特大学泥沙研究设施的3×3 m固定床实验台上进行的,将受控的沉积物和水供应到扇形顶点,并将通过远端边界的所有沉积物排出。使用高分辨率的延时高架摄影技术记录了风扇的演变,以分析风扇的形貌,流型,通道迁移以及在整个实验过程中风扇表面的撕脱。在当前对冲积扇演变的理解的背景下,讨论和评估了来自三个实验场景的定性观察。这些表明,在外部变量没有任何变化的情况下,随着实验爱好者的发展,存在从表层流向通道流的自生转变。这与预测随着时间推移的凝结速率下降而发生这种变化的理论相一致。

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