Particle kinematics and sediment transport processes in mountain streams: the role of sediment supply and flow regimes

山间溪流中的颗粒运动学和沉积物输送过程：沉积物供应和流动状态的作用

• 批准号: 249673-2012
• 负责人: Hassan, Marwan
• 金额: $ 2.33万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=547355
• 关键词: Particle; kinematics; sediment; transport; processes

Despite a large body of research on sediment transport, no agreement has been established on a governing equation appropriate to the estimation of bulk sediment movement in stream channels over time. In part, this is due to the irregularity of the granular beds acted upon by temporally and spatially variable fluid forces, bedsurface structures and armouring, and episodic sediment supply. Indeed, bed surface composition (texture and structure) and the sediment supply/storage regime both play important roles in controlling channel stability and regulating sediment transport in streams. Mountain streams are especially complex; stones form structures that exert significant influences on both the mobility of the bed sediment and the nature of the flow. In addition, these streams episodically receive large inputs of sediment from adjacent hillslopes, potentially dominating channel morphology and system dynamics. Although many studies have investigated the dynamics of lowland rivers with less variable sediment and flow regimes, little research has focused on mountain streams.

尽管有大量的研究泥沙输移，没有协议已建立一个控制方程，适当的估计散装泥沙运动在河道随时间的推移。 在某种程度上，这是由于颗粒床的不规则性所作用的时间和空间变化的流体力，床面结构和装甲，和幕式沉积物供应。事实上，床面组成（纹理和结构）和沉积物供应/存储制度都发挥重要作用，在控制通道的稳定性和调节河流中的泥沙输运。山区溪流特别复杂;石头形成的结构对河床沉积物的流动性和水流的性质都有重大影响。 此外，这些流间歇性地接收来自邻近山坡的大量沉积物输入，可能主导通道形态和系统动力学。虽然许多研究已经调查了低地河流的动力学变化较小的泥沙和流态，很少有研究集中在山区溪流。