Mountain stream adjustments to changes in flow and sediment supply regimes

山间溪流对流量和沉积物供应状况变化的调整

• 批准号: RGPIN-2017-03834
• 负责人: Hassan, Marwan
• 金额: $ 2.84万
• 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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633941
• 关键词: Mountain; stream; adjustments; changes; flow

Mass movements in mountainous regions often deliver sediment directly to the stream network, resulting in coupled conditions that can trigger immediate channel responses during relatively large delivery events. Notably, delivery events can reset the local channel profile and govern construction and maintenance of channel-bed architecture downstream of delivery points. The local response rate and trajectory following a sediment delivery event is a function of the prevailing watershed flow regime, the event magnitude, gradients in channel width, and in some instances the activity concentration of aquatic species such as salmon. Whereas lowland river systems have been the focus of a substantial body of research, much less work has been carried out within mountain streams and little concerning mountain channel responses to changes in flow or sediment supply regimes.

山区的质量运动通常会直接传递到流网络，从而导致耦合条件，可以在相对较大的交付事件中触发立即的通道响应。值得注意的是，交付事件可以重置本地频道概况，并控制交付点下游的渠道床位建筑的构建和维护。沉积物输送事件发生后的局部响应率和轨迹是流行流动状态，事件幅度，通道宽度的梯度以及在某些情况下的水生物种（如鲑鱼）的活动浓度的函数。尽管低地河流系统一直是大量研究的重点，但在山流中进行的工作少了，对山区通道对流动或沉积物供应制度的变化的反应很少。