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.

山区的物质运动通常会将沉积物直接输送到河流网络，从而导致在相对较大的输送事件期间可能触发即时通道响应的耦合条件。值得注意的是，输送事件可以重置本地通道配置文件，并管理输送点下游通道床架构的构建和维护。沉积物输送事件后的当地响应率和轨迹是当前流域流态、事件幅度、通道宽度梯度以及某些情况下鲑鱼等水生物种活动浓度的函数。虽然低地河流系统一直是大量研究的重点，但在山区溪流中开展的工作要少得多，而且很少涉及山区河道对水流或沉积物供应状况变化的反应。