RAPID: Continuous Measurement of Sediment Transport and Hydraulic Conditions in a Mountain Stream Prior to Wood Placement

该项目将研究在俄勒冈海岸山脉的Siuslaw国家森林中放置大型木屑（LWD）之前和之后的河床输运动力学。该团队将使用被动集成应答器标签对床载进行测量，并在LWD就位之前跟踪其运动。最近有消息称，除了该地点的可达性外，该国家森林目前没有其他此类项目的计划或提议，这为在一系列条件下捕捉就位前的沉积物动态创造了紧迫性和机会。这项研究将(a)提供关于在野外条件下河床物质沉积物运输的基本和罕见的信息，这些信息将作为评价基于水槽和工程河流研究的沉积物运输关系的有价值的参考点；(b)处理山溪沉积物运输对下游碎屑特征和上游供应限制的敏感性；(c)确定泥沙和其他不平整的河道是否加剧或削弱了搬运的粒度依赖性。该项目将提供很少获得的数据，不仅可以从理论上了解山溪中沉积物的运移，还可以让溪流恢复从业者了解随钻仪放置的影响。随钻测量的一个应用是管理鲑鱼的栖息地。该小组将与太平洋西北地区的国家森林科学家和从业人员进行互动。

This project will study river bedload transport dynamics prior to and following placement of large woody debris (LWD) in the Siuslaw National Forest in the Oregon Coast Range. The team will instrument bedload with passive integrated transponder tags and track their movements prior to emplacement of the LWD. Recent news that no other such projects are currently scheduled or proposed in this National Forest, in addition to the accessibility of the site, creates urgency and opportunity to capture the pre-emplacement sediment dynamics under a range of conditions. The study will (a) provide fundamental, and rare, information regarding bed material sediment transport in field conditions, information that will serve as a valuable reference point for evaluating sediment transport relations based on flume and engineered-stream studies; (b) address the sensitivities of mountain stream sediment transport to downstream debris characteristics and upstream supply limitations; and (c) determine whether grain-size dependence of transport is accentuated or dampened by debris and other channel irregularities.This project will provide rarely obtained data that will inform not only theoretical understanding of sediment transport in mountain streams, but also stream restoration practitioners about the impacts of LWD placement. One application of LWD is for managing salmonid habitats. The team will interact with National Forest scientists and practitioners in the Pacific NW.