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

该项目将研究河流推移质运输动力学之前和之后的放置大型木质残体（LWD）在Siuslaw国家森林在俄勒冈州海岸山脉。 在LWD就位之前，该小组将用被动集成转发器标签测量底床载荷，并跟踪它们的运动。 最近有消息称，除了场地的可达性之外，目前在这片国家森林中没有其他此类项目的计划或提议，这为在一系列条件下捕获就位前沉积物动态带来了紧迫性和机会。 这项研究将（a）提供关于实地条件下河床物质沉积物迁移的基本和稀有资料，这些资料将作为根据水槽和工程河流研究评价沉积物迁移关系的宝贵参考点;（B）探讨山区河流沉积物迁移对下游碎片特性和上游供应限制的敏感性;和（c）确定是否颗粒大小的运输依赖性是加重或抑制碎片和其他渠道的不规则性。这个项目将提供难得的数据，将告知不仅在理论上了解山区河流泥沙运输，而且流恢复从业人员的LWD放置的影响。 LWD的一个应用是管理鲑鱼栖息地。 该小组将与太平洋西北部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.