Collaborative Research: Tracer Stone Studies; Field and Flume

S. Burges和P. De Vries（华盛顿大学）和G. Parker（明尼苏达大学）组成的团队计划在颗粒尺度上合作研究粗质层质输运的力学。砾石示踪颗粒是研究山地河流沉积物纵向移动、分散和纵向混合的一种便捷方法。然而，对示踪剂位移的实地观测还没有全面地与河流中泥沙输送的正式框架联系起来。该研究将使用实验作为理论/数值研究和现场规模研究之间的桥梁，以a)开发用于非定常流动的示踪剂的距离移动、分散和混合的公式，b)将这些公式与河床输运的机制理论联系起来，c)根据测试理论和数值预测所需的标准进行现场数据测试和验证结果。实地研究将在华盛顿州西部的几条河流中进行。实验研究将在圣安东尼福尔斯实验室进行。华盛顿和明尼苏达的研究小组将在这两方面进行合作，双方都将为预测数值模型的发展做出贡献。

The team of S. Burges and P. De Vries (Univ. of Washington) and G. Parker (Univ. of Minnesota) plan collaborative research into the mechanics of coarse bedload transport at the particle scale. Gravel tracer particles are a convenient way to study the longitudinal travel and dispersion and vertical mixing of sediment in mountain rivers. Field observations of tracer displacement have not yet, however, been linked comprehensively into the formal framework of sediment transport in rivers.The study will use experiments as a bridge between theoretical/numerical research and field-scale research to a) develop formulations for distance moved, dispersion and mixing of tracers for unsteady flow, b) link these formulations to mechanistic theories of bedload transport and c) test and validate the results against field data taken to the standards needed to test theory and numerical predictions.The field research will be conducted in several streams in western Washington State. The experimental research will be conducted at St. Anthony Falls Laboratory. The Washington and Minnesota teams will collaborate on both efforts, with both sides contributing to the development of a predictive numerical model.