Surficial Sediment Facies features near the Myrtle Bend Confluence with the Kootenai River near Bonners Ferry, ID

The surficial bed-sediment facies, herein after referred to as the sediment facies, quantitatively describes the dominant sediment substrate on the surface of the river bed. Sediment facies categories were based on the grain size distribution of Wentworth (1922) which included the following ranges or combination of ranges: gravel (2-64mm), sand (0.063-2mm) and silt/clay (less than 0.063mm). An underwater video monitoring system UVMS was used to collect visual samples of the sediment facies determine the type and dominant size of the substrate, and record the geographical position of the substrate. UVMS data was collected intermittently at each site from 2006 – 2012.

本研究中的表层河床沉积相（以下简称沉积相），是对河床表层优势沉积基质的定量化表征。沉积相分类依据温特沃斯（Wentworth, 1922）提出的粒度分级标准，涵盖以下粒径范围或其组合：砾石（2~64毫米）、砂（0.063~2毫米）以及粉砂/黏土（小于0.063毫米）。本研究采用水下视频监测系统（Underwater Video Monitoring System, UVMS）采集沉积相的视觉样本，以确定基质类型与优势粒径，并记录基质的地理位置。2006年至2012年间，各监测点位均间断采集了UVMS相关数据。