Surface-sediment grain-size distributions from the Elwha River delta, Washington, September 2014

This portion of the data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in September 2014 (USGS Field Activity 2014-649-FA). Surface sediment was collected from 63 locations using a small ponar, or 'grab', sampler from the R/V Frontier on September 5, 2014 in depths between about 1 and 17 m around the delta. The locations of grab samples were determined with a hand-held global navigation satellite system (GNSS). The grain-size distributions of samples were determined using standard techniques developed by the USGS Pacific Coastal and Marine Science Center sediment lab. The grain-size data are provided in a comma-delimited spreadsheet (.csv).本次发布的数据子集包含2014年9月于美国华盛顿州埃尔瓦河三角洲采集的沉积物粒度数据，对应美国地质调查局（USGS）野外活动编号2014-649-FA。2014年9月5日，研究团队搭载“前沿号”科考船（R/V Frontier），使用小型波诺采泥器（ponar grab sampler，又称抓斗式采泥器），在三角洲周边水深1至17米的63个采样站位采集了表层沉积物样品。抓斗采样站位通过手持全球导航卫星系统（GNSS）确定坐标。样品的粒度分布通过美国地质调查局太平洋海岸与海洋科学中心沉积物实验室研发的标准实验方法完成测定。本次粒度数据以逗号分隔电子表格（.csv）格式提供。