Thickness and characteristics of overbank sediment deposited during an extreme flood in May 1978 along Powder River, Montana

This data release consists of tables with the thickness and particle-size characteristics of overbank sediment deposited in May 1978 along the valley of Powder River in southeastern Montana. About 900 sediment samples were collected at regularly-spaced distances from 20 valley transects along a 90-kilometer reach of Powder River between Moorhead and Broadus, Montana. The decrease in sediment thickness and particle size with distance from the main channel showed weak trends, which were caused by the variability introduced by vegetation sediment traps and subsidiary channels.

本数据集包含1978年5月沉积于蒙大拿州东南部鲍德河（Powder River）河谷的漫滩沉积物厚度与粒度特征相关表格。研究团队在蒙大拿州穆尔黑德（Moorhead）与布罗德乌斯（Broadus）之间90公里的鲍德河河段，沿20条河谷断面，于各断面的等间距位置采集了约900份沉积物样品。沉积物厚度及粒度随距主河道距离增大而呈现的递减趋势并不显著，该趋势由植被滞沙带与支流河道引入的沉积物分布变异性所导致。