Cross-Section Geometry and Sediment-Size Distribution Data from Muddy Creek and North Fork Gunnison River below Paonia Reservoir, 2016

This data set contains cross-section geometry and sediment-size distribution data collected in the fall of 2016 from Muddy Creek and North Fork Gunnison River below Paonia Reservoir, Colorado. Six cross-sections were surveyed using Real-Time Kinematic Global Navigation Satellite System (RTK-GNSS) methods to document channel geometry below the reservoir in 2015. Those same cross-sections were re-surveyed using the same methods in 2016 to document any changes. One cross-section was surveyed on Muddy Creek below Paonia Reservoir, and five cross-sections were surveyed from North Fork Gunnison River below Paonia Reservoir. All six cross-sections are incorporated in this data release within one shapefile. Pebble-counts were performed at each of the six cross-sections to document sediment-size distributions downstream from the reservoir. Four transects were located in the vicinity of each cross-section, where sediment size was measured and recorded. Transect locations were based on bankfull channel width; with transect 1 located one bankfull channel width upstream from the surveyed cross-section, transect 2 at the surveyed cross-section, and transects 3 and 4 located one and two bankfull channel widths downstream from the surveyed cross-section, respectively. All of the sediment-size distribution data are presented in .CSV files, with one file for each cross-section location incorporating all of the data for each of the four transects at that location.

本数据集包含2016年秋季于美国科罗拉多州帕奥尼亚水库下游的泥泞溪（Muddy Creek）与甘尼森河北支流（North Fork Gunnison River）采集的河道断面几何形态与沉积物粒度分布数据。2015年，研究团队采用实时动态全球导航卫星系统（Real-Time Kinematic Global Navigation Satellite System, RTK-GNSS）方法对6条河道断面开展测量，以记录该水库下游的河道几何形态；2016年，又采用相同方法对上述6条断面进行复测，以记录河道形态的变化情况。其中，帕奥尼亚水库下游的泥泞溪布设1条断面，甘尼森河北支流下游布设5条断面。本次数据发布将全部6条断面整合至一个形状文件（shapefile）中。
在6条断面的每一处均开展了砾石计数工作，以记录水库下游的沉积物粒度分布。每条断面周边布设4条样带，用于测量并记录沉积物粒径。样带位置依据满岸河道宽度确定：样带1位于测量断面上游1倍满岸河道宽度处，样带2位于测量断面上，样带3与样带4分别位于测量断面下游1倍与2倍满岸河道宽度处。
所有沉积物粒度分布数据均以逗号分隔值（CSV）文件形式存储，每个断面对应一个CSV文件，包含该断面处4条样带的全部测量数据。