Grain size data from the Carmel River, central California, 2013 to 2017

Pebble count data were collected during four summer surveys (2013, 2015, 2016 and 2017) at ten sites along the Carmel River, CA. Grain-size measurements were made at four to six transects per site using a 0.5 by 0.5 m sampling frame, with 100 counts per transect. Each transect was defined by coordinates on the left and right sides of the river, and grain sizes were measured at points between those endpoint coordinates (see accompanying file at https://www.sciencebase.gov/catalog/item/5a271f8ce4b03852bafc8eaa for transect endpoint coordinates).
Grain-size diameters were measured using a gravelometer, where we recorded the largest sieve size on the gravelometer that an individual particle did not pass through, similar to recording the percent retained in standard sieve analyses. We shifted these grain-size values to the next size class up in this spreadsheet, with the data being analogous to the percent passing in sieve analyses.

本数据集的砾石计数数据采集于2013、2015、2016及2017年开展的四次夏季科考，采样点位位于美国加利福尼亚州卡梅尔河沿岸的10处监测站点。每个监测点布设4至6条采样断面，采用0.5 m×0.5 m的采样框架开展粒度测量，每条断面完成100次砾石计数。每条采样断面以河流两岸的端点坐标划定，粒度测量点布设于该两端点坐标之间的点位（断面端点坐标详见附件文件：https://www.sciencebase.gov/catalog/item/5a271f8ce4b03852bafc8eaa）。
砾石粒径直径采用砾度计（gravelometer）进行测量，记录单颗砾石无法通过的最大筛孔尺寸，该方法与标准筛析分析中记录筛上留存百分比的操作逻辑一致。本数据表中将上述粒径值上调至相邻上一级粒径等级，所得数据与筛析分析中的筛下通过率百分比具有等效性。