Stream cross-section profiles in the Andrews Experimental Forest and Hagan Block RNA 1978 to 2011

This database consists of periodically resurveyed cross-section profiles for 5 sites (stream reaches) located in the H.J. Andrews Experimental Forest on 3rd to 5th-order stream channels over the period 1978-present, and also includes historical data from Shorter Creek within the Andrews and two sites (North and South) on the Hagan Creek in the Hagan Block RNA. Each of these sites includes 10-20 cross sections spaced about 10-50 m apart. Observations include cross-sectional geometry based on surveys relative to a horizontal line between permanent stations on opposite sides of the stream, substrate type based on pebble counts and notes on extent of bedrock, and photo-documentation of the sites. Sampling was primarily done annually until 2000 and opportunistically since then depending on funding and noted geomorphic changes in response to floods. Sampling at least every 5 years is desired. Data tables cover 1. elevation and distance measurements between fixed end points, 2. pebble counts for particle size, 3. measures of extent of exposed bedrock, 4. vegetation (1984 only) in terms of % cover by spp., % cover of substrate types, and plant measurements for making biomass estimates with allometric equations, but such estimates are not presented. The original raw cross-section data for these sites has been adjusted to align profiles for consecutive year comparisons at each cross-section location to correct for imprecision in the survey methodology. John Faustini, in 1998, further corrected this cross-section data from 1978-1998 for the five main sites in database GS019. Arianna Goodman, in 2021, performed additional corrections on the data, including more recent collections, 1978-2011, also in database GS019. The Shorter Creek cross-section surveys took place in 1978-1982 only. The Shorter Creek cross-section surveys took place in 1978-1982 only.

本数据库包含位于H.J.安德鲁斯实验森林（H.J. Andrews Experimental Forest）内3至5级河道的5个研究点位（河段）的周期性复测横断面剖面数据，时间跨度为1978年至今；同时还收录了该森林内肖特溪（Shorter Creek）以及哈根块RNA（Hagan Block RNA）区域内哈根溪（Hagan Creek）的两个点位（北支、南支）的历史数据。各点位均设置有10至20个间距约10至50米的横断面。观测内容包括：以河道两岸永久基准站间水平线为参照的横断面几何形态测量结果、基于卵石计数的底质类型与基岩出露范围记录，以及研究点位的影像资料。采样工作在2000年前主要按年度开展，2000年之后则根据资助经费情况与洪水引发的地貌变化情况灵活开展，目前要求至少每5年开展一次采样。数据表涵盖以下四类内容：1. 固定端点间的高程与距离测量数据；2. 用于颗粒物粒径分析的卵石计数数据；3. 裸露基岩范围的测量数据；4. 仅于1984年采集的植被相关数据，包括物种覆盖率、底质类型覆盖率，以及可用于通过异速生长方程估算生物量的植物测量数据，但未提供具体的生物量估算结果。为修正原始测量方法的精度误差，已针对每个横断面位置的原始剖面数据进行调整，以实现同位置不同年份剖面的对比分析。1998年，约翰·福斯蒂尼（John Faustini）针对GS019数据库中的5个主要点位，进一步修正了1978-1998年的横断面数据。2021年，阿里安娜·古德曼（Arianna Goodman）对包括1978-2011年在内的近年采集数据进行了额外修正，该数据集同样隶属于GS019数据库。肖特溪的横断面测量仅在1978-1982年间开展。肖特溪的横断面测量仅在1978-1982年间开展。