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.
Arianna Goodman, Catalina Segura, Craig Creel, Donald L. Henshaw, Frederick J. Swanson, Futoshi Nakamura, George W. Lienkaemper, Gordon E. Grant, John M. Faustini, Julia A. Jones, Mary Ann Madej, Sherri L. Johnson
This study was established to monitor long-term changes in channel cross-sectional geometry (width, depth) in response to storms and change in the disposition of large organic debris in a range of stream sizes beginning in 1978. These observations can be used to assess change in sediment storage within the sample reach and change in habitat structure. Particle counts are performed to assess bed material surface particle size and its variability at each cross section location beginning with the 1995 survey. Two Hagan Creek sites (North and South Forks) were designed to document channel changes following debris removal and streamside logging in the riparian corridor; however, logging was indefinitely postponed, and measurements were discontinued in 1986. Vegetation cover was described on the Mack Creek clearcut site along transects adjacent to the stream profiles in a 1984 survey with the intent that if major channel change occurs, it would be possible to assess effects on riparian vegetation. The Shorter Creek stream profiles were established to study the influence and downstream effects of pulling large wood (greater than 10 cm) from a stream reach on the movement of sediment, and were surveyed before and after wood pulling in 1978 and annually through 1982.