Fall directions and breakage of trees along streams in the Pacific Northwest, 2000-2002

  • Creator(s): Stanley V. Gregory, Daniel J. Sobota
  • PI(s): Stanley V. Gregory
  • Originator(s): Daniel J. Sobota
  • Other researcher(s):
  • Dates of data collection: Jan 9 2000 - Jun 21 2002
  • Data collection status: Study collection is completed and no new collection is planned
  • Data access: Online
  • Last update: May 17 2004 (Version 2)
<Citation>     <Acknowledgement>     <Disclaimer>    
Gregory, S.; Sobota, D. 2004. Fall directions and breakage of trees along streams in the Pacific Northwest, 2000-2002. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: Accessed 2023-12-11.
Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.
While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is". The Andrews LTER shall not be liable for damages resulting from any use or misinterpretation of data sets.
This database contains data on patterns of fall and breakage by riparian trees along streams in the Pacific Northwest. Data in these tables were collected from 2000-2002. Two tables are included. (1) site descriptions and (2) tree fall. The site descriptions table contains information on the geographic location (general physiographic location, political state, and river drainage basin), physical aspects of the channel (active channel width, valley floor width, and channel gradient), and structure of the riparian forest (general age, tree density and basal area, and average tree height/diameter breast height ratio of down trees at the site). Physical aspects of the channel are average values taken at 20-m intervals within the site except for channel gradient, which are average values for 100-m intervals. Stand density (trees per ha) and basal area (m2 per ha) were measured with the point- center quarter method, please see Dan Sobota's Master's thesis (Pub 4337) for more details. The tree fall table contains information on individual trees measured at each site in the study. Species, geomorphic landform of rooting position, streamside location, and type of tree fall (stem break or root throw event) are descriptive variables for each tree. Tree height, diameter at breast height and diameter at the top of the tree describe tree size. Side slope at tree base and distance from the active channel describe the physical location of the tree along the stream. Number of pieces only includes those produced when the tree first fell. Fall direction is normalized to 0 degrees upstream and 90 degrees directly towards the stream for trees located on both stream banks.

Study Description Taxonomic Hierarchy Download Study Location Information: (CSV)
Ecological Metadata Language: (EML)
1Site description data (Sep 1 2000 - Mar 1 2003)METADATADATA
Geographic, physical and forest setting of study sites
2Tree fall data (Sep 1 2000 - Mar 1 2003)METADATADATA
Information on fallen tree characteristics, fall directions, and breakage patterns

 Sobota, Daniel J. 2003, Fall directions and breakage of riparian trees along streams in the Pacific Northwest (Pub. No: 3939)