Logging-related increases in stream density in a northern California watershedAuthor(s): Matthew S. Buffleben
Source: In: Standiford, Richard B.; Weller, Theodore J.; Piirto, Douglas D.; Stuart, John D., tech. coords. Proceedings of coast redwood forests in a changing California: A symposium for scientists and managers. Gen. Tech. Rep. PSW-GTR-238. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 33-40
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: View PDF (245.72 KB)
Although many sediment budgets estimate the effects of logging, few have considered the potential impact of timber harvesting on stream density. Failure to consider changes in stream density could lead to large errors in the sediment budget, particularly between the allocation of natural and anthropogenic sources of sediment.
This study conducted field surveys in randomly selected catchments in two managed and one old-growth watershed to determine the location of the channel's origins in the catchments. The drainage areas for identified channel heads were then delineated using a 1 m digital elevation model derived from laser altimetry. The two managed watersheds were heavily impacted by previous logging activities, particularly by tractor operations used to yard the timber out of the watersheds. The channel heads in the managed watersheds had smaller drainage areas than channels in a nearby old-growth watershed. The management activities led to a tripling of the drainage density in the managed watersheds.
Timber harvesting and the construction of skid trails used to transport timber to the road system led to increases in peak flow, ground water interception, soil compaction and drainage diversion, which reduced the drainage area necessary to initiate stream channels. Furthermore, it appears that recent ground-based yarding operations have further extended stream channels upslope, potentially creating additional sources of sediment for downstream receptors. Although these results may be unique to these watersheds, the changes in drainage density due to management activities found here emphasize the need to compare managed watersheds with undisturbed watersheds before using the current drainage network as a base-line for estimating chronic sources of sediment like bank erosion.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationBuffleben, Matthew S. 2012. Logging-related increases in stream density in a northern California watershed. In: Standiford, Richard B.; Weller, Theodore J.; Piirto, Douglas D.; Stuart, John D., tech. coords. Proceedings of coast redwood forests in a changing California: A symposium for scientists and managers. Gen. Tech. Rep. PSW-GTR-238. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. pp. 33-40.
Keywordschannel incision, drainage density, sediment budget
- The incidence and role of gullies after logging in a coastal redwood forest
- Watershed-scale evaluation of Humboldt Redwood Company’s Habitat Conservation Plan timber harvest best management practices, Railroad Gulch, Elk River, California
- Using Scientific Information to Develop Management Strategies for Commercial Redwood Timberlands
XML: View XML