Access the full text.
Sign up today, get DeepDyve free for 14 days.
References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.
Abstract: Forest roads can be a major contributor of sediment entering streams and estuaries. Road restoration and removal has been shown to be effective in reducing sediment delivery over decadal time spans. However, few studies have been conducted to quantify and characterize short-term (1-3 yr) channel adjustment after removal of stream crossing fill material and reconstruction of former stream channels. This evaluation is important for managers needing to assess impacts, cost, and benefits of stream crossing removal. This study examines 20 road stream crossings by surveying channel adjustments and determining rilling and gullying delivery volumes, channel substrate changes, and the role of rock placed in reconstructed channels at Redwood National and State Parks, California, USA. Erosion and channel incision were significantly higher at crossings in the 1st year following removal than at older crossings. First year crossings yielded an average of 7.71 m 3 of erosion per crossing, while the 2nd- and 3rd-year crossings showed a net gain of 0.08 m 3 of sediment (indistinguishable from 0). Eighty-six percent of the erosion could be attributed to channel incision and bank erosion. The remaining 14% originated from rilling, gullying, and side-slope failures. Coarsening of channel substrate was most pronounced in the 1st year after removal, and the 1st storms of the year were most important in mobilizing sediment. This study underlines the importance of excavating to bedrock or coarse material when recreating a streambed, and the identification of bulges (short convex segments) in the channel profile that are likely to erode.
Ecological Restoration – University of Wisconsin Press
Published: Nov 5, 2011
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.