THE ROLE OF UNDERCUTTING OF BANKS IN THE COLLAPSE AND EVOLUTION OF SMALL CHANNELS.
DOI:
https://doi.org/10.4314/njt.252.540Keywords:
Rill bank collapse, Undercut, Headcut, Slope, Stability, EvolutionAbstract
The influence of undercutting in rill banks on the development and collapse of rill banks and on the subsequent evolution of the rill channels were investigated in a laboratory flume. Undercutting of rill banks were observed to develop in rill channels by 'reverse roller' effect of plunging water jet into scour holes, cutting the underside of the head cut wall. The extent of undercutting and the rate of drawdown of water into the rill influenced the collapse of the rill wall. Slumping was the predominant mode of failure of rill banks from this study, although other types of failures were observed. The type and mode of failure determined the amount of soil that collapsed into the rill. This in turn greatly influenced the evolution of the rill channel. Rill bank collapse was observed to contribute as much as 53% of the total sediments from the rill. It is therefore emphasized that its effect be included in present-day process- based rill erosion models.
Downloads
Issue
Section
License
The contents of the articles are the sole opinion of the author(s) and not of NIJOTECH.
NIJOTECH allows open access for distribution of the published articles in any media so long as whole (not part) of articles are distributed.
A copyright and statement of originality documents will need to be filled out clearly and signed prior to publication of an accepted article. The Copyright form can be downloaded from http://nijotech.com/downloads/COPYRIGHT%20FORM.pdf while the Statement of Originality is in http://nijotech.com/downloads/Statement%20of%20Originality.pdf
For articles that were developed from funded research, a clear acknowledgement of such support should be mentioned in the article with relevant references. Authors are expected to provide complete information on the sponsorship and intellectual property rights of the article together with all exceptions.
It is forbidden to publish the same research report in more than one journal.