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Oct 16, 2012Keywords:
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Main Article Content
The Role of Undercutting of Banks in the Collapse and Evolution of Small Channels
Abstract
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.
