Effect of ground cover on splash and sheetwash erosion over a steep forested hillslope: a plot-scale study

Article

Ghahramani, Afshin, Ishikawa, Yoshiharu, Gomi, Takashi, Shiraki, Katsushige and Miyata, Shusuke. 2011. "Effect of ground cover on splash and sheetwash erosion over a steep forested hillslope: a plot-scale study." Catena. 85 (1), pp. 34-47. https://doi.org/10.1016/j.catena.2010.11.005
Article Title

Effect of ground cover on splash and sheetwash erosion over a steep forested hillslope: a plot-scale study

ERA Journal ID1715
Article CategoryArticle
AuthorsGhahramani, Afshin (Author), Ishikawa, Yoshiharu (Author), Gomi, Takashi (Author), Shiraki, Katsushige (Author) and Miyata, Shusuke (Author)
Journal TitleCatena
Journal Citation85 (1), pp. 34-47
Number of Pages14
Year2011
PublisherElsevier
Place of PublicationNetherlands
ISSN0341-8162
1872-6887
Digital Object Identifier (DOI)https://doi.org/10.1016/j.catena.2010.11.005
Web Address (URL)http://www.sciencedirect.com/science/article/pii/S034181621000175X
Abstract

The contributions and relationships of erosion by splash and overland flow over a steep slope in a Japanese beech forest in plots with different percentages of ground cover were examined. Three erosion plots (2 m wide × 5 m long) with average understory coverage of 1%, 45%, and 94% were installed. Sediment transported by rain splash and by overland flow was sampled separately. For the plots with sparse, moderate, and high understory coverage, the average proportions of splash soil to total soil erosion during the monitoring period were 16%, 32%, and 18%, respectively. A significant correlation between the amount of splash soil and precipitation was found in the plots with 1% and 45% understory coverage, whereas no statistical relationship was identified for the plot with high understory coverage. At the sparse ground cover plot showing the largest sediment movement, the contribution of splash transport decreased with increasing precipitation. The amount of sheetwash erosion was significantly correlated with the amount of splash soil under the condition of sparse ground cover. This relationship was more pronounced during high precipitation events and the rainy season. Splash contribution to the sediment transport was in the range of 0.8%–76.7%, 2.8%–81% and 2.1%–60.8% for plot with high, moderate and low ground cover, respectively. The sparse ground cover showed the largest variation of splash and sheetwash contribution in soil erosion. This variability was due to variation in ground cover and soil surface wetness condition which led to a variation of detachment and non-linear relationship of sheetwash splash.

Keywordssplash erosion; sheetwash; overland runoff; sediment transportation; forested steep hillslope
ANZSRC Field of Research 2020370704. Surface water hydrology
419999. Other environmental sciences not elsewhere classified
410699. Soil sciences not elsewhere classified
370901. Geomorphology and earth surface processes
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Byline AffiliationsTokyo University of Agriculture and Technology, Japan
Kyoto University, Japan
Institution of OriginUniversity of Southern Queensland
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