Water flux and sediment transport within a forested landscape: the role of connectivity, subsurface flow, and slope length scale on transport mechanism

Article

Ghahramani, Afshin and Ishikawa, Yoshiharu. 2013. "Water flux and sediment transport within a forested landscape: the role of connectivity, subsurface flow, and slope length scale on transport mechanism." Hydrological Processes. 27 (26), pp. 4091-4102. https://doi.org/10.1002/hyp.9791
Article Title

Water flux and sediment transport within a forested landscape: the role of connectivity, subsurface flow, and slope length scale on transport mechanism

ERA Journal ID1948
Article CategoryArticle
AuthorsGhahramani, Afshin (Author) and Ishikawa, Yoshiharu (Author)
Journal TitleHydrological Processes
Journal Citation27 (26), pp. 4091-4102
Number of Pages12
Year2013
Place of PublicationUnited Kingdom
ISSN0885-6087
1099-1085
Digital Object Identifier (DOI)https://doi.org/10.1002/hyp.9791
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1002/hyp.9791/full
Abstract

The connectivity and upscaling of overland runoff and sediment transport are important issues in hillslope hydrology to identify water flux and sediment transport within landscape. These processes are highly variable in time and space with regard to their interactions with vegetation and soil surface conditions. The generation of overland runoff and its spatial connectivity were examined along a slope to determine the variations in the transport mechanism of runoff and soil particles by rain splash and overland runoff. Field experiments were conducted by erosion plots on a steep hillslope at lengths of 5, 10, and 15 m. The overland runoff connectivity and flow transport distance decreased with the slope length, while spatial variability of infiltration increased significantly with the slope length. Observation of subsurface flow revealed that surface soil and litter layer could have important role in water transport. However, the surface soil water content and water flux transport along the slope was highly variable for different storm events; the variability was related to the complexity of the system, mainly by way of the initial wetness conditions and infiltration characteristics. Only net rain-splashed soil was measurable, but examination of the water flux, overland runoff and sediment transport connectivity, characteristics of sheetwash, and the variability in spatial infiltration indicated an increase in the contribution of the rain splash transport mechanism along the slope.

Keywordshillslope; scaling; overland runoff; subsurface runoff; rain splash; sheetwash; HYDRUS
ANZSRC Field of Research 2020410406. Natural resource management
410699. Soil sciences not elsewhere classified
379999. Other earth sciences not elsewhere classified
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Byline AffiliationsCommonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Tokyo University of Agriculture and Technology, Japan
Institution of OriginUniversity of Southern Queensland
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