Relative contributions of runoff and sediment from sources within a road prism and implications for total sediment delivery

Croke, Jacky, Mockler, Simon, Hairsine, Peter and Fogarty, Peter (2006) Relative contributions of runoff and sediment from sources within a road prism and implications for total sediment delivery. Earth Surface Processes and Landforms, 31 4: 457-468. doi:10.1002/esp.1279


Author Croke, Jacky
Mockler, Simon
Hairsine, Peter
Fogarty, Peter
Title Relative contributions of runoff and sediment from sources within a road prism and implications for total sediment delivery
Journal name Earth Surface Processes and Landforms   Check publisher's open access policy
ISSN 0197-9337
1096-9837
Publication date 2006
Year available 2006
Sub-type Article (original research)
DOI 10.1002/esp.1279
Open Access Status
Volume 31
Issue 4
Start page 457
End page 468
Total pages 12
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley and Sons Ltd.
Collection year 2006
Language eng
Formatted abstract
This study examines runoff and sediment generation rates within the road prism on unsealed road segments in the Cuttagee Creek catchment near Bermagui in New South Wales, Australia. A large (600 m2) rainfall simulator was used to measure runoff and sediment yields from each of the potential sediment and runoff sources and pathways. These included the road surface, table-drain, upslope contributing area and cutslope face, and the entire road segment as measured at the drain outlet. Experiments were conducted on two major types of road (ridge-top and cut-and-fill) of varying traffic usage and maintenance standard for two 30-minute simulations of increasing rainfall intensity. From the range of possible sources within the road prism, the road surface produced the dominant source of excess runoff and sediment at each site with limited contributions from the table-drain, cutslope face or contributing hillslope. Sediment generation varied significantly with road usage and traffic intensity. Road usage was strongly related to the amount of loose available sediment as measured prior to the experiments. Table-drains acted primarily as sediment traps during the low rainfall event but changes in sediment concentration within the drains were observed as runoff volumes increased during the higher rainfall event of 110 mm h-1, releasing sediment previously stored in litter and organic dams. The experiments demonstrate the potential roles of various features of the road prism in the generation and movement of sediment and water.
Keyword Forestry
Rainfall simulation
Roads
Runoff generation
Sources of sediment and water within a road prism
Surface erosion
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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Created: Wed, 26 Nov 2014, 15:38:05 EST by Helen Smith on behalf of School of Geography, Planning & Env Management