Journal article

Multiple runoff processes and multiple thresholds control agricultural runoff generation

Shabnam Saffarpour, Andrew W Western, Russell Adams, Jeffrey J McDonnell



Thresholds and hydrologic connectivity associated with runoff processes are a critical concept for understanding catchment hydrologic response at the event timescale. To date, most attention has focused on single runoff response types, and the role of multiple thresholds and flow path connectivities has not been made explicit. Here we first summarise existing knowledge on the interplay between thresholds, connectivity and runoff processes at the hillslope-small catchment scale into a single figure and use it in examining how runoff response and the catchment threshold response to rainfall affect a suite of runoff generation mechanisms in a small agricultural catchment. A 1.37 ha catchment in..

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University of Melbourne Researchers


Awarded by Australian Research Council

Funding Acknowledgements

The project was funded by the Australian Research Council (grant DP0987738). Shabnam Saffarpour was supported by an International Postgraduate Research Scholarship (IPRS) from the Australian Government and an International Research Scholarship from the University of Melbourne (MIRS). Peter and Wilma Mackay provided access to their farm for the study. Many people helped in the field, especially Rodger Young, Lucas Dowell, Olaf Klimczak and Jacqui Lloyd. The water samples were analysed for <SUP>18</SUP>O and delta<SUP>2</SUP>H, either by Ian Carwright's Earth Sciences laboratory, Monash University or by Russell Drysdale's isotope laboratory at the University of Melbourne. The chloride data were analysed by Michael Grace's Water Studies Laboratory, Monash University. Anthony Weatherly assisted with soil interpretation at the site.