Current Postgraduate Students
Dr Louise Bracken
My research is focused primarily upon the dynamic and complex relationship within rivers between the processes that generate and supply fine sediment, and those that move the sediment through the river system. In recent years it has become increasingly apparent that fine sediment is a key factor in the environmental quality of a river system, as it plays an important role in determining the nature and rate of transport of nutrients and contaminants. Hence, the understanding of possible sources, pathways and fates of fine sediment is now recognised as an important element of water resource management. Within this framework my research has three broad themes: (1) spatial variations in runoff and sediment transfer, including the pathways that runoff and sediment follow (hydrological connectivity); (2) the supply of sediment from gullies and bank erosion; and (3) practices of undertaking interdisciplinary research to bring together the scientific outputs from the natural sciences with those of social sciences.
1) Spatial variations in runoff and sediment transfer
My research on the spatial variation in runoff and sediment transfer is conducted in both semi-arid and temperate environments. This research, which has involved detailed field monitoring and laboratory analyses, has allowed a new level of quantification of the rates at which sediment enters and moves through the evolving gully system, and has permitted the development of new models to understand the processes through which sediment delivery and transport occur.
2) The supply of sediment from gullies and bank erosion
The supply of sediment from gullies in semi-arid environments is important because many arid areas appear to be entering a new phase of dynamism. My research on this topic has helped in determining and defining the factors that control the generation of gullies, and in determining the response of gullies in terms of morphology and channel-form to environmental perturbations. My research on bank erosion as a sediment source was has helped to quantify the volume of material added by river channel instability.
3) Practices of undertaking interdisciplinary research
This research theme focuses on the development of an interdisciplinary framework for the investigation of earth surface systems. This work is critically important because it utilises a holistic approach that draws upon the skills and practices from different disciplines to produce new levels of understanding of problems facing the global community, most notably the impact of policy and anthropogenic behaviour on environmental processes.
- Catchment, River and Hillslope Science (CRHS)
- Mr Matthew Perks
- Miss Matilda Biddulph
- Mr Christopher Murphy
- Miss Patsy Ryan
- Mr Jitendra Thakur
- Ms Pammi Sinha
- Mr Mike Norbury
- Miss Sophie Tindale
- Bull, L.J. & Kirkby, M.J. (2002). Dryland Rivers: Hydrology and Geomorphology of Semi-Arid Channels. Wiley.
- Bracken, L.J. & Wainwright, J. (2008). Equilibrium in the balance? Implications for landscape evolution from dryland environments. In Landscape Evolution: Denudation, Climate and Tectonics Over Different Time and Space Scales. Gallagher, K., Jones, S.J. & Wainwright, J. London.: Geological Society of London. 296: 29-46.
- Bull, L.J. & Kirkby, M.J. (2002). Channel Heads and Channel Extension. In Dryland rivers; Hydrology and Geomorphology of Semi-Arid Channels. Bull, L.J. & Kirkby, M.J. Wiley. 263-298.
- Bull, L.J. & Kirkby, M.J. (2002). Dryland River Characteristics and Concepts. In Dryland Rivers: Hydrology and Geomorphology of Semi-Arid Channels. Bull, L.J. & Kirkby, M.J. Wiley. 3-16.
Journal papers: academic
- Carrithers, M., Bracken, L.J. & Emery, S. (2011). Can a Species Be a Person? A Trope and Its Entanglements in the Anthropocene Era. Current Anthropology 52(5): 661-685.
- Smith, M.W., Cox, N.J. & Bracken, L.J. (2011). Modeling depth distributions of overland flows. Geomorphology 125(3): 402-413.
- Smith, M.W., Cox, N.J. & Bracken, L.J. (2011). Terrestrial laser scanning soil surfaces: a field methodology to examine soil surface roughness and overland flow hydraulics. Hydrological Processes 25(6): 842-860.
- Bolland, JD, Bracken, LJ, Martin, R & Lucas, MC (2010). A protocol for stocking hatchery reared freshwater pearl mussel Margaritifera margaritifera. Aquatic Conservation: Marine and Freshwater Ecosystems 20(6): 695-704.
- Smith, M.W., Bracken, L.J. & Cox, N.J. (2010). Toward a dynamic representation of hydrological connectivity at the hillslope scale in semiarid areas. Water Resources Research 46(12): W12540.
- Raven, E.K., Lane, S.N. & Bracken, L.J. (2010). Understanding sediment transfer and morphological change for managing upland gravel-bed rivers. Progress in Physical Geography 34(1): 23-45.
- Kirkby, M.J. & Bracken, L.J. (2009). Gully processes and gully dynamics. Earth Surface Processes And Landforms 34(14): 1841-1851.
- Bracken, L.J. & Oughton, E.A. (2009). Interdisciplinarity within and beyond geography: introduction to Special Section. Area 41(4): 371-373.
- Oughton, E.A. & Bracken, L.J. (2009). Interdisciplinary research: framing and reframing. Area 41(4): 385-394.
- Raven, E.K., Lane, S.N., Ferguson, R.I. & Bracken, L.J. (2009). The spatial and temporal patterns of aggradation in a temperate, upland, gravel-bed river. Earth Surface Processes And Landforms 34(9): 1181-1197.
- Wishart, D., Warburton, J. & Bracken, L. (2008). Gravel extraction and planform change in a wandering gravel-bed river: The River Wear, Northern England. Geomorphology 94: 131-152.
- Bracken, L.J. (nee Bull), Cox, N.J. & Shannon, J. (2008). The relationship between rainfall inputs and flood generation in south-east Spain. Hydrological Processes 22(5): 683-696.
- Smith, M.W., Cox, N.J. & Bracken, L.J. (2007). Applying flow resistance equations to overland flows. Progress in Physical Geography 31(4): 363-387.
- Bracken, LJ & Croke, J (2007). The concept of hydrological connectivity and its contribution to understanding runoff-dominated geomorphic systems. Hydrological Processes 21(13): 1749-1763.
- Bracken, L.J. & Croke, J. (2007). The concept of hydrological connectivity and its contribution to understanding runoff-dominated geomorphic systems. Hydrological Processes 21(13): 1749-1763.
- Reaney, S.M., Bracken, L.J. & Kirkby, M.J. (2007). Use of the Connectivity of Runoff Model (CRUM) to investigate the influence of storm characteristics on runoff generation and connectivity in semi-arid areas. Hydrological Processes 21: 894-906.
- Bracken, L.J. & Oughton, E.A. (2006). 'What do you mean?' The importance of language in developing interdisciplinary research. Transactions of the Institute of British Geographers 31(3): 371-382.
- Bracken, L.J. & Wainwright, J. (2006). Geomorphological equilibrium: myth and metaphor?. Transactions of the Institute of British Geographers 31(2): 167-178.
- Bracken, L.J. & Kirkby, M.J. (2005). Differences in hillslope runoff and sediment transport rates within two semi-arid catchments in southeast Spain. Geomorphology 68(3-4): 183-200.
- Kirkby, M.J. & Bracken, L.J. (2005). Modelling Hillslope Connectivity and Channel interactions in Semi-arid Areas: Implications for Hillslope Restoration Following Land Abandonment. International Association of Hydrological Processes 299: 3-15.
- Kirkby, M.J., Bracken, L.J. & Shannon, J. (2005). The influence of rainfall distribution and morphological factors on runoff delivery from dryland catchments in SE Spain. Catena 62: 136-156.
- Bracken, L.J. & Mawdsley, E. (2004). 'Muddy glee': rounding out the picture of women and physical geography fieldwork. Area 36(3): 280-286.
- Kirkby, M.J., Bull, L.J., Poesen, J. & Vandekerckhove, L. (2003). Observed and modelled distributions of channel and gully heads - with examples from SE Spain and Belgium. Catena 50(2-4): 415-434.
- Bull, L.J., Kirkby, M.J., Shannon, J. & Dunsford, H. (2003). Predicting Hydrological Similar Surfaces (HYSS) in semi-arid environments. Advances in Monitoring and Modelling 1(2): 1-26.
- Kirkby, M.J. & Bull, L.J. (2003). Thresholds of gully initiation: a comparison of field data and model predictions. Catena Special Issue 50(2-4): 415-434.
- Kirkby, M.J., Bracken, L.J. & Reaney, S. (2002). The influence of land use, soils and topography on the delivery of hillslope runoff to channels in SE Spain. Earth Surface Processes and Landforms 27(13): 1459-1473.
- Kirkby, MJ & Bull, LJ (2000). Some factors controlling gully growth in fine-grained sediments: a model applied in southeast Spain. Catena 40(2): 127-146.
- Bull, LJ, Kirkby, MJ, Shannon, J & Hooke, JM (2000). The impact of rainstorms on floods in ephemeral channels in southeast Spain. Catena 38(3): 191-209.
- Bull, LJ & Kirkby, MJ (1997). Gully processes and modelling. Progress In Physical Geography 21(3): 354-374.
- Bull, LJ (1997). Magnitude and variation in the contribution of bank erosion to the suspended sediment load of the River Severn, UK. Earth Surface Processes And Landforms 22(12): 1109-1123.
- Bull, LJ (1997). Relative velocities of discharge and sediment waves for the River Severn, UK. Hydrological Sciences Journal-journal Des Sciences Hydrologiques 42(5): 649-660.
- Couperthwaite, JS, Bull, LJ, Lawler, DM & Harris, NM (1996). Downstream change in channel hydraulics and river bank erosion rates in the Upper Severn, UK. Hydrology In The Celtic Countries (79): 93-100.
- Bull, LJ, Lawler, DM, Leeks, GJL & Marks, S (1995). Downstream changes in suspended sediment fluxes in the River Severn, UK. Effects Of Scale On Interpretation And Management Of Sediment And Water Quality (226): 27-37.