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Title: Modern depositional processes in a confined bedrock setting: benches of the Shoalhaven river
Authors: Kermode, SJ
Cohen, TC
Reinfelds, IV
Nanson, GC
Jones, BJ
Keywords: Meetings
New South Wales
Alluvial deposits
Issue Date: 27-Aug-2013
Publisher: International Association of Geomorphologists
Citation: Kermode, S. J., Cohen, T. C., Reinfelds, I. V., Nanson, G. C., & Jones, B. G. (2013). Modern depositional processes in a confined bedrock setting: Benches of the Shoalhaven River. Paper presented at the 8th International conference (AIG) on Geomorphology, Paris - 2013, 27-31 August.
Abstract: The 8th International Conference on Geomorphology of the International Association of Geomorphologists (IAG/AIG) took place in Paris at the Cité des Sciences de La Villette from August 27 to 31, 2013. The main topic of this 8th Conference was "Geomorphology and Sustainability". Organized by the Groupe Français de Géomorphologie (GFG) and open to all scientists and practitioners, this Conference included 26 scientific sessions, 5 key-note lectures and one Workshop devoted to Young Geomorphologists. YOUNG GEOMORPHOLOGISTS SESSION Convenors: Etienne COSSART, Johnny DOUVINET & Stuart LANE This session welcomed young scientists (PhD students, post-doctorates) who were interested in discussing new approaches and methods in geomorphology (spatial analysis, mathematical modelling, conceptual and quantitative approaches and links between them). Presentations could focus on any component of the discipline and related earth sciences (hydrology, Quaternary geology, soil sciences, etc.), and be either fundamental or applied. Preliminary results and discussions of fieldwork and methodological strategies (observation, data acquisition before modelling) were appropriate, as well as methodological developments, such as geomorphic mapping through GIS. Equally, numerical simulation approaches such as those linked to complexity theory (agent-based modelling, Cellular Automata) or physically-based methods for specific process representations have been welcomed. The participants of this session have been invited to participate to the intensive course for young geomorphologists held at the end of the conference (from September 1st to 3rd).
The lower Shoalhaven River provides an opportunity to examine bench processes in a confined setting. Stratigraphic analysis of trenches and augur holes, ground penetrating radar, Hec-RAS modelling and geochronological techniques combine to identify that benches of multiple levels along Bull Reach are composed of coarse material and have been extensively eroded and reworked by modern events. Kermode et al. (2012) established the long-term polycyclical nature of the higher alluvial surfaces (up to 193 ka in age), and this is contrasted with the youth of the lower inset alluvial surfaces, which are shown to be less than 270 years in age. This study evaluates the relative significance of both flood regime and effects of European settlement on the geomorphic effectiveness of high magnitude events and investigates the characteristics of bench formation in this confined setting. It characterises the nature of depositional events and the relationship between facies at an event scale. Using Hec-RAS modelling, events of different recurrence intervals are compared to explore the relative impact of varying flood magnitudes. The results bring into question the theory that inundation frequencies of these surfaces are constant, or associated with formative processes.
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