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AGU 2014
September 252014

I am co-convening a session on the collection and application of high resolution topographic and flow data at the AGU conference in San Francisco 15th – 19th December. A link to the session will be posted as soon as AGU confirm the programme in early October.

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Details of our NERC funded research looking at how the development of particle scale structure controls river scale morphology.

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In collaboration with Steve Darby (University of Southampton), Massimo Rinaldi (University of Florence) and Liliana Teruggi (also Florence) we have been monitoring a site on the Cecina River in Tuscany, Italy for a number of years. The dataset consists of high resolution topographic bank surveys undertaken using photogrammetry (2003 – 2007) and thereafter the Geography and Environmnet Terrestrial Laser Scanner. The British Society for Geomorphology awarded me £1.3K to re-visit the site in July 2011 to undertake another TLS survey.

Recent progress in modelling rates of hydraulic river bank erosion [Darby et al., 2010] has indicated that the form roughness induced by natural topographic bank features (slumps, embayments, etc.) is a major component of the spatially-averaged total shear stress. The skin friction component is found to be typically an order of magnitude less than the total stress, such that the form roughness provides an important control on self-limiting bank erosion rates. However, given that the form roughness is induced by topographic forms that are themselves created by hydraulic bank erosion, it remains unclear whether and how bank roughness co-evolves with the erosion process.

In an attempt to address this issue we are evaluating the temporal evolution of bank roughness parameterson the Cecina River. In our study bank ‘roughness profiles’ are extracted from the annual series of high-resolution DEMs of the river bank. The DEMs are used to quantify accurately the spatial trends and amounts of annual bank erosion observed in relation to the hydrological regime of the river, and are compared to the temporal variations in river bank form and skin roughness components as the bank erodes. The data are being used to evaluate the extent to which there is a dynamic feedback between the bank erosion process and bank form roughness and a paper for submission to Earth Surface Processes and Landforms is in preparation.

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An overview of our NERC funded research into sediment dynamics on an Asian mega-river – the Mekong.

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Reconstruction of long term palaeo-environmental history of the River Spey catchment using a novel modelling method that seeks to replicate sedimentary archives retrieved from Loch Insh.

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Tephra covered glaciers in Iceland reveal complex spatial feedbacks of tephra redistribution, ice melt and surface roughness patterns.

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  • AGU 2014

    AGU 2014

    Conference

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  • NERC funded research: sediment structure and river morphology

    NERC funded research: sediment structure and river morphology

    Research Project

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  • Evolution of roughness on eroding riverbanks

    Evolution of roughness on eroding riverbanks

    Research Project

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  • NERC funded research: STELAR-S2S

    NERC funded research: STELAR-S2S

    Research Project

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  • Sink to source modelling of sedimentary histories

    Sink to source modelling of sedimentary histories

    Research Project

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  • Glacier surface roughness and ablation patterns

    Glacier surface roughness and ablation patterns

    Research Project

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