2009 - 2012 DEFRA Funded Project in collaboration with ADAS, CEH adn QMUL. Increasing teh Evidence base for the ecological impact of agriculturally derived sediments. Porf Sear leads the teams responsible for a) Development of a national scale typology of river sensitivity to fine sediment impacts; b) development of a major national facility for simulating spawning habitats; c) experiment to determine impacts of different fine sediment loads derived from different sources on incubating salmonids, Grayling and Dace; d) Deveopment in collaboration with Dr D.J.Smallman; Ann Stringfellow (CEES) of a methodology for fingerprinting organic sediments in spawning gravels; e) measurment of sediment oxygen demand of fine sedimnets in spawning gravels; f) numericalmdoelling of fine sediment routing and infiltration into spawning habitats based on the ADAS PSYCHIC sediment delivery model.
2009-11 - NERC Project on the impacts of high magnitude flood events on flood routing and physical habitats. PI in collaboration with Bristol University. The project is based around a comprehensive re-survey of the River Derwent, Cumbrian following the November 2009 flooding. A combination of repeat Fluvial Audit, topographic survey, lake coring and hydraulic modelling has ben used to construct a sediment budget for the 2005 and 2009 flood events. This has been linked to the changes in physical habitat following major morphodynamic adjustments. 2-Dimensional hydrodynamic modelling is being used to quantify the impacts of the 2009 floods on flood conveyance. The project is also investigating the role of large wood on physical habitat and morphodynamic changes, and the use of CAT-Scanning and ITRACs analysis for determinination of flood chronologies from lake Basenthwaite.
2008-10 Engish Heritage and Esmee Fairbarin Foundation; Dunwich Project. On-going project to map, visualise and understand the former medieval town of Dunwich in relation to the process of long term coastal erosion and sea level change. The project has led to major international media interest, including work or the BBC. The project has produced the first ever town sale survey fothe Dunwich site, including the identification of four former religeous buildings. Collaboration with MaCartney AS has led to the first ever use of DIDSON acoustic imaging equipment on a non-wreck archaeological site. Further information is availabel from the project website http://www.dunwich.org.uk/.
2009- Atlantic Salmon Trust - Deriving past Salmon populations from lake sediment records. This project in collaboration with the BGS, is developing methods for deriving proxy indicators of Atlatnic Salmon populations based on novel stabel isotope and ADNA preserved in lake sediments. Initial work on Loch Insh, Speycatchment, shows strong correlations between historic trends in salmon popoulations and species of diatom and marine derived nutrients.
2009 - British Society for Geomorphology 50th anniversary Project to develop a national website and mapping programe for UK geomorphology. The prject is led by Professor Janet Hooke and involves Prof Ken Gregory, Prof Bernie xxx and Dr xxx. The projetc aims to develop a major national resource for geomorphology based on interactive web-delivered mapping of the landsdcape of Britain.
2008- Morphodynamics and salmon habitat changes in the braided river Feshie. This work in colaboration with Dr Joe Wheaton (Utah State), Prof James Brasington (Christchurch, NZ) and Stuttgart University Hydraulics lab, combines accurate topographic survey of changes in channel form with 2-D CFD modelling to create the physical habitat dynamics for Atlatnic salmon life stages. The aplication of the CASIMIR fuzzy habitat model enables uncertainty within the habitat preferences of ifferernt lifestages to be accounted or in the modelling.
2008-9 NERC Project on hydraulicsof complex flows over wooded floodplain surfaces (Co-I, Prof Steve Darby PI). This project utilised novel Terrestrial Laser Scanning coupled to Laser-synthing to genreate millimetre accuracte models of complex wooded floodplain surfaces. The Laser-sythed models were then subjectd to controlled flows within the Chilworth Hydraulis Laboratory 21m recirculating and tilting flume. 3-dimensional flow field was mapped over the patch. The results demonstrate the complex nature of 3-D flow patterns over root sytems on the surface of the floodplain, wich in volves localised advection of flows forcd by the root generated micro-topography.
Earth Surface Dynamics
Professor David Sear
University of Southampton University Road Southampton SO17 1BJ Location: 44/2023
Room Number: 44/2023
Telephone: (023) 8059 4614
Facsimile: (023) 8059 3295