Objective Research objectives and content Main aim is to understand the physical principles that govern the dispersal of tephra during eruptions and to produce the first general models of disper- -sal in wind-blown volcanic plumes. The approach will be to develop fluid-dy- -namically based parameterisations of the time averaged velocity field in the plumes as it gains horizontal momentum from the wind.The models will be tested against laboratory data on sedimentation from plumes in a cross- current and from field studies, including tephra deposits from volcanoes in Ecuador and from the 19951996 explosive eruptions of Ruapehu Yolcano (New Zealand). Some complexities will be investigated including: effects of Reynolds number of particle setting and tephra layer thinning; aggregation of fine particles; various kinds of atmospheric motions from small-scale turbulence to large-scale rotational flows; possibility of convective insta- bilities at the base of wind-advected plumes. The models will be developed into a software package that can be used in volcano observatories and by civil authorities to mitigate the effects of volcanic ash. Training content (objective, benefit and expected impact) Training will be provided in the fluid dynamics, volcanology, computer model ling and experimental research, using the laboratory facilities at Bristol. Links with industry / industrial relevance (22) The principles that govern dispersal of particles by naturalplumes must also apply to industrial plumes. Fields of science natural sciencesearth and related environmental sciencesgeologysedimentologynatural sciencescomputer and information sciencessoftwarenatural sciencesearth and related environmental sciencesgeologyvolcanologynatural sciencesphysical sciencesclassical mechanicsfluid mechanicsfluid dynamics Programme(s) FP4-TMR - Specific research and technological development programme in the field of the training and mobility of researchers, 1994-1998 Topic(s) 0302 - Post-doctoral research training grants TE12 - Volcanology Call for proposal Data not available Funding Scheme RGI - Research grants (individual fellowships) Coordinator University of Bristol Address Queens' road BS8 1RJ Bristol United Kingdom See on map EU contribution € 0,00 Participants (1) Sort alphabetically Sort by EU Contribution Expand all Collapse all Not available Italy EU contribution € 0,00 Address See on map