Identifying the impact of the winter 2013/14 storms and subsequent remediation work on the sediment at Chesil Beach Dr David Graham Department of Geography.

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Presentation transcript:

Identifying the impact of the winter 2013/14 storms and subsequent remediation work on the sediment at Chesil Beach Dr David Graham Department of Geography Loughborough University

Context of Chesil Beach BMU 3 BMU 1& 2 Cove Inn UNESCO SAC SPA SSSI Geomorphology Particle size and composition

January / February 2014 storms

Why is grain size important? SSSI citation ‘Closed system’ – only ‘18 billion’ pebbles left! Uncertainty remains over causes of size grading Control on flood risk Wave energy/run up Percolation and overtopping

Digital Gravelometer Commercial software package developed at Loughborough Photographic sampling + digital image analysis Originally developed for river sediments Used internationally Key benefits: Very rapid  facilitates high-resolution sampling  cost effective Non-destructive

27 profiles 189 samples c images Consistent locations

27 'Wolman' samples for control

Results: magnitude of errors Image processing procedures not optimised for beach sediments (well sorted) Calibrated using 'Wolman' data Small errors after calibration (c. 5%)

Results: along-beach trends

Results: across-beach trends

Results: summary diagram

Key finding: “Limited evidence” of impact Long shore:  No obvious discontinuity at management boundary  Some evidence of difference in ‘shape’ of grain size distribution but magnitude very small Cross shore:  Most variation in managed unit BUT this was small and within most dynamic section of the beach Project generated benchmark dataset for future monitoring

The report is available in the Loughborough University Institutional Repository: The data are available in the Loughborough University Data Repository: l DOI: /rd.lboro