Coastal Chalk Cliff Instability (Geological Society by R. N. Mortimore, A. Duperret PDF

By R. N. Mortimore, A. Duperret

Lots of the rocky coastlines world wide are topic to lively erosion strategies. end result of the transforming into risk to neighborhood groups from coastal cliff retreat, it's important to enquire the place, while and the way cliffs cave in. the result of those reports are important for the planners and native experts answerable for safeguard and entry to cliffs and shores. This quantity specializes in the coastal chalk cliffs of the English Channel, the place a multidisciplinary strategy has been used to appreciate lively coastal cliff recession. The booklet is geared up round 3 major issues: the geological elements controlling cliff instability, the marine parameters influencing coastal erosion and using a few new instruments for chance checks. This ebook might be of use to lecturers and execs engaged on rocky seashores, with an curiosity in sedimentary geology, stratigraphy, tectonics, geomorphology, engineering geology, coastal engineering and GIS. additionally on hand: construction Stone Decay: From prognosis to Conservation - designated book no 271 - ISBN 1862392188 Mapping in Engineering Geology (Key matters in Earth Sciences) - ISBN 1862391017 The Geological Society of LondonFounded in 1807, the Geological Society of London is the oldest geological society on the planet, and one of many greatest publishers within the Earth sciences.The Society publishes a variety of top quality peer-reviewed titles for lecturers and pros operating within the geosciences, and enjoys an enviable overseas attractiveness for the standard of its work.The many parts during which we post in include:-Petroleum geology-Tectonics, structural geology and geodynamics-Stratigraphy, sedimentology and paleontology-Volcanology, magmatic reports and geochemistry-Remote sensing-History of geology-Regional geology courses

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Extra info for Coastal Chalk Cliff Instability (Geological Society Engineering Geology Special Publication No. 20)

Example text

The undercliff walk beneath these Marina sections is designed to provide access to the cliffs for the public and students. Many reports have been written on the cliff stability (see ROCC database). Each sedimentary component of the geology has its own geotechnical properties. The Chalk wave-cut platform underneath the raised beach is solid, relatively unweathered CIRIA GRADE B/C 2/3 chalk. The degree of fracturing will affect the ability of this unit to drain freely. 8m aod (Shephard-Thorn & Wymer 1977, p.

However, on the Sussex coast these are primarily confined to Chalk formations close to the feather edge of overlying Palaeogene deposits at Seaford Head, Newhaven and at Portobello, Telscombe Cliffs. At Seaford Head a combination of a southerly dip of strata and the presence of the Jevington Fault brings Lewes Nodular Chalk Formation into the cliffs on the west side of Cuckmere Haven (Fig. 2). Dissolution pipes become progressively better developed (Fig. 16) and more influential on cliff stability along the crest-line of the cliff from east (Hope Gap) to west (the Castrum).

The Glauconitic Marl Member at the base of the Chalk Group also forms reefs which incorporate the basal beds of the West Melbury Marly Chalk Formation. These low cliffs and the associated landslips provide unique exposures in beds that are poorly exposed anywhere else in Sussex. Observations indicate that the West Melbury Marly Chalk Formation, which predominates in this section of cliff, tends to fail in irregular masses rather than being fracture controlled. Towards Head Ledge, the stronger beds of the Upper Greensand and Glauconitic Marl allow more vertical, low cliffs to develop.

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