26. Investigations of landslides at St Catherine's Point, Isle of Wight

Hutchinson, Jean; Bromhead, E. N.; Chandler, M. P.

doi:10.1680/ssedaa.16606.0028

Cited by 23 publications

(16 citation statements)

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“…A review of landsliding in the UK (Geomorphological Services Ltd 1987) identified The Undercliff as the largest urban area affected by landsliding in Britain, and it has been the subject of investigation for a several decades (e.g. Chandler, 1984;Hutchinson et al, 1991aHutchinson et al, , 1991bLee and Moore, 1991;Moore et al, 1995;Hutchinson and Bromhead, 2002;Moore et al, 2007aMoore et al, , 2007b. Whilst the actual date of the original Undercliff landslides remain unknown (Moore et al, 2007b) an outline of its late Quaternary history is provided in a number of previous studies (Hutchinson, 1987;Lee and Moore 1991).…”

Section: The Ventnor Landslidementioning

confidence: 99%

Patterns of movement in the Ventnor landslide complex, Isle of Wight, southern England

2014

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Abstract:The patterns of ground movement were monitored within a large, deep-seated landslide complex at Ventnor in southern England, between May 1998 and June 2002 using automated crackmeters, settlement cells and vibrating wire piezometers. It was found that the landslide maintains a state of marginal instability, such that it is subject to continual very slow deformation. Movement is primarily on a low-angled basal shear surface at >90 metres depth.The movement record shows a series of distinct deformation patterns that vary as groundwater conditions change. Continuous slow deformation occurs across the landslide complex at rates of between 5 -10 mm per year. The background pattern of movement does not appear to correlate with local porewater pressure. Periods of more rapid movement (reaching up to c. 34 mm per year during the monitoring period) were associated with a period of elevated groundwater, although the relationship between movement rate and porewater pressure was complex.The patterns of movement and the landslide geometry suggest that the likelihood of a rapid, catastrophic failure is low. Future episodes of faster movement are likely during periods when porewater pressures at the basal shear surface are elevated above a critical threshold. Whilst the resulting surface deformation damages the town, it is unlikely to occur rapidly without significant changes to the landslide hydrogeology or the stress state within the landslide. marginal instability, such that it is subject to continual very slow deformation. Movement is primarily on a low-angled basal shear surface at >90 metres depth. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems CorporationThe movement record shows a series of distinct deformation patterns that vary as groundwater conditions change. Continuous slow deformation occurs across the landslide complex at rates of between 5 -10 mm per year. The background pattern of movement does not appear to correlate with local porewater pressure. Periods of more rapid movement (reaching up to c. 34 mm per year during the monitoring period) were associated with a period of elevated groundwater, although the relationship between movement rate and porewater pressure was complex.The patterns of movement and the landslide geometry suggest that the likelihood of a rapid, catastrophic failure is low. Future episodes of faster movement are likely during periods when porewater pressures at the basal shear surface are elevated above a critical threshold. Whilst the resulting surface deformation damages the town, it is unlikely to occur rapidly without significant changes to the landslide hydrogeology or the stress state within the landslide.

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Section: The Ventnor Landslidementioning

confidence: 99%

Patterns of movement in the Ventnor landslide complex, Isle of Wight, southern England

2014

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“…A number of studies on large coastal landslides involving soils (Cotecchia, 1997(Cotecchia, , 2006Fiorillo, 2003) and rock masses (Angeli et al, 1992;Hutchinson and Bromhead, 2002;Ferrero et al, 2011) have been conducted. Alternatively, others studies have focused on entire costal sectors.…”

Section: Introductionmentioning

confidence: 99%

Detailed rock failure susceptibility mapping in steep rocky coasts by means of non-contact geostructural surveys: the case study of the Tigullio Gulf (Eastern Liguria, Northern Italy)

Vita

Cevasco

Cavallo

2012

Nat. Hazards Earth Syst. Sci.

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Abstract. In this study, an engineering geological analysis for the assessment of the rock failure susceptibility of a high, steep, rocky coast was developed by means of non-contact geostructural surveys. The methodology was applied to a 6-km coastal cliff located in the Gulf of Tigullio (Northern Tyrrhenian Sea) between Rapallo and Chiavari.The method is based on the geostructural characterisation of outcropping rock masses through meso-and macroscale stereoscopic analyses of digital photos that were taken continuously from a known distance from the coastline. The results of the method were verified through direct surveys of accessible sample areas. The rock failure susceptibility of the coastal sector was assessed by analysing the fundamental rock slope mechanisms of instability and the results were implemented into a Geographic Information System (GIS).The proposed method is useful for rock failure susceptibility assessments in high, steep, rocky coastal areas, where accessibility is limited due to cliffs or steep slopes. Moreover, the method can be applied to private properties or any other area where a complete and systematic analysis of rock mass structural features cannot be achieved.Compared to direct surveys and to other non-contact methods based on digital terrestrial photogrammetry, the proposed procedure provided good quality data of the structural features of the rock mass at a low cost. Therefore, the method could be applied to similar coastal areas with a high risk of rock failure occurrence.

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“…Hutchinson, 1991;Hutchinson et al, 1991a;Hutchinson et al, 1991b;Moore et al, 2007;Winfield et al, 2007;Moore et al, 2010) have significantly improved the understanding of the nature and mechanisms of these landslides. However, there is much less discussion of significant failures elsewhere.…”

Section: Introductionmentioning

confidence: 99%

“…The area has been the subject of two large conferences to demonstrate best practice in dealing with landslide problems Jakeways, 2002, McInnes et al, 2007). There is a large volume of documentation relating to the area (Hutchinson, 1991, Hutchinson et al, 1991a, Hutchinson et al, 1991b, Moore et al, 2007and Moore et al, 2010 and so the area is not discussed in detail here. However the area is geologically similar to the Luccombe area discussed below.…”

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confidence: 99%

Geology as a control on landslides on the Isle of Wight: an overview

Jenkins

Foster

Hopson

2011

Proceedings of the Geologists' Association

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The Cretaceous and Palaeogene sedimentary rocks that crop out on the Isle of Wight are highly prone to landsliding and the island offers an important field laboratory wherein to investigate a number of the different types of failure. Many of these landslides represent a significant engineering hazard, with several urban areas requiring remedial work and planning constraints (e.g. The Undercliff and Seagrove Bay) to aid development. Previous studies have thoroughly investigated the major landslides in the Undercliff area around Ventnor and presented a mechanism for that massive failure. This overview of the landslides throughout the Isle of Wight by the British Geological Survey was completed as part of the multidisciplinary survey of the surface geology, structure, geophysical response and offshore interpretations of the island between 2007 and 2010. The survey has collected new observational data on the extensive coastal landslides, as well as the distribution, nature and mechanism of failure of the lesser-studied inland examples.Keywords: Landslides, Isle of Wight, Cretaceous, Palaeogene, coastal erosion. IntroductionThe Cretaceous and Palaeogene strata of the Isle of Wight are mainly composed of relatively soft, often poorly lithified sedimentary rocks, the nature of which makes them highly susceptible to landsliding. These susceptible units are interbedded with more competent layers that affect the style of the failure by providing a natural 'reinforcement' of the stratal units during failure. Slope instability is exacerbated at the coast where marine erosion unloads the toes of cliffs leading to cliff failure and sequential failure within existing landslides. Extensive landslides occuring inland, for example on the slopes of the southern chalk downs, are the result of a complex interrelationship between the strata, geomorphological development, palaeoclimate and climate, and groundwater. Here the removal of toe debris is slow and sporadic and the slides have a natural angle of stability. Together, these areas present a significant hazard to infrastructure on the island.The studies of landslides affecting the Undercliff in Ventnor, Luccombe, and Seagrove Bay (e.g. Hutchinson, 1991;Hutchinson et al., 1991a;Hutchinson et al., 1991b;Moore et al., 2007;Winfield et al., 2007;Moore et al., 2010) have significantly improved the understanding of the nature and mechanisms of these landslides. However, there is much less discussion of significant failures elsewhere. Thus the purpose of the interdisciplinary survey of the island described in this paper has been to provide an overview of all other major failures. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 The existing British Geological Survey (BGS) 1:50 000 geological map of the Isle of Wight (British Geological Survey, 1976) shows extensive landslides arou...

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26. Investigations of landslides at St Catherine's Point, Isle of Wight

Cited by 23 publications

References 0 publications

Patterns of movement in the Ventnor landslide complex, Isle of Wight, southern England

Patterns of movement in the Ventnor landslide complex, Isle of Wight, southern England

Detailed rock failure susceptibility mapping in steep rocky coasts by means of non-contact geostructural surveys: the case study of the Tigullio Gulf (Eastern Liguria, Northern Italy)

Geology as a control on landslides on the Isle of Wight: an overview

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