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  • 1
    Electronic Resource
    Electronic Resource
    The application of finite element analysis to the solution of Stokes wave diffraction problems (1991)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 12 (1991), S. 343-367 
    Details
    ISSN: 0271-2091
    Keywords: Stokes waves ; Non-linear waves ; Second order waves ; Wave diffraction ; Finite elements ; Wave loading ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A new finite-element based method of calculating non-linear wave loads on offshore structures in extreme seas is presented in this paper. The diffraction wave field is modelled using Stokes wave theory developed to second order. Wave loads and free surface elevations are obtained for fixed surface-piercing structures by solving a boundary value problem for the second-order velocity potential. Special attention has been given to the radiation condition for the second-order diffraction field. Results are presented for three test examples, the vertical cylinders of Kim and Yue and of Chakrabarti, and an elliptic cylinder. These results demonstrate that early problems with the application of second-order theory arising from inadequate radiation conditions have been overcome.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650120404
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Assessing the potential for future first-time slope failures to impact the oil and gas pipeline corridor through the Makarov Mountains, Sakhalin Island, Russia (2012)
    Geological Society of London
    Details
    Publication Date: 2012-02-01
    Description: The Sakhalin Energy Investment Company Ltd (SEIC) Sakhalin II Phase 2 oil and gas pipeline corridor is 782 km in length, and extends from landfall sites in the north of the island to a liquefied natural gas plant and oil export terminal in the south. For c. 120 km this alignment crosses the Makarov Mountains, an approximately north–south-orientated grouping of ridges and valleys formed in Cretaceous mudstones, Tertiary siltstones, sandstones, coal measures, lavas and tuffs. Situated on the NW Pacific rim, the island is prone to seismic activity, and the design and construction of the pipelines’ alignment has had to take into consideration a number of existing landslides (more than 400 in total). Additionally, the continuing seismic hazard, combined with slope toe erosion by rivers and high groundwater tables brought about by spring snow melt and summer rains, creates a potential for first-time landslides to occur during the 50 year operational period of the pipelines. To assess where such failures might take place a study was undertaken that combined back-analysis and sensitivity analysis, landslide susceptibility analysis (including factor analysis) and qualitative evaluation. The qualitative evaluation allowed a judgement-based assessment to be included in the identification and prioritization of potential future first-time failure areas. Ground truthing was then undertaken in the areas of highest susceptibility, and generally supported the findings of the analysis. In c. 50% of these cases the potential for landslide initiation was considered to be sufficiently high to warrant intervention, in terms of ground investigation, slope movement and groundwater monitoring, or engineering mitigation. The study highlights the uncertainties that exist when undertaking exercises such as these where geotechnical information is insufficient to carry out rigorous modelling and where broad geological and geographical assessments have to be made in order to yield the required outputs.
    Print ISSN: 1470-9236
    Topics: Geosciences
    Published by Geological Society of London
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  • 3
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    Settlements and slides: a large landslide case study from the Central Cordillera of the Philippines (2019)
    Geological Society of London
    Details
    Publication Date: 2019
    Description: 〈span〉〈div〉Abstract〈/div〉The Central Cordillera of Luzon in the Philippines is home to some of the most complex geology, active plate margin tectonism, heaviest rainfall and steepest terrain in the world. It also hosts a thriving agricultural community that has developed its agrarian, municipal and transport infrastructure in a landscape of marginal stability and extreme geomorphological sensitivity. The village of Pilando occupies a saddle on a prominent ridge where it is crossed by the Halsema Highway. Due to landslide displacements, both the highway and the village have been subsiding for several decades and many dwellings have had to be abandoned. From topographical survey and visual observation, average rates of settlement vary between approximately 0.1 and 0.4 myr〈sup〉−1〈/sup〉. The apparent depth and areal extent of ground movement are such that attempts to stabilise the area would be both impracticable and uneconomic. Realignment and relocation are options that might be considered but many adjacent slopes are unstable or have failed in the past and those that haven't are highly sensitive to earthworks and drainage disturbance. Unfortunately, there are many areas of the Central Cordillera that suffer from similar slope instability problems. The interpretation of satellite imagery available on Google Earth, supported by geomorphological field observation, can assist in the delineation and assessment of these notably unstable areas for land use planning and slope management purposes.〈/span〉
    Print ISSN: 1470-9236
    Electronic ISSN: 2041-4803
    Topics: Geosciences
    Published by Geological Society of London
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  • 4
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    Proving a landslide: ground behaviour problems at Pissouri, Cyprus (2018)
    Geological Society of London
    Details
    Publication Date: 2018
    Description: 〈span〉〈div〉Abstract〈/div〉The residential area of Limnes in Pissouri, SW Cyprus has experienced significant ground behaviour problems since heavy winter rainfall in 2011/2012. These problems have comprised cracking and displacement to the ground, pavements, roads, walls and buildings, leading to the abandonment of the most seriously-affected houses. Nicosia marl comprises the underlying lithology, a material that is associated with volume change upon wetting and drying and has led to foundation problems elsewhere in the country. Various explanations have been given to account for the observed phenomena at Limnes, including the effects of 〈span〉underground water〈/span〉, settlement, slope instability, cyclical shrink–swell, seepage erosion and dissolution. Raised water tables, caused by residential waste-water discharges, applied loads from residential buildings, and inadequate ground investigation and foundation design, are other contributory or causal factors that have been cited. A geomorphological study was undertaken in 2017 and early 2018 that combined field observations with aerial photograph interpretation, and a review of available ground investigation data, to yield an explanation and develop a preliminary ground model. The conclusion drawn was that the Limnes area had been affected by ancient (possibly late Pleistocene–early Holocene) deep-seated failure and that slope instability had subsequently been reactivated at a shallower depth within the failed material as a result of loss of material strength and high water tables. The properties of the Nicosia marl, while important in controlling the behaviour of the ground on a site-by-site basis, were considered to be aggravating factors in the context of the landslide displacement(s) affecting the slope as a whole. InSAR satellite movement monitoring data were analysed for the Limnes area and the outcome vindicated the geomorphological interpretation and helped strengthen the ground model that embodied slope failure as the underlying cause of damage.〈/span〉
    Print ISSN: 1470-9236
    Electronic ISSN: 2041-4803
    Topics: Geosciences
    Published by Geological Society of London
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  • 5
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    Book review (2018)
    Geological Society of London
    Details
    Publication Date: 2018
    Description: 〈span〉〈strong〉Engineering Geology and Geomorphology of Glaciated and Periglaciated Terrains, Engineering Group Working Party Report〈/strong〉, Edited by Griffiths, J.S. and Martin, C.J., 953pp, 2017, ISBN: 9781786203021 Engineering Geology Special Publication No 28, Geological Society, London, hardback, £120.00 list price, £60.00 Fellow's price.〈/span〉
    Print ISSN: 1470-9236
    Electronic ISSN: 2041-4803
    Topics: Geosciences
    Published by Geological Society of London
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  • 6
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    Book review (2018)
    Geological Society of London
    Details
    Publication Date: 2018
    Description: 〈span〉〈strong〉Engineering of Glacial Deposits〈/strong〉, Barry G. Clarke, CRC Press, Boca Raton, FL, 2017, £120, hardback, 504 pp., ISBN: 9780415398657〈/span〉
    Print ISSN: 1470-9236
    Electronic ISSN: 2041-4803
    Topics: Geosciences
    Published by Geological Society of London
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  • 7
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    Slope Engineering for Mountain Roads (2013)
    Association of Engineering Geologists (AEG)
    Details
    Publication Date: 2013-05-17
    Print ISSN: 1078-7275
    Topics: Geosciences
    Published by Association of Engineering Geologists (AEG)
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  • 8
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    Engineering geomorphology of the Koshi Highway, east Nepal (2017)
    Geological Society of London
    Details
    Publication Date: 2017-08-12
    Description: The design and construction of the 240 km Koshi Highway in east Nepal between Dharan on the Terai Plain and Num in the Middle Himalaya commenced in the early 1970s and was completed in 2012 when the first vehicles were able to drive to Num. In a region where difficult terrain and geohazards pose severe challenges to highway engineering, geomorphological assessments have played an important and successful role in assisting route selection, detailed design of alignments, and the management of earthworks and drainage. These geomorphological assessments have also included the monitoring of slopes and watercourses to quantify geomorphological processes and assess the impact that road construction and operation have had on them. From an engineering geomorphological perspective, the Koshi Highway has proved a success and it demonstrates how careful design and control of construction operations can help limit physical impacts on the terrain, even in the most unstable parts of the landscape.
    Print ISSN: 1470-9236
    Topics: Geosciences
    Published by Geological Society of London
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  • 9
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    Terrain geohazards and sustainable engineering in Ladakh, India (2017)
    Geological Society of London
    Details
    Publication Date: 2017-08-12
    Description: The high-altitude desert landscape of Ladakh poses a number of obstacles and challenges to sustainable engineering, the development of natural resources, livelihood improvement and the protection of communities and infrastructure from natural hazards. Severe terrain, extremes of climate, floods, landslides and erosion are major factors to contend with and lessons can be learnt from the history of engineering management in the region. Geological and geohazard studies must be integral components of future development plans, combining remote sensing with field investigations. Engagement with local communities will provide valuable historical context concerning the behaviour of the landscape and will help define the land management approaches best suited to engineering intervention.
    Print ISSN: 1470-9236
    Topics: Geosciences
    Published by Geological Society of London
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  • 10
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    Discussion on 'Landslide risk assessment: the challenge of communicating uncertainty to decision-makers Quarterly Journal of Engineering Geology and Hydrogeology, Vol. 49, 2016, pp. 21 - 35 (2016)
    Geological Society of London
    Details
    Publication Date: 2016-09-10
    Description: This paper (Lee 2016) is a very welcome contribution to the discussion on risk and uncertainty with respect to potential landslide impacts and the manner in which this is conveyed to decision-makers. The paper is extremely well-researched and the fact that the author is an authority on the subject makes the paper all the more important.
    Print ISSN: 1470-9236
    Topics: Geosciences
    Published by Geological Society of London
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