Manchester Geographical Society

North West Geography


Volume 15, Number 1, 2015

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Sefton Coast's vulnerability to coastal flooding using DEM data

A preliminary analysis of the vulnerability of the Sefton coast to coastal flooding was carried out using a high-resolution DEM and census data from 2011. Results indicate that up to 12,500 people live within areas below the significant dune erosion level. Low-lying areas are clustered in two main locations, the South Formby / Hightown and Southport. High dunes from 15 to 35 m high are common in the central part of the Sefton Coast, including Formby Point and Ainsdale. This highlights the significance of the Sefton dune field system as a potential defence mechanism against coastal erosion and flooding, and the need to consider management schemes that would allow the dunes to adapt to sea level rise and climate change.

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Analysis of 'hummocky moraine' using Structure-from-Motion photogrammetry

This study presents results of a high-resolution topographic survey of the proglacial area of Austre Lovénbreen, Svalbard. Structure-from-Motion (SfM) was used to generate a digital elevation model (DEM) of the proglacial zone from aerial imagery. This DEM is used to explore the topography of a zone of hummocky moraine within the glacier 's Neoglacial limit. The origin of hummocky moraine has proven controversial, but detailed morphological studies can contribute to a better understanding of how these features form, and the extent to which they may be preserved in the palaeo-glaciological record, including within northwest Britain. In cross-profile, hummocky moraine is characterised by a sequence of asymmetrical ridges, with longer, low angle up-glacier faces, and shorter, steeper down-glacier faces. This profile is interpreted to represent a sequence of ridges stacked-up against a bedrock riegel and reverse bedslope. Whilst the origin of these features is uncertain, the enhanced compression associated with glacier flow against a bedrock riegel, possibly during a glacier surge, may have been sufficient to have generated debris-rich englacial thrusts that subsequently melted-out to form the observed hummocky moraine. The significance of this research highlights ongoing studies aimed at understanding the origin and palaeo-glaciological significance of hummocky moraine in northwest Britain.

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