Papers by Stephan Harrison
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Irish Geography
Paraglacial processes represent the dominant mechanism of geomorphic change in deglaciating lands... more Paraglacial processes represent the dominant mechanism of geomorphic change in deglaciating landscapes worldwide and are now being increasingly recognised as controls on deglacial and postglacial landscape dynamics. This reflects the influence of glacigenic lithospheric loading/unloading cycles and patterns of glacigenic erosion and deposition. Ireland is an important location for studying the impacts of paraglacial processes in the landscape, as it was strongly imprinted by the erosional and depositional imprints of late Pleistocene glaciations and was affected by rapid shifts in North Atlantic climate. Using examples from mountains, rivers and coasts from across Ireland, this study examines some of the varied landscape responses to paraglacial relaxation in these different settings. The purpose behind this study is to show how the styles of paraglacial response may vary over time and space, even within a single regional landscape, and this can help assess the sensitivity of differ...
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Elsevier eBooks, 2020
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Global Ecology and Conservation, Jul 1, 2015
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Frontiers in Water
The Himalaya plays a vital role in regulating the freshwater availability for nearly a billion pe... more The Himalaya plays a vital role in regulating the freshwater availability for nearly a billion people living in the Indus, Ganga, and Brahmaputra River basins. Due to climate change and constantly evolving human-hydrosphere interactions, including land use/cover changes, groundwater extraction, reservoir or dam construction, water availability has undergone significant change, and is expected to change further in the future. Therefore, understanding the spatiotemporal evolution of the hydrological cycle over the Himalaya and its river basins has been one of the most critical exercises toward ensuring regional water security. However, due to the lack of extensivein-situmeasurements, complex hydro-climatic environment, and limited collaborative efforts, large gaps in our understanding exist. Moreover, there are several significant issues with available studies, such as lack of consistent hydro-meteorological datasets, very few attempts at integrating different data types, limited spat...
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Frontiers in Earth Science
Glacierized mountain ranges such as the Himalaya comprise a variety of glacier types, including c... more Glacierized mountain ranges such as the Himalaya comprise a variety of glacier types, including clean and debris-covered glaciers. Monitoring their behaviour over time requires an assessment of changes in area and elevation along with surface features and geomorphology. In this paper we quantify the surface evolution of glacier systems in the Manaslu region of Nepal over the last five decades using 2013/2019 multi-sensor imagery and elevation data constructed from 1970 declassified Corona imagery and 1970 declassified Corona imagery. We investigate area changes, glacier thickness, geodetic glacier mass balance and surface velocity changes at regional scales and focus on the Ponkar Glacier and Thulagi Glacier and Lake for an in-depth assessment of surface geomorphology and surface feature dynamics (ponds, vegetation and ice cliffs). The time series of surface elevation changes for the lower ablation area of Ponkar Glacier is extended using 2019 UAV-based imagery and field-based ablat...
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Routledge, Dec 5, 2016
This paper explores the utility of aerial photographs for investigating landscapes of WWII confli... more This paper explores the utility of aerial photographs for investigating landscapes of WWII conflict associated with the Normandy Campaign and the bombing of German military sites in northwest France during 1943 and 1944, and also the lesser known history of landscape rehabilitation and remediation in the immediate post-war recovery period. The primary resource used here are vertical aerial photographs at scales between c.1:1,500 and 1:26,000, taken between 1945 and 1960 and accessible from the online archive hosted by the Institut Géographique National (IGN). Our analysis focuses on rural areas impacted by one or more Allied air raids, either because they witnessed major Allied ground offensives or were the sites of German military installations. Areas of open agricultural land have rarely preserved any visible evidence of bomb damage, but here the photographic record enables analysis of the intensity and character of bombing and the immediate post-war remediation of farmland. Allied air raids also targeted supply depots and V-weapon facilities concealed in regional forests, and here it is demonstrated that forest clearance associated with fires and late- and post-war munitions disposal activities have combined to render formerly camouflaged military sites, bomb craters and remediation landscapes as readily visible on aerial images. Keywords: aerial photographs, WWII, northwest France, bomb craters, remediation
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Global and Planetary Change, 2022
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All data used in the PATICE database is available in the Supplementary Information, which compris... more All data used in the PATICE database is available in the Supplementary Information, which comprise: • Full Excel tables of recalibrated published ages (including all data required to rerun the calculations). • ESRI Shapefiles of each dating technique and compiled geomorphology. • ESRI Shapefiles of outlines of ice extent and uncertainty in the ice margin. • ESRI Shapefile of ice flow and ice divide at the LLGM. • ESRI Shapefile of names of outlet lobes.
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Global and Planetary Change, 2021
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<p&amp... more <p>One consequence of current and likely future melting of high mountain glaciers is the development of glacial lakes. Their evolution over time has implications for future water supplies in arid mountains and for the timing and magnitude of glacier hazards, such as Glacial Lake Outburst Floods (GLOFs).</p><p>GLOF initiation depends on how lakes are connected to the glacial system, resulting from myriad processes such as the destabilisation of moraine dams and glacier front calving. To better understand these processes, we have undertaken an inventory of all glacier lakes in the Cordillera Blanca of Peru for 2019. We used manual digitisation from Landsat RGB at 30m resolution and have recorded the type of lake dam and its connection with surrounding glaciers and mountain slopes. We have also obtained lake inventories from INIAGEM (Instituto Nacional de Investigación en Glaciares y Ecosistemas de Montaña; 2016) and ANA (Autoridad Nacional del Agua; 2018), and have created an automatic inventory using the Normalised Difference Water Index and Normalised Difference Snow Index in Google Earth Engine. In this presentation we compare these different inventories and discuss both the methods and effectiveness of each for understanding GLOF hazards in the Peruvian Andes. </p>
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Global and Planetary Change, 2018
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Climatic Change, 2016
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Papers by Stephan Harrison