Baseline data for monitoring geomorphological effects of glacier lake outburst flood: a very-high-resolution image and GIS datasets of the distal part of the Zackenberg River, northeast Greenland

Ewertowski, Marek

doi:10.5194/essd-13-5293-2021

Cited by 8 publications

(5 citation statements)

References 67 publications

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“…The most common issues associated with SfM reconstruction are related to water surfaces, which are particularly important in rapidly changing glacier forelands prone to high levels of de‐icing and concomitant pond and lake development, growth and decay. For example, SfM can reconstruct points located underwater in shallow, transparent ponds (Carrivick & Smith, 2019); however, the algorithm struggles in cases with high water turbidity or suspended sediments (see Tomczyk & Ewertowski, 2021). In our case studies, this was clearly the case in relation to the large proglacial/supraglacial lake, which was characterized by high suspended sediment concentrations combined with small wind‐generated ripples, resulting in the erroneous reconstruction of the water surface.…”

Section: Discussionmentioning

confidence: 99%

Quantification of short‐term transformations of proglacial landforms in a temperate, debris‐charged glacial landsystem, Kvíárjökull, Iceland

Śledź,

Ewertowski,

Evans

2023

Land Degrad Dev

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Proglacial areas are dynamic landscapes and important indicators of geomorphic changes related to climate warming. Systematic and repeat surveys of landforms presently evolving on glacier forelands facilitate the quantification of rates of change and an improved understanding of the processes generating those changes. We report short‐term (2014–2022) transformations of the proglacial landscape in front of Kvíárjökull, SE Iceland, and place them in a longer‐term context of glacial landsystem evolution using aerial image archives since 1945. Short‐term quantification uses a time series of uncrewed aerial vehicle (UAV) surveys, processed utilizing a structure‐from‐motion (SfM) workflow, to produce digital elevation models (DEMs) and orthophoto mosaics. The land elements surveyed include a kame terrace staircase, an outwash plain, an ice‐cored hummocky moraine complex and ice‐cored hummocky terrain with discontinuous sinuous ridges, for which elevation and volumetric changes are quantified. The kame terraces between 2014 and 2022 and the outwash plain between 2016 and 2022 were mainly stable with, respectively, 87% and 85% of their surfaces showing no change. The ice‐cored hummocky terrain with discontinuous sinuous ridges underwent a volume loss of 64,632 m3 in 2016–2022, with a maximum surface lowering of ≤9 m. The most dynamic land element was the ice‐cored hummocky moraine complex, with transformations recorded for more than 87% of its area in 2014–2022; the surface was lowered by ≤23 m in some places, with a total volume loss of 365,773 m3. Our results confirm the ongoing degradation of ice‐cored moraine and outwash complexes at variable rates related to buried ice volume and age of deglaciation. The evolution of chaotic hummocky terrain from debris‐covered glacier ice, glacitectonic thrust masses, outwash fans/heads and complex englacial esker networks is an important modern analogue for informing palaeoglaciological reconstructions.

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Section: Discussionmentioning

confidence: 99%

Quantification of short‐term transformations of proglacial landforms in a temperate, debris‐charged glacial landsystem, Kvíárjökull, Iceland

Śledź,

Ewertowski,

Evans

2023

Land Degrad Dev

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“…Structure-from-Motion Multi View Stereo Photogrammetry (SfM MVS Photogrammetry) is applicable for soil erosion, volcanology, glaciology, coastal morphology, mass movements, and fluvial morphology. It was used in at least 65 scientific studies from 2012 to 2015 (Eltner et al, 2016) and also recently (Grottoli et al, 2020;Tomczyk and Ewertowski, 2021). The advantages of SfM MVS Photogrammetry are that it can be applied fully automated (Eltner et al, 2016), is flexible, inexpensive, and requires little training (Westoby et al, 2012).…”

Section: Structure-from-motion Multi View Stereo Photogrammetrymentioning

confidence: 99%

High-resolution digital elevation models and orthomosaics generated from historical aerial photographs (since the 1960s) of the Bale Mountains in Ethiopia

Muhammed

Hailu

Miehe

et al. 2023

Preprint

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Abstract. The natural resources of Ethiopian high-altitude ecosystems are commonly perceived as increasingly threatened by devastating land-use practices owing to decreasing lowland resources. Quantified time-series data of the course of land-use cover changes are still needed. Very high-resolution digital data on the historical landscape over the recent decades are needed for determining the impacts of changes in afro-alpine ecosystems. However, digital elevation models (DEMs) and orthomosaics do not exist for most afro-alpine ecosystems of Africa. We processed the only available and oldest historical aerial photographs for Ethiopia and, to the best of our knowledge, for any afro-alpine ecosystem. Here, we provide both DEM and orthomosaic images for the years 1967 and 1984 for the Bale Mountains in Ethiopia, which comprise the largest afro-alpine ecosystem in Africa. We used 298 historical aerial photographs captured in 1967 and 1984 for generating DEMs and orthomosaics with Structure from Motion Multi View Stereo Photogrammetry along an elevation gradient from 977 to 4377 m above sea level (asl) at spatial resolutions of 0.84 m and 0.98 m for the years 1967 and 1984, respectively. Our datasets can be used by researchers and policymakers for (1) watershed management, as the area provides water for more than 30 million people; (2) landscape management; (3) detailed mapping and analysis of geological and archaeological features, as well as natural resources; (4) analyses of geomorphological processes; and (5) biodiversity research.

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“…However, when a large volume of water is held in a glacial lake by an unstable dam, it increases the probability of a GLOF (Benn et al, 2012). GLOFs are one of the most catastrophic extreme events in glaciated mountain regions (Tomczyk and Ewertowski, 2021;Taylor et al, 2023). They occur when water is suddenly released from a glacial lake due to a dam breach (Anacona, Mackintosh, and Norton, 2015;Emmer et al, 2022).…”

Section: Glacial Lake Outburst Floodingmentioning

confidence: 99%

UAS remote sensing applications to abrupt cold region hazards

Verfaillie,

Cho,

Dwyre

et al. 2023

Front. Remote Sens.

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Unoccupied aerial systems (UAS) are an established technique for collecting data on cold region phenomenon at high spatial and temporal resolutions. While many studies have focused on remote sensing applications for monitoring long term changes in cold regions, the role of UAS for detection, monitoring, and response to rapid changes and direct exposures resulting from abrupt hazards in cold regions is in its early days. This review discusses recent applications of UAS remote sensing platforms and sensors, with a focus on observation techniques rather than post-processing approaches, for abrupt, cold region hazards including permafrost collapse and event-based thaw, flooding, snow avalanches, winter storms, erosion, and ice jams. The pilot efforts highlighted in this review demonstrate the potential capacity for UAS remote sensing to complement existing data acquisition techniques for cold region hazards. In many cases, UASs were used alongside other remote sensing techniques (e.g., satellite, airborne, terrestrial) and in situ sampling to supplement existing data or to collect additional types of data not included in existing datasets (e.g., thermal, meteorological). While the majority of UAS applications involved creation of digital elevation models or digital surface models using Structure-from-Motion (SfM) photogrammetry, this review describes other applications of UAS observations that help to assess risks, identify impacts, and enhance decision making. As the frequency and intensity of abrupt cold region hazards changes, it will become increasingly important to document and understand these changes to support scientific advances and hazard management. The decreasing cost and increasing accessibility of UAS technologies will create more opportunities to leverage these techniques to address current research gaps. Overcoming challenges related to implementation of new technologies, modifying operational restrictions, bridging gaps between data types and resolutions, and creating data tailored to risk communication and damage assessments will increase the potential for UAS applications to improve the understanding of risks and to reduce those risks associated with abrupt cold region hazards. In the future, cold region applications can benefit from the advances made by these early adopters who have identified exciting new avenues for advancing hazard research via innovative use of both emerging and existing sensors.

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Baseline data for monitoring geomorphological effects of glacier lake outburst flood: a very-high-resolution image and GIS datasets of the distal part of the Zackenberg River, northeast Greenland

Cited by 8 publications

References 67 publications

Quantification of short‐term transformations of proglacial landforms in a temperate, debris‐charged glacial landsystem, Kvíárjökull, Iceland

Quantification of short‐term transformations of proglacial landforms in a temperate, debris‐charged glacial landsystem, Kvíárjökull, Iceland

High-resolution digital elevation models and orthomosaics generated from historical aerial photographs (since the 1960s) of the Bale Mountains in Ethiopia

UAS remote sensing applications to abrupt cold region hazards

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