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  • 1
    Online Resource
    Online Resource
    A landslide dating framework using a combination of Sentinel-1 SAR and -2 optical imagery
    Elsevier BV ; 2024
    In:  Engineering Geology Vol. 329 ( 2024-02), p. 107388-
    Details
    In: Engineering Geology, Elsevier BV, Vol. 329 ( 2024-02), p. 107388-
    Type of Medium: Online Resource
    ISSN: 0013-7952
    URL: Article
    DOI: 10.1016/j.enggeo.2023.107388
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2024
    detail.hit.zdb_id: 1500329-2
    SSG: 19,1
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  • 2
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    Similarities and contrasts between the subaerial and subaqueous deposits of subaerially triggered debris flows: An analogue experimental study
    Society for Sedimentary Geology ; 2020
    In:  Journal of Sedimentary Research Vol. 90, No. 9 ( 2020-09-01), p. 1128-1138
    Details
    In: Journal of Sedimentary Research, Society for Sedimentary Geology, Vol. 90, No. 9 ( 2020-09-01), p. 1128-1138
    Abstract: Debris flows and lahars are dense masses of water and sediment which are common phenomena in mountainous and volcanic regions, respectively. Where these flows debouch into water bodies they can trigger impulse waves (tsunamis) and form subaqueous deposits. Such deposits are important indicators for areas at risk from debris flows, lahars, and tsunamis and form archives of past environmental conditions. Correctly interpreting this archive, however, depends on our understanding of the sedimentology and architecture of the deposits. While subaerial debris-flow deposits have been extensively studied, there is a comparative lack of understanding of the deposits of subaerial debris flows that debouch into a water body. We experimentally investigate the similarities and contrasts between subaerial and subaqueous debris-flow deposits for flows of various magnitudes and compositions initiated in a subaerial environment. We show that flows depositing on a subaqueous plane generally have a deposit area similar to flows forming in a subaerial setting. Deposits forming on a subaqueous plane, however, are typically shorter and wider with similar thickness, as a result of interactions between the flow and the reservoir water body. Both in subaerial and subaqueous environments the deposits form coarse-grained lateral levees and frontal snout margins. However, where the levees are able to laterally confine the subaerial flows leading to deposits with constant to tapering width, the subaqueous deposits widen with distance offshore because of flow fluidization. Moreover, the frontal snout is often very dispersed, a sharp frontal margin is absent, and many isolated particles are deposited in front of the main deposit margin as a result of interactions between the debris flow and the reservoir water body. These results largely agree with observations of subaqueous pyroclastic-flow deposits. The similarity in area of subaerial and subaqueous deposits suggests that we can apply empirical relations based on subaerial flows to estimate the inundation area and flow volume of subaerial–subaqueous flows.
    Type of Medium: Online Resource
    ISSN: 1527-1404
    URL: Article
    DOI: 10.2110/jsr.2020.020
    Language: English
    Publisher: Society for Sedimentary Geology
    Publication Date: 2020
    detail.hit.zdb_id: 1340028-9
    detail.hit.zdb_id: 2047570-6
    SSG: 13
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  • 3
    Online Resource
    Online Resource
    The SWADE model for landslide dating in time series of optical satellite imagery
    Springer Science and Business Media LLC ; 2023
    In:  Landslides Vol. 20, No. 5 ( 2023-05), p. 913-932
    Details
    In: Landslides, Springer Science and Business Media LLC, Vol. 20, No. 5 ( 2023-05), p. 913-932
    Abstract: Landslides are destructive natural hazards that cause substantial loss of life and impact on natural and built environments. Landslide frequencies are important inputs for hazard assessments. However, dating landslides in remote areas is often challenging. We propose a novel landslide dating technique based on Segmented WAvelet-DEnoising and stepwise linear fitting (SWADE), using the Landsat archive (1985–2017). SWADE employs the principle that vegetation is often removed by landsliding in vegetated areas, causing a temporal decrease in normalized difference vegetation index (NDVI). The applicability of SWADE and two previously published methods for landslide dating, harmonic modelling and LandTrendr, are evaluated using 66 known landslides in the Buckinghorse River area, northeastern British Columbia, Canada. SWADE identifies sudden changes of NDVI values in the time series and this may result in one or more probable landslide occurrence dates. The most-probable date range identified by SWADE detects 52% of the landslides within a maximum error of 1 year, and 62% of the landslides within a maximum error of 2 years. Comparatively, these numbers increase to 68% and 80% when including the two most-probable landslide date ranges, respectively. Harmonic modelling detects 79% of the landslides with a maximum error of 1 year, and 82% of the landslides with a maximum error of 2 years, but requires expert judgement and a well-developed seasonal vegetation cycle in contrast to SWADE. LandTrendr, originally developed for mapping deforestation, only detects 42% of landslides within a maximum error of 2 years. SWADE provides a promising fully automatic method for landslide dating, which can contribute to constructing landslide frequency-magnitude distributions in remote areas.
    Type of Medium: Online Resource
    ISSN: 1612-510X , 1612-5118
    URL: Article
    DOI: 10.1007/s10346-022-02012-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2141883-4
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  • 4
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    Factors controlling bed and bank erosion in the Illgraben (CH)
    EDP Sciences ; 2023
    In:  E3S Web of Conferences Vol. 415 ( 2023), p. 01004-
    Details
    In: E3S Web of Conferences, EDP Sciences, Vol. 415 ( 2023), p. 01004-
    Abstract: Debris flows can grow greatly in size and hazardous potential by eroding bed and bank materials. However, erosion mechanisms are poorly understood because debris flows are complex hybrids between a fluid flow and a moving mass of colliding particles, bed erodibility varies between events, and field measurements are hard to obtain. Here, we (i) quantify the spatio-temporal patterns of erosion and deposition and (ii) identify the key controls on debris-flow erosion in the Illgraben (CH). We use a dataset that combines information on flow properties, antecedent rainfall, and bed and bank erosion for 13 debris flows that occurred between 2019 and 2021. We show that spatio-temporal patterns of erosion and deposition in natural debris-flow torrents can be highly variable and dynamic, and we identify a memory effect where erosion is strong at locations of strong deposition during previous flows and vice versa. We find that flow conditions and antecedent rainfall (affecting bed wetness) jointly control debris-flow erosion. We find statistically significant correlations between channel erosion/deposition and a wide range of flow conditions, including frontal flow depth, velocity, and discharge, and flow volume, cumulative shear stress and seismic energy, as well as antecedent rainfall. Overall, flow conditions describing the cumulative forces exerted at the bed during an event, such as cumulative shear stress and flow volume, best explain erosion. A shear-stress approach accounting for bed erodibility may therefore be applicable for modelling and predicting debris-flow erosion. This work can provide input for model development by identifying correlations of flow and bed conditions with erosion that models should oblige.
    Type of Medium: Online Resource
    ISSN: 2267-1242
    URL: Article
    DOI: 10.1051/e3sconf/202341501004
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2023
    detail.hit.zdb_id: 2755680-3
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  • 5
    Online Resource
    Online Resource
    Global documentation of overlapping lobate deposits in martian gullies
    Elsevier BV ; 2020
    In:  Icarus Vol. 352 ( 2020-12), p. 113979-
    Details
    In: Icarus, Elsevier BV, Vol. 352 ( 2020-12), p. 113979-
    Type of Medium: Online Resource
    ISSN: 0019-1035
    URL: Article
    DOI: 10.1016/j.icarus.2020.113979
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 1467991-7
    SSG: 16,12
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  • 6
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    Debris-flow dominance of alluvial fans masked by runoff reworking and weathering
    Elsevier BV ; 2014
    In:  Geomorphology Vol. 217 ( 2014-07), p. 165-181
    Details
    In: Geomorphology, Elsevier BV, Vol. 217 ( 2014-07), p. 165-181
    Type of Medium: Online Resource
    ISSN: 0169-555X
    URL: Article
    DOI: 10.1016/j.geomorph.2014.04.028
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2014
    detail.hit.zdb_id: 2001554-9
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  • 7
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    Morphologic and morphometric differences between gullies formed in different substrates on Mars: new insights into the gully formation processes
    Copernicus GmbH ; 2023
    In:  Earth Surface Dynamics Vol. 11, No. 4 ( 2023-08-02), p. 713-730
    Details
    In: Earth Surface Dynamics, Copernicus GmbH, Vol. 11, No. 4 ( 2023-08-02), p. 713-730
    Abstract: Abstract. Martian gullies are kilometer-scale, geologically young features with a source alcove, transportation channel, and depositional fan. On the walls of impact craters, these gullies typically incise into bedrock or surfaces modified by the latitude-dependent mantle (LDM; inferred as consisting of ice and admixed dust) and glaciation. To better understand the differences in the alcoves and fans of gullies formed in different substrates and infer the flow types that led to their formation, we have analyzed the morphology and morphometry of 167 gully systems in 29 craters distributed between 30 and 75∘ S. Specifically we measured length, width, gradient, area, relief, and relief ratio of the gully alcoves and fans; Melton ratio, relative concavity index, and perimeter; and form factor, elongation ratio, and circularity ratio of the gully alcoves. Our study reveals that gully alcoves formed in LDM/glacial deposits are more elongated than the gully alcoves formed in bedrock, and they possess a distinctive V-shaped cross section. We have found that the mean gradient of fans formed by gullies sourced in bedrock is steeper than the mean gradient of fans of gullies sourced in LDM/glacial deposits. These differences between gullies were found to be statistically significant and discriminant analysis has confirmed that alcove perimeter, alcove relief, and fan gradient are the most important variables for differentiating gullies according to their source substrates. The comparison between the Melton ratio, alcove length, and fan gradient of Martian and terrestrial gullies reveals that Martian gully systems were likely formed by terrestrial debris-flow-like processes. Present-day sublimation of CO2 ice on Mars may have provided the adequate flow fluidization for the formation of deposits akin to terrestrial debris-flow-like deposits.
    Type of Medium: Online Resource
    ISSN: 2196-632X
    URL: Article
    DOI: 10.5194/esurf-11-713-2023
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2023
    detail.hit.zdb_id: 2736054-4
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  • 8
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    Martian gullies and their Earth analogues: introduction
    Geological Society of London ; 2019
    In:  Geological Society, London, Special Publications Vol. 467, No. 1 ( 2019-01), p. 1-6
    Details
    In: Geological Society, London, Special Publications, Geological Society of London, Vol. 467, No. 1 ( 2019-01), p. 1-6
    Type of Medium: Online Resource
    ISSN: 0305-8719 , 2041-4927
    URL: Article
    DOI: 10.1144/SP467.15
    Language: English
    Publisher: Geological Society of London
    Publication Date: 2019
    detail.hit.zdb_id: 2478172-1
    detail.hit.zdb_id: 196249-8
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  • 9
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    Online Resource
    Martian gullies: a comprehensive review of observations, mechanisms and insights from Earth analogues
    Geological Society of London ; 2019
    In:  Geological Society, London, Special Publications Vol. 467, No. 1 ( 2019-01), p. 7-66
    Details
    In: Geological Society, London, Special Publications, Geological Society of London, Vol. 467, No. 1 ( 2019-01), p. 7-66
    Type of Medium: Online Resource
    ISSN: 0305-8719 , 2041-4927
    URL: Article
    DOI: 10.1144/SP467.14
    Language: English
    Publisher: Geological Society of London
    Publication Date: 2019
    detail.hit.zdb_id: 2478172-1
    detail.hit.zdb_id: 196249-8
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  • 10
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    Recent (Late Amazonian) enhanced backweathering rates on Mars: Paracratering evidence from gully alcoves
    American Geophysical Union (AGU) ; 2015
    In:  Journal of Geophysical Research: Planets Vol. 120, No. 12 ( 2015-12), p. 2169-2189
    Details
    In: Journal of Geophysical Research: Planets, American Geophysical Union (AGU), Vol. 120, No. 12 ( 2015-12), p. 2169-2189
    Abstract: Late Amazonian backweathering rates decrease with crater age Late Amazonian backweathering rates are an order of magnitude higher than erosion rates Enhanced backweathering rates in gullies suggest liquid water as a catalyst for weathering
    Type of Medium: Online Resource
    ISSN: 2169-9097 , 2169-9100
    URL: Issue
    URL: Article
    DOI: 10.1002/jgre.v120.12
    DOI: 10.1002/2015JE004915
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2015
    detail.hit.zdb_id: 1086497-0
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 2016810-X
    SSG: 16,13
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