Post-seismic monitoring of cliff mass wasting using an unmanned aerial vehicle and field data at Egremni, Lefkada Island, Greece

Koukouvelas, Ioannis; Nikolakopoulos, Konstantinos G.; Zygouri, Vasiliki; Kyriou, Aggeliki

doi:10.1016/j.geomorph.2020.107306

Cited by 30 publications

(30 citation statements)

References 47 publications

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“…During the fieldwork, we focused on areas characterized by significant clustering of secondary effects, like liquefaction phenomena and/or ground failures, where accurate mapping by UAV photogrammetric flights was performed (Figure 2). Our flights followed the methodology developed by [28][29][30]. Our field surveys started on the morning of the 4th of March 2021 and lasted for almost three weeks.…”

Section: Mapping Of Fault Array and Documentation Of Ground Failuresmentioning

confidence: 99%

The March 2021 Damasi Earthquake Sequence, Central Greece: Reactivation Evidence across the Westward Propagating Tyrnavos Graben

et al. 2021

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On 3 March 2021, a strong shallow earthquake affected northern Thessaly, Greece, with an epicenter close to Damasi village causing significant destruction of many stone houses. In this contribution, we provide fieldwork observations, satellite radar interferometry, mapping of the active faults exposed in the epicentral area, liquefactions and coseismic surface ruptures, and preliminary geomorphological analyses of the epicentral area. The geomorphological analysis is based on air photographs, digital surface models analysis, Real-Time Kinematik (RTK) measurements with Global Navigation Satellite System (GNSS) receivers, and data from UAV flight campaigns. Although the seismotectonic setting of the area is complex and there is an apparent mismatch between field and interferometric data, the results of our investigations suggest that at least three fault segments were reactivated by the major shocks of the March seismic sequence. These tectonic structureslikely represent the westward propagation of the Tyrnavos Graben, where newly formed and inherited low-angle faults interplay in a complex manner.

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Section: Mapping Of Fault Array and Documentation Of Ground Failuresmentioning

confidence: 99%

The March 2021 Damasi Earthquake Sequence, Central Greece: Reactivation Evidence across the Westward Propagating Tyrnavos Graben

et al. 2021

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“…Although remote-sensing is now sufficiently developed to generate datasets without contact-data, aerial photo-analysis, for instance, has long been considered to be a complement to field surveys [20]. Even methods that have gained prominence in recent years, such as structure-from-motion from aerial photographs [21,22] and UAV [23], still need to incorporate ground control data [24][25][26]. Remote sensing has therefore considerably helped the field of detection and mapping of mass movements, even if there is still scope to develop the method further for disaster-risk research [27].…”

Section: The Mapping Of Mass-movements From Aerial Remote-sensing Platformsmentioning

confidence: 99%

Deposits’ Morphology of the 2018 Hokkaido Iburi-Tobu Earthquake Mass Movements from LiDAR & Aerial Photographs

Gomez

Hotta

2021

Remote Sensing

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On 6 September at 03:08AM local time, a 33 km deep earthquake underneath the Iburi mountains triggered more than 7000 co-seismic mass movements within 25 km of the epicenter. Most of the mass movements occurred in complex terrain and became coalescent. However, a total of 59 mass movements occurred as discrete events and stopped on the semi-horizontal valley floor. Using this case study, the authors aimed to define planar and vertical parameters to (1) compare the geometrical parameters with rain-triggered mass movements and (2) to extend existing datasets used for hazards and disaster risk purposes. To reach these objectives, the methodology relies on LiDAR data flown in the aftermath of the earthquake as well as aerial photographs. Using a Geographical Information System (GIS), planform and vertical parameters were extracted from the DEM in order to calculate the relationship between areas and volume, between the Fahrböschung and the volume of the deposits, and to discuss the relationship between the deposit slope surface and the effective stress of the deposit. Results have shown that the relation S=k[Vd]2/3 (where S is the surface area of a deposit and Vd the volume, and k a scalar that is function of S) is k = 2.1842ln(S) − 10.167 with a R2 of 0.52, with less variability in deposits left by valley-confined processes compared to open-slope processes. The Fahrböschung for events that started as valley-confined mass-movements was Fc = −0.043ln(D) + 0.7082, with a R2 of 0.5, while for open-slope mass-movements, the Fo = −0.046ln(D) + 0.7088 with a R2 of 0.52. The “T-values”, as defined by Takahashi (2014), are displaying values as high as nine times that of the values for experimental rainfall debris-flow, signifying that the effective stress is higher than in rain-triggered counterparts, which have an increased pore pressure due to the need for further water in the material to be moving. For co-seismic debris-flows and other co-seismic mass movements it is the ground acceleration that “fluidizes” the material. The maxima found in this study are as high as 3.75.

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“…Rohmer en su indagación de los acantilados de Mesnil-Val al norte de Francia dedujo que el retroceso promedio fue de 15 cm/año (Rohmer & Dewez, 2015). Koukouvelas en su estudio mencionó la tasa de recesión aproximada de 35 mm/año en los acantilados de la Isla de Lefkada en Grecia (Koukouvelas et al, 2020). Tras estudios realizados en la Costa de Togo (Ensenada de Benin, margen de África occidental por Guerrera y otros autores se ha identificado que se presentan tasas máximas de retroceso del orden de 5 m/año (Guerrera et al, 2021).…”

Section: Monitoreo De La Dinámica De La Geomorfologíaunclassified

“…La recesión progresiva de los acantilados está en función de su estructura geológica (Costa et al, 2019;Allison 2020), propiedades físicas, mecánicas (Ayt Ougougdal et al, 2020) determinadas con los ensayos de campo y laboratorio (Severo et al, 2016), mineralogía, estructura litológica (Boualla et al, 2019;Calista et al, 2019), discontinuidades del macizo rocoso (Margottini et al, 2015), historia y cambio climático (Jenkins et al, 2007, Corominas et al, 2017 y del incremento de humedad en el suelo causado por las precipitaciones disminuyendo la resistencia del esfuerzo cortante (Barbosa et al, 2020). Proponen que dentro del análisis experimental se debe investigar estas características en forma integral junto con la topografía (Hobbs et al, 2019) y para su efecto recomiendan utilizar los vehículos aéreos no tripulados (UAV) colocando puntos de control en tierra (Warrick et al, 2017;Koukouvelas et al, 2020). El presente artículo está orientado a comprender y obtener un registro de la modificación de la línea costera a nivel mundial y los factores que inciden en la estabilidad de los acantilados con la finalidad de evitar catástrofes en zonas pobladas, motivar la ejecución de investigaciones para tomar acciones que mitiguen el retroceso del perfil costero y proteger estas zonas que por su geodiversidad algunos son considerados como geositios (Herrera-Franco et al, 2020).…”

Section: Introductionunclassified

Coastline modification at worldwide

Alcivar

Mero

Navarrete

et al. 2021

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La presente indagación bibliográfica pretende sintetizar información de las bases de reseñas de actividades científicas referente a la dinámica de la morfología de los acantilados a nivel mundial, mediante la recopilación de datos como: referencia bibliográfica, ubicación geográfica, método utilizado en la obtención de la tasa de retroceso, tipos de suelos que reflejan factores intrínsecos como las características físico-mecánicas, mineralógicas, geológicas y geomorfológicas, y factores extrínsecos entre los que podemos citar precipitaciones, clima, fuerza de los vientos, temperatura, acciones químicas del medio ambiente y en especial el cambio climático, que intervienen en la modificación de los acantilados de la línea de costa como consecuencias de erosiones sucesivas y deslizamientos. De la información recabada se obtuvo detalles de cinco países europeos, tres asiáticos, tres africanos, siete de América Latina y uno de Oceanía cuyos datos se encuentran plasmados en POWER ArcGIS. Concluyendo que el continente europeo tiene más información porque posee un sistema de satélites que es controlado por un programa

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Post-seismic monitoring of cliff mass wasting using an unmanned aerial vehicle and field data at Egremni, Lefkada Island, Greece

Cited by 30 publications

References 47 publications

The March 2021 Damasi Earthquake Sequence, Central Greece: Reactivation Evidence across the Westward Propagating Tyrnavos Graben

The March 2021 Damasi Earthquake Sequence, Central Greece: Reactivation Evidence across the Westward Propagating Tyrnavos Graben

Deposits’ Morphology of the 2018 Hokkaido Iburi-Tobu Earthquake Mass Movements from LiDAR & Aerial Photographs

Coastline modification at worldwide

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