Hydraulic stream network conditioning by a tectonically induced, giant, deep-seated landslide along the front of the Apennine chain (south Italy)

Galeandro, Annalisa; Doglioni, Angelo; Guerricchio, A; Simeone, Vincenzo

doi:10.5194/nhess-13-1269-2013

Cited by 14 publications

(3 citation statements)

References 38 publications

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“…The repeated filling-drawdown cycles and rainfall are the main factors that affect the stability of the Sanmshan landslide (Zangerl et al, 2010;Paronuzzi et al, 2013;Galeandro et al, 2013). Based on a statistical analysis of the historical data, the reservoir level and rainfall values are determined, as follows.…”

Section: Historical Reservoir Level Variations and Rainfall Datamentioning

confidence: 99%

Partial reactivation of a huge deep-seated ancient rock slide: recognition, formation mechanism, and stability

Tang

Liu

et al. 2016

Nat. Hazards Earth Syst. Sci.

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Abstract. About 18 years ago, a large-scale discontinuous layer in properties and colour was found in the new Fengjie town at the shore of the Three Gorges Reservoir area in China. There are many resettled residents and buildings on the sloping area, the safety of which is potentially affected by this layer, so it has become the focus of attention. Before this study started there were two viewpoints regarding the origin of this layer. One was that is was from a huge ancient slide and the other was that is was from a fault graben. In order to find out how it was formed and to be able to carry out a stability analysis of the slope the authors have carried out a research program, including geological field investigations and mapping, a deep drilling hole, a geotechnical centrifuge model test, and a simulation analysis. The results of the research led to the conclusion that the layer is the sliding plane of a huge deep-seated ancient rock slide, which we called the Sanmashan landslide. An important argument for the conclusion is the recognition of a regional compressive tectonic stress field in this area, which cannot lead to the formation of a fault graben because it needs a tensional tectonic stress field. Moreover, numerous unique geological features, sliding marks, and other relics of the ancient slide have been discovered in the field. The formation process of the ancient slide could be repeated in a large geotechnical centrifuge model test. The test shows that a deformation and failure process of "creep–crack–cut" has occurred. The type of the ancient slide can be classified as a "successive rotational rock slide". Finally, the role of seepage in the stability of the Sanmashan landslide has been analysed. Our final conclusions are that, during rainfall and filling–drawdown cycles in the Three Gorges Reservoir, the Sanmashan landslide as a whole is dormant and stable and the secondary landslides in the toe area of the slope are presently stable but can be reactivated. This research provides an important basis for the remedial measures and land use planning in the new Fengjie town, and a well-documented case history for researchers worldwide.

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Section: Historical Reservoir Level Variations and Rainfall Datamentioning

confidence: 99%

Partial reactivation of a huge deep-seated ancient rock slide: recognition, formation mechanism, and stability

Tang

Liu

et al. 2016

Nat. Hazards Earth Syst. Sci.

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“…WT analysis can be used in different applications, viz., (i) multi-scale analysis [38,39]. (ii) land-feature detection and extraction [40,41]. (iii) filtering [42]; and (iv) data compression and reconstruction [43].…”

Section: Introductionmentioning

confidence: 99%

Time-frequency analysis of radon and thoron data using continuous wavelet transform

Rasheed,

Osama,

Rafique

et al. 2023

Phys. Scr.

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Continuous exposure to environmental radiation, whether it derives from natural or artificial sources, is thought to pose a substantial risk to public health. In addition to the health effects associated with prolonged exposure to environmental radiations, long-term measurements of these radiations can be used for a variety of beneficial purposes, such as the forecasting of impending earthquakes. Signal processing is an important application used for the purpose of forecasting. Wavelets, being signal-processing tools, are helpful in many applications such as anomaly detection in time series data. However, selection of the best wavelet for a particular application is still a problem that hasn’t found a satisfactory solution. In this study, we used continuous wavelet transform (CWT) on environmental radiations, specifically radon time series (RTS) and thoron time series (TTS) data, for the investigation of time-frequency information (TFI). The distribution of energy in the output wavelet decomposition have been investigated by several wavelet families such COIF4, DB4, SYM4 to detect frequency composition of signal and its relation with anomalies hidden in the observed data. Using discrete wavelet transform (DWT), specifically SYM4, DB4, and COIF4, we transformed the radon and thoron time series into a time-dependent sum of frequency components. Using CWT scalograms, the anomalies in the both of time series datasets (TSD) have been identified, and these anomalies have been associated with the seismic events that occurred during the period of the study. The results show that DB4 and SYM4 wavelets are good at identifying anomalies in original radon and thoron TSD, but SYM4 performs better for DWT-decomposed radon and thoron TSD.

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“…These DSGSD periodical reactivations may induce intensification of mass wasting and water erosion processes along the weaker portion of slopes (Mortara and Sorzana, 1987, and references therein). These deep deformations may severely affect the hydrographic patterns (Galeandro et al, 2013) until the complete obliteration of the stream network (Korup, 2005), inducing changes in water erosional patterns.…”

Section: Introductionmentioning

confidence: 99%

Alpine gullies system evolution: erosion drivers and control factors. Two examples from the western Italian Alps

et al. 2019

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Denudation processes affecting mountain slopes may vary according to different factors (e.g., lithology and structural setting of bedrock, climate, relief features), which may be very diverse at the local scale. Gully complex systems, characterised by morphological features similar to those developing in other climate contexts (i.e., pseudo-badlands) are also becoming common at higher altitudes and latitudes. The *Revised manuscript with no changes marked Click here to view linked References selected study cases of Gran Gorgia (Susa Valley) and Saint Nicolas (Aosta Valley), in the Western Italian Alps, are sites of geomorphological interest as they are specifically relevant for their scientific features. The aims of this work are (i) reconstructing the morphometric evolution of gullies edges and vegetation colonisation in specific years by means of multitemporal spatial analysis on variation of surface areas affected by erosion; (ii) performing dendrogeomorphological analysis to spatially reconstruct, with a more continuous record through time, the effects of denudation processes affecting trees colonising the different regions of the gullies and the erosion rates by using dendrogeomorphological indicators (i.e., compression wood, traumatic resin ducts) and exposed roots and (iii) performing geopedological investigations aimed at deriving data on aggradation/degradation episodes along the slopes surrounding such hot-spots of erosion through time. Multidisciplinary analyses regarding the study sites allowed for detailing of erosional history of the studied slopes detecting the prevailing drivers of their evolution. According to the results and considering the common climate and bedrock conditions, the structural background seems to have more influence on slope evolution at the Saint Nicolas site, while superficial geomorphic processes seem to be more relevant at the Gran Gorgia site. Because the sites have already been recognised as part of geoheritage by local authorities, the data obtained in the present research on their genesis, evolution, and local drivers affecting the rates of denudation (i.e., scientific relevance of the site) suggests that description of the sites for dissemination purposes should include links to the entire slope history.

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Hydraulic stream network conditioning by a tectonically induced, giant, deep-seated landslide along the front of the Apennine chain (south Italy)

Cited by 14 publications

References 38 publications

Partial reactivation of a huge deep-seated ancient rock slide: recognition, formation mechanism, and stability

Partial reactivation of a huge deep-seated ancient rock slide: recognition, formation mechanism, and stability

Time-frequency analysis of radon and thoron data using continuous wavelet transform

Alpine gullies system evolution: erosion drivers and control factors. Two examples from the western Italian Alps

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