The Post-Forum Study Tour following the 4th World Landslide Forum 2017 in Ljubljana (Slovenia) focuses on the variety of landslide forms in Slovenia and its immediate NW surroundings, and the ...best-known examples of devastating landslides induced by rainfall or earthquakes. They differ in complexity of the both surrounding area and of the particular geological, structural and geotechnical features. Many of the landslides of the Study Tour are characterized by huge volumes and high velocity at the time of activation or development in the debris flow. In addition, to the damage to buildings, the lives of hundreds of people are also endangered; human casualties occur. On the first day, we will observe complex Pleistocene to recent landslides related to the Mesozoic carbonates thrust over folded and tectonically fractured Tertiary siliciclastic flysch in the Vipava Valley (SW Slovenia), serving as the main passage between the Friulian lowland and central Slovenia, and thus also an important corridor connecting Northern Italy to Central Europe. A combination of unfavourable geological conditions and intense short or prolonged rainfall periods leads to the formation of different types of complex landslides, from large-scale deep-seated rotational and translational slides to shallow landslides, slumps and sediment gravity flows in the form of debris or mudflows. The second day of the study tour will be held in the Soča River Valley located in NW Slovenia close to the border with Italy, where the most catastrophic Stože landslide in Slovenia recently caused the deaths of seven people, and the nearby Strug landslide, which is a combination of rockfall, landslide and debris flow. The final day of the Post-Forum Study Tour will start in the Valcanale Valley located across the border between Slovenia and Italy, severely affected by a debris flow in August 2003. The flow caused the deaths of two people, damaged 260 buildings; large amounts of deposits blocked the A23 Highway, covering both lanes. In Carinthia (Austria), about 25 km west of Villach, the Dobrač/Dobratsch multiple scarps of prehistoric and historic rockslides will be observed. Dobratsch is a massive mountain ridge with a length of 17 km and a width of 6 km, characterized by steep rocky walls. The 3-day study tour will conclude with a presentation of the Potoška planina landslide, a slide whose lower part may eventually generate a debris flow and therefore represents a hazard for the inhabitants and for the infrastructure within or near the village of Koroška Bela.
Fascinating and fragile environments as are the underground estuaries, need to be studied, understood and protected for present and future generations. Even if wide and abundant bibliography related ...to tides and their behaviour with respect to the external estuaries is available, none dealed with the estuary caves and the related hydrogeology. This paper aims to partially fill this gap presenting a preliminary study done at the Puerto Princesa Underground River (PPUR), in the Palawan Island (Philippines). The data was collected during the last expedition (November 2016) organised by La Venta, in which some of the authors took part. During the survey, the cave has been instrumented with in continuous diver data-logger devices (CTD) recording temperature (T), electrical conductivity (EC) and water level fluctuations. Longitudinal and vertical water hydrogeological profiles of the cave were realised with the aim of understanding the dynamics of the waters during different hydrogeological regimes in combination with salt water intrusion. In addition, a bathymetric profile was done to better identify the point where to realise the vertical logs. A significant rainstorm occurred during the expedition, lasting for approximately 12 hours resulting in 80 mm of rain, and its effects gave the re searchers the opportunity to analyse the hydrodynamics of the flowing waters during a flood. In normal flow conditions, the longitudinal logs highlighted the presence of freshwater inlets and the vertical logs testified to a clear stratification of the waters (freshwaters at the surface and brackish waters at the bottom). During floods, the EC and T data showed evidence of a fast substitution of the resident waters.
In the last 15 years some large karst aquifers of Italy were studied to realize maps of intrinsic and integrated vulnerability to pollution on the basis of the point count system model SINTACS. The ...most important characteristics are: the heterogeneity levels of the drainage networks; the level of karst evolution both on the surface and deep into the aquifer; the thickness of the unsaturated zone (which is often highly karstified). In order to obtain a better fitting of the intrinsic vulnerability map with the real situation, the SINTACS values for some of the parameters were sometimes changed with respect to the official ones. The present paper proposes tables in order to obtain a better fitting between the map of integrated and intrinsic vulnerability to pollution and the hydrostructural conditions.
To set an approach for the future territorial planning, the Geological Survey of Friuli Venezia Giulia Region, through the researchers of Trieste University, started a program of debris-flow risk ...analysis using Flo-2D software as tool to delimit the hazardous areas. In the present paper, as a case study, a debris flow, called Fella sx, occurring in a torrent catchment was analyzed. The choice was due to the abundance of information about past events, inundated areas, rain fall, geology and to its representativeness. An initial back-analysis investigation identified a couple of representative rheological parameters. Riverbed samples were collected, sieve analyses were performed and rheological tests were carried out on the fraction finer than 0.063 mm using a rotationally controlled stress rehometer equipped with the serrated parallel plate geometry. The shear dependent behaviour was examined at different concentrations ranging from 33 to 48%, by weight. Viscosity data treatment was performed to determine the most suitable rheological model to provide the best approximation of the debris-flow behaviour. The rheological parameters, derived from experimental data, were used and compared with those obtained through the back-analysis and with the real inundated area. Data obtained through rheological analysis are useful in constructing scenarios of future events where no data for back-analysis are available.
The present study comparatively examined the socio-political and economic transformation of the indigenous Sámi in Sweden and the Indian American in the United States of America occurring first as a ...consequence of colonization and later as a product of interaction with the modern territorial and industrial state, from approximately 1500 to 1900. The first colonial encounters of the Europeans with these autochthonous populations ultimately created an imagery of the exotic Other and of the noble savage. Despite these disparaging representations, the cross-cultural settings in which these interactions took place also produced the hybrid communities and syncretic life that allowed levels of cultural accommodation, autonomous space, and indigenous agency to emerge. By the nineteenth century, however, the modern territorial and industrial state rearranges the dynamics and reaches of power across a redefined territorial sovereign space, consequently, remapping belongingness and identity. In this context, the status of indigenous peoples, as in the case of Sámi and of Indian Americans, began to change at par with industrialization and with modernity. At this point in time, indigenous populations became a hindrance to be dealt with the legal re-codification of Indigenousness into a vacuumed limbo of disenfranchisement. It is, thus, the modern territorial and industrial state that re-creates the exotic into an indigenous Other. The present research showed how the initial interaction between indigenous and Europeans changed with the emergence of the modern state, demonstrating that the nineteenth century, with its fundamental impulses of industrialism and modernity, not only excluded and marginalized indigenous populations because they were considered unfit to join modern society, it also re-conceptualized indigenous identity into a constructed authenticity.
En los últimos 15 años, algunos de los más grandes acuíferos cársticos italianos han sido estudiados con el fin de realizar mapas de vulnerabilidad intrínseca e integrada a la contaminación ...utilizando el método SINTACS. La búsqueda ha evidenciado que algunas características peculiares de los acuíferos cársticos pueden llegar a dificultar la definición de un valor fijo para los 7 parámetros SINTACS. Entre estas características, las más importantes son: el diferente nivel de heterogeneidad del sistema de drenaje, el diferente nivel de carstificación sea a nivel superficial o profundo, el espesor de la zona no saturada (a menudo de poco espesor, pero altamente carstificada). Por lo tanto para obtener una mejor conexión del mapa de la vulnerabilidad con la situación real existente en un determinado acuífero cárstico, los valores SINTACS para algunos parámetros han sido en ocasiones cambiados respecto a los valores oficiales. En este trabajo se presenta una propuesta preliminar de nueva puntuación, para obtener una mejor concordancia entre los mapas de vulnerabilidad intrínseca e integrada a la contaminación y a las condiciones hidroestructurales que pueden cambiar en los acuíferos cársticos.doi: doi en revision
Action-Based Multi-Camera Synchronization Zini, L.; Cavallaro, A.; Odone, F.
IEEE journal on emerging and selected topics in circuits and systems,
06/2013, Letnik:
3, Številka:
2
Journal Article
Recenzirano
We propose a video alignment method based on observing the actions of a set of articulated objects. Given object association information, the proposed video synchronization method is applicable to ...general and unconstrained scenarios in a way that is not feasible with current state-of-the-art approaches: the proposed method does not impose constraints on the relative pose or motion of the cameras, on the structure of the time warping between the videos and on the amount of overlap among the fields-of-view. The proposed method uses a high-level video analysis (object actions) and models the alignment as a frame association problem (as opposed to the traditional continuous time warping). We present a qualitative and quantitative analysis of the results in real-world complex scenarios, showing the robustness of the method and higher accuracy compared to the only approach from the literature that works under similar conditions.
Precise people counting in real time Zini, Luca; Noceti, Nicoletta; Odone, Francesca
2013 IEEE International Conference on Image Processing,
09/2013
Conference Proceeding
In this paper we propose a motion-based people counting algorithm that relies on a weak camera calibration and produces a smooth estimate of the number of people in the scene. The method performs an ...analysis of the severity of possible occlusions and the integration of instantaneous observations over time. The key features of the algorithm are a simple pipeline, a small computational cost, the use of a model-free approach that does not need complex training procedures and its ability to work in different types of scenarios. We report results on both benchmark and acquired in-house datasets of different degrees of complexity, showing how our solution achieves comparable or superior performances with respect to state-of-art methods, while providing real-time performances.
This work aims at evaluating mercury (Hg) occurrence, spatial distribution and speciation in groundwater of the Isonzo/Soča River upper alluvial plain downstream from the Idrija Hg mine (Western ...Slovenia). Several wells and piezometers were sampled both in static and dynamic mode. Total (THg) and filtered (FHg) concentrations were generally higher in static (THg, 1.87-855 ng L
; FHg, 0.20-13.61 ng L
) than in dynamic mode (THg, 0.08-78.77 ng L
; FHg, 0.28-6.65 ng L
). The estimated background value accounts for 2-3 ng L
. On the basis of hydrochemistry and isotopic composition, the main sources of groundwater were established. Hg concentrations in the Slovenian sector, supplied by local rainfall, are comparable to values measured close to the Isonzo River. Possible further Hg local sources have been suggested. Stability field analysis for the aqueous Hg species revealed that in the presence of chloride Hg solubility may be increased by the formation of chlorocomplexes. Mercury that rarely enters reduced surrounding conditions can be bound to sulphur to form polysulphide species depending on the pH of water. Since Hg-contaminated alluvial sediments of the Isonzo River may act as a secondary Hg source in groundwater, a borehole was dug down to the water table. Mercury content and speciation revealed that cinnabar (HgS) is the prevalent form followed by the matrix-bound Hg (Hg
). Variations of the physico-chemical boundary conditions, as well as the raising/lowering of the water table, may be locally responsible for the slight variability of Hg concentrations in the aquifer.
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