1,721,066 research outputs found
GIS analysis of debris volume mobilized by heavy rainstorm in North-Eastern Sicily
No full textOn October 1st 2009, after a very rainy season, a violent rainstorm poured down Giampilieri, in North-Eastern Sicily with damages to property, buildings, roads, bridges and moreover, loss of human lives. The main focus of this work concerns the analysis of debris volume that has been carried out during this event through the definition of methodologies and determination of techniques that can be applied to evaluate assessment, define crisis scenarios and predict situations of possible debris-mud flows. Here, a series of open-source GIS-based algorithms using spatial analysis has been used in order to perform the calculation of debris-mud flows volume moved during rainstorm. By comparing the volume and run out of past events Rickenmann(Nat Hazards 19(1):47-77, 1999), it is possible to identify empirical site-specific formulas to estimate run out distance of potential events. The analysis issue helps in assessing risk for establishing policies of land planning and civil protection activities. © Springer-Verlag Berlin Heidelberg 2013
Contribution to the runout evaluation of potential debris flows in Peloritani Mountains (Messina, Italy)
No full textEspecially important for landslide prevention activities is to recognize the potential path of the debris flows from the triggering point to the stop. The huge number of debris flow (over 2000), occurred after 2007 in the Messina Municipality area, has allowed to evaluate the runout of these phenomena in the geographical area of the Peloritani Mountains. A preliminary runout analysis was carried out plotting the mobilized volume by phenomena multiplied the altitude difference (Δha) between the trigger point (Piff) and the stop point (Pip), in abscissa, and the distance travelled by the phenomena from the Piff to Pip, in the ordinate. Subsequently, these approach has been revised to make the applicability to potential phenomena more effective and easier to use. With this aim, was chosen to use the altitude difference (Δhb) between the trigger point (Piff) and the foot of the slope where the movement occurred. Starting from the location and size of the potential triggering areas and from the knowledge of the volume of the potentially mobilized material and basing on these curves, the runout of potential trigger areas has been estimated. . © Springer International Publishing Switzerland 2015
Preliminary remarks about rainfall thresholds for triggering debris flows on the Messina area
No full textMessina area (Italy) range stretches along the coast and have high relief energy. Huge rainfall events cause rapid gravitational phenomena classified as debris flows. The rampant urbanization developed in the last decades in the Messina Municipality has determined a fragile territorial settlement, prone to be heavily damaged by debris flows, as in October 2009. In order to support the community in tackling the risk conditions which it is subjected to, it is necessary to develop “non-structural” measures, characterized by a high level of environmental sustainability. The scientific community and the public authorities responsible for land management and involved in the mitigation of the geomorphological risk are paying a specialattention to the development of monitoring and alarm systems able to improve the current civil defence plans. Based on the historical information on rainfall, this study deals with the triggering thresholds of debris flows. The results provide additional elements to the knowledge of the critical rainfall, useful for developing effective early warning systems. . © Springer International Publishing Switzerland 2015
Landslides inventory in the Messina municipality area: Integration of historical and field survey data
No full textThrough the recording of historical and recent events data, three different landslides inventory of the Messina town territory have been created. The first collects information about localization and date of historical landslides occurred between the XVI century and 2011. The second collects ground effects induced by the 1908 earthquake registered in numerous technical reports compiled by expert researchers and technicians of that time. The third gathers recent landslides and was carried out through field activities, by reviewing aerial photographs for the years 2007 and 2009 and by analysis of Google satellite images. These three landslides inventories represent a source of specific information, essential for the knowledge and the analysis of the territory. They represent a valid tool not only for experts in the sector but also for everyone who faces the issues linked to the geomorphologic risk assessment. Nevertheless the information on the landslide characteristics constituted the basis for the definition of the landslide susceptibility map and landslides’ trigger rainfall thresholds of the area. . © Springer International Publishing Switzerland 2015
Debris flow risk assessment in the aguas calientes village (cusco, perù )
No full textIn this paper a landslide risk assessment in the area of Aguas Calientes village (Machu Picchu, Cusco, Perù) is applied. A study carried out into a capacity building project (FORGEO) was focused on localising source areas and runout of debris flows triggered by heavy rainfall in the Alcamayo catchment and on assessing debris flow intensity. Starting from an inventory of several previous debris flows occurred in the area, an evaluation of the local predisposing parameters to these events was used as input for susceptibility and hazard GIS based analysis. Empirical formulas reported in the literature were adapted to the research area context to estimate the runout of potential events. An analysis of exposure of structures and infrastructures was also performed during the project and high residual risk conditions were found for the Aguas Calientes village. These results may aid local authorities involved in land use planning, management policies and landslide risk reduction. © Springer-Verlag Berlin Heidelberg 2013
Geomorphological processes and cultural heritage of Maca and Lari Villages: An opportunity for sustainable tourism development in the Colca Valley (Province of Caylloma, Arequipa, South Perù)
No full textFamous because of its deepness and beauty of the landscape, Colca Valley is one of the main places of tourist attraction in Peru. Maca and Lari are two of the valley villages, facing each other on opposite banks of the Colca River. High slope energy is only one of the factors causing a widespread landslide activity, triggered primarily by seismic activity. A study carried out into a capacity building project (FORGEO) was focused on mapping landslide source areas in the territory of both the villages. Starting from an inventory of several previous phenomena occurred in the area, an evaluation of the local predisposing parameters to these events was used as input for susceptibility and hazard GIS based analysis. An assessment of exposure of structures and infrastructures was also performed, detecting residual risk condition in the territories of both villages. The role of rainfall and groundwater in local landslide processes is stressed in this paper as well as the effectiveness of an adequate water management in landslide risk reduction and sustainable land use planning. © Springer-Verlag Berlin Heidelberg 2013
Landslide hazard assessment project in the Messina municipality area (Sicily, Italy)
No full textIn the last 4 years Messina Municipality has been hit by rainfall events that triggered a great number of debris flows. Due to 2009 event ENEA started landslide hazard researches in the south of the Municipality. Messina territory (210 km2) is located at the NE culmination of Peloritani Range, formed by seven metamorphic Units covered by late orogenic terrigenous formations and by Plio-Pleistocene deposits. Steep slopes lead to high erosion rates, that increased in last years because of intense rainfall. The first step of the hazard assessment method is an inventory of landslides, followed by the detection of landslide parameters. Through GIS analysis of this parameters landslide susceptibility is assessed. Geomorphological analysis allows evaluating the runout and energy of the future events. Rainfalls data analysis allows definition of triggering threshold for the area. These parameters will be tested in a test site field for the measurement of soil saturation. © Springer-Verlag Berlin Heidelberg 2013
Figure 2 in Two new species of Diospyros (Ebenaceae) from New Guine
No full textFigure 2. Map showing the distribution of Diospyros multimaculata (●) and D. tehno (▲) in New Guinea.Published as part of Puglisi, C., Jimbo, T. & Hagwood, A., 2022, Two new species of Diospyros (Ebenaceae) from New Guine, pp. 1-10 in Edinburgh Journal of Botany 79 on page 6, DOI: 10.24823/EJB.2022.1879, http://zenodo.org/record/737424
Figure 4. Diospyros tehno C in Two new species of Diospyros (Ebenaceae) from New Guine
No full textFigure 4. Diospyros tehno C.Puglisi, Jimbo & Hagwood. A, Fruit; B, cauliflorous stem; C, leaves. All photographs of the type collection, Jimbo, Hagwood, Sule, Aika, Maharape, Cook LAE 91326 (LAE), taken by T. Jimbo and A. Hagwood.Published as part of Puglisi, C., Jimbo, T. & Hagwood, A., 2022, Two new species of Diospyros (Ebenaceae) from New Guine, pp. 1-10 in Edinburgh Journal of Botany 79 on page 8, DOI: 10.24823/EJB.2022.1879, http://zenodo.org/record/737424
A database of the coseismic effects following the 30 October 2016 Norcia earthquake in Central Italy
No full textWe provide a database of the coseismic geological surface effects following the Mw 6.5 Norcia earthquake that hit central Italy on 30 October 2016. This was one of the strongest seismic events to occur in Europe in the past thirty years, causing complex surface ruptures over an area of >400 km 2. The database originated from the collaboration of several European teams (Open EMERGEO Working Group; about 130 researchers) coordinated by the Istituto Nazionale di Geofisica e Vulcanologia. The observations were collected by performing detailed field surveys in the epicentral region in order to describe the geometry and kinematics of surface faulting, and subsequently of landslides and other secondary coseismic effects. The resulting database consists of homogeneous georeferenced records identifying 7323 observation points, each of which contains 18 numeric and string fields of relevant information. This database will impact future earthquake studies focused on modelling of the seismic processes in active extensional settings, updating probabilistic estimates of slip distribution, and assessing the hazard of surface faulting. © 2018 The Author(s)
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