1,720,974 research outputs found
Morphometric dynamic analysis, distribution and topographic features of landslide in north-western region of Italian Alps (Valle D’Aosta)
No full textPhD Thesis about the study and morpho-evolution analysis of Mont de la Saxe landslide by geomorphometry and geomorphology approach on Terrestrial Laser Scanner dataset.
Detailed analysis of DTMs and a discussion of their various applications and derived geothematic/geomorphometric products and application is a recent goal become necessary due to the high volume of “3D” data.We are in an historical moment where “coarse” 3D representations (10 to 50 m) are overtaken by the “high resolution” models (1cm to 1m). These new methodologies and techniques ( Structure for Motion techniques) are useful to define geomorphological and morphodynamic models of study areas.Now it's important to work in integrated methods for geomorphological and models analysis and hazard motion maps in order to define the real effectiveness of Landform definition and modification of the present topography through high-resolution techniques , also for reconstructing recent geodynamic history of the area.The goal is to define data, methods and elaboration useful to represent as best as possible, out Morphometric dynamism analysis
Valutazione della pericolosità per alluvione e vulnerabilità dei siti al fine di definire il rischio idraulico e le misure di mitigazione possibili. Caso studio del Comune di Höne (AO)
Full text linkLandslide geomorphometric analysis based on high resolute Lidar
No full textUsing several Lidar data from airborne and terrestrial laser scanner we developed an integrated method to realize 3D morphodynamic model and map the landslide hazard. Raster and tracking process analysis permit to detected terrain roughness, mass movements and volumetric balance. The dendritic terrain processing on the raw DEM allow to define a high resolute HydroDEM and the drainage density area influencing the landslide. Future targets of the work aim to stress the method in other case study
Hydro-geomorphometrical characterization of a mountain basin using GIS
No full textUsing a 2m DTM we realized a high level topographical and morphological characterization of a mountain basin. The method compares different approaches for hydrologic terrain analysis to estimate the potential dynamic phenomena areas. The analysis focuses on the terrain preprocessing using ArcHydro. Furthermore, we tested the use of terrestrial laser scanner and drone survey to create dynamic 3D simulation of rapid mass movement concerning natural hazard phenomena. GIS is a helpful instrument for the public administration to evaluate the analysis results
Preliminary relation between different spring vulnerability methods applied on two alpine springs. (Regione Autonoma Valle d'Aosta)
No full textTerrestrial Laser Scanner Acquisition For Snow Depth and Groundwater Recharge Quantification in an Alpine Basin
Full text linkClimate change is the main factor that induces alterations in the hydrological cycle and mountains represent its first indicators, because they respond rapidly and intensely to climatic and environmental modifications. Obtaining reliable scenarios on water resources availability is a prerequisite to planning management measures. The snowfall and the resulting seasonal snow cover represent an important source of water, including surface and subsurface flows. A terrestrial laser scanning (TLS) was employed to measure snow depth and snow cover in the Mascognaz basin at 1850 m (Ayas municipality, Regione Autonoma Valle d'Aosta, Italy). We choose this site because the Politecnico di Torino installed an advanced meteorological station in 2010 (equipped with sensors measuring snow depth, snow density and snow water equivalent). Furthermore downstream the area are located two springs, both equipped with probes measuring water level, temperature and electrical conductivity. The aim of this study is to recognize the accumulation areas from melting areas through the generation of high dense digital snow elevation model. In this way is possible better understand the snowmelt process that contributes widely to the groundwater recharge. We used the Riegl VZ 4000 that is very powerful for measurements of snowcovered surfaces in high alpine catchment thanks to the long-range acquisition. The TLS monitoring consists in three phases: a summer acquisition, with the purpose to obtain a DSM (Digital Surface Model); a winter acquisition, that aims to evaluate accurately the snow cover and the snow accumulation areas and a spring acquisition with the purpose to investigate the snow-pack development and evaluate the available volume of water generate by snow during the melting phenomena. Finally, we used the ArcGIS 10.2 software to improve spatial analysis evaluation, estimate the Snow Water Equivalent (SWE). and obtain important information on the amount of water resources available for human consumptio
GIS-based Evaluation of Mine Water Quality in West Bokaro Coalfield, India
No full textFifteen mine water samples collected from different mining areas of West Bokaro coalfield, India were analysed for pH, EC, major cations, anions and trace metals. For assessing the suitability of drinking water, the water quality data of the analyzed samples were compared with the prescribed drinking water standard of WHO and BIS (IS:10500).The some spatial distribution maps of the above mentioned parameters were prepared by using GIS 10.2 softwar
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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