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The wide range of gypsum facies observed all over the world and the strong heterogeneity that may be present even within a single facies often cause an inhomogeneous mechanical response that, if neglected, may be particularly dangerous in the framework of underground excavations. In addition, gypsum is particularly sensible to the presence of water. The high relative humidity conditions often registered in underground gypsum quarries may imply an additional worsening of mechanical properties. In the present study, the strength and the creep response of a natural gypsum rock facies are investigated, considering the influence of material heterogeneity and relative humidity conditions. The heterogeneity of the material, quantified with MIP and SEM analyses, is observed to strongly affect the mechanical response. To this intrinsic mechanical variability, the influence of an external parameter as the relative humidity is observed to generate an additional reduction of material strength and to increase the creep strain rate in the long-term tests. The effect of all these elements in the underground quarry framework is discussed and a constitutive model of these experimental results is provided.
Anna Ramon; Chiara Caselle; Sabrina Maria Rita Bonetto; Daniele Costanzo; Eduardo E. Alonso. Effect of Microstructure and Relative Humidity on Strength and Creep of Gypsum. Rock Mechanics and Rock Engineering 2021, 1 -25.
AMA StyleAnna Ramon, Chiara Caselle, Sabrina Maria Rita Bonetto, Daniele Costanzo, Eduardo E. Alonso. Effect of Microstructure and Relative Humidity on Strength and Creep of Gypsum. Rock Mechanics and Rock Engineering. 2021; ():1-25.
Chicago/Turabian StyleAnna Ramon; Chiara Caselle; Sabrina Maria Rita Bonetto; Daniele Costanzo; Eduardo E. Alonso. 2021. "Effect of Microstructure and Relative Humidity on Strength and Creep of Gypsum." Rock Mechanics and Rock Engineering , no. : 1-25.
In arid and semi-arid areas, human health and economic development depend on water availability, which can be greatly compromised by droughts. In some cases, the presence of natural contaminants may additionally reduce the availability of good quality water. This research analyzed the water resources and hydrochemical characteristics in a rural area of the central Main Ethiopian Rift Valley, particularly in the districts of Shashemene, Arsi Negelle, and Siraro. The study was developed using a census of the main water points (springs and wells) in the area and the sampling and physico-chemical analysis of the water, with particular regard to the fluoride concentration. In many cases, fluoride content exceeded the drinking water limits set by the World Health Organization, even in the absence of anthropogenic contamination. Two different aquifers were recognized: A shallow aquifer related to the eastern escarpment and highlands, and a deep aquifer in the lowland areas of the rift valley on the basis of compositional changes from Ca–Mg/HCO3 to Na–HCO3. The distribution of fluoride, as well as pH and EC values, showed a decrease from the center of the lowlands to the eastern highlands, with similar values closely aligned along an NNE/SSW trend. All these data contribute to creating awareness among and sharing information on the risks with rural communities and local governments to support the adequate use of the available water resources and to plan appropriate interventions to increase access to fresh water, aimed at the sustainable human and rural local development of the region.
Sabrina Bonetto; Chiara Caselle; Domenico de Luca; Manuela Lasagna. Groundwater Resources in the Main Ethiopian Rift Valley: An Overview for a Sustainable Development. Sustainability 2021, 13, 1347 .
AMA StyleSabrina Bonetto, Chiara Caselle, Domenico de Luca, Manuela Lasagna. Groundwater Resources in the Main Ethiopian Rift Valley: An Overview for a Sustainable Development. Sustainability. 2021; 13 (3):1347.
Chicago/Turabian StyleSabrina Bonetto; Chiara Caselle; Domenico de Luca; Manuela Lasagna. 2021. "Groundwater Resources in the Main Ethiopian Rift Valley: An Overview for a Sustainable Development." Sustainability 13, no. 3: 1347.
An in-depth knowledge of the geostructural characteristics of the territory is fundamental for optimizing the design of artificial structures. Feasibility, costs, duration, and issues of the works are strictly correlated with the geological, geomechanical, and in situ stress features of the area. Remotely sensed data represent a source of information for detecting tectonic structures that can be complementary to traditional surveys, with the advantage of being cheaper, of covering large areas and of reducing time for surveying. The study of the regional tectonic setting together with local structural features is fundamental to define the far-field tectonic stress and for correctly modeling the induced stress during excavation activities and monitoring stress variations. A multiscale and multidisciplinary approach was set up and applied to an area in the Alpi Apuane marble district (Tuscany, Italy). Visually and semi-automatically detected geological structures were analyzed and correlated to data from in-situ measurements in four underground marble quarries, to define the far-field stress state. This study is also an attempt to bridge the gap between structural geology analysis and remotely sensed data for far-field stress definition, correlating on-field kinematic observations and in situ stress measurements.
Sabrina Maria Rita Bonetto; Federico Vagnon; Gessica Umili; Davide Vianello; Maria Rita Migliazza; Anna Maria Ferrero. The contribution of remotely sensed data to the stress state evaluation in underground marble quarries. The Egyptian Journal of Remote Sensing and Space Science 2021, 24, 1 -13.
AMA StyleSabrina Maria Rita Bonetto, Federico Vagnon, Gessica Umili, Davide Vianello, Maria Rita Migliazza, Anna Maria Ferrero. The contribution of remotely sensed data to the stress state evaluation in underground marble quarries. The Egyptian Journal of Remote Sensing and Space Science. 2021; 24 (1):1-13.
Chicago/Turabian StyleSabrina Maria Rita Bonetto; Federico Vagnon; Gessica Umili; Davide Vianello; Maria Rita Migliazza; Anna Maria Ferrero. 2021. "The contribution of remotely sensed data to the stress state evaluation in underground marble quarries." The Egyptian Journal of Remote Sensing and Space Science 24, no. 1: 1-13.
The Hodh el Chargui, a region located in the south-east of the Mauritania at 1000 km to the capital city of Nouakchott, is one of the poorer and remoter areas of the country. It is characterised by hard and in rural environment. Farmers and agro-pastoralists are the main economic actors and completely depend on natural resources. A specific project entitled “Reducing Agro-pastoral Vulnerability and Improving Resilience in Hodh el Chargui”, funded by European Union, has been implemented in the Program “Institutional Strengthening in Mauritania towards Agricultural and Pastoral Resilience (RIMRAP)”. The aims of the project are the strengthening of the resilience of Hodh el Chargui communities and the reduction of their vulnerability to crisis, assuring access to natural resources and their sustainable use. In particular, the water resource is fundamental to assure the development of the traditional agricultural and pastoral activities and guarantee proper health conditions. The present study reports the results obtained from a census of the well in the Hodh el Chargui, their distribution in the region and the main features of groundwater resource.
Chiara Caselle; Manuela Lasagna; Sabrina Maria Rita Bonetto; Domenico Antonio De Luca; Stefano Bechis. Groundwater features in Hoedh el Chargui, Mauritania. Acque Sotterranee - Italian Journal of Groundwater 2020, 9, 1 .
AMA StyleChiara Caselle, Manuela Lasagna, Sabrina Maria Rita Bonetto, Domenico Antonio De Luca, Stefano Bechis. Groundwater features in Hoedh el Chargui, Mauritania. Acque Sotterranee - Italian Journal of Groundwater. 2020; 9 (4):1.
Chicago/Turabian StyleChiara Caselle; Manuela Lasagna; Sabrina Maria Rita Bonetto; Domenico Antonio De Luca; Stefano Bechis. 2020. "Groundwater features in Hoedh el Chargui, Mauritania." Acque Sotterranee - Italian Journal of Groundwater 9, no. 4: 1.
The Eurocode 7 or EC7 is the Reference Design Code (RDC) for geotechnical design including rock engineering design within the European Union (EU). Moreover, its principles have also been adopted by several other countries, becoming a key design standard for geotechnical engineering worldwide. It is founded on limit state design (LSD) concepts, and the reliability of design is provided mainly by a semi-probabilistic method based on partial factors. The use of partial factors is currently an advantage, mainly for the simplicity in its applicability, and a limitation, especially concerning geotechnical designs. In fact, the application of partial factors to geotechnical design has proven to be difficult. In this paper, the authors focus on the way to apply EC7 principles to rock engineering design by analyzing the design of rockfall protection structures as an example. A real case of slope subjected to rockfall is reported to outline the peculiarity connected to rock engineering. The main findings are related to the complementarity of the reliability-based design (RBD) approach within EC7 principles and the possibility of overcoming the limitations of a partial factor approach to this type of engineering problem.
Federico Vagnon; Sabrina Bonetto; Anna Ferrero; John Harrison; Gessica Umili. Eurocode 7 and Rock Engineering Design: The Case of Rockfall Protection Barriers. Geosciences 2020, 10, 305 .
AMA StyleFederico Vagnon, Sabrina Bonetto, Anna Ferrero, John Harrison, Gessica Umili. Eurocode 7 and Rock Engineering Design: The Case of Rockfall Protection Barriers. Geosciences. 2020; 10 (8):305.
Chicago/Turabian StyleFederico Vagnon; Sabrina Bonetto; Anna Ferrero; John Harrison; Gessica Umili. 2020. "Eurocode 7 and Rock Engineering Design: The Case of Rockfall Protection Barriers." Geosciences 10, no. 8: 305.
This research investigates fundamental problems in object recognition in earthen heritage and addresses the possibility of an automatic crack detection method for rammed earth images. We propose and validate a straightforward support vector machine (SVM)-based bidirectional morphological approach to automatically generate crack and texture line maps through transforming a surface image into an intermediate representation. Rather than relying on the application of the eight connectivity rule to a combination of horizontal and vertical gradient to extract edges, we instruct an edge classifier in the form of a support vector machine from features computed on each direction separately. The model couples a bidirectional local gradient and geometrical characteristics. It constitutes of four elements: (1) bidirectional edge maps; (2) bidirectional equivalent connected component maps; (3) SVM-based classifier and (4) crack and architectural line feature map generation. Relevant details are discussed in each part. Finally, the efficiency of the proposed algorithm is verified in a set of simulations that is satisfactorily conforming to labeled data provided manually for surface images of earthen heritage.
Mahshid Zeighami Moghaddam; Gessica Umili; Vito Messina; Sabrina Bonetto; Anna Maria Ferrero; Gaia Bollini; David Gandreau. An SVM-Based Scheme for Automatic Identification of Architectural Line Features and Cracks. Applied Sciences 2020, 10, 5077 .
AMA StyleMahshid Zeighami Moghaddam, Gessica Umili, Vito Messina, Sabrina Bonetto, Anna Maria Ferrero, Gaia Bollini, David Gandreau. An SVM-Based Scheme for Automatic Identification of Architectural Line Features and Cracks. Applied Sciences. 2020; 10 (15):5077.
Chicago/Turabian StyleMahshid Zeighami Moghaddam; Gessica Umili; Vito Messina; Sabrina Bonetto; Anna Maria Ferrero; Gaia Bollini; David Gandreau. 2020. "An SVM-Based Scheme for Automatic Identification of Architectural Line Features and Cracks." Applied Sciences 10, no. 15: 5077.
The economic activities of South Sudan (East-Central Africa) are predominantly agricultural. However, food insecurity due to low agricultural production, connected with weather conditions and lack of water infrastructure and knowledge, is a huge problem. This study reports the results of a qualitative and quantitative investigation of underground and surface water in the area of Gumbo (east of Juba town) that aims to assure sustainable water management, reducing diseases and mortality and guaranteeing access to irrigation and drinking water. The results of the study demonstrate the peculiarity of surface and groundwater and the critical aspects to take into account for the water use, particularly due to the exceeding of limits suggested by the WHO and national regulation. The outcomes provide a contribution to the scientific overview on lithostratigraphic, hydrochemical and hydrogeological setting of a less-studied area, characterized by sociopolitical instability and water scarcity. This represents a first step for the improvement of water knowledge and management, for sustainable economic development and for social progress in this African region.
Manuela Lasagna; Sabrina Bonetto; Laura Debernardi; Domenico De Luca; Carlo Semita; Chiara Caselle. Groundwater Resources Assessment for Sustainable Development in South Sudan. Sustainability 2020, 12, 5580 .
AMA StyleManuela Lasagna, Sabrina Bonetto, Laura Debernardi, Domenico De Luca, Carlo Semita, Chiara Caselle. Groundwater Resources Assessment for Sustainable Development in South Sudan. Sustainability. 2020; 12 (14):5580.
Chicago/Turabian StyleManuela Lasagna; Sabrina Bonetto; Laura Debernardi; Domenico De Luca; Carlo Semita; Chiara Caselle. 2020. "Groundwater Resources Assessment for Sustainable Development in South Sudan." Sustainability 12, no. 14: 5580.
The present study proposes an analytical investigation of the natural resources and social framework of the Hodh el Chargui region (Mauritania), aiming to offer a useful instrument for planning and management to the local authorities. The situation of the region was evaluated by means of a participatory survey carried out among the local inhabitants. The obtained results include a collection of data about population, territorial organization, access to basic education and health services, infrastructure, main economic activities, and natural resources (in terms of water, both surface and groundwater, duration and intensity of rainfalls, soil types, and vegetal resources). The survey outcomes were completed with an integrated approach based on Earth Observation (EO) data supports, such as digital elevation models (DEMs) and Landsat8 imagery. The interdependence among the different data was evaluated and discussed, with regard to the influence of the availability of natural resources on the development of agricultural activities and on the general social welfare. The results are organized in the form of digital maps and a user-friendly webmap platform to facilitate access for all the technical and nontechnical actors involved in the project.
Chiara Caselle; Sabrina Bonetto; Domenico De Luca; Manuela Lasagna; Luigi Perotti; Arianna Bucci; Stefano Bechis. An Interdisciplinary Approach to the Sustainable Management of Territorial Resources in Hodh el Chargui, Mauritania. Sustainability 2020, 12, 5114 .
AMA StyleChiara Caselle, Sabrina Bonetto, Domenico De Luca, Manuela Lasagna, Luigi Perotti, Arianna Bucci, Stefano Bechis. An Interdisciplinary Approach to the Sustainable Management of Territorial Resources in Hodh el Chargui, Mauritania. Sustainability. 2020; 12 (12):5114.
Chicago/Turabian StyleChiara Caselle; Sabrina Bonetto; Domenico De Luca; Manuela Lasagna; Luigi Perotti; Arianna Bucci; Stefano Bechis. 2020. "An Interdisciplinary Approach to the Sustainable Management of Territorial Resources in Hodh el Chargui, Mauritania." Sustainability 12, no. 12: 5114.
When studying rockfall phenomena, a single value of the block volume is not sufficient to take into account the natural variability of the geometrical features (orientation, spacing, persistence) of the discontinuity sets. Different approaches for obtaining cumulative distributions of potentially detachable block volumes are compared. A highly fractured rock mass outcropping along the western Lake Garda (Italy), consisting of prevailing limestone and interbedded marls, is studied in detail from geological and geostructural points of view. Then, a representative rock face has been selected and analyzed with traditional and non-contact survey methods to identify the main discontinuity sets and to collect spacing samples. Based on these data, in situ block size distributions for different combinations of sets are built following statistically-based approaches, without the use of a Discrete Fracture Network (DFN) generator. The validation of the obtained distributions is attempted based on the detached block surveyed at the foot of the slope. However, in this particular case study, the detached blocks cover only a minimal volume range compared to both theoretical values and visible rockfall scars. The fallen rock blocks have a marginal role in design block determination, since their volume depends on geological discontinuities (bedding and fractures) and could be affected by other processes after the detachment (e.g., fragmentation). The procedure here described should be standard practice in the study of rockfall events, and it should be uniform in European standards such as Eurocodes. Future developments should involve the scientific community for setting the percentiles of the probability distribution to be considered for block design definition.
Gessica Umili; Sabrina Maria Rita Bonetto; Pietro Mosca; Federico Vagnon; Anna Maria Ferrero. In Situ Block Size Distribution Aimed at the Choice of the Design Block for Rockfall Barriers Design: A Case Study along Gardesana Road. Geosciences 2020, 10, 223 .
AMA StyleGessica Umili, Sabrina Maria Rita Bonetto, Pietro Mosca, Federico Vagnon, Anna Maria Ferrero. In Situ Block Size Distribution Aimed at the Choice of the Design Block for Rockfall Barriers Design: A Case Study along Gardesana Road. Geosciences. 2020; 10 (6):223.
Chicago/Turabian StyleGessica Umili; Sabrina Maria Rita Bonetto; Pietro Mosca; Federico Vagnon; Anna Maria Ferrero. 2020. "In Situ Block Size Distribution Aimed at the Choice of the Design Block for Rockfall Barriers Design: A Case Study along Gardesana Road." Geosciences 10, no. 6: 223.
Gypsum is a soft rock with low strength and high propensity to plastic deformation. Its mechanical properties are relevant in a wide range of technical application (e.g. tunnel excavation, stability assessment of underground quarries, oil and gas accumulation). The micro-mechanisms involved in the deformation of gypsum rock have for long time interested the scientific world and are still not completely understood. The peculiar crystallographic structure of this bi-hydrate salt, with water molecules layered in the salt structure, favours the development of plastic structures in the rock. The present work proposes an experimental investigation of strain accommodation mechanisms in gypsum rock, reporting data referred to uniaxial and triaxial stress conditions. The rock strain was studied with a multiscale approach, with the comparison of results from DIC and microstructural analyses.
Chiara Caselle; Sabrina Maria Rita Bonetto; Daniele Costanzo. Crack coalescence and strain accommodation in gypsum rock. Frattura ed Integrità Strutturale 2020, 14, 247 -255.
AMA StyleChiara Caselle, Sabrina Maria Rita Bonetto, Daniele Costanzo. Crack coalescence and strain accommodation in gypsum rock. Frattura ed Integrità Strutturale. 2020; 14 (52):247-255.
Chicago/Turabian StyleChiara Caselle; Sabrina Maria Rita Bonetto; Daniele Costanzo. 2020. "Crack coalescence and strain accommodation in gypsum rock." Frattura ed Integrità Strutturale 14, no. 52: 247-255.
The use of non-contact-techniques for rock mass characterization has been growing significantly over the last decade. However, their application to stability assessment of ornamental stone has not yet received much attention from researchers. This study utilizes rock mass data both in terms of slope orientations and degree of fracturing obtained from a point cloud, a set of three-dimensional (3D) points representing a rock mass surface, to (1) investigate the influence of geostructures at different scales and (2) assess quarry stability by determining areas susceptible to different failure types. Multi-resolution point clouds are obtained through several photogrammetric survey techniques to identify important structural elements of the site. By integrating orientation data of discontinuity planes, obtained with a traditional survey, and of traces, outlined on point clouds, several joint sets were identified. Kinematic tests revealed various potential failure modes of the rock slope. Moreover, an analysis of the influence of the discontinuity strength determined by the presence of rock bridges was carried out. The study revealed that the strength of the quarry face is governed by the presence of rock bridges that act to improve the stability condition of the rock fronts.
Sabrina Bonetto; Gessica Umili; Anna Maria Ferrero; Rodolfo Carosi; Matteo Simonetti; Alessandro Biasi; Maria Rita Migliazza; Stefano Bianchini. Geostructural and Geomechanical Study of the Piastrone Quarry (Seravezza, Italy) Supported by Photogrammetry to Assess Failure Mode. Geosciences 2020, 10, 64 .
AMA StyleSabrina Bonetto, Gessica Umili, Anna Maria Ferrero, Rodolfo Carosi, Matteo Simonetti, Alessandro Biasi, Maria Rita Migliazza, Stefano Bianchini. Geostructural and Geomechanical Study of the Piastrone Quarry (Seravezza, Italy) Supported by Photogrammetry to Assess Failure Mode. Geosciences. 2020; 10 (2):64.
Chicago/Turabian StyleSabrina Bonetto; Gessica Umili; Anna Maria Ferrero; Rodolfo Carosi; Matteo Simonetti; Alessandro Biasi; Maria Rita Migliazza; Stefano Bianchini. 2020. "Geostructural and Geomechanical Study of the Piastrone Quarry (Seravezza, Italy) Supported by Photogrammetry to Assess Failure Mode." Geosciences 10, no. 2: 64.
The exploitation of gypsum by both open pit and underground quarries requires attentive evaluations of mechanical features and variability. However, gypsum rock testing often neglects the natural heterogeneity. The result is an inaccurate mechanical characterization that averages the strength values of different materials leading to an underestimation or the overestimation of the stability conditions, without offering a real representation of the mechanical behaviour of the rock. Grain-size, grain-sorting, mineral composition and porosity significantly influence gypsum mechanical behaviour. The individuation of textural and compositional features that primarily influence the variation in mechanical parameters may offer an interpretation key of the phenomenon. In this study, the relation between features at the microscale and macro-mechanical behaviour of gypsum rock was analysed with a multiscale approach. Relationships between Uniaxial Compression Strength (UCS), grain-size distribution and porosity were analysed and discussed. Microscopic observations on thin sections were performed, developing an image analysis procedure for correlating textural and structural parameters with UCS.
C. Caselle; S. Bonetto; F. Vagnon; D. Costanzo. Dependence of macro mechanical behaviour of gypsum on micro-scale grain-size distribution. Géotechnique Letters 2019, 9, 290 -298.
AMA StyleC. Caselle, S. Bonetto, F. Vagnon, D. Costanzo. Dependence of macro mechanical behaviour of gypsum on micro-scale grain-size distribution. Géotechnique Letters. 2019; 9 (4):290-298.
Chicago/Turabian StyleC. Caselle; S. Bonetto; F. Vagnon; D. Costanzo. 2019. "Dependence of macro mechanical behaviour of gypsum on micro-scale grain-size distribution." Géotechnique Letters 9, no. 4: 290-298.
The investigation and prediction of geological anomalies in underground quarries is fundamental to ensure safety, efficiency and economic convenience of the exploitation. For these aims, non-destructive geophysical surveys may be an effective alternative approach to classical destructive prospecting techniques (i.e. horizontal drilling), with great advantages particularly in complex geological frameworks and in areas subjected to specific geo-hazards. Ground Penetrating Radar (GPR), for its high resolution, is a suitable technique for underground excavations, particularly for the identification of water bodies, fissures and fractured rocks. The present study is focused on the application of GPR for the prediction of karst structures in underground gypsum quarries. Karst phenomenon is a main risk factor for gypsum orebodies, where large cavities may be intersected by the excavation. The possible filling with clay or pressurized water of these cavities exponentially increases the dangerousness of the phenomenon, due to swelling problems and violent water inrushes. The aim of the present study is to propose, through modelling and field surveys, a description of GPR outputs for principal elements of karst hazard in gypsum bodies, with particular attention to the discrimination of fillings (air, water or clay).
Chiara Caselle; Sabrina Bonetto; Cesare Comina; Stefano Stocco. GPR surveys for the prevention of karst risk in underground gypsum quarries. Tunnelling and Underground Space Technology 2019, 95, 103137 .
AMA StyleChiara Caselle, Sabrina Bonetto, Cesare Comina, Stefano Stocco. GPR surveys for the prevention of karst risk in underground gypsum quarries. Tunnelling and Underground Space Technology. 2019; 95 ():103137.
Chicago/Turabian StyleChiara Caselle; Sabrina Bonetto; Cesare Comina; Stefano Stocco. 2019. "GPR surveys for the prevention of karst risk in underground gypsum quarries." Tunnelling and Underground Space Technology 95, no. : 103137.
C. Caselle; G. Umili; S. Bonetto; A. M. Ferrero. Application of DIC analysis method to the study of failure initiation in gypsum rocks. Géotechnique Letters 2019, 9, 35 -45.
AMA StyleC. Caselle, G. Umili, S. Bonetto, A. M. Ferrero. Application of DIC analysis method to the study of failure initiation in gypsum rocks. Géotechnique Letters. 2019; 9 (1):35-45.
Chicago/Turabian StyleC. Caselle; G. Umili; S. Bonetto; A. M. Ferrero. 2019. "Application of DIC analysis method to the study of failure initiation in gypsum rocks." Géotechnique Letters 9, no. 1: 35-45.
In this study, a semi-automatic approach implemented in the code CurvaTool has been applied to the analysis of the structural asset and its potential relationship with local water distribution in an area of the central sector of the Main Ethiopian Rift Valley. A 30 m SRTM DEM was used as input for CurvaTool code. A first processing was performed over the whole area (about 10,640 km2). Subsequently, a second processing was carried out over a smaller portion of the original DEM, in order to analyze in detail its morphological and structural features. CurvaTool output data show three main linear feature sets, characterized by non-homogeneous distributions, which have been validated by morphological and geological literature data. Concerning the hydrogeological framework, the analysis of water points distribution shows alignments coherent with the trends of linear features extracted by CurvaTool. This correspondence might suggest a structural control on the groundwater flow paths of the analyzed area and highlight the utility of the semi-automatic CurvaTool approach in the preliminary phase of an hydrogeological study in areas where groundwater flow is conditioned by topography and morphotectonic asset, particularly in case of fractured basement aquifer systems in region with lack of geological information or reduced accessibility.
Sabrina Bonetto; Anna Facello; Gessica Umili. The contribution of CurvaTool semi-automatic approach in structural and groundwater investigations. A case study in the Main Ethiopian Rift Valley. The Egyptian Journal of Remote Sensing and Space Science 2018, 23, 97 -111.
AMA StyleSabrina Bonetto, Anna Facello, Gessica Umili. The contribution of CurvaTool semi-automatic approach in structural and groundwater investigations. A case study in the Main Ethiopian Rift Valley. The Egyptian Journal of Remote Sensing and Space Science. 2018; 23 (1):97-111.
Chicago/Turabian StyleSabrina Bonetto; Anna Facello; Gessica Umili. 2018. "The contribution of CurvaTool semi-automatic approach in structural and groundwater investigations. A case study in the Main Ethiopian Rift Valley." The Egyptian Journal of Remote Sensing and Space Science 23, no. 1: 97-111.
Gessica Umili; Sabrina Bonetto; Anna María Ferrero. An integrated multiscale approach for characterization of rock masses subjected to tunnel excavation. Journal of Rock Mechanics and Geotechnical Engineering 2018, 10, 513 -522.
AMA StyleGessica Umili, Sabrina Bonetto, Anna María Ferrero. An integrated multiscale approach for characterization of rock masses subjected to tunnel excavation. Journal of Rock Mechanics and Geotechnical Engineering. 2018; 10 (3):513-522.
Chicago/Turabian StyleGessica Umili; Sabrina Bonetto; Anna María Ferrero. 2018. "An integrated multiscale approach for characterization of rock masses subjected to tunnel excavation." Journal of Rock Mechanics and Geotechnical Engineering 10, no. 3: 513-522.
A case study on the use of direct and indirect investigations for the effectiveness evaluation of jet-grouting interventions for bridge scour protection is presented. The major concern of this scour countermeasure is that a reliable verification and imaging of the exact dimensions and shape of the grouted elements and their related strength and integrity are difficult to obtain. An integrated cost-effective and slightly invasive approach, by means of indirect surveys, is proposed in this work to limit re-drilling and core sampling of jet columns. Tests are performed on a bridge located in the Province of Cuneo (NW Italy). On site, active fluvial activity was scouring four of the 19 bridge piers and jet-grouting interventions were designed to prevent bridge collapse. A dual approach was consequently applied to evaluate the goodness of jet-grouting treatments: results of direct tests (visual and mechanical characterization of core drillings, with Point Load and Uniaxial Compressive Strength tests) have been compared to indirect investigations (seismic down-hole tests and 2-D cross-hole tomography, laboratory Ultrasonic Pulse Velocity measurements). All the techniques showed potentiality in identifying variations of the jet-grouting properties within the columns. Generally, worsening in jet-grouting properties was coherently identified by a decrease in the seismic velocities and in the mechanical parameters and confirmed by visual inspection of core drillings. Local anomalies and discrepancies between the adopted method were however highlighted and critically discussed as a function of the limitations, disturbances and investigated volumes of each method.
Sabrina Bonetto; Chiara Colombero; Cesare Comina; Nicolò Giordano; Andrea Giuliani; Giuseppe Mandrone; Simone Nicola; Paolo Tible. A case study on the application of destructive and non-destructive methods for evaluating jet-grouting column integrity for bridge-pier scour protection (Cuneo, NW Italy). Bulletin of Engineering Geology and the Environment 2018, 77, 541 -553.
AMA StyleSabrina Bonetto, Chiara Colombero, Cesare Comina, Nicolò Giordano, Andrea Giuliani, Giuseppe Mandrone, Simone Nicola, Paolo Tible. A case study on the application of destructive and non-destructive methods for evaluating jet-grouting column integrity for bridge-pier scour protection (Cuneo, NW Italy). Bulletin of Engineering Geology and the Environment. 2018; 77 (2):541-553.
Chicago/Turabian StyleSabrina Bonetto; Chiara Colombero; Cesare Comina; Nicolò Giordano; Andrea Giuliani; Giuseppe Mandrone; Simone Nicola; Paolo Tible. 2018. "A case study on the application of destructive and non-destructive methods for evaluating jet-grouting column integrity for bridge-pier scour protection (Cuneo, NW Italy)." Bulletin of Engineering Geology and the Environment 77, no. 2: 541-553.
In the past years, lineament analysis has become an important analytical technique for delineation of major structural units in mineral prospecting, hydrogeology, and tectonic studies. The use of remote sensing, with progressive development of image enhancement techniques, provides an opportunity to produce more reliable and comprehensive lineament maps. In this paper, we propose the application of a semi-automatic approach based on digital terrain models (DTMs) for the extraction of potential lineaments and their detailed validation. We selected an area belonging to the Bagni di Vinadio municipality (Cuneo, NW Italy), which is part of the Argentera Massif (western Alps), as a test site. Data obtained from the code CurvaTool, developed by the authors, are successfully compared with literature information and with lineaments obtained from visual interpretation of remote sensing imagery. The CurvaTool code permits the extraction and classification of a greater number of linear features compared to visual interpretation techniques. The ability to detect features that are not perceptible by visual observation is a strong point of CurvaTool processing. In the test area, CurvaTool output data correlate with visually detected linear features and show a good correlation with regional tectonics and iso-kinematic maps from the literature.
Sabrina Bonetto; Anna Facello; Gessica Umili. A New Application of CurvaTool Semi-Automatic Approach to Qualitatively Detect Geological Lineaments. Environmental and Engineering Geoscience 2017, 23, 179 -190.
AMA StyleSabrina Bonetto, Anna Facello, Gessica Umili. A New Application of CurvaTool Semi-Automatic Approach to Qualitatively Detect Geological Lineaments. Environmental and Engineering Geoscience. 2017; 23 (3):179-190.
Chicago/Turabian StyleSabrina Bonetto; Anna Facello; Gessica Umili. 2017. "A New Application of CurvaTool Semi-Automatic Approach to Qualitatively Detect Geological Lineaments." Environmental and Engineering Geoscience 23, no. 3: 179-190.
The seasonal effects of global warming and water shortages begin to be observed on agricultural production and forecast trends encourage studies on adaptation to climate change. In Niger, West Africa, farmers have always had to cope with irregularity and poor distribution of rainfall. In recent years, a variation in the frequency and duration of rainy season were observed, suddenly affecting a drop in agricultural productions with the resulting food crisis. Therefore, it is necessary to find measures to adapt to the climate variability. This study focus on the Tillabéri region (Niger) where pearl millet is one of the main agricultural product. In the last few years, variations in rainfall distribution and quantity have negatively influenced the yield of the millet crops. A climatic assessment of the region has been verified collecting information from both previous studies and satellite data. Two early improved varieties of pearl millet (SOSAT-C88 and HKP) drought resistant have been distributed to local farmers in 16 pilot areas of the Tillabéri region and the crop yields were compared to those of the local traditional variety cultivated in the same area. The results have identified a significant increase in production, up to 62%, with the improved varieties compared to the local one. These results suggests the possibility of a potential extension, in this region, of improved varieties to mitigate the effects derived by climate change in the agricultural productivity in order to avoid famine and guarantee food security.
Abdourahamane Tankari Dan-Badjo; Halima Oumarou Diadie; Sabrina Maria Rita Bonetto; Carlo Semita; Elena Isotta Cristofori; Anna Facello. Using Improved Varieties of Pearl Millet in Rainfed Agriculture in Response to Climate Change: A Case Study in the Tillabéri Region in Niger. Climate Change Research at Universities 2017, 345 -358.
AMA StyleAbdourahamane Tankari Dan-Badjo, Halima Oumarou Diadie, Sabrina Maria Rita Bonetto, Carlo Semita, Elena Isotta Cristofori, Anna Facello. Using Improved Varieties of Pearl Millet in Rainfed Agriculture in Response to Climate Change: A Case Study in the Tillabéri Region in Niger. Climate Change Research at Universities. 2017; ():345-358.
Chicago/Turabian StyleAbdourahamane Tankari Dan-Badjo; Halima Oumarou Diadie; Sabrina Maria Rita Bonetto; Carlo Semita; Elena Isotta Cristofori; Anna Facello. 2017. "Using Improved Varieties of Pearl Millet in Rainfed Agriculture in Response to Climate Change: A Case Study in the Tillabéri Region in Niger." Climate Change Research at Universities , no. : 345-358.
In several areas of the world, water distribution influences the local development. In the volcano-tectonic depressions of the Main Ethiopian Rift (MER) many perennial rivers and lakes are present and constitute an important resource for agriculture, livestock, fishery, soda abstraction, human health and local ecosystems. This paper focuses on the analysis of the temporal and spatial variations of water surface of the lakes in the central Ethiopian Rift in relations to precipitation climatology, in order to better understand the effective role of the climate in the water resources modification in respect to human factor. This should help to establish correct water management practice and implement integrated water management for the protection of lakes in reason of their impacts on the lifestyles of intended beneficiaries like farmers, fishermen, and domestic water consumers. The employed approach and integrated different satellite data (Landsat and NASA-TRMM) in order to generate a proper database for the analysis of the seasonal movements according to climatological variations.
Sabrina Bonetto; Anna Facello; Elena Isotta Cristofori; Walther Camaro; Alessando Demarchi. An Approach to Use Earth Observation Data as Support to Water Management Issues in the Ethiopian Rift. Climate Change Management 2017, 316, 357 -374.
AMA StyleSabrina Bonetto, Anna Facello, Elena Isotta Cristofori, Walther Camaro, Alessando Demarchi. An Approach to Use Earth Observation Data as Support to Water Management Issues in the Ethiopian Rift. Climate Change Management. 2017; 316 ():357-374.
Chicago/Turabian StyleSabrina Bonetto; Anna Facello; Elena Isotta Cristofori; Walther Camaro; Alessando Demarchi. 2017. "An Approach to Use Earth Observation Data as Support to Water Management Issues in the Ethiopian Rift." Climate Change Management 316, no. : 357-374.