Floods are lethal and destructive natural hazards. The Mediterranean, including Greece, has recently experienced many flood events (e.g., Medicanes Zorbas and Ianos), while climate change results in more frequent and intense flood events. Accurate flood mapping in river areas is crucial for flood risk assessment, planning mitigation measures, protecting existing infrastructure, and sustainable planning. The accuracy of results is affected by all simplifying assumptions concerning the conceptual and numerical model implemented and the quality of geospatial data used (Digital Terrain Models—DTMs). The current research investigates flood modelling sensitivity against geospatial data accuracy using the following DTM resolutions in a mountainous river sub-basin of Thessaly’s Water District (Greece): (a) open 5 m and (b) 2 m data from Hellenic Cadastre (HC) and (c) 0.05 m data from an Unmanned Aerial Vehicle (UAV) topographical mission. RAS-Mapper and HEC-RAS are used for 1D (steady state) hydraulic simulation regarding a 1000-year return period. Results include flood maps and cross section-specific flow characteristics. They are analysed in a graphical flood map-based empirical fashion, whereas a statistical analysis based on the correlation matrix and a more sophisticated Machine Learning analysis based on the interpretation of nonlinear relationships between input–output variables support and particularise the conclusions in a quantifiable manner.
The purpose of this paper is to prepare questionnaire-based research proposals by undergraduate students for the Soil Mechanics course of the Dept. Civil Infrastructure Engineering, as well as postgraduate students for the course of Environmental Geotechnics of the Postgraduate Programme "Advanced Environmental Management Technologies in Engineering Works" of the General Department of Larissa of the University of Thessaly, with the ultimate goal being the upgrade of the classes. It is noted that the lecturers of the course participated in the evaluation of the Environmental Geotechnics course through a relevant questionnaire. The research strategy concerns the design of the questionnaire in conjunction with the objectives of the course. According to the curriculum, geotechnical courses aim to enable students to apply the methodologies for calculating the physical characteristics and mechanical properties of the soil, which functions either as a superstructure load recipient or as a structural material for the construction of geotechnical works. The questionnaires took into account the content of each lesson, students' preferences in the learning process, the ability to self-evaluate, evaluate and develop collaborations, the desired number of teaching hours available to cover the subject and the adequacy of the knowledge acquired in each module of the course. Finally, the students' responses were evaluated, and useful conclusions were drawn which could contribute positively to the qualitative improvement of the teaching of the above courses
The stability of slopes and embankments under the influence of static and seismic loads has been the subject of study for many researchers. This paper stands for an attempt to present tolerable move-ments, based on caused damage on slopes of the embankments, as well as to connect them with natural disas-ters of the environment.
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