1,721,081 research outputs found
The October 2000 flooding in Valle d'Aosta (Italy): Event description and land planning measures for the risk mitigation
Full text linkOn October 13-16th, 2000 heavy rainfalls in the Northwestern Italian Alps caused huge flooding and landslides with significant damages to houses and infrastructures and several life losses. In this paper a description of the main events that affected Valle d’Aosta’s region and the subsequent land planning measures adopted for the risk mitigation are presented. After a first meteorological and hydrological framing, based on the data of the regional monitoring system (that pointed out rainfalls up to 236 mm in 24 h also in high‐altitude zones, because of the rise of the isotherm 0°C around 3000 m above sea level), the main effects of the event (extensive flooding, landslides, soil slips and debris flows) in the regional catchment of the Dora Baltea river are described. Through aerial and direct surveys those effects have been transferred into a thematic cartography within two months from the event, in order to have detailed elements for the technical, administrative and political land planning decisions, and, on this basis, a new regional directive containing detailed measures for the hydro‐geological risk mitigation and land safety has been adopted. © 2003 by Taylor nad Francis Group, LLC
Multicriteria Analysis for the Assessment of Flow Release Scenarios from a Hydropower Plant in the Alpine Region
Full text linkThe Alpine region is an area of conflict between the significant demand for hydropower (HP) generation and the protection of landscape and aquatic ecosystems. Decision Support Systems, like multicriteria analysis (MCA), represent suitable tools to support decision-makers and stakeholders in managing the use of water resources in a more sustainable way. Based on a set of “quality indexes” identified in a previous study, the present paper analyzes the use of MCA in a real case study of HP sustainable management in Aosta Valley, one of the most important Italian regions for HP production. The Simple Additive Weighting (SAW) methodology was applied to quantify the flow to be released by an existing HP plant, in order to balance production needs and watercourse environmental conditions protection considering four criteria (Energy, Environment & Fishing, Landscape, and Economy). The decisional process was developed within a collaborative and participatory framework, involving key stakeholders in every decision-making step, and the obtained results were officially adopted by the Regional Government. In the paper, some innovative aspects of the case study are presented and discussed, like the elaboration of reactive indicators related to the watercourse discharge, progressively updated with the stakeholders along the process, and the definition of “real-time” alternatives, relating the flow releases to the natural discharges in the watercourse. Finally, some weaknesses of this MCA approach are identified and suggestions for improvements in future experimentations are proposed
Guidelines for the initial environmental review (CEE Regulation 1836/93 - EMAS) of hydropower plants.
No full textRiver water abstraction environmental compatibility in new projects authorization and existing sites management
No full textLinee guida per la predisposizione dei dossier di compatibilità ambientale dei prelievi idrici da corsi d'acqua naturali
No full textGUIDELINES FOR WATER POTABILISATION PLANTS INITIAL ENVIRONMENTAL REVIEW (EMAS Council Regulation EEC N.1836/93)
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Commento agli articoli 405 e 406 c.p.c.
No full textL'evoluzione storica e la funzione delle prescrizioni che regolano la domanda e il procedimento di opposizione di terzo nel codice di procedura civile. L'analisi dettagliata delle singole proposizioni normative che compongono gli articoli 405 e 406, c.p.c
Opportunità dell'applicazione del Regolamento CE 761/2001 EMAS al settore estrattivo delle pietre ornamentali
No full textIndividual activity levels and presence of conspecifics affect fish passage rates over an in-flume barrier
Full text linkDams and other in-stream obstacles disrupt longitudinal connectivity and hinder fish from moving between habitats. Fishways and other fish passage solutions are used to pass fish over these artificial migration barriers. Fish passage functionality, however, varies greatly with fish passage design and environmental conditions and depends on fish species and characteristics. In particular, swimming performance and fish behaviour are considered key characteristics to predict fish passage performance. It is also well known, but not well quantified, that the presence of conspecifics affects fish passage behaviour. In this study, we quantified individual passage rates of PIT-tagged gudgeons (Gobio gobio) over a scaled deep side notch weir in an hydraulic flume. We then quantified individual swimming capability (time to fatigue) and activity level (distance moved in an open field test) for the same individual fish and tested for potential effects on fish passage rate. To check for potential group effects, we then repeated the passage experiment for fish individually or in groups of five. More active fish displayed higher passage rates compared to less active fish, and fish passed the obstacle at higher rates in groups of five compared to alone. No effect of fish swimming capability on passage rates was detected. This result highlights the need to take both individual variation as well as the presence and behaviour of conspecifics into account in fish passage studies and evaluations. Doing so has the potential to improve the understanding of fish behaviour, and in the end, the design of fish passage solutions. Future studies should explore these results on free ranging fish and in relation to in-situ fish passage solutions
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