237 research outputs found
On the displacement of marked pebbles on two coarse-grained beaches during short fair-weather periods (Marina di Pisa and Portonovo, Italy)
No full textThe transport of particles along a shore is a paramount process when it comes to the
evolution of a coastal environment. Factors affecting sediment displacement lead the
morphodynamics of a given beach towards a state of erosion, equilibrium or expansion. A
proper management of a littoral area cannot set aside an insight awareness of the influence
that the processes acting on the nearshore exert on the sediments the beaches are composed
of. For this reason particle transport is a topic that has been widely addressed in the scientific
literature especially for sandy beaches (White, 1998; Ciavola, 2004). Only recently sediment
movement on coarse-grained beaches has been matter of several research studies (Allan et al.,
2006; Curtiss et al., 2009; Bertoni et al., 2012): scientific productivity on this environment
increased mostly because of new technical solutions that solved many of the logistic
problems encountered previously (Buscombe and Masselink, 2006; Bertoni et al., 2010). For
instance, the chance to track individual pebbles by means of the RFID (Radio Frequency
Identification) technique provided a major boost towards the definition of coarse sediments
displacement on coarse-grained beaches (Allan et al., 2006; Bertoni et al., 2010). In addition,
the use of gravel and pebble beaches as a form of coastal protection has progressively
increased lately, because they are more resistant to wave action rather than sandy beaches.
Thus, improving the knowledge about this environment is of great significance also to
optimize future projects involving the construction of artificial coarse-grained beaches
Sport estetici ed atlete: composizione corporea, disturbi alimentari e mestruali.
No full textOver the last decades, the sharp raise in performance levels strictly related to competitive sport has implied a serious consequence. That is, a steady increase in athletes’ physical engagement required to obtain such high-level performances. This trend should be taken into account and, therefore, never undervaluated. As a matter of fact, there are growing concerns regarding the effective athletes health status. In particular, the so called “aesthetic sports” are principally considered as responsible for the above mentioned practices because they place heavy emphasis on body appearance. The latter seems to be involved in such agonistic disciplines. It is not by change, moreover, if also some specific anthropometrical features are clearly and obligatorily required to achieve such satisfying performance results. This complex topic may be tackled from different angles. Taking every consideration into account, the present study is aimed at representing a more specific review in literary production concerning intensive training related to the above-quoted aesthetic and anthropometrical characteristics.
On the one hand, the achievement as well as the maintenance of these features are considered nearly essential peculiarities nowadays; on the other hand, such perfection requested could also determine some health risks for engaged athletes, and females above all
Processus de migration des barres intertidales sous l’impact du “swash”. Etudes en Adriatique septentrionale.
No full text
Short term pebble displacement on a mixed sand and gravel beach on the Adriatic Sea (Portonovo, Italy)
No full textThe transport of marked pebbles on a mixed sand and gravel beach has been addressed by means of tracers using radio
frequency identification tracing technique, which proved to be efficient in terms of recovery rate also in the underwater
environment. The aim of the research was to evaluate the displacement rates of marked pebbles at short time spans and
under low energy wave conditions. The experiment was carried out at Portonovo beach, central Adriatic Sea (Italy), on
29-30 March 2012. Two recovery campaigns were carried out respectively 6 and 24 hours after the injection.. During
the time frame of the experiment wave motion was minimum (wave height never exceeded 0.2 m). The results showed
that pebbles of about 30 to 90 mm diameter did move significantly (more than 0.5 m) already 6 hours after the injection
(17%). After 24 hours pebble significant displacements reached 39% and pebble loss increased to 7%. The large
majority of tracers moved seaward, pointing out that coarse sediments move under low-energy conditions mainly
because the beachface slope controls swash processes on coarse-clastic beaches. Backswash action contributes to
generate not negligible rate of offshore pebble displacement also under low-energy conditions. In conclusion, the
results of this research confirm that coarse sediment transport during short, fair-weather spans of time, is considerable and it is mostly directed downslope
Preface to special issue: Monitoring and modelling to guide coastal adaptation to extreme storm events in a changing climate
No full textStorms across the globe and their associated consequences in coastal zones (flooding and erosion), combined with the long-term geomorphic evolution of our coastlines, are a threat to life and assets, both socioeconomic and environmental. In a changing climate, with a rising global sea level, potentially changing patterns in storm tracks and storminess, and rising population density and pressures on the coastal zone, the future risk of coastal storm impacts is likely to increase. Coastal managers and policy makers therefore need to make effective and timely decisions on the use of resources for the immediate and longer
Research focused on "monitoring and modelling to guide coastal adaptation to extreme storm events in a changing climate" is becoming more common; its goal is to provide science-based decision support for effective adaptation to the consequences of storm impacts, both now and under future climate scenarios at the coast. The growing transfer of information between the science community and end-users is enabling leading research to have a greater impact on the socioeconomic resilience of coastal communities. This special issue covers recent research activities relating to coastal hazard mapping in response to extreme events, economic impacts of long-term change, coastal processes influencing management decisions and the development of online decision support tools
Natural and man-made coastal change of the Goro spit-lagoon system (Po Delta, Northern Italy)
No full textDetermination of iron isotopes by neutron activation analysis
No full textInstrumental neutron activation analysis has been applied to the determination of Fe isotopic abundances in iron materials with the experimental accuracy of 5%. The proposed method can be considered as a quite simple and fast quality check system on the iron isotope enriched oxides used as standard in Mössbauer spectroscopy. © 1995 Akadémiai Kiadó
Relationship between bar migration and swash duration: field assessments at Lido di Volano beach, Adriatic Sea, Northern Italy
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