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Di Maio, Antonia
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Di Maio, Antonia
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- PublicationOpen AccessImpact of Freshwater Inflow From the Volturno River on Coastal Circulation(2020-06-03)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The coastal area located in front of the Volturno river estuary (the Gulf of Gaeta, central-eastern Tyrrhenian Sea) was synoptically sampled in seven surveys between June 2012 and October 2014. Vertical profiles of temperature and salinity were acquired on a high-resolution nearly-regular grid in order to describe the spatial and temporal variability of the characteristics of the waters. Moreover, the three-dimensional velocity field associated with each survey was computed through the full momentum equations of the Princeton Ocean Model to provide a first assessment of the steady-state circulation at small scale. The data analysis shows the entire water column to be characterized by an evident thermal cycle and a vertical thermohaline structure, dominated by three types of waters: the freshwater of the river, the saltier coastal Tyrrhenian waters, and transitional waters originating from their mixing. The inflow of freshwater strongly affects the density distribution, leading to strong temporal variability in the upper layer. Its impact is more evident in winter, sometimes inducing a vertical temperature inversion. In case of rainy events, and also in conditions of high vertical temperature stratification, it forms a surface-trapped layer with high density gradients. These and wind forcing contribute to the formation of small-scale shallow features, such as longshore currents and cyclonic and anticyclonic eddies. The latter influence the vertical stratification and modify the coastal circulation, preserving the transitional waters from the surrounding saltier ones.233 23 - PublicationRestrictedDesign and test of a laser-based optical-fiber Bragg-grating accelerometer for seismic applications(2008)
; ; ; ; ; ; ; ; ;Gagliardi, G.; CNR-Istituto Nazionale di Ottica Applicata, Sezione di Napoli, Comprensorio ‘A Olivetti’, Italy ;Salza, M.; CNR-Istituto Nazionale di Ottica Applicata, Sezione di Napoli, Comprensorio ‘A Olivetti’, Italy ;Ferraro, P.; CNR-Istituto Nazionale di Ottica Applicata, Sezione di Napoli, Comprensorio ‘A Olivetti’, Italy ;De Natale, P.; CNR-Istituto Nazionale di Ottica Applicata, Sezione di Napoli, Comprensorio ‘A Olivetti’, Italy ;Di Maio, A.; Ansaldo STS, Napoli, Italy ;Carlino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;De Natale, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Boschi, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia; ; ; ; ; ; ; We report on a proof-of-principle work aimed at the development of fast-response fiber-optic accelerometers for seismic monitoring. The system is based on a semiconductor diode-laser source that interrogates a newly devised two-dimensional inertial sensor suitable for measurement of horizontal ground accelerations. Plane acceleration components of the sensor’s mass are detected by two fiber Bragg gratings anchored to its structure. Calibration and comparison with a commercial accelerometer are presented. A great potential, in terms of frequency response and sensitivity, is demonstrated in view of possible field applications in active seismic areas.403 49