DSpace Community: 03.02. Hydrology

GPS sensitivity analysis applied to non-permanent deformation control networks

Title: GPS sensitivity analysis applied to non-permanent deformation control networks

Authors: Betti, B.; DIIAR Politecnico di Milano; Biagi, L.; Polo di Como Politecnico di Milano; Crespi, M; DITS Università La Sapienza Roma; Riguzzi, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia

Abstract: This paper illustrates the surveys and the results obtained in an experiment whose goal is to evaluate the Global Positioning System (GPS) sensitivity and accuracy for deformation control on non-permanent network of di fferent extensions. To this aim a high-precision device was properly built to set up known displacements along three orthogonal axes of a GPS antenna. One of the antennas in the considered GPS networks was moved according to centimeter and sub-centimeter displacements; after careful GPS data pro- cessing, it was evaluated whether these simulated deformations were correctly a posteriori detected and at which probability level. This experiment was carried out both on a local (baselines ranging between 3 and 30 km)and on a regional (baselines ranging between 300 and 600 km) GPS network. The results show that in the local network it is possible to identify the displacements at a level of 10 mm in height and at a level of 5 mm in horizontal position. The analysis of the regional network showed that it is fundamental to investigate new strategies to model the troposphere; in fact, it is necessary to improve the precision of the height in order to correctly identify displacements lower than 60± 80 mm; on the contrary, horizontal displacements can be evidenced at the level of 20 mm.

A preliminary analysis of in situ and remotely sensed environmental variables in the coastal region of the Portofino Marine Protected Area

Title: A preliminary analysis of in situ and remotely sensed environmental variables in the coastal region of the Portofino Marine Protected Area

Authors: Manca Zeichen, M.; Central Institute for Marine Research, Rome; Finoia, M. G.; Central Institute for Marine Research, Rome; Locritani, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Ruggieri, N.; University of Genoa; Tunesi, L.; Central Institute for Marine Research, Rome; Gasparini, G. P.; CNR ISMAR; Bassetti, M.; ETD Dept., NURC; Grandi, V.; ETD Dept., NURC; Cattaneo-Vietti, R.; University of Genoa; Povero, P.; University of Genoa

Abstract: Coastal marine environment is a complex system and its management requires adequate information. Marine Protected Areas (MPAs) are considered pilot sites useful to define innovative tools for the Integrated Coastal Zone Management (ICZM). Their management however requires acquaintance with the relationships between the protected site and the status of the coastal neighbouring areas in order to assess mutual effects and influences. There is the need of monitoring systems capable of highlighting physical and biological phenomena, and possible oceanographic anomalies at local scale, to assess possible existing differences between MPAs and their neighbouring unprotected zones. The present study proposes an integrated analysis of data sets coming from in situ and remote-sensing data to evaluate the reliability of satellite sensors for coastal zone monitoring and to better understand the short-term environmental dynamics on a coastal area centred on the Portofino MPA (Ligurian Sea).

GEOCHEMICAL CHARACTERIZATION OF THERMAL AND COLD GROUNDWATERS OF METHANA PENINSULA (PELOPONNESUS, GREECE)

Title: GEOCHEMICAL CHARACTERIZATION OF THERMAL AND COLD GROUNDWATERS OF METHANA PENINSULA (PELOPONNESUS, GREECE)

Authors: D'Alessandro, W.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; Brusca, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; Kyriakopoulos, K.; University of Athens, Dept. Geology and Geoenvironment; Bellomo, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; Michas, G.; University of Athens, Dept. Geology and Geoenvironment; Papadakis, G.; University of Athens, Dept. Geology and Geoenvironment

Editors: Migiros, G.; Agricultural University of Athens, Dept: Sciences; Stamatis, G.; Agricultural University of Athens, Dept: Sciences; Stournaras, G.; University of Athens, Dept. of Geology and Geoenvironment

Abstract: A comprehensive hydrogeochemical study of the cold and thermal groundwaters of the presently quiescent volcanic system of Methana was undertaken collecting 59 natural water samples during the period 2004-2007. Methana is a peninsula whose climatology and hydrology can be compared to the nearby small islands of the Aegean Sea. Similarly the chemical and isotopic composition of its water is dominated by the mixing of seawater with meteoric water. But the simple mixing trend is modified by water-rock interaction processes, enhanced by the dissolution of endogenous CO2, leading to strong enrichments in Alkalinity, Calcium, Barium, Iron and Manganese.

GEOCHEMICAL CHARACTERIZATION OF THERMAL AND COLD GROUNDWATERS OF METHANA PENINSULA (PELOPONNESUS, GREECE)