Tidal inlets in the Anthropocene: Geomorphology and benthic habitats of the Chioggia inlet,Venice Lagoon (Italy)     

Stefano Fogarin  Fantina Madricardo  Luca Zaggia  Marco Sigovini  Giacomo Montereale-Gavazzi  Aleksandra Kruss  Giuliano Lorenzetti  Giorgia Manfé  Antonio Petrizzo  Emanuela Molinaroli  Fabio Trincardi 《地球表面变化过程与地形》2019,44(11):2297-2315

  相似文献   

Climate and relief-induced controls on the temporal variability of denudation rates in a granitic upland     

Gerald Raab  Markus Egli  Kevin Norton  Dennis Dahms  Dagmar Brandová  Marcus Christl  Fabio Scarciglia 《地球表面变化过程与地形》2019,44(13):2570-2586

How soil erosion rates evolved over the last about 100 ka and how they relate to environmental and climate variability is largely unknown. This is due to a lack of suitable archives that help to trace this evolution. We determined in situ cosmogenic beryllium-10 (¹⁰Be) along vertical landforms (tors, boulders and scarps) on the Sila Massif to unravel their local exhumation patterns to develop a surface denudation model over millennia. Due to the physical resistance of tors, their rate of exhumation may be used to derive surface and, thus, soil denudation rates over time. We derived soil denudation rates that varied in the range 0–0.40 mm yr^-1. The investigated boulders, however, appear to have experienced repositioning processes about ~20–25 ka bp and were therefore a less reliable archive. The scarps of the Sila upland showed a rapid bedrock exposure within the last 8–15 ka. Overall, the denudation rates increased steadily after 75 ka bp but remained low until about 17 ka bp . The exhumation rates indicate a denudation pulse that occurred about 17–5 ka bp . Since then the rates have continuously decreased. We identify three key factors for these developments – climate, topography and vegetation. Between 75 and 17 ka bp , climate was colder and drier than today. The rapid changes towards warmer and humid conditions at the Pleistocene–Holocene transition apparently increased denudation rates. A denser vegetation cover with time counteracted denudation. Topography also determined the extent of denudation rates in the upland regime. On slopes, denudation rates were generally higher than on planar surfaces. By determining the exhumation rates of tors and scarps, soil erosion rates could be determined over long timescales and be related to topography and particularly to climate. This is key for understanding geomorphic dynamics under current environmental settings and future climate change. © 2019 John Wiley & Sons, Ltd. © 2019 John Wiley & Sons, Ltd.  相似文献   

Impact of vehicles on benthic macrofauna on a subtropical sand beach     

Fabio Cavalca Bom  Leonir André Colling 《Marine Ecology》2020,41(4):e12595

Our study aimed to identify possible relationships between the structure of the benthic macrofauna and the intense use of vehicles in Cassino Beach. Physical changes in the sediment were identified, with high compaction in the sector most affected by the vehicles, especially during the summer. The benthic macrofauna was significantly affected by vehicles, with lower densities observed in the most impacted sector, mainly in the summer, unlike the control sector, where higher densities were observed during the pre-summer and summer. We concluded that the vehicle traffic changes the physical environment of the beach and consequently affects the benthic community in the face of this disturbance. We conclude that the benthic macrofauna is highly impacted by vehicle traffic at Cassino Beach, mainly in the period with the highest traffic, and alternatives are needed for this impact, helping to recover this ecosystem.  相似文献   

Reproducing the assembly of massive galaxies within the hierarchical cosmogony     

Fabio Fontanot  Pierluigi Monaco  Laura Silva  Andrea Grazian 《Monthly notices of the Royal Astronomical Society》2007,382(2):903-914

  相似文献   

Simulations of gaseous disc-embedded planet interaction     

Graeme Lufkin †  Thomas Quinn  James Wadsley  Joachim Stadel  Fabio Governato 《Monthly notices of the Royal Astronomical Society》2004,347(2):421-429

  相似文献   

Intermittency of magnetic turbulence in slow solar wind     

Vincenzo Carbone  Roberto Bruno  Fabio Lepreti 《Planetary and Space Science》2004,52(10):953-956

We investigate the properties of intermittency of magnetic turbulence by using magnetic field data collected by the Helios spacecraft in the inner heliosphere. Clear scaling laws for magnetic structure functions are visible in periods where the velocity of the bulk plasma is low. Within these periods we found that intermittency of magnetic turbulence is high with respect to velocity field. A comparison with fluid flows where passive scalars are more intermittent than velocity, yields to consider the magnetic field like a “passive vector”.  相似文献   

Apparent magnetic polarity reversals due to remagnetization resulting from late diagenetic growth of greigite from siderite     

Leonardo Sagnotti  rew P. Roberts  Richard Weaver  Kenneth L. Verosub  Fabio Florindo  Christopher R. Pike  Trevor Clayton  Gary S. Wilson 《Geophysical Journal International》2005,160(1):89-100

  相似文献   

Stable inverse deconvolution of magnetic data     

Fabio Caratori Tontini 《Geophysical Journal International》2005,162(3):725-735

  相似文献   

Paleomagnetic constraints on the Plio–Pleistocene geodynamic evolution of the external central–northern Apennines (Italy)     

Leonardo Sagnotti  Aldo Winkler  Laura Alfonsi  Fabio Florindo  Fabrizio Marra 《Earth and Planetary Science Letters》2000,180(3-4):243-257

We report on new paleomagnetic results obtained from 27 sites sampled in the Plio–Pleistocene sequences at the external front of the central–northern Apennines. Previous analyses of Miocene (Messinian) sediments indicated that the present shape of the northern Apenninic arc is due to the oroclinal bending of an originally straight belt oriented around N320° and that vertical axis rotations accompanied the migration of the thrust fronts toward the Adriatic foreland [F. Speranza et al., J. Geophys. Res. 102 (1997) 3153–3166]. We tried to provide new paleomagnetic constraints for the timing and rates of the oroclinal bending process during the Pliocene and the Pleistocene. The results suggest that CCW rotations observed in the northern part of the studied area are possibly younger than 3 Ma. No regional rotation is recorded in the Pliocene and Pleistocene sediments from the southern part of the study area, analogously to the Messinian sediments of the ‘Acquasanta’ domain of Speranza et al. [F. Speranza et al., J. Geophys. Res. 102 (1997) 3153–3166]. A local significant CCW rotation (23°±10°) is identified in the Early Pleistocene sediments that crop out along the Adriatic coast between Ascoli and Pescara, indicating differential motion of the thrust sheets. This rotation must be younger than 1.43 Ma.  相似文献   

A generalized Biot–Gassmann model for the acoustic properties of shaley sandstones¹     

José M. Carcione  Boris Gurevich  Fabio Cavallini 《Geophysical Prospecting》2000,48(3):539-557

We obtain the wave velocities of clay-bearing sandstones as a function of clay content, porosity and frequency. Unlike previous theories, based simply on slowness and/or moduli averaging or two-phase models, we use a Biot-type three-phase theory that considers the existence of two solids (sand grains and clay particles) and a fluid. The theory, which is consistent with the critical porosity concept, uses three free parameters that determine the dependence of the dry-rock moduli of the sand and clay matrices as a function of porosity and clay content.
Testing of the model with laboratory data shows good agreement between predictions and measurements. In addition to a rock physics model that can be useful for petrophysical interpretation of wave velocities obtained from well logs and surface seismic data, the model provides the differential equation for computing synthetic seismograms in inhomogeneous media, from the seismic to the ultrasonic frequency bands.  相似文献