196,628 research outputs found
Hydrological year 2007-2008: Meteorogical features for the italian Alps.
No full textIn the reports the following rules and conventions were observed.
The numbers in bold type preceding the name of the glaciers
are those of the «Catasto dei Ghiacciai Italiani» (Inventory of Italian
Glaciers), 4 voll., Comitato Glaciologico Italiano, 1959-1962,
and subsequent variations. The numbers in bold type that countermark
photographs and figures correspond to those of the glacier
inventory. In addition to the subject, the photographic station, the
format of the negative, the focal length of the lens, the date and the
author are also indicated.
The letters, sometime in pairs, between brackets and small,
placed next to the symbols of the signals, have the following meaning:
c, centre; d, right; s, left; f, frontal; l, lateral. The symbols (C),
(T) and (A) indicate that the altitude they refer to, always expressed
in metres, has been respectively derived from the topographical
map, determined topographically or obtained with an altimeter.
In the tables summarising the variations of each glacier the
distances, expressed in metres, are approximated to ±0.5 m and
are intended as real distances. Unless otherwise indicated in
brackets, previous distance means that of the year 2004. Variations
are indicated with the following symbols: – retreat; +
advance; –X not quantifiable retreat; +X not quantifiable advance,
0 stationary glacier; ? uncertain variation; SN snout covered by
residual snow; NM not measured.
The coordinators assume both scientific and editorial responsibility
for all reports in the sectors within their competence
An inverse problem to infer paleo-flow conditions from turbidites
No full textAn inverse problem is here studied to infer paleoflow conditions from turbidites (i.e., from turbidity current deposits). Such a problem is constrained to outcrop data from the Laga Formation (Lower Messianian; central Apennines, Italy). Analytical solutions of layeraveraged governing equations for net depositional turbidity currents flowing over a flat bottom are found. These allow recovering conditions for current velocity, thickness, and sediment concentration at the start of the net deposition by using the analytic solution of the Exner equation for net-depositional turbidity currents. The Exner equation describes the along-current profile of a sedimentary bed deposited by a single depositional event. For lobe deposits of the Laga Formation we obtain values of 1.5 m/s for layer-averaged current velocities, 50–100 m for current thicknesses, and 0.5% for layer-averaged sediment volume concentrations. The duration time of these flows is also computed and gives rather short time span values varying from 1 to 15 h. All of these values are in good agreement with those reported in literature
Termic conditions in the air in the ground and freeze and thaw cycles in the upper Val di Lima (Pistoia Apennines)
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