Publication Date:
2017-04-04
Description:
The paper describes the erosion processes acting at La Fossa cone
(Vulcano Island, Italy). La Fossa cone is a stratovolcano made up of pyroclastic
deposits and lavas covered by tuffs from the last eruption, dated
1888-90. Its flanks are affected by intense water erosion phenomena leading
to the formation of denudation surfaces due to sheet erosion, rills, gullies
and small canyons. As a consequence of very intense rainfalls, episodic
debris flows occur along main gullies and canyons. Fumarolic activity
plays an important role in the control of erosion processes, being both an
obstacle for the growth of vegetation and a weathering factor. The GIS
analysis and comparison of geo-referenced maps and aerial photos highlighted
the influence of man-made structures on erosion processes, with
particular reference to deep modifications in the natural stream network
induced by buildings and roads. The combined effects of volcanic and anthropogenic
activities, together with the additional role played by the
strong inter-annual variability of rainfall amounts and intensities, give rise
to significant changes in water erosion rates. A total volume of 5,700 m3
of volcanic products eroded between the years 1980 and 2008 from the
upper portion of La Fossa cone has been estimated by GIS analysis.
Description:
Published
Description:
89-94
Description:
4.4. Scenari e mitigazione del rischio ambientale
Description:
JCR Journal
Description:
restricted
Keywords:
Anthropogenic activity
;
Erosion processes
;
GIS
;
Volcanic activity
;
Vulcano Island
;
04. Solid Earth::04.04. Geology::04.04.03. Geomorphology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Permalink
