Papers by Guglielmo Rossi
We set up an early warning system for rainfallinduced
landslides in Tuscany (23 000 km2). The sys... more We set up an early warning system for rainfallinduced
landslides in Tuscany (23 000 km2). The system is
based on a set of state-of-the-art intensity–duration rainfall
thresholds (Segoni et al., 2014b) and makes use of LAMI
(Limited Area Model Italy) rainfall forecasts and real-time
rainfall data provided by an automated network of more than
300 rain gauges.
The system was implemented in a WebGIS to ease the operational
use in civil protection procedures: it is simple and
intuitive to consult, and it provides different outputs. When
switching among different views, the system is able to focus
both on monitoring of real-time data and on forecasting
at different lead times up to 48 h. Moreover, the system can
switch between a basic data view where a synoptic scenario
of the hazard can be shown all over the region and a more
in-depth view were the rainfall path of rain gauges can be
displayed and constantly compared with rainfall thresholds.
To better account for the variability of the geomorphological
and meteorological settings encountered in Tuscany, the
region is subdivided into 25 alert zones, each provided with a
specific threshold. The warning system reflects this subdivision:
using a network of more than 300 rain gauges, it allows
for the monitoring of each alert zone separately so that warnings
can be issued independently. An important feature of the warning system is that the visualization
of the thresholds in the WebGIS interface may
vary in time depending on when the starting time of the rainfall
event is set. The starting time of the rainfall event is considered
as a variable by the early warning system: whenever
new rainfall data are available, a recursive algorithm identifies
the starting time for which the rainfall path is closest
to or overcomes the threshold. This is considered the most hazardous condition, and it is displayed by the WebGIS interface.
The early warning system is used to forecast and monitor
the landslide hazard in the whole region, providing specific
alert levels for 25 distinct alert zones. In addition, the system
can be used to gather, analyze, display, explore, interpret and
store rainfall data, thus representing a potential support to
both decision makers and scientists.
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In this paper, the updating of rainfall thresholds for landslide early warning
systems (EWSs) is ... more In this paper, the updating of rainfall thresholds for landslide early warning
systems (EWSs) is presented. Rainfall thresholds are widely used in regional-scale landslide
EWSs, but the efficiency of those systems can decrease during the time, so a periodically
updating should be required to keep their functionality. The updating of 12 of the
25 thresholds used in the EWS of Tuscany region (central Italy) is presented, and a
comparison between performances of new and previous thresholds has been made to
highlight the need of their periodical update. The updating has been carried out by collecting
ca. 1200 new landslide reports (from 2010 to March 2013) and their respective
rainfall data, collected by 332 rain gauges. The comparison has been made by the use of
several statistical indexes and showed a marked increasing in the performances of the new
thresholds with respect to previous ones.
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Papers by Guglielmo Rossi
landslides in Tuscany (23 000 km2). The system is
based on a set of state-of-the-art intensity–duration rainfall
thresholds (Segoni et al., 2014b) and makes use of LAMI
(Limited Area Model Italy) rainfall forecasts and real-time
rainfall data provided by an automated network of more than
300 rain gauges.
The system was implemented in a WebGIS to ease the operational
use in civil protection procedures: it is simple and
intuitive to consult, and it provides different outputs. When
switching among different views, the system is able to focus
both on monitoring of real-time data and on forecasting
at different lead times up to 48 h. Moreover, the system can
switch between a basic data view where a synoptic scenario
of the hazard can be shown all over the region and a more
in-depth view were the rainfall path of rain gauges can be
displayed and constantly compared with rainfall thresholds.
To better account for the variability of the geomorphological
and meteorological settings encountered in Tuscany, the
region is subdivided into 25 alert zones, each provided with a
specific threshold. The warning system reflects this subdivision:
using a network of more than 300 rain gauges, it allows
for the monitoring of each alert zone separately so that warnings
can be issued independently. An important feature of the warning system is that the visualization
of the thresholds in the WebGIS interface may
vary in time depending on when the starting time of the rainfall
event is set. The starting time of the rainfall event is considered
as a variable by the early warning system: whenever
new rainfall data are available, a recursive algorithm identifies
the starting time for which the rainfall path is closest
to or overcomes the threshold. This is considered the most hazardous condition, and it is displayed by the WebGIS interface.
The early warning system is used to forecast and monitor
the landslide hazard in the whole region, providing specific
alert levels for 25 distinct alert zones. In addition, the system
can be used to gather, analyze, display, explore, interpret and
store rainfall data, thus representing a potential support to
both decision makers and scientists.
systems (EWSs) is presented. Rainfall thresholds are widely used in regional-scale landslide
EWSs, but the efficiency of those systems can decrease during the time, so a periodically
updating should be required to keep their functionality. The updating of 12 of the
25 thresholds used in the EWS of Tuscany region (central Italy) is presented, and a
comparison between performances of new and previous thresholds has been made to
highlight the need of their periodical update. The updating has been carried out by collecting
ca. 1200 new landslide reports (from 2010 to March 2013) and their respective
rainfall data, collected by 332 rain gauges. The comparison has been made by the use of
several statistical indexes and showed a marked increasing in the performances of the new
thresholds with respect to previous ones.
landslides in Tuscany (23 000 km2). The system is
based on a set of state-of-the-art intensity–duration rainfall
thresholds (Segoni et al., 2014b) and makes use of LAMI
(Limited Area Model Italy) rainfall forecasts and real-time
rainfall data provided by an automated network of more than
300 rain gauges.
The system was implemented in a WebGIS to ease the operational
use in civil protection procedures: it is simple and
intuitive to consult, and it provides different outputs. When
switching among different views, the system is able to focus
both on monitoring of real-time data and on forecasting
at different lead times up to 48 h. Moreover, the system can
switch between a basic data view where a synoptic scenario
of the hazard can be shown all over the region and a more
in-depth view were the rainfall path of rain gauges can be
displayed and constantly compared with rainfall thresholds.
To better account for the variability of the geomorphological
and meteorological settings encountered in Tuscany, the
region is subdivided into 25 alert zones, each provided with a
specific threshold. The warning system reflects this subdivision:
using a network of more than 300 rain gauges, it allows
for the monitoring of each alert zone separately so that warnings
can be issued independently. An important feature of the warning system is that the visualization
of the thresholds in the WebGIS interface may
vary in time depending on when the starting time of the rainfall
event is set. The starting time of the rainfall event is considered
as a variable by the early warning system: whenever
new rainfall data are available, a recursive algorithm identifies
the starting time for which the rainfall path is closest
to or overcomes the threshold. This is considered the most hazardous condition, and it is displayed by the WebGIS interface.
The early warning system is used to forecast and monitor
the landslide hazard in the whole region, providing specific
alert levels for 25 distinct alert zones. In addition, the system
can be used to gather, analyze, display, explore, interpret and
store rainfall data, thus representing a potential support to
both decision makers and scientists.
systems (EWSs) is presented. Rainfall thresholds are widely used in regional-scale landslide
EWSs, but the efficiency of those systems can decrease during the time, so a periodically
updating should be required to keep their functionality. The updating of 12 of the
25 thresholds used in the EWS of Tuscany region (central Italy) is presented, and a
comparison between performances of new and previous thresholds has been made to
highlight the need of their periodical update. The updating has been carried out by collecting
ca. 1200 new landslide reports (from 2010 to March 2013) and their respective
rainfall data, collected by 332 rain gauges. The comparison has been made by the use of
several statistical indexes and showed a marked increasing in the performances of the new
thresholds with respect to previous ones.