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Archive for the ‘040_2’ Category

040_2_04_2017

maggio 7th, 2018

DOI 10.4461/GFDQ.2017.40.12

RASO E., BRANDOLINI P., FACCINI F., REALINI E., CALDERA S. & FIRPO M.,

Geomorphological evolution and monitoring of San Bernardino-Guvano landslide (Eastern Liguria, Italy).

Pages 197-210

Abstract

The San Bernardino-Guvano landslide is one of the wider slope mass movements located along the eastern Ligurian coast between Vernazza and Corniglia, Cinque Terre National Park. It is an ancient and complex landslide that has been studied since 1853, when a catastrophic event occurred. This paper aims to describe the geomorphological evolution and monitoring of this coastal landslide: both geological and geomorphological field surveys supported by airborne imagery were carried out, as well as bibliographical research about past geotechnical investigations and topographical monitoring; furthermore, a new single-frequency Global Navigation Satellite System (GNSS) low-cost monitoring started in October 2015. Structural geology heavily influences the stability of this coastal slope: a fault cuts the landslide area N-S, as well as low-angle thrust fault planes with NE dip direction. The slope is affected by landslides with different intensity and kinematic evolution, in particular rockfalls and debris avalanches along the scarp and right flank and earth flow along the central sector and at the slope toe. Man-made structures are relevant and they mainly consist of retaining walls, drainage channels, buildings, hiking trails, roads and railway infrastructures. Data obtained by GNSS receivers have shown remarkable displacements during the last year, according to the results of previous topographical and geotechnical monitoring campaigns. Deep analysis of GNSS data, together with the support and maintenance of the actual monitoring program, will allow a better comprehension of the slope stability condition, essential for supporting the design of proper risk reduction interventions.

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Posted in 040_2 | Commenti disabilitati

Posted by stefper

040_2_03_2017

maggio 7th, 2018

DOI 10.4461/GFDQ.2017.40.11

MASTRONUZZI G., ARINGOLI D., AUCELLI P.P.C., BALDASSARRE M.A., BELLOTTI P., BINI M., BIOLCHI S., BONTEMPI S., BRANDOLINI P., CHELLI A., DAVOLI L., DEIANA G., DE MURO S., DEVOTO S., DI PAOLA G., DONADIO C., FAGO P., FERRARI M., FURLANI S., IBB A A., LUPIA PALMIERI E., MARSICO A., MELIS R.T., MILELLA M., MUCERINO L., NESCI O., ORRÚ P.E., PANIZZA V., PENNETTA M., PIACENTINI D., PISCITELLI A., PUSCEDDU N., RAFFI R., ROSSKOPF C.M., SANSÓ P., STANISLAO C., TARRAGONI C., VALENTE A.,

Geomorphological map of the Italian coast:from a descriptive to a morphodynamic approach

Pages 161-196

Abstract

This study was conducted within the framework of the “Coastal Morphodynamics” Working Group (WG) of the Italian Association of Physical Geography and Geomorphology (AIGeo), according to the Institute for the Protection and Environmental Research (ISPRA) for the updating of the legend for the “Geomorphological Map of Italy”. The WG deals with the legend for the coastal areas, focusing its work on marine, lagoon and aeolian landforms, processes and deposits. In particular, the legend aims to classify coastal landforms in order to contribute to hazard and risk assessment, for supporting land-use planning and management. The legend allows the mapping of each landform in function of its genesis as well as its evolution and present dynamics, providing information about morphological characteristics at small and large scales. The relict morphological features and the active ones are reported along with the quantitative parameters useful for the description of the present wave/climate conditions and morphodynamics. As a result of the activities and experiments carried out by the “Coastal Morphodynamics” AIGeo WG during the last years, some examples of coastal geomorphological mappings at different scales (1:5,000 and 1:25,000) have been developed and are presented in this paper. The maps focus both on littoral plains and rocky coast dynamics as well as on the interactions with anthropic modifications.

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040_2_02_2017

maggio 7th, 2018

DOI 10.4461/GFDQ.2017.40.10

GROOS A.R., MAYER C., SMIRAGLIA C., DIOLAIUTI G., LAMBRECHT A.,

A first attempt to model region-wide glacier surface mass balances in the Karakoram: findings and future challenges

Pages 137-159

Abstract

In contrast to the central and eastern part of High Mountain Asia (HMA), no extensive glacier mass loss has been observed in the Karakoram during previous decades. However, the potential meteorological and glaciological causes of the so-called Karakoram Anomaly are diverse and still under debate. This paper introduces and presents a novel glacier Surface Mass Balance Model (glacierSMBM) to test whether the characteristic regional mass balance pattern can be reproduced using recent field, remote-sensing and reanalysis data as input. A major advantage of the model setup is the implementation of the non-linear effect of supra-glacial debris on the sub-surface ice melt. In addition to a first assessment of the annual surface mass balance from 1st August 2010 until 31st July 2011, a sensitivity analysis was performed to investigate the response of Karakoram glaciers to recent climate change. The mean modelled glacier mass balance for the Karakoram during the observation period is -0.92 m water equivalent (w.e.) a-1 and corresponds to an annual melt water contribution of ~12.66 km3. Data inaccuracies and the neglected process of snow redistribution from adjacent slopes are probably responsible for the bias in the model output. Despite the general offset between mass gain and mass loss, the model captures the characteristic features of the anomaly and indicates that positive glacier mass balances are mainly restricted to the central and northeastern part of the mountain range. From the evaluation of the sensitivity analysis, it can be concluded that the complex glacier response in the Karakoram is not the result of a single driver, but related to a variety of regional peculiarities such as the favourable meteorological conditions, the extensive supra-glacial debris and the timing of the main precipitation season.

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040_2_01_2017

maggio 7th, 2018

DOI 10.4461/GFDQ.2017.40.9

ALTIN T.B., ALTIN B.N. & ÖZTÜRK M.Z.,

Climatic and tectonic effects on terrace formation during the late quaternary in the Upper Yeşilirmak Valley, northern Turkey

Pages 123-136

Abstract

This study was carried out in the upper course of the Yeşilırmak River, which is one of the biggest rivers reaching the Black Sea, northern Turkey. We distinguished two fluvial terraces and dated them using OSL technique. T2 is the young terrace and situated at ~11 m above the actual river (at 620 m asl). T1 is the youngest and situated at ~5-6 m above the actual river (at 605 m asl). From the lower dated terrace (T1) was dated 6735 ka, 5277 ka and 4226 ka, respectively. From the higher dated terrace (T2) was dated 24,139 ka, 22,008 ka, 12,694 ka and 11,307 ka, respectively. While the higher terrace aggraded during three important cold periods (Heinrich 2 event (H2), the Last Glacial Maximum (LGM) and the Younger Dries (YD), the lower terrace (the present floodplain) aggraded during the Holocene Climatic Optimum (HCO). The river incised during transition from the LGM to Holocene transition and after the HCO. the Yeşilırmak has incised its valley ~11 m during the last 24 ka. These results indicate an average incision rate of 1.25 mm/yr (1.25 m/ka).

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Posted in 040_2 | Commenti disabilitati

Posted by stefper