1,721,038 research outputs found
Modelling of the geomorphic characteristics of the toe accumulation zone of earth-flow landslides
No full textABSTRACT: The authors have recently proposed a morpho-evolutive mechanical model to interpret the
geomorphic characteristics of the accumulation zone of earth-flow landslides and its evolution. It is based on a
passive failure mechanism at the toe of the flow channel. This paper presents an analytical formulation of the
proposed passive failure mechanism. The presented mathematical model has been applied to back calculate
shear strength parameters along the toe shear surfaces of the huge Balzo del Prete earth-flow landslide in
Southern Italy
Desertification risk in Southern Apulia rainfall decreasing analysis
No full textThe Southern Italy has been subject, during the past century, to a general rainfall decreasing more evident during the last years, specially in the southern part of Apulia region. A territorial analysis based on rainfall and temperature data from 27 rainfall gouge station for a period of 68 years (1928-96) has show the intensity of rainfall decreasing trend and aridity increasing all over Soutern Apulia. The analysis has show that rainfall decreasing has a strong influence on groundwater resources recharge. This situation imply a strong desertification risks for the studied area, specially in Taranto district, also for the risk of groundwater resources degradation
Fasi di attivazione e maturità geomorfologica di due frane tipo colata nei pressi di Campomaggiore Vecchio (Basilicata).
No full textSlope instability processes in the Mefitis sanctuary archaeological site (southern Italy).
No full textThe paper describes the results of the geomorphological studies carried out in archaeological site of Rossano di Vaglio (Basilicata,southern Italy), where an important sanctuary was built during the 4th century B.C. This study is based on geomorphological surveys, integrated by accurate interpretations of aerial photos, and of high-resolution geophysical surveys. De-scribes the stability of the archeological site with references to the landslide on which the sa-cred complex was built
Preliminary remarks on gravitational tectonic deformations and DSGSD in mount Poro headland (Calabria - South Italy)
No full textOn the use of a visco-plastic sliding-law for prevailing longitudinal dimension slow landslides
No full textThis paper presents and discusses the use of a mechanical model based on a visco-plastic sliding law for the study of the kinematic features of prevailing longitudinal dimension slow landslides. The model correlates sliding velocity and effective stress along the shear surface. An application to a case history is also presente
On the use of visco-plastic sliding-law for prevailing longitudinal dimension slow landslides.
No full textCaratteri geologico -strutturali dell’area di Taranto e potenziali implicazioni sulla genesi del Mar Piccolo di Taranto (Puglia)
No full textL’intero Arco Jonico, ad iniziare dal bordo sud–occidentale murgiano e proseguendo verso est fino a Taranto e poi a Manduria, presenta una serie di rotture tettoniche di tipo distensivo e trascorrente, che hanno dato luogo al collasso ed alla dislocazione di grandi masse carbonatiche fratturate e carsificate del Cretaceo. Queste condizionano il deflusso delle acque sotterranee provenienti del “piastrone” carbonatico murgiano verso la depressione morfologica dell’area di Taranto favorendo il drenaggio verso questa area di grandi portate di acqua sotterranea. Nella piana di Taranto, specialmente verso est, la presenza di una spessa copertura argillosa Pleistocenica sovrastante i litotipi calcarei impedisce il libero deflusso verso mare di queste acque, che risultano confinate al di sotto del livello marino e presentano carichi idraulici che in prossimità della costa risultano superiori al livello medio marino. Dove la copertura argillosa è meno spessa l’acqua in pressione può dar luogo a fenomeni di sifonamento degli strati argillosi, i quali fenomeno possono essere all’origine delle depressioni morfologiche presenti nella conca di Taranto fra cui quelle dove oggi hanno sede il Mar Piccolo ed il Mar Grande di Taranto
Data-driven Modeling of the Dynamic Response of a Large Deep Karst Aquifer
Full text linkAbstractThe analysis of the dynamic response of a karst aquifer to precipitation is not simple due to the complex structure of the aquifer causing non-linear variations of the groundwater table. This work presents the study of the dynamic response of the large deep karst aquifer of central Apulia, south Italy, based on a data-driven approach, namely Evolutionary Polynomial Regression applied to the data of four wells for which about 15 years of monthly average levels are available. The dynamic response of the aquifer is modeled as prediction of the groundwater levels given total monthly precipitations and past measured groundwater levels
Analysis of capillary barrier effects in the activation of debris avalanches in pyroclastic cover, Campania (Southern Italy)
No full textOn May 1998 many landslides involving pyroclastic covers lying on the slope of Pizzo
D’Alvano relief hit the towns of Bracigliano, Quindici, San Felice a Cancello, Sarno (Campania, Italy).
They were triggered by a prolonged and continuous rainfall event but certainly not extraordinary in
terms of return time. The aim of the investigations carried out within this work, by means of in situ and
lab testing, and by means of numerical simulations, is to point out some aspects related to triggering
mechanisms of debris flows that appear relevant to the authors. In particular, attention is paid to
retention phenomena of filtering waters due to the build up of capillary barriers in the interface between
fine and coarser pyroclastic layers, causing suction head to drop to a level that triggers a landslide
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