1,720,979 research outputs found
Sinkhole genesis and evolution in Apulia, and their interrelations with the anthropogenic environment
No full textSinkhole development occurs in many areas of the world where soluble rocks crop out. Sinkholes are generally the surface expression of the presence of caves and other groundwater flow conduits in carbonate rocks, which are solutionally enlarged secondary permeability features. Their formation may be either natural or caused by man's activities. In both cases, heavy consequences have to be registered on the anthropogenic environment and related infrastructures. Knowledge of the mechanism of formation of this subtle geohazard is therefore necessary to planners and decision makers for performing the most appropriate and suitable programs of land use and development. The Apulia region of southern Italy is characterized for most of its extension by carbonate rocks, which makes it one of the most remarkable example of karst in the Mediterranean Basin. Based on analysis of literature and in situ surveys, including caving explorations, we have identified in Apulia three main types of possible mechanisms for sinkhole formation: 1) collapse of a chamber in a natural cave or in man-made cavities; 2) slow and gradual enlargement of doline through dissolution; 3) settlement and internal erosion of filling deposits of pre-existing dolines. Since sinkhole formation very often affects directly the human settlements in Apulia, and have recently produced severe damage, some considerations are eventually presented as regards the interrelationships between sinkholes and the anthropogenic environment. © 2004 Author(s)
Water resource management in karstic catchments: the case of the Asso Torrent basin (Southern Italy)
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The recent floods in the Asso Torrent basin (Apulia, Italy): An investigation to improve the stormwater management
Full text linkStormwater management is of concern to public institutions and academies. In the Asso Torrent endorheic basin (Salento peninsula, Southern Italy), a network of natural and artificial channels crossing urban and rural areas and flowing towards six swallow karst holes, several floods occurred in the last six years, after the end of extensive hydraulic works. In this paper, the results of an observational study on the meteorological and hydrological factors concurring to these floods are reported. It was inferred that soil saturation, cumulative precipitation anticipating the events, and clogging of the swallow holes are of relevance and must be considered in the definition of new criteria in decision-making procedure. The adoption of both innovative modeling techniques and real-time control should be an efficient solution to properly regulate the flow control devices before and during the precipitation events. With a view to providing solutions for a sustainable management of the water resources, easy-to-implement measures are suggested, such as the selection of flood-tolerant crops and construction of harvesting systems for alternative water uses
Sobre la presencia del Grupo de Globorotalia phosi en las Margas de Vicchio (Apeninos Septentrionales Italia). Implicaciones paleoceanograficás.
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Evoluzione del segmento interno dell'Avanfossa Appenninica durante il Miocene medio (Spartiacque tosco-romagnolo).
No full textValutazione dello stato di conservazione delle “spunnulate” della costa di Porto Cesareo e Nardò (Provincia di Lecce) con un approccio vegetazionale
No full textThe Marnoso-arenacea Fm. betweeen Bocca Trabaria and Campigna (Northern Apennines): lithostratigraphy from Schlier to the Verghereto Marls Fms., in a new structural context.
No full textAssessment of Specific Yield in Karstified Fractured Rock through the Water-Budget Method
Full text linkIn this note, the Water Budget Method (WBM) is applied to estimate local values of the specific yield of the deep karst aquifer of Salento peninsula. A selection in a period of two years of relevant short precipitation events has been considered and the related localized recharges have been compared to the water table fluctuations measured at two selected wells. The recharge amounts have been corrected by using data of evapotranspiration and soil water storage available from a micrometeorological base. The results are very similar for both the wells and more consistent when the corrections are applied. A discussion involving frequency and apertures of the fractures in the rock mass of the aquifer suggests the effect of the karst dissolution to be dominant in determining these values of the specific yield
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