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SUSTAINABLE WATER RESOURCES MANAGEMENT IN THE TIBER RIVER BASIN (CENTRAL ITALY)
No full textThe study for the evaluation of the water resource still available
in the basin of the Tiber River involved a thorough check of flow
observation series, that resulted in a careful revision of stage-discharge
relationships and the utilisation of a large amount of stream
and spring flow measurements by other sources, in order to interpolate
the information obtained in the flow measurement stations.
The study was developed in three phases. First, the estimate of the distribution of natural low flow discharges throughout the basin;
second, the determination of the minimum instream flow for ecological and other requirements; third, the development of a model that, taking into account the instream flow and present uses of the resources, could evaluate the residual resource still available for further
uses and assess the reduction of water consumption aimed at a rational reallocation of water resources
Selection of the probabilistic model of extreme floods: the case of the River Tiber in Rome
No full textThe probability distribution of the annual maximum peak flows on the River Tiber at the town of Rome
(Ripetta) can be evaluated using the information available since the XV century. In this paper the probability
distribution of two series of annual peak flows maxima observed at the Ripetta gauge is analysed:
the systematic series, including all the data observed since the beginning of the systematic stage record in
1782, and the censored series of the exceptional floods that inundated the town of Rome, starting from
the XV century. In order to find a criterion for choosing the ‘‘optimum” distribution law for the high
return period quantiles, an index that takes into account both the accuracy and the uncertainty of the
quantiles estimation is proposed
Sono ancora a rischio d’inondazione i beni storico-artistici di Roma? L’informazione fornita dalle piene storiche. Resilienza delle Città d’Arte alle catastrofi Idrogeologiche: Successi e Insuccessi dell’Esperienza Italiana
No full textDistribution of the extreme peak floods of the Tiber River from the XV century
No full textThe peak stages of the extreme floods inundating the town of Rome are known since the XV century. This record covering more
than 500 years can be considered as a censored sample of the population of the peak flood stages at the site. To evaluate the peak
flow of the observed events the following information is available: (a) a long record of daily stage measurements up to the XVIII
century; (b) several records of daily rainfall depth measurement at two rain gauges in the Tiber catchment, extending at least up to
the middle of the XIX century; (c) detailed surveys executed immediately after the great flood of 1870, including the elevation plan of
the town, a survey of the riverbed and the flood hydrograph of the 1870 flood; (d) a less detailed survey of the riverbed executed in
1744; (e) a rich iconography, showing the conditions of the Tiber banks from the XVI century onward; (f) contemporary descriptions
of several extreme floodings; and (g) a rich series of flow measurements and bed surveys after the great flood of 1870 to present
days. A two-dimensional hydrodynamic model was used to simulate the flooding of the old town in order to determine the flow–
discharge relationship, thus allowing reconstruction of a record of the past extreme floods. A statistical analysis was developed for
evaluating the risk hazard, using the censored sample of all the extreme floods from the XV century and the sample of all the maximum
annual floods from the end of the XVIII century
Analisi statistica di una lunga serie di massimi colmi annuali
No full textLa valutazione della distribuzione di probabilità delle massime portate annuali sul Fiume Tevere a Roma può essere effettuata utilizzando un’informazione idrometrica che risale fino al XV secolo. In questa nota vengono analizzate le distribuzioni di tre campioni dei massimi colmi annuali osservati a Roma (Ripetta): il campione moderno, costituito dai valori osservati dall’inizio delle misure sistematiche di portata nel 1921, il campione completo, costituito dai valori osservati dall’inizio delle misure sistematiche d’altezza idrometrica nel 1782, e il campione tronco dei colmi delle piene eccezionali che a partire dal XV secolo hanno inondato la città di Roma. Vengono messe a confronto le distribuzioni di probabilità stimate sul campione completo e su campioni troncati in base a due diversi criteri. Si presenta, quindi, il problema della scelta del modello probabilistico da adottare per la stima dei quantili caratterizzati da elevato tempo di ritorno. A questo scopo si propone l’impiego di un indice che tiene conto insieme dell’accuratezza e dell’incertezza di stima dei quantili
Un modello numerico bidimensionale parabolico per la simulazione di inondazioni: l’utilizzo di storage cells costruite su TIN e un’applicazione al fiume Arrone
No full textEfficacia di un sistema di casse d’espansione per la difesa idraulica della città di Roma
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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