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Simonetto, Anna (2010) Caratteristiche morfologiche di alcuni fiumi ghiaiosi antropizzati e naturali e studio della stabilità del fiume Brenta tra Bassano e Carturo. [Laurea specialistica biennale]

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Abstract

This work analyses morphological and hydrological processes of gravel-bed rivers located in different geographic contexts: the North Eastern Italian region (Brenta River) and the central Patagonic region. Within the study reaches, the grain size distribution of the sediments is significantly different between riffles and pools, being coarser in the former. The downstream fining tendency is evident as well, whereas the armour ratio seems more influenced by differences in sediment supply conditions rather than the downstream trend. A comparison of cross sections measured in 1997 and 2009 revealed an incision trend in the upper part of the study reach (which is 21 km long) and a sedimentation tendency in the lower part. This trend is confirmed by a numerical simulation which reveals a downstream reduction of shear stress, thus allowing sediment erosion (bank erosion and slight incision) in the upper portion of the reach and sedimentation downstream. On the other hand, the hydrological analysis reveals that overall the building of the dam system in the upper part of the basin has not changed the recurrence of moderate to high flows, keeping the formative bankfull discharge at the same value is analyzed before and after the dam closure.

Item Type:Laurea specialistica biennale
Corsi di Laurea specialistica biennale:Facoltà di Agraria > Scienze forestali ed ambientali
Uncontrolled Keywords:Brenta, Gravel - bed river, river morphology, hec - ras.
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/08 Idraulica agraria e sistemazioni idraulico-forestali
Codice ID:26626
Relatore:Lenzi, Mario Aristide
Correlatore:Mao, Luca and Kaless, Gabriel
Data della tesi:2010
Biblioteca:Polo di Agripolis - Legnaro > Biblioteca di Agripolis "Pietro Arduino"
Collocazione:TES-694
Tipo di fruizione per il documento:on-line per i full-text
Tesi sperimentale (Si) o compilativa (No)?:Yes

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