Το ατύχημα στο φράγμα Oroville: πιθανά αίτια και λύσεις

Κοσκινάς, Αριστοτέλης - Ευστάθιος; Koskinas, Aristotelis-Efstathios

dc.contributor.author	Κοσκινάς, Αριστοτέλης - Ευστάθιος	el
dc.contributor.author	Koskinas, Aristotelis-Efstathios	en
dc.date.accessioned	2018-02-01T11:01:35Z
dc.date.available	2018-02-01T11:01:35Z
dc.date.issued	2018-02-01
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/46363
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.15072
dc.rights	Αναφορά Δημιουργού - Μη Εμπορική Χρήση - Παρόμοια Διανομή 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-sa/3.0/gr/	*
dc.subject	Φράγμα	el
dc.subject	Υπερχειλιστής	el
dc.subject	Ατυχήματα	el
dc.subject	Όροβιλ	el
dc.subject	Αίτια	el
dc.subject	Dam	en
dc.subject	Spillway	el
dc.subject	Incidents	el
dc.subject	Oroville	el
dc.subject	Causes	el
dc.title	Το ατύχημα στο φράγμα Oroville: πιθανά αίτια και λύσεις	el
dc.title	The Oroville dam 2017 spillway incident: possible causes and solutions	en
heal.type	bachelorThesis
heal.classification	Civil engineering	en
heal.classification	Δομική μηχανική	el
heal.classificationURI	http://skos.um.es/unesco6/330506
heal.classificationURI	http://data.seab.gr/concepts/02ff9f78ea1b299eed7001f9a8e3902c523bf335
heal.language	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2017-11-07
heal.abstract	The subject of this thesis is the 2017 Oroville Dam spillway incident. This event is yet another example of the severe problems the United States has with maintaining its large infrastructure. However, in order to better understand how events unfolded, it is first necessary to conduct a detailed analysis of Oroville Dam and the basic elements of its location, the Feather River Basin. An assessment of the hydroclimatic characteristics of the area reveals it to have a Mediterranean climate, indicated by heavy precipitation during the winter months, producing floods during the spring, followed by almost completely dry summers. From a geological standpoint, the area near Oroville Dam contains metavolcanic rock, which is of adequate hardness, but it is also significantly weathered, especially near the ground surface. This thesis also contains a summary of various Oroville Dam design elements, as well as a full history of its construction. This analysis reveals hidden clues that help identify the causes of the 2017 incident. Most significantly, design criteria for the main and emergency spillways appear much more relaxed than those of the main structure. Next, a study of the previous significant floods that occurred at Oroville Dam is conducted. This reveals that reservoir levels were much higher during the 2017 incident compared to other events, which indicates a need to lower the minimum flood control elevation. Futhermore, this thesis includes an extensive timeline of the 2017 incident events, including the damages to Oroville Dam’s main spillway chute and area downstream of the emergency spillway. After further research, initial cause of the main spillway failure is defined as concrete chute floor slab uplift, caused due to faults in the drain system below it. In addition, perusal of previous official inspection reports reveals that under current practice standards, if a comparable incident occurs again, its indications are unlikely to be detected in time. Finally, recommendations are made in order to avoid similar events from happening in the future. For Oroville Dam, this means lowering the minimum flood control elevation level and creating a fully armored concrete emergency spillway. In the short term, informal inspections by the authorities that operate large structures in the United States can discover faults before they turn into accidents. However, a more long-term plan to effectively repair and maintain the country’s existing infrastructure needs to be put into action immediately.	en
heal.advisorName	Κουτσογιάννης, Δημήτριος	el
heal.committeeMemberName	Κουτσογιάννης, Δημήτριος	el
heal.committeeMemberName	Παναγούλια, Διονυσία	el
heal.committeeMemberName	Μαμάσης, Νικόλαος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Πολιτικών Μηχανικών. Τομέας Υδατικών Πόρων και Περιβάλλοντος	el
heal.academicPublisherID	ntua
heal.numberOfPages	210 σ.
heal.fullTextAvailability	true