Comparison of linear, labyrinth and piano key weirs to increase the discharge capacity of existing spillways for a given head

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2014

Öğrenci: DENİZ KARAEREN

Danışman: ZAFER BOZKUŞ

Özet:

Dams play an important role in infrastructure of our country and provide drinking water, flood protection, renewable hydroelectric power, navigation, and irrigation as well as facilities for sports activities. However, dams in Turkey are gradually aging and in order to assure the safety of those aging dams, rehabilitation is necessary. Very often, increasing the capacity of a spillway would be required in rehabilitation works. Thus, it is the main goal of this study to investigate some practical methods used in increasing the spillway capacity of dams. In this respect, labyrinth and piano key weir types were selected as the two effective methods to achieve that mentioned goal. Design procedure of labyrinth weirs and piano key weirs were outlined and each one applied in five different existing projects. Comparisons were made with linear weirs, it was concluded that labyrinth and piano key weirs increase the effective crest length of a dam spillway significantly for a given spillway width, therefore, in return, they increase the flow capacity for a given operating head. Moreover, different geometric parameters were also studied to see their effect in changing the discharge capacity.