Earthquake-Induced Sloshing Analysis of Circular Type Clarifier

Öz

Wastewater treatment plants with large tanks and sensitive mixing equipment are earthquake-critical infrastructures. Damage to the structures in such facilities during earthquakes can cause environmental pollution and threaten public health. Since the embedded pools in the treatment plants are not of different geometries and sizes, they may exceed the air share of the wave height due to the sloshing event. As a result, overflows that may occur during an earthquake can cause environmental problems by polluting the groundwater. Besides, treatment units may be disabled due to damage to non-structural elements in these units during an earthquake. This situation will threaten public health as it will disrupt the service of the entire facility after the earthquake. In this study, sloshing analysis under Kocaeli 1999 earthquake signal of a circular type clarifier in Kullar Wastewater Treatment Plant located in Kocaeli district was analyzed using numerical modeling tools. Due to the sloshing, 90 cm high water surface displacement in the clarifier and 5000 Pa hydrodynamic pressure near the bottom of the clarifier wall were calculated.

Anahtar Kelimeler

• Earthquake
• Treatment Plant
• Sloshing
• Public and Environment Health

Dairesel Tipteki Çöktürme Havuzunun Deprem Altındaki Çalkalanma Analizi

Öz

Büyük tanklar ve içinde hassas karıştırma ekipmanları bulunduran atık su arıtma tesisleri deprem açısından kritik altyapılardır. Depremler sırasında bu tür tesislerdeki yapıların hasar görmesi çevre kirliliğine neden olabilmekte ve halk sağlığına tehdit oluşturabilmektedir. Arıtma tesislerindeki gömülü havuzlar farklı geometri ve boyutlarda olmamasından dolayı çalkalanmaya bağlı dalga yüksekliğinin hava payını aşabilir. Bunu sonucunda deprem sırasında meydana gelebilecek taşmalar yeraltı suyunu kirleterek çevre problemine yol açabilir. Ayrıca bu havuzların içindeki yapısal olmayan elemanların deprem sırasında hasar görmesi sonucu arıtma birimleri devre dışı kalabilir. Bu durum deprem sonrasında tüm tesisin hizmet vermesini aksatacağı için halk sağlığını tehdit edecektir. Bu çalışma kapsamında Kocaeli il sınırları içinde yer alan Kullar Atıksu Arıtma Tesisindeki dairesel tipteki bir son çöktürme havuzunun Kocaeli 1999 deprem sinyali altındaki çalkalanma analizi sayısal modelleme yardımıyla incelenmiştir. Çalkalanmaya bağlı olarak havuz içinde 90 cm yüksekliğinde çalkantı dalgası ve havuz duvarının taban yakınında 5000 Pa hidrodinamik basınç hesaplanmıştır.

Anahtar Kelimeler

• Deprem
• Arıtma Tesisi
• Çalkalanma
• Çevre Kirliliği

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