Flood risk analysis of residential areas at downstream side of Elmali dam

Abstract

Floods are usually influenced by the interaction of catchment-specific characteristics, such as meteorology, topography, geology and lately climate change. Flood risk assessment issue have traditionally been the domain of hydrologists, water resources engineers and statisticians. Researchers have scientifically proven a sharp global increase in the economic risk associated with floods though flood-related fatalities might be decreasing. The Elmali spillway, immediately upstream of Göksu river in İstanbul, is essential for reducing flood risk. However, Authorities release a huge amount of water at a dam during heavy rainfall, causing floods in many parts of the Göksu river district. In this study, vulnerability risk assessment of Göksu river basin is considered. To this aim, various scenarios are developed based on spilled discharges with various return periods. Later, the impact of spilled discharges on floodplains are mapped. Risk zones are predicted.

Keywords

• Flood,Risk analysis,Numerical,MIKE 21

References

1. [1] DSİ, (2013), “su kaynaklarının geliştirilmesi çalışma grubu raporu” ormancılık ve su şurası, 12 Mart.
2. [2] Özcan O., Musaoglu N., Seker D.Z., Tanik A. (2008), Determination of flood risk in Sakarya sub basin using remotely sensed data and GIS, Fresenius Environmental Bulletin, 17(11b), 1964-1971.
3. [3] Özdemir, H., (2007). Farklı Senaryolara Göre Taşkın Risk Analizi: Havran Çayı Örneği (Balıkesir). TMMOB Afet Sempozyumu Bildiriler Kitabı, 155-165.
4. [4] Abdollahzadehmoradi, Y., Erdik, T., Mahnamhar, F., Özger, M., Altunkaynak, A., (2013). “MIKE 11 ile Samsun ili, İlkadım İlçesi, Çay mahallesi, gecekondu önleme bölgesi taşkın riskinin belirlemesi” Taşkın ve Heyelan Sempozyumu kitabı, 565-572, Trabzon, Türkiye.
5. [5] Ağıralioğlu, N., Altunkaynak, A., Özger, M., (2015), “Elmalı - I ve II barajları mühendislik incelemeleri teknik raporu” İSKİ.
6. [6] Ural, O.M. and Ungan, Ü., (1967) Large Dams in Turkey, DSİ.
7. [7] Orhon, M., Esendal, S., Kazak M.A., (1991), Türkiye’deki Barajlar; Dams in Turkey, DSİ Genel Müdürlüğü.
8. [8] DHI, 2010. MIKE 21 & MIKE 3 Flow Model FM. Hydrodynamic and Transport Module Scientific Documentation, Release 2010, (D.H.I). Danish Hydraulic Institute.

9. [9] Tingsanchali, T., ve Karim, M.F. (2005), “Flood Hazard and Risk Analysis in the Southwest Region of Bangladesh”, Hydrological Processes, 19, 2055-2069.