HEC-RAS and GIS Based Flood Hazard Analysis: A Case Study of Muş Basin

Öz

Urbanisation, uncontrolled land use, infrastructure and engineering practices that are inconsistent with basin characteristics, and settlement planning that does not consider flood risk alter natural drainage systems, thereby obstructing surface runoff and increasing flood hazards. Due to topography and climatic conditions that intensify flow processes, Eastern Anatolia is, after the Aegean and Eastern Black Sea regions, one of the regions where flood events are frequently observed. The Muş Basin, located in the Eastern Anatolia Region and covering an area of 3.482 km², is one of Turkey's plains most frequently affected by floods. In this study, the flood threat in the Muş Basin was simulated under various discharge scenarios using measured flow data from previous years, a 5-m-resolution Digital Terrain Model (DTM), and the HEC-RAS 1B modelling system. The results indicate that flood depth and flow velocity exhibit significant spatial variability across the basin. In particular, high flood risk has been identified in the vicinity of the settlements of Sungu, Yeroluk, Mercimekkale, and Muratgören, and these findings are spatially consistent with flood events recorded in previous years

Anahtar Kelimeler

• HEC-RAS
• GIS
• Flood
• Muş
• Türkiye

Destekleyen Kurum

Izmir Bakırçay University

Etik Beyan

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Teşekkür

This study was produced from the Master's thesis carried out in Izmir Bakırçay University, Department of Geography. We would like to thank the General Directorate of Electrical Works, the Disaster and Emergency Management Presidency (AFAD), the General Directorate of Cartography and and Mustafa Utlu for their technical support and important data sets.

HEC-RAS ve GIS Tabanlı Taşkın Tehlikesi Analizi: Muş Havzası Örneği

Öz

Kentleşme, kontrolsüz arazi kullanımı, havza özellikleriyle uyumsuz şekilde tasarlanan altyapı ve mühendislik uygulamaları ile taşkın riskini dikkate almadan tasarlanan yerleşim planlaması, doğal drenaj sistemlerini değiştirerek yüzeysel akışı engellemekte bu da taşkın tehlikesini artırmaktadır. Topografya ve iklim koşullarının akış süreçlerini yoğunlaştırması nedeniyle, taşkın olaylarının Ege ve Doğu Karadeniz’den sonra sık görüldüğü bölgelerden biri Doğu Anadolu’dur. Doğu Anadolu Bölgesi'nde yer alan 3.482 km² büyüklüğündeki Muş Havzası, Türkiye’de en çok taşkın gözlemlenen ovalardan biridir. Bu çalışmada, Muş Havzası'ndaki taşkın tehdidi; geçmiş yıllara ait ölçülmüş akım verileri, 5 m çözünürlüklü Dijital Arazi Modeli (DTM) ve HEC-RAS 1B modelleme sistemi kullanılarak çeşitli deşarj senaryoları kapsamında simüle edilmiştir. Sonuçlar, taşkın derinliği ve hızının havza genelinde önemli mekânsal farklılıklar gösterdiğini ortaya koymaktadır. Özellikle Sungu, Yeroluk, Mercimekkale ve Muratgören yerleşimleri çevresinde kritik taşkın riskinin yüksek olduğu belirlenmiş olup, bu bulgular geçmiş yıllarda meydana gelen taşkın olaylarıyla uyum göstermektedir.

Anahtar Kelimeler

• HEC-RAS
• GBS
• Taşkın
• Muş
• Türkiye

Destekleyen Kurum

Izmir Bakırçay Üniversitesi

Etik Beyan

Tüm yazarlar adına, ilgili yazar çıkar çatışması olmadığını beyan eder.

Teşekkür

Bu çalışma, İzmir Bakırçay Üniversitesi Coğrafya Bölümü'nde yapılan yüksek lisans tezinden üretilmiştir. Teknik destek ve önemli veri setleri için Elektrik İşleri Genel Müdürlüğü, Afet ve Acil Durum Yönetimi Başkanlığı (AFAD), Haritacılık Genel Müdürlüğü ve Mustafa Utlu'ya teşekkür ederiz.

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