Assessment of flood hazards due to overtopping and piping in Dalaman Akköprü Dam, employing both shallow water flow and diffusive wave equations

Yılmaz, Kutay; Darama, Yakup; Oruc, Yunus; Melek, A. Berhan

doi:10.1007/s11069-023-05891-5

Cited by 10 publications

(4 citation statements)

References 27 publications

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“…Albu, L. M. [23] applied HECRAS 2D simulation to evaluate the impact of dam breach size on flood downstream considering a case study of Dracsani Lake. Psomiadis, E. [24] performed the HECRAS 2D dam breach model of Bramianos Dam to compare the downstream potential flood hazard using the Digital Elevation Model and Digital Surface Model. The flood hydrographs using Diffusion Wave and Full Saint Venant Equation were compared and found to be more or less similar at the downstream side of the dam section.…”

Section: Of 24mentioning

confidence: 99%

“…The flood hydrographs using Diffusion Wave and Full Saint Venant Equation were compared and found to be more or less similar at the downstream side of the dam section. Yilmaz, K. [24] modeled flood hazard assessment of Dalaman Akköprü Dam breach using 2D Diffusion Wave and Shallow Water Equation to compare the change in water depth and flow velocity due to the influence of neglected local acceleration and convective acceleration. Flow velocity decreases, and water depth increases in some of the sections of the river due to the effect of local and convective acceleration using the Full Dynamic Shallow Water Equation.…”

Section: Of 24mentioning

confidence: 99%

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Potential Dam Breach Flood Hazard Assessment of Kulekhani Reservoir Rock Fill Dam Using 2D Diffusion and Full Dynamic Shallow Water Equation Defining Coriolis Effect

Pandey,

Knoblauch,

Zenz

2023

Preprint

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Dam breaches have catastrophic consequences, causing severe property damage, life loss, and environmental impact. The Kulekhani reservoir rockfill dam break was studied to evaluate the downstream impact. The appropriate breaching parameter of MacDonald and Langridge (1984) regression equations was selected based on the sixteen observed dam failure cases and cross-sectional geometry of the existing dam of Kulekhani. The 2D Diffusion Wave and Full Dynamic Wave Equation were applied for downstream flood assessment, Full Dynamic Wave was able to capture the physical flow phenomena like river bend effects resulting in higher flow velocity at the outer bend, and formation of eddies considering losses. The application of a Full Dynamic Equation was found to be appropriate for rapidly varying unsteady flow considering steep slopes, and sudden changes in channel geometry. Flood mapping of water depth, flow velocity, flood intensity, and arrival time were carried out for flood hazard assessment classified by the American Society of Civil Engineers (ASCE). Flow depth and extension of the flow area were compared to identify the affected area, higher flow depth and larger extension were observed using a Full Dynamic Wave Equation as a result of less flow velocity considering the losses. Almost 17 minutes of the arrival time of peak difference at the Bagmati River confluence was evaluated between the models which plays an important role in decision-making for selection of the flood model. Flood mitigation with river diversion works through a hydraulic measure of Levee was suggested to protect the highly affected households of Ranche, Nagmar, Khanikhet, and Debaltar towns. Most of the household was found to be safe after the construction of the Levee except for eleven houses that lie along the river below flood elevation of 1269.6 m.a.s.l. This signifies the importance of room for the rivers and the human settlement near the river might be life-threatening.

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Section: Of 24mentioning

confidence: 99%

Section: Of 24mentioning

confidence: 99%

Potential Dam Breach Flood Hazard Assessment of Kulekhani Reservoir Rock Fill Dam Using 2D Diffusion and Full Dynamic Shallow Water Equation Defining Coriolis Effect

Pandey,

Knoblauch,

Zenz

2023

Preprint

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“…Yilmaz [20] modeled flood hazard assessment of the Dalaman Akköprü Dam breach using 2D FDWE and DWE to compare the change in water depth and flow velocity due to the influence of simplified and full momentum equation. Decreased flow velocity variation and higher water surface elevation were observed in some of the sections of the river due to the effect of local and convective acceleration using the FDWE.…”

Section: Introductionmentioning

confidence: 99%

Potential Dam Breach Flood Assessment with the 2D Diffusion and Full Dynamic Wave Equations Using a Hydrologic Engineering Center-River Analysis System

Pandey,

Knoblauch,

Zenz

2024

Water

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Dam breaches have catastrophic consequences, causing severe property damage, life loss, and environmental impact. The potential dam breach downstream flooding of the Kulekhani reservoir, Nepal, was studied using a 2D Diffusion Wave Equation (DWE) and Full Dynamic Wave Equation (FDWE) through an open-source solver, Hydrologic Engineering Center-River Analysis System (HEC-RAS). The suitable dam breach model was identified based on the dam geometry and sixteen historical dam failure cases. The simulated downstream peak was tested with an empirical relation, considering reservoir volume and duration of failure. Model comparisons through the flood plain mapping of water depth, flow velocity, flood intensity as per guidelines of the American Society of Civil Engineers (ASCE), and arrival time were carried out for flood hazard assessment. FDWE was able to capture the physical flow phenomena in the river bend resulting in higher flow velocity at the outer bend, lower velocity at the inner bend, and formation of eddies due to the application of the turbulence model, considering possible momentum losses, whereas DWE was unable to capture these effects due to a simplified momentum equation. The total area of flood extension was found to be increased by 30% using FDWE than the DWE due to higher water surface elevation. Most of the towns along the Kulekhani River were classified as “Very High” intensity flood regions according to ASCE, due to the V-shape valley. The peak time difference at the Bagmati River confluence was evaluated between the models. This plays an important role in decision-making for the selection of the flood model to make a safe evacuation plan. The application of FDWE was found to be suitable for the rapidly varying unsteady flow in the steep meandering river.

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“…Yılmaz vd. [12], Dalaman Akköprü Barajı'nın üstten aşma ve borulanma senaryoları ile yıkılması durumunda meydana gelecek akış derinliğini, hızını ve mansap bölgesinde bulunan yerleşim yerlerinin tehlike seviyelerini, sığ su ve difüzyon dalga denklemlerini kullanarak HEC-RAS programında modellemişlerdir. Elde edilen sonuçlar hem sığ su hem de difüzyon dalga denklemleri için su altında kalan alanlar benzer olmasına rağmen akış derinliği ve hız değerlerinin önemli ölçüde farklı olduğunu göstermiştir.…”

Section: Introductionunclassified

Mansap Pürüzlülüğünün Toprak Dolgu Barajın Üstten Aşma ile Yıkılması Durumunda Taşkın Dalgası ve Sediment Yayılımına Etkisinin Deneysel olarak İncelenmesi

Büyüker,

Taşkaya,

Bombar

et al. 2024

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Baraj yıkılması sonucu oluşan taşkın hareketinin belirlenmesi, mansap bölgesindeki mevcut yerleşim yerlerinde yıkılma sonrası meydana gelebilecek risklerin saptanması ve önlenmesi açısından önemli bir konudur. Sel nedeniyle suyun yayılması ve sediment taşınımının analiz edilmesi, taşkın hareketinin belirlenmesi için toprak dolgu barajlarda incelenen faktörler arasındadır. Bu çalışmada, üstten aşma ile yıkılan homojen toprak dolgu barajın mansabında yerleşim bölgesi bulunup bulunmamasının taşkın hareketine etkisi araştırılmıştır. Dikdörtgen kesitli betonarme kanalda medyan dane çapı d50=0,441 mm olan malzemeyle baraj gövdesi oluşturulmuştur. Barajın temelde genişliği 106 cm ve krette genişliği 10 cm ve gövde yüksekliği 30 cm'dir ve 1:1,6 memba ve mansap eğimlerine sahiptir. Her biri 10 cm olan üç kat sedimentin kademeli olarak serilmesi, her katın 1,5 kg ağırlık ile sıkıştırılması, eğimin verilmesi ve kret üzerine bir gedik açılması ile baraj gövdesi hazır hale gelmiştir. Baraj mansabına yerleşim alanını simüle etmesi için 10x10x10 cm’lik 13 adet beton küp yerleştirilmiştir. Baraj membasında su seviyesi kret seviyesine kadar kademeli olarak arttırılmış, açılan gedikten suyun baraj mansabına geçmesi sağlanmıştır. Deneyler yapılırken 2 kamera ile sedimentin yayılımı kayıt altına alınmıştır, 3 farklı noktada su derinlikleri ölçülmüştür. Deneyler sonunda yapılan ölçümler ile sedimentin derinlik profilleri elde edilmiştir. Baraj mansabında yerleşim yeri bulunması durumunda, küplere çarpan taşkın dalgasının hızı azalmış ve cetvele ulaşma süresi artmıştır. Küplerin etkisiyle baraj mansabında ölçülen taşkın dalgası derinlikleri artmıştır. Küplerin memba ve mansap bölgelerinde köprü ayağına benzer olarak oyulmalar ve birikmeler meydana gelmiştir. Bu birikmelere bağlı olarak yayılan sediment kalınlığı pürüzlü deneyde artmıştır.

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Assessment of flood hazards due to overtopping and piping in Dalaman Akköprü Dam, employing both shallow water flow and diffusive wave equations

Cited by 10 publications

References 27 publications

Potential Dam Breach Flood Hazard Assessment of Kulekhani Reservoir Rock Fill Dam Using 2D Diffusion and Full Dynamic Shallow Water Equation Defining Coriolis Effect

Potential Dam Breach Flood Hazard Assessment of Kulekhani Reservoir Rock Fill Dam Using 2D Diffusion and Full Dynamic Shallow Water Equation Defining Coriolis Effect

Potential Dam Breach Flood Assessment with the 2D Diffusion and Full Dynamic Wave Equations Using a Hydrologic Engineering Center-River Analysis System

Mansap Pürüzlülüğünün Toprak Dolgu Barajın Üstten Aşma ile Yıkılması Durumunda Taşkın Dalgası ve Sediment Yayılımına Etkisinin Deneysel olarak İncelenmesi

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