SEDIMENTATION ANALYSIS ON SEYHAN DAM RESERVOIR USING LONG TERM BATHYMETRY DATA

Abstract

In this study, sedimentation in the Seyhan Dam reservoir was investigated by analyzing a long-term bathymetric survey dataset. The focus was on understanding how reservoir capacity changes impact reservoir operation rules. The findings revealed that sedimentation from the main branch of the Seyhan River has largely stopped since the construction of the Çatalan Dam, but sedimentation from the Çakıt branch continues. Furthermore, the study observed changes in the upper basin between 1990 and 2018 based on the CORINE Land Cover (CLC) dataset. The forest area increased from 23.71% to 24.36%, and water bodies expanded from 0.3% to 0.9%. This increase in forest and water bodies contributed to a reduction in sediment flow into the Seyhan Dam reservoir. The researchers used regression analysis and found a high correlation (R2=0.96) between water storage capacity changes and time (in years) at a 67.5-meter water level in the Seyhan Dam Reservoir. Overall, the study's results suggest that the decrease in sediment entering from the main branch of the Seyhan River has significantly improved the sedimentation issue.

Keywords

• Seyhan Dam
• Seyhan River Basin
• Bathymetric Survey
• Reservoir Operation

UZUN DÖNEM BATİMETRİ VERİLERİ KULLANILARAK SEYHAN BARAJ REZERVUARINDA SEDİMANTASYON ANALİZİ

Abstract

Bu çalışmada Seyhan Barajı rezervuarındaki sedimantasyon durumu uzun vadeli bir batimetrik ölçüm veri seti analiz edilerek araştırılmıştır. Çalışmanın odak noktası, rezervuar kapasitesi değişikliklerinin rezervuar işletme kurallarını nasıl etkilediğini anlamaktır. Bulgular, Seyhan Nehri'nin ana kolundaki sediment birikiminin Çatalan Barajı'nın inşasından bu yana büyük ölçüde durduğunu, ancak Çakıt kolundaki sediment birikiminin devam ettiğini ortaya çıkarmıştır. Ayrıca çalışmada, CORINE Arazi Örtüsü (CLC) veri setine dayanılarak 1990 ile 2018 yılları arasında üst havzadaki değişiklikleri gözlemlenmiştir. Orman alanı %23,71'den %24,36'ya, su kütleleri ise %0,3'ten %0,9'a yükselmiştir. Orman ve su kütlelerindeki bu artış, Seyhan Barajı rezervuarına sediment akışında azalmaya katkıda bulunmuştur. Araştırmacılar regresyon analizini kullanarak Seyhan Baraj Gölü'ndeki 67,5 metre su seviyesinde su depolama kapasitesi değişiklikleri ile zaman (yıl) arasında yüksek bir korelasyon (R2=0.96) bulmuştur. Genel olarak bu çalışmanın sonuçları, Seyhan Nehri'nin ana kolundan giren sediment miktarının azalmasının, sedimantasyon sorununu önemli ölçüde iyileştirdiğini göstermektedir.

Keywords

• Seyhan Barajı
• Seyhan Nehir Havzası
• Batimetrik Ölçüm
• Baraj İşletmesi

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