Radar İnterferometri Teknikleri Kullanarak Derin Kompleks Heyelanların İzlenmesi: Karaoğlan Havzası (Mersin-Türkiye)

Öz

Akdeniz bölgesinde yer alan Mersin ve Erdemli bölgelerindeki heyelan envanter haritalama çalışmaları farklı dönemlerde çok sayıda eski büyük ölçekli ve yeni küçük ölçekli heyelanların gelişmekte olduğunu göstermektedir. Güncel aktif heyelanlar çoğunlukla aşırı yağışlar ile tetiklenmekte iken eski heyelanların diğer hazırlayıcı çevresel faktörlerin yanı sıra jeomorfolojik vadi gelişim süreçlerinin bir parçası olarak gerçekleştiği düşünülmektedir. Eski heyelan alanlarının mekânsal dağılımı incelendiğinde resifal kireçtaşlarının üzerlediği ofiyolit ve ofiyolitik melanj birimlerinde gerçekleşen gerileyen, derin kompleks ve rotasyonel kaymalardır. Bu çalışmada belli bir zaman aralığı için Karaoğlan havzasında gerçekleşen heyelanların neden olduğu yüzey deformasyonları radar interferometri teknikleri ile incelenmiştir. Heyelanlarla ilişkili deformasyonlar 2007 ve 2011 yılları arasında L-band ALOS-PALSAR algılayıcısı radar görüntüleri kullanılarak tespit edilmiştir. Aktif heyelanlarla ilişkili değişim kesitleri oluşturulmuştur. Fark interferogram kesitlerinde ortalama yer değiştirme uydu görüntü alım doğrultusunda 3,5 cm olarak ölçülmüştür. Çalışma alanında fark SAR interferometri sonuçları incelenen dönemde 10 mm/yıl olarak oldukça yavaş bir hareket söz konusu olduğunu göstermektedir.

Anahtar Kelimeler

• Heyelan
• SAR interferometry
• DinSAR
• Mersin

Monitoring of Deep-Seated Landslides at Karaoğlan Catchment Using Radar Interferometry Techniques (Mersin, Turkey)

Öz

Landslide inventory mapping studies around Mersin and Erdemli regions of southern Turkey revealed that numerous old large-scale and recent small-scale landslides were presumably aroused in different time intervals. While the recent active landslides have been mostly triggered by excessive rainfall, old landslides are considered to be occurred by geomorphologic valley incision processes besides the other preparatory environmental conditions. The evaluation of the spatial distribution of old landslides present retrogressive, deep-seated with complex and rotational slides in the ophiolites and ophiolitic melange units comprising also overlying reefal limestones. In this study, surface deformations caused by landslides were evaluated using radar interferometry techniques for a specified period in Karaoglan catchment. Landslide related deformations were detected over radar images of L-band ALOS-PALSAR sensor for the years between 2007 and 2011. Landslides which are active are investigated in detail cross-sections. The mean displacement from differential interferogram cross-sections was measured 3.5 cm in LOS direction. Differential SAR interferometry for studied period depicts that the average rate of movement for the entire area is extremely slow with a rate of 10 mm/yr.

Anahtar Kelimeler

• Landslide
• SAR interferometry
• DinSAR
• Mersin

Kaynakça

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