ÜÇGEN ŞEKLİNDEKİ TAŞKIN HİDROGRAFINDAN KAYNAKLANAN TABAN MALZEMESİ TAŞINMASININ DENEYSEL ARAŞTIRILMASI

Öz

Bu çalışma kapsamında, DEÜ Hidrolik Laboratuvarında mevcut 18,6 m uzunluğundaki kanalda zamanla değişen akım rejiminde sürüntü maddesi hareketi incelenmiştir. Deneyler üçgen şeklindeki farklı giriş hidrografları kullanılarak ve membadan sürüntü maddesi beselemesi olmadan gerçekleştirilmiştir. Kanal tabanına D50= 4,8 mm, standart sapması gσ =1,4 mm olan üniform malzeme serilmiştir. Kanal mansabında bulunan sepetlerde toplanan malzeme tartılarak sürüntü maddesi yükü belirlenmiş ve bu değerler ‐literatürde verilen ampirik denklemlerin zamanla değişen akımlar için de uygulanabilir olduğu kabulüyle ‐ hesaplananlar ile karşılaştırılmıştır. Deneysel bulguların, konuyla ilgili literatürde yer alan denklemlerden Engelund ve Fredsoe (1976) tarafından verilen ampirik bağıntı ile daha çok uyumlu olduğu görülmüştür.

Anahtar Kelimeler

• Açık kanal akımı, Taban malzemesi hareketi, Üçgen taşkın hidrografı.

Experimental Study of Bed Material Transport Resulting from Triangular Flood Hydrographs

Abstract

In this study, experiments are carried out in the system designed and built in Hydraulics Laboratory of DEU, involving a rectangular flume of 18.6 m length in order to investigate the sediment transport in the cases of unsteady flow. The flume experiments are conducted using different triangular shaped input hydrographs without sediment feeding at upstream. The sediment median size D50 and the standard deviation gσ are 4.8 mm and 1.4 mm, respectively. The sediment is collected at the downstream end of the flume and weighed. The measured bed load values are compared with those calculated from the empirical relations given in the relevant literature for steady flow cases, assuming that they are also applicable in unsteady cases. It is found that the measured bed load values are better compatible with those calculated from the expression given by Engelund and Fredsoe (1976).

Keywords

• Open channel flow, Bed material transport, Triangular flood hydrograph.

Kaynakça

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