Effect of the Voellmy Coefficients on Determining Run-out Distance: A Case Study at Uzungol, Turkey

KOÇYİĞİT Ö., Gurer I.

GAZI UNIVERSITY JOURNAL OF SCIENCE, cilt.20, sa.3, ss.79-85, 2007 (ESCI) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 20 Sayı: 3
  • Basım Tarihi: 2007
  • Dergi Adı: GAZI UNIVERSITY JOURNAL OF SCIENCE
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI)
  • Sayfa Sayıları: ss.79-85
  • Anahtar Kelimeler: Voellmy coefficients, Run-out distance, Avalanche dynamic, Uzungol
  • Gazi Üniversitesi Adresli: Evet

Özet

In this study, the traditional Voellmy model which has been widely applied since 1956 for all types of avalanches was used in defining the path length to compute the run-out distance of avalanches that occurred in Uzungol. Uzungol, a village which is located in a valley of North-Eastern Anatolia was chosen as a pilot project area since some fatal snow avalanches occurred in this area in the 1992 winter season. Due to limited data and field observations, dynamic and turbulence friction coefficients were taken as mu=0.155 and xi=500 m/s(2), respectively, for well defined slopes. Although it wasn't possible to check most of the computed values which need to be measured during an avalanche, the run-out distance was found to be determined quite accurately. A number of the Voellmy coefficients were tested to compute the run-out distance, and the effect of those coefficients on the hydraulic parameters of the avalanche, such as discharge, velocity and depth, was investigated.