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

Koçyigit, Önder; Gürer, Ibrahim
July 2007
Gazi University Journal of Science;Jul2007, Vol. 20 Issue 3, p79
Academic Journal
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 Uzungöl. Uzungöl, 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 μ= 0.155 and ξ= 500 m/s2, 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.


Related Articles

  • Relative elevations of meteorological facilities at South Pole Station. Warren, Stephen G.; Starbuck, Michael // Antarctic Journal of the United States;1993, Vol. 28 Issue 5, p271 

    Presents the result of a study on the relative elevations of meteorological facilities at South Pole Station. Measurement of infrared radiation spectra; Evaluation of the turbulent heat fluxes.

  • Stable Boundary Layer in Complex Terrain. Part I: Linking Fluxes and Intermittency to an Average Stability Index. Medeiros, Luiz E.; Fitzjarrald, David R. // Journal of Applied Meteorology & Climatology;Sep2014, Vol. 53 Issue 9, p2196 

    Average heat and momentum fluxes observed by a network of surface stations during the Hudson Valley Ambient Meteorology Study (HVAMS) were found as functions of a spatially representative bulk Richardson number Ribr. Preferential sites were identified for the occurrence of strong turbulence...

  • SOSA--a new model to simulate the concentrations of organic vapours and sulphuric acid inside the ABL--Part 1: Model description and initial evaluation. Boy, M.; Sogachev, A.; Lauros, J.; Zhou, L.; Guenther, A.; Smolander, S. // Atmospheric Chemistry & Physics;2011, Vol. 11 Issue 1, p43 

    No abstract available.

  • Estimating Crop Top Microclimates From Weather Station Data. Brown, R. D.; Gillespie, T. J. // Atmosphere -- Ocean (Canadian Meteorological & Oceanographic Soc;Mar1991, Vol. 29 Issue 1, p110 

    A mathematical model (MICROSIM) was developed to estimate the microclimate at the top of nearby crops using inputs of weather station data and some knowledge about crop characteristics, such as height, albedo, and leaf area index. The model was tested using data measured simultaneously over a...

  • Precision Irrigation Management In Apples. Robinson, Terence; Lakso, Alan; Dominguez, Leo // American Fruit Grower;May2013, Vol. 133 Issue 5, p18 

    The article offers information on Cornell Apple Irrigation Model, an improved mathematical model developed by Alan Lakso at the New York State Agricultural Experiment Station in Geneva, New York to calculate water use by apple trees. It describes the web-based tool developed in 2011 and 2012 to...

  • Surface Temperature Calculated By Using An Analytical Method. Ramezani, Iraj; Zamanian, Mohammad Taghi; Mousavi, Sayed Roholla // Australian Journal of Basic & Applied Sciences;2011, Vol. 5 Issue 8, p1269 

    A computer program was prepared using analytical method to calculate surface temperatures, and then we compared the surface temperature calculated by the computer and the actual surface temperature obtained from Aligoudarz meteorological stations (Iran). Result showed that in most cases there...

  • On the Remapping Procedure of Daily Precipitation Statistics and Indices Used in Regional Climate Model Evaluation. Diaconescu, Emilia Paula; Gachon, Philippe; Laprise, René // Journal of Hydrometeorology;Dec2015, Vol. 16 Issue 6, p2301 

    Gridded estimates of precipitation using both satellite and observational station data are regularly used as reference products in the evaluation of basic climate fields and derived indices as simulated by regional climate models (RCMs) over the current period. One of the issues encountered in...

  • The relationship between altitude of meteorological stations and average monthly and annual precipitation. Markos Gouvas; Nikolaos Sakellariou; Fotios Xystrakis // Studia Geophysica & Geodaetica;Oct2009, Vol. 53 Issue 4, p557 

    Abstract  The aim of this study was to prove that altitudinal variability of average monthly and annual precipitation is better summarised when the altitude observed within a radius of several kilometres around a meteorological station is taken into consideration, instead of the altitude...

  • Monthly trends and the corresponding altitudinal shift in the snowfall/precipitation day ratio. Serquet, Gaëlle; Marty, Christoph; Rebetez, Martine // Theoretical & Applied Climatology;Nov2013, Vol. 114 Issue 3/4, p437 

    A better understanding of the impact of changing temperatures on snow amounts is very important for the ski industry, but it is difficult to measure, particularly at different times of the snow season and not only on an annual or seasonal basis. Here, we analyze the snow day vs precipitation day...

  • A model of turbulence. Kadanoff, Leo P. // Physics Today;Sep95, Vol. 48 Issue 9, p11 

    Describes a model on the quantitative analysis of energy conservation in turbulent flow called K41 and K62. Production of complex structures from nonlinear interactions among fluid elements; Parameter for describing the complexity; Assumption of the energy current to be roughly constant;...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics