An Algorithm for Selecting the Effective Distance of the Wind Shelter to Verify the Wind Shelter Status at the Lake Level of Dams (Case Study: Lake of Dez Reservoir Dam)

• Main Authors: zahra shahi, Mohammad Reza Sharifi
• Format: Article
• Language: fas
• Published: Shahid Chamran University of Ahvaz 2018-04-01
• Series: علوم و مهندسی آبیاری
• Subjects: wind; free water level; wind shelter index; effective distance wind shelter; dez dam reservoir
• Online Access: http://jise.scu.ac.ir/article_13578_c8b8804d4ac6e0e58ea4e18b26da25c7.pdf
• ISSN: 2588-5952; 2588-5960

To calculate the wind shelter index (<em>Sx</em>) for points in a region, the wind shelter index values are calculated for each set of points in different lengths and directions. Among these lengths, the length of the <em>Sx</em> corresponding to it has the highest wind shelter and is known as an effective length. Winstral <em>et al.</em> (2002), Winstral and Marks (2002), Erickson <em>et al. </em>(2005), Molotch <em>et al.</em> (2005), Molotch and Bales (2006), Sharifi <em>et al.</em> (2007), Litaor <em>et al.</em> (2008), Tabari <em>et al.</em> (2009) and Maroufi <em>el al.</em> (2010) in order to determine the effective length in snowy areas inevitably used the correlation of <em>Sx</em> values for each desired length and depth of snow. Winstral <em>et al.</em> (2009) in study of wind speed distribution methods  determined the effective length by establishing the relationship between the difference in the values of the <em>Sx</em> and the difference in the velocity of the wind. Farokhzadeh <em>et al.</em> (2014) also succeeded in determining the effective length by examining the correlation between a parameter named average wind shelter slope and <em>Sx</em>, provided that the selected points were in wind conditions. Therefore, due to the limitation in the method proposed by Farokhzadeh <em>et al.</em> (2014) for calculating the <em>Sx</em> in non-snow areas such as lake levels, the use of a specific type of algorithm for determining the effective wind shelter length seems necessary (Shahi, 2017). Therefore, in this study, according to the existing conditions, a method was proposed for selecting the effective length of the shelter.