پديد آورنده :
فضل الهي، عاطفه
عنوان :
بررسي اثر برهم كنش پوشش گياهي ديواره ها و شكل بستر مقعر بر ساختار جريان
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
سازه هاي آبي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
سيزده،122ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
حسين افضلي مهر، منوچهر حيدرپور
استاد مشاور :
اسماعيل لندي
توصيفگر ها :
تنش رينولدز , جريان يكنواخت
تاريخ نمايه سازي :
4/2/92
استاد داور :
محمد شايان نژاد، احمد ميره اي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Effect of vegetated banks and concave bedform pool on flow structure Atefeh Fazlollahi a fazlolahijonaghani@ag iut ac ir 19January 2013 Departement of water engineering Isfahan University of Technology Isfahan 84156 83111 Iran Language Farsi Degree M Sc H AfzaliMehr hafzali@cc iut ac ir M Heidarpour Heidar@cc iut ac ir Abstract Bed forms and vegetated banks play significant roles on flow structure natural streams and rivers However the impact of bank vegetation on flow structure in a range of river environments included bed forms seem to remain unexplored The objective of present research is to investigate the interaction of pools and vegetated banks on turbulent intensities and Reynolds stresses in a narrow flume Laboratory experiments were conducted in a flume of 8 m long 0 4 m wide and 0 6 m deep ADV was used to measure flow velocity in 3D with a sampling frequency 200 Hz The channel bed form was covered by gravel with a median size of 10 mm Also the flume walls were covered by rice stems The experiments were carried out for four crest slopes two aspect ratios and ten runs included vegetated and bare banks Results revealed that the effect of crest slope change in decelerating flow is more important than that in accelerating flow For angles of 15 and 20 degrees the negative values for velocity were observed leading to reversal flow flow separation Vegetated banks not only increased the Reynolds stress values but also generated the negative values near the water surface Quadrant analysis illustrated that the negative values were due to inward and outward contributions Small aspect ratio caused maximum Reynolds stress occurs near the bed however with increasing aspect ratio the maximum values of Reynolds stress and turbulent intensities moved toward the water surface Key words Bed forms pool Reynolds stress vegetated banks flow structure quadrant analysis
استاد راهنما :
حسين افضلي مهر، منوچهر حيدرپور
استاد مشاور :
اسماعيل لندي
استاد داور :
محمد شايان نژاد، احمد ميره اي
