پديد آورنده :
دودانگه، اسماعيل
عنوان :
تحليل فراواني منطقه اي جريان حداقل در حوزه آبخيز سد سفيدرود
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
بيابان زدايي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي
صفحه شمار :
پانزده،147ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
سعيد سلطاني كوپايي
توصيفگر ها :
خشكسالي هيدرولوژيك , روش گشتاور L , روش هاي آماري چند متغيره
تاريخ نمايه سازي :
18/10/89
استاد داور :
جهانگير عابدي كوپايي، منيره فرامرزي
دانشكده :
مهندسي منابع طبيعي
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Regional Low Flow Frequency Analysis in Sefid Roud Basin Smaeel Dodangeh Smaeel dodangeh@gmail com October17 Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi S Soltani Ssoltani@cc iut ac ir Abstract Recently drought occurrences have imposed irreparable damages on human societies and natural ecosystems in Iran Due to significant socio economic damages droughts have received considerable attention from the researchers One of the most common indices which investigate occurrence probability of drought is low flow index In this study regional low flow frequency analysis is applied for a reliable estimation of low flow quantiles in ungauged sites To perform regional analysis of low flow 26 stations were selected and homogeneity of these stations was checked Homogeneity measures were employed on the 7 day annual minimum series as low flow index Results showed that the study area is definitely heterogeneous H1 13 68 To form homogenous regions Fuzzy Cluster Analysis FCA and multivariate techniques were used according to physiographic characteristics of subbasins Although the results of homogeneity test based on FCA method showed better results than multivariate techniques but homogeneity test was not acceptable for resulted clusters Therefore combination of 8 at site statistics and 5 at site characteristics of the selected stations were used together for homogenous cluster formation Applying hierarchical cluster separated basin into the eastern and western parts Removing of Gilvan Yengikand and Firooz abad stations from western part homogeneity test revealed that two separated parts are homogenous In continue Pearson III and Generalized logistic distributions were selected as the robust regional distributions based on ZDist criteria Then at site low flow statistics as dependent variables and physiographic and land use characteristics as independent variables were used to establish regional low flow models According to these models drainage area average basins slope and land use characteristics were identified as important factors in low flows features as hydrological drought index On the other hand uncertainty analysis of two types of regression models was performed using asymptotic approximation and Bayesian analysis According to uncertainty analysis 95 confidence intervals are remarkably reduced using the Bayesian approach Finally results showed that 2 parameters distributions are fitted for upstream regions with small sample sizes Keywords Hydrological drought Regional frequency analysis L moments multivariate techniques
استاد راهنما :
سعيد سلطاني كوپايي
استاد داور :
جهانگير عابدي كوپايي، منيره فرامرزي
