7469

6975

كارشناسي ارشد

آب

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1391

نه، 154ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

آزاده احمدي، حميدرضا صفوي

1/11/91

سعيد سلطاني كوپايي، رضا جعفري

1396/09/22

كتابنامه

عمران

مهندسي عمران

ID6975

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Investigation of climate change impacts on snow runoff process Case study ZayandeRood river basin upstream Amin Khoramian a khoramian@cv iut ac ir 9 16 2012 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr A Ahmadi aahmadi@cc iut ac ir Dr H R Safavi hasafavi@cc iut ac ir Abstract Snow is one of the main water balance element in a river basin Snow is a major part of precipitation and consequently the snow melting is the main resource for runoff in spring and summer Runoff caused by snow melting is important resources for water demands including domestic agricultural industrial and environmental and sometimes destructive floods Therefore the accurate recognition of the temporal and local snow properties is important to have a correct and effective management in water resources In this thesis the impacts of climate change on snowmelt runoff process in upstream of Zayanderood river basin has been studied For this purpose daily and eight days MODIS snow cover products have been used to monitor snow cover changes in the case study area In order to preprocessing the daily and eight days maximum snow cover MODIS products are evaluated using of observed land data in GIS environment The results indicate that accuracies of daily snow product in overall and clear sky conditions and eight day product are 73 37 92 05 and 84 18 respectively Snowmelt runoff process modeled in both two sub basins utilizing extracted snow cover the temperature the precipitation and SRM model parameters The modeling results indicate acceptable performance of SRM in two case study sub basins To evaluate the impacts of climate change on snowmelt procedure effects of climate change on the precipitation and the temperature as two effective factors in the snowmelt process has been assessed The HadCM3 GCM model and SDSM downscaling model have been used to aim climate change affected temperature and precipitation under A2 and B2 emission scenarios GCM downscaled outputs show a considerable increasing trend in the temperature up to 4 9 for Singerd climatologic station and up to 3 46 for Badijan climatologic station Also a decreasing trend in precipitation over case study area has been predicted but this trend is not significance Finally using GCM downscaled outputs and the developed snowmelt model the future runoff in two periods of 2011 2040 as near future and 2071 2099 as far future under climate change condition are evaluated Results show that yearly runoff will decrease and seasonally winter runoff will increase also the seasonally runoff in spring will significantly decrease Simulation results indicate that peak of discharges will move from March and April to December and January and peak discharge values will decrease Keywords Snowmelt Climate Change MODIS SRM Zayanderood River Basin

آزاده احمدي، حميدرضا صفوي

سعيد سلطاني كوپايي، رضا جعفري