نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد بیابانزدایی، دانشکده آب و خاک، دانشگاه زابل
2 استادیار، دانشکده آب و خاک، دانشگاه زابل
3 دکتری منابع آب، پژوهشکده تالاب بین المللی هامون، دانشگاه زابل
چکیده
سیلاب هر ساله باعث تخریب ساختار اقتصادی و اجتماعی جوامع و خسارات مالی و جانی فراوانی میشود. یکی از عوامل موثر در بروز سیلابها توسعه شهرنشینی در اطراف رودخانهها میباشد. در اثر تغییرات اقلیمی، طی دهههای اخیر، استان سیستان و بلوچستان با آب و هوای گرم و خشک، مستعد وقوع پدیده سیل بوده است. هدف از پژوهش حاضر، پهنهبندی سیلاب حوزه آبخیز سرباز با استفاده از مدل هیدرولیکی HEC-RAS میباشد. برای انجام پژوهش، ابتدا با توجه به تصاویر ماهوارهای، نقشه کاربری اراضی و شماره منحنی رواناب، مدل SCS منطقه تعیین شد. در ادامه، دبی سیلاب حوضه با دوره بازگشتهای 10، 25، 50 و 100 ساله با استفاده از مدل هیدرولوژیکی HEC-HMS شبیهسازی شد. نتایج شبیهسازی بهترتیب منجر به وقوع دبیهای اوج سیلاب با میزان 3376.8، 4563.7، 5462.4 و 6359.3 متر مکعب بر ثانیه برای دوره بازگشتهای 10، 25، 50 و 100 ساله در حوضه مورد مطالعه شد. بهمنظور ارزیابی کارایی مدل در مرحله واسنجی و اعتبارسنجی از شاخصهای ارزیابی نش-ساتکلیف و مجذور میانگین مربعات خطا استفاده شد که نتایج آنها حاکی از کارایی مطلوب مدل است. در ادامه، نقشه پهنهبندی سیلاب حوزه آبخیز سرباز محدوده شهر راسک با دوره بازگشتهای مورد نظر با کمک مدل هیدرولیکی HEC-RAS تهیه شد. نتایج نشان داد که با دوره بازگشتهای 10، 25، 50 و 100 ساله بهترتیب 366.86، 397.12، 449.95 و 580.78 هکتار مساحت پهنه سیلاب حوزه آبخیز سرباز محدوده شهر راسک افزایش مییابد.
کلیدواژهها
عنوان مقاله [English]
Flood hazard zonation using HEC-RAS hydraulic model in Sarbaz River, Sistan and Baluchestan Province
نویسندگان [English]
- Sakineh Damadi 1
- Abdolhamid Dehvari 2
- Mohammad reza Dahmardeh ghaleno 2
- Mahboobeh Ebrahimiyan 3
1 MSc Student , Faculty of Water and Soil, University of Zabol, Iran
2 Assistant Professor, Faculty of Water and Soil, University of Zabol, Zabol, Iran
3 PhD, University of Zabol, Zabol, Iran
چکیده [English]
Every year, floods destroy the economic and social structure of communities and cause a lot of financial and human losses. One of the effective factors in the occurrence of floods is the development of urbanization around rivers. Due to climate change, in recent decades, Sistan and Baluchestan Province with hot and dry climate, is prone to floods. The aim of the present study is to zoning the flood of Sarbaz Watershed using HEC-RAS hydraulic model. To conduct the research, the SCS model of the area was first determined according to satellite images, land use map and runoff curve number. Then, the flood discharge of the basin with 10, 25, 50 and 100 years return periods was simulated using the HEC-HMS hydrological model. The simulation results resulted in the occurrence of peak flood discharges of 3363.8, 4563.7, 54462 and 6359.3 m3s-1 for return periods of 10, 25, 50 and 100 years in the study basin, respectively. In order to evaluate the efficiency of the model in calibration and validation stage, Nash-Sutcliffe evaluation indices and the mean square error were used, the results of which indicate the optimal performance of the model. Then, the flood zoning map of Sarbaz Watershed in Rusk City was prepared in desired return period with the help of HEC-RAS hydraulic model. The results showed that with the return periods of 10, 25, 50 and 100 years, 366.86, 397.12, 449.95 and 580.78 hectares of flood zone of Sarbaz Watershed in Rask City area will increase, respectively.
کلیدواژهها [English]
- Discharge
- Return period
- Riparian zone
- Runoff
- Watershed management
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