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تعیین حد سیل‌راه و حاشیه سیل رودخانه دینور با استفاده از مدل یک بعدی HEC-RAS | ||
| محیط شناسی | ||
| مقاله 1، دوره 50، شماره 3، آذر 1403، صفحه 263-280 اصل مقاله (2.35 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jes.2024.368707.1008458 | ||
| نویسندگان | ||
| رویا پناهی* ؛ محمد مهدی حسین زاده | ||
| گروه جغرافیای طبیعی، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران | ||
| چکیده | ||
| سیل یکی از متداول‌ترین و پرهزینه‌ترین بلایای طبیعی است که باعث ایجاد مشکلات شدید در بین مردم و خسارات اقتصادی شدید می‌شود. این مخاطره به عنوان یک نگرانی جهانی مطرح بوده است و ایران هم جزء چندین کشور در جهان است که با مشکلات شدید سیل در نواحی شهری و روستایی مواجه است. حفاظت از جان و مال افراد در مقابل مخاطره سیل وظیفه‌‌ای عمومی است که بر عهده دولت‌‌ها می‌‌باشد و همه کشورها برای مدیریت سیل و حفاظت از بستر رودخانه قوانین خاصی وضع کرده‌‌اند. هدف این پژوهش تعیین حد سیل‌راه و حاشیه‌‌سیل رودخانه دینور با استفاده از مدل یک بعدی HEC-RAS است. در مطالعه حاضر از مدل هیدرودینامیکی یک بعدی HEC-RAS ورژن (6/1) استفاده شده است و از طریق الحاق HEC–GEORAS در محیط GIS پردازش داده‌‌های ژئومتری انجام شد. جهت برآورد دبی پیک لحظه‌‌ای با استفاده از نرم‌‌افزار Hyfranدبی پیک لحظه‌‌ای محاسبه و پهنه سیلاب با دوره بازگشت‌‌های مختلف شبیه‌سازی شده است و سپس بر اساس 130 مقطع عرضی، پهنه مجاور رودخانه با توجه به افزایش تراز سیلاب 100 ساله به اندازه یک فوت دشت سیلابی به دو قسمت سیل‌راه و حاشیه سیلاب تقسیم‌‌بندی شده است در تعیین حد سیل‌راه از روش چهار (کاربر افزایش سطح آب هدف را مشخص می‌‌کند) استفاده شده است. نتایج حاصل این پژوهش نشان می‌‌دهد که در بازه اول حد سیل‌راه منطبق بر تراس‌‌های قدیمی رودخانه دینور بوده است. در بازه‌‌های دوم و سوم رودخانه دینور به دلیل کاهش محدودیت توپوگرافی، حد سیل‌راه گسترش پیدا کرده و در بازه دوم به حدود متوسط 300 متر و در بازه سوم تا 500 متر رسیده است. | ||
| کلیدواژه‌ها | ||
| پهنه‌‌بندی سیلاب؛ حاشیه سیل؛ رودخانه دینور؛ سیل‌راه | ||
| عنوان مقاله [English] | ||
| Determining the floodway and flood fringe of the Dinevar River using one-dimensional HEC-RAS model | ||
| نویسندگان [English] | ||
| roya panahi؛ Mohammad Mehdi Hosseinzadeh | ||
| Department of Geography, Faculty of Earth Sciences, University of Shahid Beheshti., Tehran, Iran | ||
| چکیده [English] | ||
| Flooding is one of the most destructive natural disasters that causes loss of life and financial problems in urban and rural areas. In addition, this risk is a concern worldwide, and Iran, like many countries, faces flooding problems in urban and rural areas. Protecting people's lives and property from floods is a duty assigned to governments, and countries have enacted specific laws to manage floods and protect riverbeds and riverbanks. This research aims to determine the flood limit and flood margin of the Dinevar River using the one-dimensional HEC-RAS model. First, geometric data was prepared with the help of HEC-GEORAS extension in GIS software. To estimate the instantaneous peak discharge, the instantaneous peak discharge was calculated using the Hyfran software and the flood zone was simulated with different return periods. Then, based on 130 cross-sections, the area adjacent to the river was divided into two parts: the floodway and flood fringe zones, based on the 100-year flood level increase of 1 foot. Method 4 (the user specifies target water level increase) was used to determine the floodplain limit. The results of this study showed that in the first reach, the floodplain limit coincided with the old terraces of the Dinevar River. In the second and third reaches of the Dinevar River, due to the reduction of topographic restrictions, the riverbed has expanded and reached to an average of 300 and 500 meters in the second and third reaches respectively. | ||
| کلیدواژه‌ها [English] | ||
| Dinevar River, Floodway, Flood fringe, Flood risk, Flood zoning | ||
| مراجع | ||
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