نوع مقاله : پژوهشی

نویسندگان

1 استاد گروه ژئومورفولوژی دانشکده برنامه ریزی و علوم محیطی دانشگاه تبریز

2 دانشجوی دکتری گروه ژئومورفولوژی دانشکده برنامه ریزی و علوم محیطی دانشگاه تبریز

چکیده

هدف پژوهش حاضر ارزیابی و پهنه بندی مناطق مستعد سیلاب ناگهانی در حوضه براساس خصوصیات فیزیوگرافیک با بهره گیری از مدل شاخص پتانسیل سیلاب ناگهانی تصحیح شده (MFFPI) است. ابتدا بوسیله پارامترهای شیب ، تراکم جریان ، بافت خاک ، انحنای دامنه، کاربری اراضی و نفوذپذیری زمین و از طریق وزن دهی لایه ها، نقشه پتانسیل سیلاب ناگهانی تهیه شد. براساس نقشه اولیه پهنه بندی سیلاب استخراج شده، مناطق با پتانسیل خطر زیاد و متوسط به ترتیب 45/26 و 83/20 درصد از مساحت حوضه را در برگرفته اند. مناطق با خطر خیلی کم و کم سیلاب ناگهانی منطبق بر کوهستان و تپه های منطقه با درصد های 66/14 و 61/20 است. سپس بین پارامترها و نقشه پتانسیل سیلاب ناگهانی آزمون همبستگی اسپیرمن و رگرسیون خطی چند متغیره برقرار گردید که نتایج نشان داد که سه پارامتر شیب، کاربری اراضی و بافت خاک بیشترین تاثیر را دارند و لذا پارامتر های کم تاثیر در مرحله دوم حذف شدند و با پارامتر های تاثیر گذار نقشه نهایی پتانسیل سیلاب ناگهانی تهیه شد که نشان می دهد، مناطق با پتانسیل خطر خیلی کم از 66/14 درصد در نقشه اولیه پهنه بندی سیلاب به 81/22 درصد افزایش پیدا کرده است که عموما ارتفاعات حوضه را شامل می شود و مناطق با خطر زیاد و خیلی زیاد ( 84/25 و 85/20 درصد)، منطبق بر بستر اصلی رودخانه اوجان چای و مناطق هموار اطراف و دشت های رسوبی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment and zoning of flash flood risk in Ojan Chai basin by MFFPI model

نویسندگان [English]

  • Mohammad Hossein Rezaei Moghaddam 1
  • Fariba Karami 1
  • Kolson Abazari 2

1 Professor of Department of Geomorphology, Faculty of Planning and Environmental Sciences, University of Tabriz

2 Ph.D. student of Department of Geomorphology, Faculty of Planning and Environmental Sciences, University of Tabriz

چکیده [English]

Floods are one of the most destructive natural disasters that cause huge and frequent human losses ,financial and resource losses all over the world(Mishra & Sinha, 2020,1). Flash floods are caused by heavy rains and due to the sudden accumulation and release of runoff from upstream to downstream. This natural phenomenon is the result of the activity of two groups of different parameters. The first group is the meteorological features that change according to space and time. The second group of fixed parameters includes geomorphological and geological characteristics(Youssef et al, 2011,755).Therefore, identification and zoning of areas prone to flood risk is necessary for sustainable development planning and protection of human societies(Farhan & Ayed, 2017, 719). The Ojan Chai basin, which has been flooded in recent years, especially due to human intervention in basin system. One of the most unprecedented floods occurred in this basin in 2016. Therefore, according to the history of flooding in this basin, it is necessary to assess and zoning the risk of sudden flood. The aim of the current research is to evaluate and zoning flash flood-prone areas in the basin based on physiographic characteristics, which is the basis of the modified flash flood potential index (MFFPI).

کلیدواژه‌ها [English]

  • Flash Floods
  • MFFPI
  • Physiographic Parameters
  • Zoning
  • Ojan Chay
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