ارزیابی منطقه‌ای مخاطرۀ سیل در مقیاس زیرحوضه با استفاده از سنجش از دور و مدل منطق فازی (مطالعۀ موردی: حوضۀ آبخیز مرند)

نوع مقاله : پژوهشی

نویسندگان

1 کارشناسی ارشد سنجش از دور و GIS، دانشگاه تبریز

2 استاد گروه سنجش از دور و GIS، دانشکدۀ برنامه‌ریزی و علوم محیطی، دانشگاه تبریز

3 استادیار گروه آب و هواشناسی، دانشکدۀ برنامه‌ریزی و علوم محیطی، دانشگاه تبریز

چکیده

ازجمله مهم‌ترین مخاطرات تهدیدکنندۀ جوامع بشری سیل است. در پژوهش حاضر با یکپارچه‌سازی مدل منطقی برآورد رواناب اوج، به ارزیابی مخاطرۀ سیل حوضۀ آبخیز مرند در مقیاس زیرحوضه با استفاده از سنجش از دور و GIS پرداخته شده است. پس از تعیین ضریب رواناب با استفاده از لایه‏های پوشش/کاربری اراضی تهیه‌شده از تصاویر ماهوارۀ Sentinel 2A، نقشۀ شیب تهیه‌شده از DEM 30 متری سنجندۀ ASTER و گروه‏های هیدرولوژیک خاک، با استفاده از میزان تعیین‌شده که با محاسبۀ زمان تمرکز زیرحوضه‏ها تعیین شد، رواناب اوج برای همۀ زیرحوضه‏ها محاسبه شد. در ادامه، با استفاده از تابع عضویت خطی در مدل منطق فازی، یکپارچه‌سازی دو لایۀ رواناب اوج‏ تهیه شده و لایۀ ارتفاع، بین صفر و یک فازی‏سازی شدند و سپس با اعمال همپوشانی ضربی وزن‏های مشخص براساس شاخص مخاطرۀ سیل (FHI)، به هریک از این دو لایه و سپس جمع نتایج آنها، نقشۀ توزیع مخاطرۀ سیل تهیه شد. با کلاس‏بندی نقشۀ مخاطرۀ تهیه‌شده در پنج کلاس شامل بسیار کم‏خطر، کم‌خطر، متوسط، پرخطر و بسیار پرخطر با نتایج به‌دست‌آمده از سیستم اطلاعات جغرافیایی مشارکتی یا PGIS و ورود این اطلاعات به ماتریس درهم‌ریختگی میزان دقت نقشه‏های تهیه‌شده 83/87 درصد تعیین شد.

کلیدواژه‌ها


عنوان مقاله [English]

Regional Flood Hazard assessment at the Sub-basin Scale Using Remote Sensing & Fuzzy logic

نویسندگان [English]

  • SeidMohamad Mousavi 1
  • Shahram Roostaei 2
  • Hashem Rostamzadeh 3
1 University of Tabriz
2 Head of the Faculty of Planning and Environmental Sciences, Tabriz University, Tabriz, Iran.
3 Department of Climatology, Faculty of Planning and Environmental Sciences, Tabriz University, Tabriz, Iran
چکیده [English]

Flood is among the most important environmental hazards, broadly threatening human societies and their assets. In this research, by integrating the Rational model to estimate peak runoff into Marand basin flood hazard on a sub-basin scale, assessments are accomplished using remote sensing and GIS. After determining the runoff coefficient land cover/use layers were taken from satellite images of the Sentinel 2A, and the slope map was derived from the ASTER DEM 30m and soil hydrological groups, using the specified amount of rainfall hamely intensity in mode of 1-hour peak runoff was calculated. Using linear membership function in fuzzy logic model, integrating prepared this peak runoff and elevation lines between zero and one were fuzzy and then by applying multiple weight tangles to each of these two layers we collected their results, and the flood hazards distribution map was prepared. With the implementation of prepared risk map in fifth grade the classes include very low-risk, low risk, medium, high and very high risk with the results of GIS partnership or PGIS and entering this information into the confusion matrix. The accuracy of prepared maps was determined to be about 87.83%.

کلیدواژه‌ها [English]

  • Flood hazard
  • Sentinel 2A
  • Fuzzy logic
  • Marand basin
  • PGIS
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