پهنه‌‌بندی و پایش خطر سیل بهار 1398 خوزستان با استفاده از داده های لندست-8

نوع مقاله : پژوهشی

نویسندگان

1 استاد گروه مهندسی علوم آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی ساری

2 دانشجوی کارشناسی ارشد سنجش از دور و سیستم اطلاعات جغرافیایی، مؤسسۀ آموزش عالی آبان هراز آمل

چکیده

‌پایش و پهنه‏بندی سیلاب کارکرد زیادی در کاهش خسارت‌های ناشی از آن دارد. هدف از مقالۀ حاضر، بررسی خطر سیل فروردین 1398 خوزستان با استفاده از داده‌های لندست-8 است. ابتدا پیش‏پردازش تصاویر در نرم‏افزار ENVI 5.3 انجام شد. سپس، برای پایش سیل فروردین 1398 از شاخص‏های MNDWI و NDWI استفاده شد. پس از آن، نقشۀ پهنۀ‏ خطر سیل در نرم‏افزار ArcGIS10.4 تهیه شد. نتایج نشان می‏دهد بخش‏های جنوب و جنوب غربی از وضعیت خیلی شدید و بخش‏های مرکزی و جنوب شرقی از وضعیت شدید خطر سیل برخوردارند که از مستعدترین نواحی سیل‏گیر در استان هستند. همچنین، پایش نقشه‏های سیل در استان خوزستان نشان می‏دهد که یک انطباق کامل بین نقشۀ پهنه‏بندی سیل و سیل اخیر وجود دارد. به‏طوری ‏که با بررسی نقشه‏ها مشخص شد که سیل اخیر بیشتر در بخش‏های غرب، جنوب و جنوب غربی اتفاق افتاده است. بررسی مکانی نواحی سیلابی نشان می‏‏دهد شهرهای هویزه، دشت آزادگان، اهواز، خرمشهر، بندر ماهشهر، آبادان و به‌خصوص شادگان بیشتر از دیگر شهرها دچار سیل شده‏اند. در این میان، شهر شادگان بر اساس شاخص‏های MNDWI و NDWI به‌ترتیب 191349 و 174813 هکتار از اراضی آن تحت تأثیر سیل بوده است که بیشترین میزان نسبت به دیگر شهرهای استان را نشان می‌دهد. به‏طور کلی، با توجه به نتایج، استفاده از داده‌های سنجش‏ازدور و شاخص‏های MNDWI و NDWI برای پایش سیل و همچنین، استفاده از سیستم اطلاعات جغرافیایی به منظور پهنه‏بندی نواحی خطر سیلاب در مطالعات مرتبط پیشنهاد می‏شود.

کلیدواژه‌ها


عنوان مقاله [English]

Zoning and Monitoring of Spring 2019 Flood Hazard in Khuzestan Using Landsat-8 Data

نویسندگان [English]

  • Karim Solaimani 1
  • Shadman Darvishi 2
1 Professor, Deptrtment of Watershed Management, Sari Agriculture, Science and Natural Resources University, Sari, Iran
2 M.Sc. Student of Remote Sensing & GIS, Higher Education Institute of Haraz, Amol, Iran
چکیده [English]

Flood monitoring and zoning play an important role in reducing the damage caused by this natural crisis. The purpose of this paper is to investigate the risk of flooding of April 2019 in Khuzestan using Landsat-8 data. First, image processing was performed in ENVI 5.3 software and then MNDWI and NDWI indices were used to monitor the floods. Then, the flood hazard map was prepared in ArcGIS10.4 software. The results show that the southern and southwestern parts of the province are in a very severe situation and the central and southeastern parts are in a very hazardous condition, which is one of the most prone flood areas in the province. Also, monitoring of flood maps in Khuzestan province shows that there is a complete similarity between the recent flood and flood zoning map. Examination of the maps showing that the recent floods occurred mostly in the western, southern and southwestern parts. Spatial survey of floodplain areas shows that the cities of Hoveyzeh, Azadegan Plain, Ahvaz, Khorramshahr, Bandar Mahshahr, Abadan and especially Shadegan have been flooded more than other cities. Meanwhile, Shadegan city has been affected by floods based on MNDWI and NDWI indices of 191349 and 174813 hectares, respectively, which shows the highest rate compared to other cities in the province. In general, according to the results, the use of remote sensing data and MNDWI and NDWI indices for flood monitoring, as well as the use of geographic information system for flood risk zoning in related studies are recommended.

کلیدواژه‌ها [English]

  • flood zoning
  • MNDWI
  • NDWI
  • Landsat 8 and Khuzestan
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