تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

پهنه بندی و ارزیابی پتانسیل وقوع زمین لغزش در حوضه آبریز کندیرق چای با استفاده از مدل ANP

نویسندگان
1 دانشیار ژئومورفولوژی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 دکتری ژئومورفولوژی، دانشگاه محقق اردبیلی، اردبیل، ایران
3 دانشجوی دکتری ژئومورفولوژی دانشگاه محقق اردبیلی، اردبیل، ایران
چکیده
در سالهای اخیر با افزایش خسارات ناشی از وقوع زمین­ لغزش، بشر در صدد کاهش زیان‌های آن برآمده است. بنابراین، با شناسایی مناطق مستعد زمین­ لغزش و رتبه ­بندی آنها می­توان تا حدودی از خطرات ناشی از رخداد این پدیده جلوگیری نمود. هدف این پژوهش شناسایی عوامل مؤثر در وقوع زمین­لغزش حوضه کندیرق چای و پهنه­ بندی این حوضه به لحاظ خطر رخداد زمین لغزش با استفاده از روش­های فرایند تحلیل شبکه می­باشد. در این راستا با توجه به مرفومتری حوضه و نیز نتایج پژوهش­های گذشته،١٠ عامل مؤثر در رخداد زمین‌لغزش‌های حوضه آبریز کندیرق چای شامل لیتولوژی، کاربری اراضی، بارش، شیب، جهت شیب، فاصله از جاده، فاصله از گسل و فاصله از آبراهه، شاخص قدرت آبراهه( SPI)و شاخص حمل رسوب(STI)، شناسایی و مورد استفاده قرار گرفتند. در ادامه جهت امتیازدهی به عوامل و معیارها و طبقه­بندی­ آنها از روش فرایند تحلیل شبکه‌ای ANPاستفاده شده است. بدین‌صورت که برای مقایسه و رتبه­ بندی پارامترها از فرایند تحلیل شبکه‌ای(ANP) استفاده ‌شده است. نقشه نهایی نشان دادکه حوضه از نظر زمین‌لغزش دارای ۴کلاس می‌باشد. نتایج نشان می­دهد که پهنه­ های با خطر کم و پهنه‌هایی با خطر زیاد دارای کمترین مساحت در سطح حوضه کندیرق‌چای هستند. از طرف دیگر پهنه­ های با خطر متوسط وخطر خیلی زیاد بیشترین مساحت حوضه را به خود اختصاص داده­اند. تطبیق سطوح لغزش یافته و پهنه­های مواجه با خطر نشان می­دهد که مناطقی که در رده خطر خیلی زیاد و متوسط قرار دارند دارای بیشترین مساحت از سطوح لغزشی هستند. به طوریکه پهنه با خطر خیلی زیاد ٣۵ درصد(٧٩ کیلومتر مربع) و پهنه با خطر زیاد٦/٣۲درصد(٧۲ کیلومترمربع) از زمین­لغزش­ها را به خود اختصاص داده اند. به عبارت دیگر بیش از٧٧ درصد زمین لغزش­ها با پهنه­های خطر خیلی زیاد و متوسط مطابقت دارند. همچنین عوامل سنگ­ شناسی، شیب و فاصله از آبراهه بیشترین تاثیر را در وقوع زمین ­لغزش داشته­اند. جهت انجام این کار از فرآیند تحلیل شبکه ANP استفاده خواهد شد.
کلیدواژه‌ها

عنوان مقاله English

Zoning and assessing the potential for landslide in the Shidri Chach basin using the ANP model

نویسندگان English

aghail madadi 1
ebrahim beheshti javid 2
nazfar aghazadeh 3
1 Associated professor of Geomorphology, university of Mohaghegh Ardabili
2 Phd of geomorphology , University of Mohaghegh Ardabili
3 Phd student of geomorphology , University of Mohaghegh Ardabili
چکیده English

During the last years, following an increase in damages due to occurrence of landslides, human has decided to reduce such losses. Therefore, identifying regions susceptible to landslide and classifying them can partly help man to prevent from happening above phenomena. The current study aims to demonstrate factors contributing to occurrence of landslide in Candrigh Chay basin and then, flattening the basin regarding risks related to landslide event using one methods, Network Analysis Process. In this direction, as respects to basin morphology and also, findings of past researches , ten factors involved in occurring landslides in Candrigh Chay Basin were recognized and used : lithology , land use , rainfall , slope , slope aspect , road slide , sluice power index (SPI), sediment transfer index (STI).Network Analysis Process(ANP) Method was implemented to score and classify factors and scales. Was carried out in order to measure classes of each parameter. The final map showed that the basin has 4 classes considering landslide. Findings reveal flats with low risk and flats with high risk have the least area in Candrigh Chay basin. On the other hand, flats with medium risk and high risk allocate the most area of basin for themself. Comparing slid surfaces with flats facing risks indicates regions located at high and average risk class possess most areas of slide surfaces so that a flat involving very high risk and a flat with high risk devote 35 percent (79km²) and 32/6 (72km²) of landslides for themselves, respectively. In other words, more than 77 percent of landslides conform to flats covering very high and average risk. Moreover, petrology, slope, and, sluice slide were identified as the most effective agents in occurring land_slides. One models, Network Analysis Process (ANP) were utilized through this project

کلیدواژه‌ها English

Landslide
Candrigh Chay
basin
ANP
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