تحلیل فضایی مخاطرات محیطی

تحلیل فضایی مخاطرات محیطی

ارزیابی حساسیت مخاطره زمین‌لغزش با استفاده از مدل انتروپی شانون در زاگرس چین-خورده، مطالعه موردی: حوضه آبخیز ورن سرا

نویسندگان
عبدالمجید احمدی 1
عبدالکریم ویسی 2
1 دانشگاه رزی گروه جغرافیا
2 دانشگاه تهران
10.61186/jsaeh.10.1.127
چکیده
مخاطره زمین­ لغزش خسارات قابل توجهی به اموال، موجودات زنده و پروژه ­های مهندسی در همه مناطق کوهستانی وارد می­کند. هدف از این پژوهش ارزیابی عوامل مؤثر در وقوع زمین ­لغزش و تهیه نقشه حساسیت آن در حوضه آبخیز ورن­سرا می­باشد. به منظور پهنه­ بندی خطر زمین ­لغزش با استفاده از شاخص انتروپی، ابتدا محدوده ­های لغزش مشخص گردید، سپس عوامل مؤثر در وقوع حرکات دامنه­ای در محیط نرم ­افزار ArcGIS تهیه و نقشه حساسیت زمین‌لغزش منطقه موردمطالعه تهیه گردید. اولویت ­بندی عوامل مؤثر با استفاده از شاخص انتروپی شانون نشان داد که لایه ­های شیب، کاربری اراضی، انحنای سطح، شاخص رطوبت توپوگرافی و شاخص موقعیت توپوگرافی بیشترین تأثیر را در وقوع زمین‌لغزش منطقه داشته اند. همچنین پهنه ­بندی حساسیت زمین­لغزش با مدل مذکور و ارزیابی دقت آن با استفاده از منحنی ROC بیانگر دقت خیلی خوب مدل (6/79 درصد) با انحراف استاندارد 0228/0 برای منطقه موردمطالعه است. نقشه پهنه­ بندی گویای آن است که پهنه ­های کم­ خطر فقط 13 درصد از منطقه را در برمی­گیرند و بیش از 56 درصد منطقه در پهنه با خطر زیاد زمین‌لغزش قرار دارد که حاکی از پتانسیل بالای منطقه در رخداد زمین­لغزش است. ساخت و ساز با فاصله از خطوط گسلی، آبراهه­ها و سازند آسماری پرشیب و ایمنی مسیرهای ارتباطی مهم­ترین اقدامات برای کاهش میزان خسارات ناشی از زمین‌لغزش در حوضه آبخیز ورن­سرا است.
کلیدواژه‌ها
مخاطرات طبیعی
زمین‌لغزش
انتروپی
زاگرس چین‌خورده

عنوان مقاله English

Landslide susceptibility assessment Using Shannon Entropy Model in Folded Zagros, Case Study: Varansara basin

نویسنده English

abdolmajid ahmadi 1
چکیده English

Extended abstract

Landslide risk zoning is one of the basic measures to deal with and reduce the effects of landslides. Vernesara watershed is one of the areas where many landslides have been observed in different parts of it. In this research, in order to zone the risk of landslides using the entropy index, first the ranges of landslides were determined, then the effective factors in the occurrence of range movements were prepared in the ArcGIS software environment, and a landslide susceptibility map of the studied area was prepared. . The prioritization of effective factors using Shannon's entropy index showed that the slope layers, land use, surface curvature, topographic humidity index and topographic position index had the greatest effect on the occurrence of landslides in the region. Also, zoning landslide sensitivity with the mentioned model and evaluating its accuracy using the ROC curve shows the very good accuracy of the model (79.6 percent) with a standard deviation of 0.0228 for the studied area. The zoning map shows that the low-risk areas cover only 13% of the area and more than 56% of the area is in the area with high risk of landslides, which indicates the high potential of the area in the occurrence of landslides. . Construction at a distance from fault lines, waterways and the steep Asmari Formation and safety of communication routes are the most important measures to reduce the amount of damage caused by landslides in Vernesara watershed.

Key words: natural hazards, landslide, entropy, folded Zagros.

کلیدواژه‌ها English

Natural hazards
Landslides
Entropy
folded Zagros
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