تحلیل مکانی مقدار زمین‌لغزش با استفاده از روش تداخل‌سنجی راداری به‌منظور کاهش مخاطرات (مطالعۀ موردی: منطقۀ سرباز در استان اصفهان)

لغزش‌ها از پدیده‌های بسیار پیچیده و در عین‌حال زیانبار به‌شمار می‌آیند که در اثر وقوع آنها مواد دامنه‌ای از سطوح شیبدار جابه‌جا می‌شود و زخم‌های به‌نسبت عمیقی در دامنه‌ها بر جای می‌ماند. وقوع چنین پدیده‌ای در نزدیکی عوارض فرهنگی مانند مناطق مسکونی، جاده‌ها و غیره موجب آسیب‌های مالی و تلفات جانی فراوان می‌شود. استفاده از سیستم‌های اطلاعات جغرافیایی در درجه اول و در پی آن، استفاده از فناوری تحلیل تصاویر ماهواره‌ای، در این بخش از مدیریت بسیار کمک‌کننده است. تداخل‌سنجی راداری d-insar با برخورداری از پوشش زمینی وسیع مکرر، پیوسته و نیز قدرت تفکیک زمانی و مکانی زیاد، از دقیق‌ترین و کم‌هزینه‌ترین فنون سنجش از دور است که برای نمایش جابه‌جایی‌های پدیدآمده در سطح زمین ارائه شده است. پژوهش حاضر به بررسی وجود زمین‌لغزش‌ها در محدودۀ پژوهشی روستای سرباز به کمک تصاویر راداری سنجندۀ سنتینل 1 و با استفاده از روش تداخل‌سنجی راداری در دورۀ زمانی 2017 و 2018 پرداخته است. پس از پردازش‌های مختلف در نرم‌افزار envi و افزونۀ sarscape، اندازۀ جابه‌جایی و زمین‌لغزش منطقه به‌دست آمد. با توجه به نتایج می‌توان گفت منطقۀ سرباز از نظر زمین‌لغزش فعال است. همچنین سه نقطه به‌منزلۀ نقاط حساس معرفی شدند که مشخص شد در محدودۀ خطر متوسط رو به زیاد قرار دارند. نتایج نشان داد که منطقۀ سرباز در دورۀ 2017/06/05 تا 2017/12/14، دارای 0.069- جابه‌جایی یعنی نزدیک به 7 سانتی‌متر، در دورۀ 2017/12/14 تا 2018/06/12 دارای 0.035- جابه‌جایی یعنی نزدیک به 4 سانتی‌متر و در دورۀ 2018/06/12 تا 2018/12/21 دارای 0.064- جابه‌جایی یعنی 6 سانتی‌متر بوده است. در پایان نقشۀ نقاط حساس تهیه و ارائه شد.

spatial analysis of the amount of landslides using radar interferometric technique in order to reduce hazards (study area: sarbaz area in isfahan province)

introductionlandslides are one of the most complex and at the same time harmful phenomena, as a result of which the slope material is moved from the sloping surfaces and relatively deep wounds are left on the surface of the slopes. a phenomenon near cultural features, such as residential areas, roads, etc., causes financial damage and many casualties. the use of geographic information systems in the first place, followed by the use of satellite image analysis technology, is of great help to this part of management. for this purpose, the d-insar radar interferometry technique, with its frequent, continuous wide ground coverage and high temporal and spatial resolution, as one of the most accurate and least expensive remote sensing techniques, to display the displacements that occur in the ground surface is provided. the present study investigated the existence of landslides in the study area of sarbaz village by means of sentinel 1 sensor radar images and using radar interferometric technique in the period of 2017 and 2018. after various processes that were done in envi software and sarscape plugin, the amount of displacement and landslide of the area was obtained, and according to the results obtained, it can be said that sarbaz area is an area with a high level of activity in terms of landslides. also, 3 points have been introduced as points with high sensitivity, which were found to be in the medium to high risk level. the obtained results showed that sarbaz region had a displacement of -0.069 in the period of 06/05/2017 to 12/14/2017, in fact it had a displacement of nearly 7 cm, in the period of 12/14/2017 to 12 in 06/2018, the amount of displacement was -0.035, which means that nearly 4 centimeters of displacement occurred in the region, and between 12/06/2018 and 21/12/2018, the displacement in the region was equal to -0.064, which it shows that there has been 6 cm displacement in the studied area during this time period. at the end, a map of sensitive points was prepared and presented.deformation of the soil surface is a dynamic process on the earth’s surface, this process occurs naturally or due to human intervention. one of the forms of this deformation is landslide [7]. the definition of landslide is the general and deep movements of the entire soil layer on the surface of the mother earth, which cause heavy damages every year, sometimes it is not possible to compensate for these damages, and we need to spend a lot of time and money. the speed of their operation and their extent often creates spectacular and sometimes catastrophic phenomena, and they may affect tens or hundreds of thousands of cubic meters of rock and soil in one place. this phenomenon works mostly in isolated sediments [10]. the effects of domain instability are mass movements on a small to large scale. range movements may be minor and unique to the fall of a single piece of rock, or they may be very large and catastrophic. the damage caused by this type of movement is more in developed countries, but 95% of the deaths caused by it happen in developing countries. landslides are among the most devastating natural disasters in steep areas, the damage to residential areas and economic infrastructure, as well as human casualties caused by landslides are increasing worldwide [9]. iran, with its mainly mountainous topography, tectonic activity and high seismicity, diverse geological and climatic conditions, has the main natural conditions for creating a wide range of landslides