پژوهشهای ژئومورفولوژی کمّی

پژوهشهای ژئومورفولوژی کمّی

تحلیل فرکتالی آشفتگی هندسی میکروفرم‌های گلی در دشت اشتهارد با استفاده از مدل محیط–مساحت

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشکده جغرافیا، دانشگاه خوارزمی، تهران، ایران
2 دانشکده جغرافیا، دانشگاه خوارزمی، تهران، ایران.
3 دانشیار گروه ژئومورفولوژی، دانشکده جغرافیا، دانشگاه خوارزمی، تهران، ایران
10.22034/gmpj.2025.542549.1577
چکیده
دشت ها، دریاچه های کویری، پلایاها و لندفرم های مشابه آن در بسیاری از مناطق خشک و نیمه خشک، در نتیجه فعالیت های انسانی دچار اختلال و آشفتگی شدند دشت اشتهارد به‌عنوان یکی از این محیط‌های حساس، با توجه به فرآیندهای ژئومورفولوژیکی فعال و تغییرات سطحی پویا، نیازمند تحلیل‌های کمّی نوین برای درک الگوهای آشفتگی سطحی است. تحت تأثیر فرآیندهای ژئومورفولوژیکی فعال و تغییرات سطحی، از حساسیت بالایی برخوردار است. هدف این پژوهش، تحلیل الگوی هندسی و میزان آشفتگی میکرولندفرم‌های گلی در دشت اشتهارد با بهره‌گیری از مدل فرکتالی محیط–مساحت به عنوان یک ابزار شبیه سازی آشفتگی های ناپایدار سطحی است. این منطقه با وجود دارا بودن ویژگی‌های ژئومورفولوژیکی منحصربه‌فرد، تاکنون مطالعه فرکتالی مستقلی را به خود ندیده است به همین منظور، طی زمستان ۲۰۲۴، از ۴۰۳ میکروفرم سطحی تصویربرداری شد که از میان آن‌ها، ۲۰۸ فرم با مرزهای مشخص انتخاب و مساحت و محیط آن‌ها با دقت اندازه‌گیری شد. سپس با استفاده از رابطه لگاریتمی محیط و مساحت، بعد فرکتالی (DAP) برای هر فرم محاسبه و تحلیل شد. نتایج نشان داد مقادیر DAP در محدوده ۱.۶۰ تا ۱.۹۰ قرار دارند که بیانگر سطح بالای آشفتگی هندسی و پیچیدگی ساختاری در منطقه است. مقدار میانگین DAP برابر با ۱.۷۵ و ضریب همبستگی بالا (بیش از ۰.۹۶)، حاکی از اعتبار بالای مدل و تطابق داده‌ها با شرایط ناپایدار منطقه است. این الگوها بازتابی از تحول پویای سطح زمین و ناپایداری‌های ژئومورفولوژیکی در دشت اشتهارد به شمار می‌روند و می‌توانند به‌عنوان شاخصی مؤثر در مطالعات مخاطرات محیطی و تغییرات اکولوژیکی مورد استفاده قرار گیرند.
کلیدواژه‌ها

عنوان مقاله English

Fractal Analysis of Geometric Turbulence in Clay Microforms of the Eshtehard Plain Using the Perimeter-Area Model"

نویسندگان English

rana norouzi 1
Sayyd Morovat Eftekhari 2
Ali ahmadabadi 3
1 Faculty of Geographical Sciences, University of Kharazmi Tehran, Iran.
2 Assistant Professor of Natural Geography, Faculty of Geographical Sciences, kharazmi University, Tehran, Iran
3 Associate Professor of Natural Geography, Faculty of Geographical Sciences, kharazmi University, Tehran, Iran.
چکیده English

Deserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities. Among these, the Eshtehard Plain, identified by the Ministry of Energy's reports as one of the critically restricted plains due to its groundwater resource conditions, is highly sensitive to active geomorphological processes and surface changes. This study aims to analyze the geometric patterns and degree of turbulence in clay microforms of the Eshtehard Plain using the perimeter-area fractal model as a tool for simulating unstable surface disturbances. This region, due to its unique geomorphological characteristics, has not previously been independently subjected to fractal analysis. To this end, during the winter of 2024, 403 surface microforms were imaged, of which 208 with distinct boundaries were selected, and their area and perimeter were precisely measured. The fractal dimension (DAP) for each form was calculated and analyzed using the logarithmic relationship between perimeter and area. The results showed that DAP values range from 1.60 to 1.90, indicating a high level of geometric turbulence and structural complexity in the region. The mean DAP value of 1.75 and a high correlation coefDeserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities. Among these, the Eshtehard Plain, identified by the Ministry of Energy's reports as one of the critically restricted plains due to its groundwater resource conditions, is highly sensitive to active geomorphological processes and surface changes. This study aims to analyze the geometric patterns and degree of turbulence in clay microforms of the Eshtehard Plain using the perimeter-area fractal model as a tool for simulating unstable surface disturbances.Deserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities. Among these, the Eshtehard Plain, identified by the Ministry of Energy's reports as one of the critically restricted plains due to its groundwater resource conditions, is highly sensitive to active geomorphological processes and surface changes. This study aims to analyze the geometric patterns and degree of turbulence in clay microforms of the Eshtehard Plain using the perimeter-area fractal model as a tool for simulating unstable surface disturbances.Deserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities. Among these, the Eshtehard Plain, identified by the Ministry of Energy's reports as one of the critically restricted plains due to its groundwater resource conditions, is highly sensitive to active geomorphological processes and surface changes. This study aims to analyze the geometric patterns and degree of turbulence in clay microforms of the Eshtehard Plain using the perimeter-area fractal model as a tool for simulating unstable surface disturbances.Deserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities. Among these, the Eshtehard Plain, identified by the Ministry of Energy's reports as one of the critically restricted plains due to its groundwater resource conditions, is highly sensitive to active geomorphological processes and surface changes. This study aims to analyze the geometric patterns and degree of turbulence in clay microforms of the Eshtehard Plain using the perimeter-area fractal model as a tool for simulating unstable surface disturbances.Deserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities. Among these, the Eshtehard Plain, identified by the Ministry of Energy's reports as one of the critically restricted plains due to its groundwater resource conditions, is highly sensitive to active geomorphological processes and surface changes. This study aims to analyze the geometric patterns and degree of turbulence in clay microforms of the Eshtehard Plain using the perimeter-area fractal model as a tool for simulating unstable surface disturbances.Deserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities. Among these, the Eshtehard Plain, identified by the Ministry of Energy's reports as one of the critically restricted plains due to its groundwater resource conditions, is highly sensitive to active geomorphological processes and surface changes. This study aims to analyze the geometric patterns and degree of turbulence in clay microforms of the Eshtehard Plain using the perimeter-area fractal model as a tool for simulating unstable surface disturbances.eserts, playa lakes, and similar landforms in many arid and semi-arid regions have experienced disturbance and turbulence due to human activities.mong these, the Eshtehard Plain, identified by theficient (above 0.96) confirm the model's validity and the data's alignment with the region's unstable conditions.

کلیدواژه‌ها English

Eshtehard Plain
Fractal
Microform
Perimeter-Area Model
Mud Cracks

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انتشار آنلاین از 22 آذر 1404