تعیین الگوی فرکتالی در بازه‌ای از رودخانه قره‌سو استان اردبیل

مصطفی‌زاده, رئوف; اسفندیاری, فریبا; ناصری, احمد; عبیات, احمد; ادهمی, مریم

doi:10.22034/hyd.2023.57428.1700

نوع مقاله : پژوهشی

نویسندگان

¹ دانشیار گروه منابع طبیعی و عضو پژوهشکده مدیریت آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی

² استاد گروه جغرافیای طبیعی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران

³ کارشناسی‌ارشد ژئومورفولوژی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران

⁴ استادیار گروه زمین‌شناسی، دانشگاه نفت امیدیه، امیدیه، ایران

⁵ دکتری علوم و مهندسی آبخیزداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران

https://doi.org/10.22034/hyd.2023.57428.1700

چکیده

بعد فرکتال نمایه‌ای قوی و مهم در انعکاس خصوصیات فیزیکی و مورفولوژی رودخانه بوده و ارتباط تنگاتنگی با سایر ویژگی‌های فیزیکی و هندسی رودخانه‌ها دارد. در تحقیق حاضر به‌منظور بررسی وضعیت پیچان‌رودی رودخانه قره‌سوی استان اردبیل براساس الگوی فرکتال از روش شمارش جعبه‌ای استفاده شد، سپس با استفاده از روش ‌همبستگی پیرسون، ارتباط میان پارامترهای مورفولوژیک مورد بررسی قرار گرفت. نتایج پژوهش نشان می‌دهد، بعد فرکتال رودخانه قره‌سو بین 068/2 تا 186/2 متغیر است. حداقل بعد فرکتال در دسته اول و حداکثر در دسته هشتم قرار دارد. بر اساس رابطه معنی‌داری ضریب تعیین میان تعداد و مساحت دایره‌های مماس بر پیچان‌رود با مقادیر 71/0 تا 84/0 می‌توان گفت که پیچان‌رودهای مورد مطالعه در بازه مورد مطالعه از رودخانه قره‌سو از الگوی فرکتالی و خودتشابهی پیروی می‌کند. مقادیر بعد فرکتالی بازه روستای انزاب- روستای طالب‌قشلاقی برابر 23/2 محاسبه شد که نشان می‌دهد این بازه دارای خاصیت خودتشابهی بیش‌تری است و می‌تواند دلیلی بر طبیعی بودن بازه مورد نظر باشد و نیز بازه مذکور در یک محدوده دشتی جریان دارد و رودخانه تکامل بیش‌تری پیدا کرده است. این در حالی است که در بازه روستای طالب‌قشلاقی-سد سبلان مقدار بعد فرکتالی برابر 85/1 به‌دست آمد که می‌تواند به عبور رودخانه از مسیرهایی با شیب بیش‌تر مرتبط باشد که توسعه مئاندر را محدود نموده است. باید اشاره شود که برخی دخالت‌های انسانی در مسیر رودخانه و نیز عبور رودخانه از مجاورت اراضی کشاورزی در برخی موارد باعث تغییر در عرض و عمق رودخانه و محدودیت در گسترش مئاندرها شده است.

کلیدواژه‌ها

موضوعات

ژئومورفولوژی

عنوان مقاله [English]

Determining the fractal pattern in a reach of Qharesou river, Ardabil province, Northwest of Iran

نویسندگان [English]

Raoof Mostafazadeh ¹
Fariba Esfandyari Darabad ²
Ahmad Naseri ³
Ahmad Abyat ⁴
Maryam Adhami ⁵

¹ Associate Professor, Department of Natural Resources and member of Water Management Research Center, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili

² Professor, Department of Physical Geography, Faculty of Social Science, University of Mohaghegh Ardabili, Ardabil, Iran

³ M.Sc. in Geomorphology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

⁴ Assistant Professor, Department of Geology, Islamic Azad University, Omidiyeh Branch, Omidiyeh, Iran

⁵ Ph.D in Watershed Management Sciences and Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran

چکیده [English]

Fractal dimension is a powerful and important index that reflects the physical and morphological characteristics of rivers and has a close relationship with geometric features of rivers. The fractal pattern was used to investigate the sinuosity of the Gharehsou River in Ardabil Province, using the box-counting method. The results show that the fractal dimension of the Gharehsou River varies between 2.068 and 2.186. The minimum fractal dimension is in the first category of meanders with lower areas of tangent circle, and the maximum number of circles falls into the eighth category (having high areas of tangent circle). Based on the correlation between the number and area of tangent circles (0.71 to 0.84), it can be said that the river reaches studied follow a fractal and self-similar pattern. The fractal dimension values in the Anzab village-Taleb Qeshlaqi village reach were calculated to be 2.23, indicating a higher level of self-similarity, which is related with the naturalness of this river reach, which is located within a plain area, and the river has undergone more evolution. On the other hand, in the Taleb Qeshlaqi village-Sabalān Dam reach, the fractal dimension value was found to be 1.85, which may be related to the river traversing steeper paths, limiting its meander development and making the fractal pattern less observable. Human interventions in the river's course, as well as the river's passage through agricultural lands in some cases, have led to changes in the width and depth of the river and restrictions on meander expansion.

کلیدواژه‌ها [English]

Box-counting
Fractal dimension
River morphology
Qareh-Sou River
Northwest Iran

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هیدروژئومورفولوژی

تعیین الگوی فرکتالی در بازه‌ای از رودخانه قره‌سو استان اردبیل

مراجع

مراجع

دوره 10، شماره 37 - شماره پیاپی 37
دی 1402
صفحه 97-81

تعیین الگوی فرکتالی در بازه‌ای از رودخانه قره‌سو استان اردبیل

مراجع

مراجع

دوره 10، شماره 37 - شماره پیاپی 37دی 1402صفحه 97-81

دوره 10، شماره 37 - شماره پیاپی 37
دی 1402
صفحه 97-81