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بررسی شبکه آبراهههای حوضه آبریز رامهرمز با استفاده از مدل توکوناگا و بعدفرکتال همبستگی | ||
هیدروژئومورفولوژی | ||
دوره 9، شماره 33، دی 1401، صفحه 20-1 اصل مقاله (1.46 M) | ||
نوع مقاله: پژوهشی | ||
شناسه دیجیتال (DOI): 10.22034/hyd.2022.49711.1618 | ||
نویسندگان | ||
مهشید معاوی1؛ هیوا علمیزاده* 2 | ||
1فارغ التحصیل کارشناسی ارشد ژئومورفولوژی | ||
2عضو هیات علمی دانشگاه علوم و فنون دریای خرمشهر | ||
چکیده | ||
در دیدگاه رفتارهای فرکتالی، ویژگی همانندسازی در طول زمان الگوهایی را در بستر حوضه بهوجود میآورند که بنا بر ویژگیهای زایشی و چگونگی تحولات، عملکرد منحصر بهفردی را در طی بلوغ یک حوضه آبریز به نمایش میگذارند. بههمین دلیل در این پژوهش با هدف بررسی انشعاب شبکههای آبراههای حوضه رامهرمز از مدل توکوناگا و بعدفرکتال همبستگی استفاده شده است. رودخانه رامهرمز از زیرحوضههای حوضه آبریز جراحی واقع در جنوب غربی کشور میباشد که از 50 کیلومتری جنوب شرق ایذه سرچشمه گرفته و به سوی جنوب غرب سرازیر میگردد. در این پژوهش شبکههای رودخانه با استفاده از نرمافزار Arc GIS استخراج شده و سپس دادههای ورودی برای محاسبه عدد فرکتالی دو بعدی به کمک تابع همبستگی وارد نرمافزار گردید. در این راستا ابتدا حوضه رامهرمز را به دو بخش شرقی و غربی تقسیم نموده و در ادامه با استفاده از روش توکوناگا، شبکه نامنظم و منحنی رودخانه رامهرمز به شکل منظم، هندسی و درختی منتناظر ترسیم شده است. با توجه به طول شاخهها، بعد فرکتالی برای هر دو بخش حوضه رامهرمز محاسبه گردید. بعد فرکتالی همبستگی حوضه رامهرمز و بخشهای شرقی و غربی آن بین (42/1 تا 68/1) با ضریب همبستگی بالا برآورد گردیده است. بعد فرکتال محاسبه شده معرف نسبت انشعاب متوسط و مدت زمان اندک برای رسیدن به جریان دائمی است که بیانگر رفتار آشوبناکی نسبتاً بالای حوضه و بخشهای آن میباشد. | ||
کلیدواژهها | ||
بعد فرکتال همبستگی؛ مدل توکوناگا؛ شبکه های آبراهه ای؛ حوضه رامهرمز؛ جنوب غرب ایران | ||
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مراجع | ||
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