نوع مقاله : پژوهشی

نویسندگان

1 فارغ التحصیل کارشناسی ارشد ژئومورفولوژی

2 عضو 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

موضوعات

عنوان مقاله [English]

Investigation of drainage network of Ramhormoz basin using Tokunaga model and fractal dimension correlation

نویسندگان [English]

  • Mahshid Moavi 1
  • heeva elmizadeh 2

1 Graduate of Master of GeomorphologyUniversity student

2 Faculty member of Khorramshahr Sea University of Science and Technology

چکیده [English]

From the point of view of fractal behaviors, the property of replication over time creates patterns in the bed of the basin that show unique performance during the maturity of a basin, depending on the reproductive characteristics and how they change. For this reason, in this study, investigates the bifurcations of drainage networks of the Ramhormoz basin using Tokunaga model and fractal dimension correlation, has been done. Ramhormoz River is one of the sub-basins of Jarahi basin located in the southwest of the country. This river originates from 50 km southeast of Izeh and flows to the southwest. In this study, river networks were extracted from Arc GIS software, and then input data were entered into the software to calculate two-dimensional fractal numbers using correlation function. In this regard, first Ramhormoz basin is divided into eastern and western parts and then using the Tokonaga method, irregular network and curve of Ramhormoz river are drawn in a regular, geometric and corresponding tree form. According to the length of the streams, the fractal dimension was calculated for both parts of the Ramhormoz basin. The fractal dimension of the correlation between the Ramhormoz basin and its eastern and western parts has been calculated between (1.42 to 1.68) with a high correlation coefficient, which indicates a relatively high turbulent behavior of the basin and its parts. The calculated fractal dimension represents the average bifurcation ratio and the short time to reach a constant flow.

کلیدواژه‌ها [English]

  • Fractal correlation dimension
  • Tokunaga model
  • Drainage networks
  • Ramhormoz Basin
  • Southwest of Iran
 
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