ارزیابی کیفیت مورفولوژیکی رودخانه خرم رود، مطالعه موردی: بخش بالایی و پایینی شهر خرم آباد، استان لرستان

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکتری ژئومورفولوژی، گروه جغرافیای طبیعی ، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران

2 دانشیار گروه جغرافیای طبیعی ، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران.

چکیده

رودخانه خرم رود در طی چند دهه گذشته به‌طور چشمگیری تحت تأثیر تغییرات اساسی هم در سطح حوضه و هم در داخل کانال قرار گرفته‌ است. این رودخانه به دلیل واقع شدن در منطقه پرجمعیت خرم آباد و همجواری روستایی زیادی با این جریان، تغییرات در آن می‌تواند منجر به از دست دادن زمین های کشاورزی، آسیب پذیری زیرساخت ها و ساختمان های مجاور آن شود. در واقع اثرات فرایندهای ژئومورفیک (رسوبگذاری در بستر، گسترش کانال، فرسایش کرانه ها و...) این رودخانه به دلیل قرارگیری در منطقه کوهستانی می‌تواند از طغیان‌های آن مهمتر باشد. شناخت وضعیت مورفولوژیکی این رودخانه می‌تواند باعث افزایش آگاهی نسبت به احیاء آن شود.

این تحقیق به منظور ارزیابی کیفیت مورفولوژی خرم رود با استفاده از روش rMQI در طی دوره زمانی 2025-2006 انجام شد. نتایج نشان داد که کیفیت رودخانه خرم‌رود در بخش‌ اول(95/63درصد) و بخش جنوبی(65/57 درصد) کیفیت مورفولوژیکی ضعیفی دارد. علاوه براین نتایج نشان داد، در بخش اول از 6 بازه مورد مطالعه بازه‎های 1-3 و 4 در کلاس ضعیف و بازه‌های 5 و6 در کلاس خیلی ضعیف قرار دارند. نتایج حاصل از ارزیابی 7 بازه مورد بررسی در بخش دوم نشان داد که تنها بازه 4 کیفیت متوسطی دارد و بازه‌های دیگر(1-2-3-5-6-7) در کلاس کیفیت مورفولوژی ضعیف قرار دارند. همچنین نتایج پژوهش نشان داد که رودخانه خرم‌رود دچار شرایط شکننده‌ای شده و به نظر می‌رسد با توجه به تداوم این شرایط و در برخی از موارد با تشدید شاخص‌های فشار وضعیت این رودخانه را حادتر کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment of the morphological quality of the Khorramrod River, case study: upper and lower segments of Khorramabad city, Lorestan province

نویسندگان [English]

  • Shahram Amiri 1
  • Mohammad Mahdi Hosseinzadeh 2
1 Ph. D student in Geomorphology, Department of Physical Geography, Earth Sciences Faculty, Shahid Beheshti University,Tehran
2 Associated Professor, Department of Physical Geography, Earth Sciences Faculty, Shahid Beheshti University, Tehran
چکیده [English]

The Khorramroud River has undergone significant transformations over the past few decades, both at the basin level and within the channel itself. Due to its location in the densely populated area of Khorramabad and its proximity to numerous rural settlements, this river poses risks such as the loss of agricultural lands and increased vulnerability of nearby infrastructure and buildings. The geomorphic processes affecting the river—such as sediment deposition, channel expansion, and bank erosion—are particularly critical in this mountainous region, where their impacts may surpass those of flooding events. Understanding the morphological state of this river can enhance awareness and contribute to its restoration efforts.

This study aimed to evaluate the morphological quality of the Khorram River using the rMQI method over the period 2006–2025. The results indicated that the morphological quality of the Khorram River is poor in the northern section (63.95%) and the southern section (57.65%). Findings revealed that, in the northern section, out of six studied reaches, reaches 1, 3 and 4 fall into the poor quality class, while reaches 5 and 6 are classified as very poor. The evaluation of seven reaches in the southern section showed that only reach 4 has moderate quality, whereas the other reaches (1, 2, 3, 5, 6, and 7) are classified as poor in terms of morphological quality. Additionally, the study demonstrated that the Khorram River is experiencing fragile conditions, which may worsen due to the persistence of these conditions and intensification of pressure indices in certain cases.

کلیدواژه‌ها [English]

  • Geomorphic processes '
  • Morphological quality '
  • Reach '
  • Khorramroud '
  • '
  • Lorestan '

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  • تاریخ دریافت: 16 فروردین 1404
  • تاریخ بازنگری: 10 خرداد 1404
  • تاریخ پذیرش: 11 خرداد 1404

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