نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه جغرافیای طبیعی، دانشکده ادبیات و علوم انسانی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 گروه جغرافیای طبیعی، دانشکده علوم جغرافیایی، دانشگاه خوارزمی، تهران، ایران
چکیده
تغییراتی که درکیفیت مورفولوژیکی یک رودخانه رخ می‌دهد حاصل تداخل‌های انسانی و نیز تغییرات در مورفولوژی رودخانه است. رودخانه طالقان یکی از منابع مهم آب در آبیاری محصولات کشاورزی دشت قزوین محسوب می‌شود. با توجه به اهمیت اقتصادی سد طالقان بر روی این رودخانه و نیز جنس زمین، بعضی از بازه‌های این رودخانه دچار تغییراتی شده است؛ لذا، ارزیابی کیفیت مورفولوژیکی این رودخانه به‌منظور اهداف برنامه‌ریزی حائز اهمیت است. هدف از این پژوهش ارزیابی کیفیت مورفولوژیکی رودخانه طالقان بر اساس روش شاخص کیفیت مورفولوژی بازبینی‌شده (rMQI) است. روش امتیازدهی rMQI به کمی سازی تغییرات رودخانه می‌پردازد و آن زمانی است که رودخانه با شرایط مرجع خود مقایسه شود. مقدار شاخص rMQI منطبق با کمتر از 30% نشان‌دهنده وضعیت بسیار خوب رودخانه است و بیشتر از 30% بیانگر کیفیت بسیار ضعیف رودخانه است. نتایج پژوهش حاضر نشان داد که تمام بازه‌های رودخانه طالقان دارای وضعیت بسیار ضعیف هستند. علت این وضعیت بسیار ضعیف، مئاندرشدگی رودخانه و دخالت‌های انسانی در بخش بالادست حوزه است. به‌منظور احیای رودخانه طالقان و بهبود کیفیت آب آن محافظت از پوشش گیاهی طبیعی و افزایش آن، جلوگیری از تخریب کاربری اراضی در بالادست حوزه و همچنین کنترل فرسایش کناری رودخانه از طریق اقدامات سازه‌ای و غیر سازه‌ای توصیه می‌شود.
کلیدواژه‌ها
عنوان مقاله [English]
Morphological Quality Evaluation of Taleghan River
نویسندگان [English]
- Nazila Yaghoob Nejad ASL 1
- Fariba Esfandiary Darabad 1
- Sayyad Asghari Saraskanroud 1
- Amir Karam 2
1 physical Geography, Faculty of Literature & Humanities, University of Mohaghegh Ardabili, Ardabil, Iran
2 physical Geography, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran
چکیده [English]
Alterations in river morphological quality are derived from quantification of human pressures as well as river morphological alteration. Taleghan River is an important source of water for the irrigation of Agri cultural lands in Qazvin Plain. For some economic considerations of Taleghan dam reservoir on the river as well as geology, some reaches of the river have undergone alterations. It seems important to morphological quality assessment in order to planning issues. Our study’s aim is to contribute to the morphological quality evaluation based on a revisited Morphological Quality Index (rMQI) protocol. The rMQI scoring system allows for the quantification of changes when compared to reference conditions. The rMQI corresponds to less than 30%, reflecting a good morphological quality; the rMQI corresponds to more than 30%, reflecting an extremely poor morphological quality. In this context, the paper presents all of the Taleghan River reaches suffer from an extremely poor morphological quality. Causes of degradation are meandering as well as numerous anthropogenic pressures in the upstream part of the basin. In order to revive Taleghan River as well as improve its water quality, preserving and remediating native vegetation, prevention and remediation of land use degradation in upstream's basin as well as river bank erosion control measures can use hard and soft strategies engineering are recommended.
کلیدواژه‌ها [English]
- Indicator
- River reaches
- (rMQI) protocol
- River reach disturbed
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