استفاده از مدل RVA در تبیین رژیم اکولوژیکی رودخانه‌ها به منظور تعیین جریان زیست محیطی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد دانشگاه بین المللی امام خمینی (ره)، دانشکده فنی و مهندسی

2 عضو هیئت علمی گروه مهندسی آب، دانشکده فنی و مهندسی، دانشگاه بین الملی امام خمینی (ره) قزوین

چکیده

در بسیاری از کشورها منجمله کشورهای در حال توسعه،به علت کمبود داده و همچنین هزینه زیاد مطالعات زیست محیطی،روشهای هیدرولوژیکی ساده ای نظیر تنانت و Q95برای تعیین حق آبه رودخانه ها از اولویت برخوردار هستند در این تحقیق روش RVA، با این فرض که از سادگی روشهای هیدرولوژیکی برخوردار است و در عین حال می تواند نتیجه ای نزدیک به روشهای شبیه ساز زیستگاه بدست دهد، مورد آزمون قرار گرفت. در این مطالعه دقت و توانایی روش‌های هیدرولوژیکی مزبور برای سازگاری با محیط‌زیست رودخانه مورد بررسی قرار گرفت. به منظور نمایش مشکلات تأمین داده و اجرای مدلهای شبیه ساز زیستگاه از مدلRiver2D استفاده به عمل آمد و تفاوت نتایج حاصل از رژیم اکولوژیکی پیشنهادی این مدل برای رودخانه مورد مطالعه ا با نتایج دو روش هیدرولوژیکی یاد شده ارزیابی گردید. در مطالعه موردی انجام شده علاوه بر نمایش وضعیت رودخانه در صورت اعمال روشهای تنانت و Q95، جریان اکولوژیکی حاصل از مدل River2Dدر مقیاس ماهانه دربین دو محدوده بالا و پایین روش RVAبدست آمد. در بررسی آماری دبی های ماهانه رودخانه مورد مطالعه این نتیجه نیز بدست آمد کهبرای داده‌های دارای چولگی بهتر است از میانه جریان ماهانه تاریخی به جای میانگین استفاده به عمل آورد. در نهایت این نتیجه‌گیریبه عمل آمد که دبیحاصل از River2D در رودخانه در همه ماهها قابل تامین نمی‌باشد، در حالی که روش RVAجریان زیست‌محیطی حداقلیبدست می‌دهد که می‌تواند تمام معیارهای مورد انتظار را برای حفظ محیط زیست در رودخانه را ارضا نماید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Using RVA Model for Defining Rivers’ Ecological Regime for Determining Environmental Flow

نویسندگان [English]

  • Somaye Khanmohammady Fallah 1
  • Alireza Shokoohi 2
1 Imam Khomeini International University
چکیده [English]

In many countries, especially developing countries, because of data shortage and costly environmental studies, simple hydrologic methods such as the Tenant and Q95 methods, are main methods for determining environmental flow requirements. In this study, the compatibility of these methods with ecological conditions of rivers was investigated. For illustrating difficulties in providing required data for running physical habitat simulation models the River2D as a 2D hydraulic model was used. The ecological regime of the studied river derived by the River2D was compared with the outcomes of the two aforementioned hydrologic methods. The RVA method, based on the assumption that this method is as simple as the other hydrologic methods while it is capable of giving results as precise as habitat simulation models, was investigated. In the case study, the situation of the river based on the suggested EF by the Tenant and Q95 methods was shown and it was illustrated that the monthly ecological flow determined via River2D was captured by the upper and lower limits of the RVA method. Moreover, It was concluded that using monthly median flow instead of mean monthly flow s is preferable in the presence of skewness. Finally, it was determined that the discharges prescribed by River2D could not be supplied in all months, while RVA yielded minimum monthly environmental flows that could satisfy all the necessary conditions for conserving biotic and abiotic habitat in the study river.

کلیدواژه‌ها [English]

  • Hydrologic methods
  • Habitat simulation model
  • Ecological regime
  • RVA

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