تعیین جریان محیط‌زیستی به روش هیدرولیکی در شرایط کمبود داده در رودخانه چشمه‌لنگان

نوع مقاله : مقاله پژوهشی

نویسندگان

استاد گروه آبخیزداری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

چکیده

امروزه استفاده از آب‌های سطحی به منظور تامین نیاز‌های متنوع انسان نظیر شرب، کشاورزی و صنعت باعث شده است که سلامت اکوسیستم‌های رودخانه‌ای و نقش آن در سامانه طبیعی به خطر بیفتد. حداقل جریان محیط‌زیستی در رودخانه سطح مطمئنی از حفاظت را برای محیط زیست وابسته به آب مهیاء می‌کند. در پژوهش حاضر مقدار جریان محیط‌زیستی رودخانه چشمه‌لنگان واقع در استان اصفهان از دو روش هیدرولیکی شیب منحنی و حداکثر انحناء محیط خیس شده محاسبه شد. نتایج نشان داد که هر دو روش شیب و انحناء مقادیر یکسانی از حداقل جریان محیط‌زیستی برآورد می‌کنند. به‌طوری‌که اختلاف دو روش در ایستگاه S1 حدود 07/0 مترمکعب بر ثانیه بود. با توجه به دبی اندازه‌گیری شده در ایستگاه S1، به غیر از ماه آذر در تمام ماه‌ها حداقل جریان محیط‌زیستی تامین می‌شود. در حالی که در ایستگاه‌های S3 و S4 دبی جریان اندازه‌گیری شده، حداقل جریان محیط‌‎زیستی را به‌دلیل تاثیر سد در هیچ کدام از ماه‌ها تامین نمی‌کند. مقدار دبی 39/0 مترمکعب برثانیه برای ایستگاه اول (S1) و 44/1 و 68/1 مترمکعب برثانیه به ترتیب برای ایستگاه‌های سوم و چهارم (S3 و S4) به‌عنوان حداقل جریان محیط‌زیستی رودخانه چشمه‌لنگان پیشنهاد شده است. نتایج این تحقیق نشان داد که در شرایط کمبود داده می‌توان جریان محیط‌زیستی را به روش هیدرولیکی به دست آورد.

کلیدواژه‌ها


عنوان مقاله [English]

Determining the environmental flow requirement using hydraulic method in data scarce in Cheshmeh Langan River

نویسندگان [English]

  • Mehdi Vatakhah
  • Mohammad Tavosi
2Professor, Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University
چکیده [English]

Today, the use of surface water to meet various human requirements such as drinking, agriculture and industry has endangered the health of this river ecosystem and its role in the natural system. The minimum environmental flow in the river provides a safe level of protection for the water-dependent environment. In the present study, the environmental flow requirement of three stations of Cheshmeh Langan River located in Isfahan province were calculated by two hydraulic methods: slope and maximum curvature of wetted perimeter. The results showed that both slope and curvature methods estimate the same minimum environmental flow requirement. So that the difference between the two methods in S1 station was about 0.07m3/s. According to the discharge measured at station S1, minimum environmental flow requirement is provided in all months except December. While the measured discharge at S2 and S4 stations cannot provide the minimum environmental flow requirement due to the impact of the dam and water transfer in any of the months. The flow of 0.39 m3/s for the first station (S1) and 1.44 an 1.68 m3/s for the second and third stations, respectively has been proposed as the minimum environmental flow requirement of Cheshmeh Langan River. The results of this study showed that the environmental flow requirement can be estimated using hydraulic method in data scarce.

کلیدواژه‌ها [English]

  • Isfahan province
  • Environmental water requirement
  • Wetted perimeters
  • HEC-RAS
  • Hydraulic modeling
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