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تعیین جریان محیطزیستی به روش هیدرولیکی در شرایط کمبود داده در رودخانه چشمهلنگان | ||
نشریه علمی - پژوهشی مرتع و آبخیزداری | ||
دوره 74، شماره 4، اسفند 1400، صفحه 889-903 اصل مقاله (1.15 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/jrwm.2021.327891.1602 | ||
نویسندگان | ||
مهدی وفاخواه* ؛ محمد طاوسی | ||
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 | ||
استان اصفهان؛ محیط خیسشده؛ HEC-RAS؛ مدلسازی هیدرولیکی؛ حقآبه محیطزیستی | ||
مراجع | ||
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