برآورد جریان زیست ‏محیطی رودخانه با استفاده از روش‏های هیدرولوژیکی تنانت، تسمن، انتقال منحنی تداوم جریان و مدل ذخیرۀ رومیزی

نوع مقاله : پژوهشی

نویسندگان

1 دانش‌آموختۀ کارشناسی ارشد مهندسی عمران آب، مؤسسۀ غیرانتفاعی لامعی‏گرگانی‌

2 استادیار گروه مهندسی آب، دانشکدۀ مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان‌

3 دانشیار گروه مهندسی آب، دانشکدۀ مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

رویکردهای متفاوتی برای برآورد جریان زیست‏محیطی رودخانه معرفی ‏شده است که به رویکرد هیدرولوژیکی به‌دلیل نیاز دسترسی به داده‏های محدود و زمان نسبتاً سریع ارزیابی توجه زیادی شده است. این رویکرد شامل روش‏های متنوعی است، بنابراین مقایسۀ بین نتایج روش‏های مختلف این رویکرد، ضروری است. هدف از تحقیق حاضر بررسی و مقایسۀ نتایج روش‏های تنانت، انتقال منحنی‏های تداوم جریان، روش مدل ذخیرۀ رومیزی و تسمن در برآورد جریان زیست‏محیطی رودخانۀ زهره در جنوب غربی ایران (ایستگاه آب‏سنجی دهملا) است. بر‌اساس بررسی داده‌های بلند‌مدت جریان متوسط سالانه برابر 18/80 مترمکعب بر ثانیه و دورۀ زمانی مرداد‌ـ مهر و بهمن‌ـ فروردین با جریان متوسط 5/22 و 6/156 مترمکعب بر ثانیه به‌ترتیب دوره‌‌های کم‌آب‏ و پرآب‏ سال هستند. بررسی نتایج روش‏های مختلف نشان می‏دهد روش انتقال منحنی تداوم جریان به‌دلایل ارائۀ مقادیر منطقی جریان زیست‌محیطی در ماه‌های مختلف در مقایسه با دبی جریان متوسط ماهانه و سالانه، تطابق مناسب الگوهای تغییرات درون‌سالی جریان متوسط زیست‏محیطی ماهانه و جریان متوسط ماهانۀ رودخانه و ‌تخصیص‌نیافتن همۀ جریان متوسط ماهانه به جریان مورد نیاز زیست‏محیطی در طول سال قابل ‏پذیرش‏ترین روش برآورد جریان زیست‏محیطی در این مطالعه است. با در‌نظر‌گرفتن نتایج روش انتقال منحنی تداوم جریان مقدار جریان زیست‏محیطی ماهانه بین 2/53-8/6 با متوسط 79/27 مترمکعب بر ثانیه در سال برآورد می‏‌شود. همچنین مقدار جریان متوسط زیست‏محیطی متوسط در دوره‏های کم‌آبی و پرآبی به‌ترتیب 7/7 و 3/49 مترمکعب بر ثانیه است.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

River Environmental Flow Assessment Using Tennant, Tessman, FDC Shifting and DRM Hydrological Methods

نویسندگان [English]

  • Saman Karimi 1
  • Meysam Salarijazi 2
  • Khalil Ghorbani 3
1 - M.Sc. in Civil Engineering, Lamei Gorgani Institute of Higher Education.
چکیده [English]

Different approaches have been presented for estimating river environmental flow which hydrological approach has a lot addressed because of its need to access to limited data and moderately rapid assessment. This approach incorporates various methods therefore comparison between results of different methods is essential. The objective of this study is to investigate and compare the consequences of Tennant, flow duration curve shifting (FDC shifting), desktop reserve model and Tessman methods for environmental flow assessment of Zohreh river (Dehmolla hydrometry station) located in southwestern Iran. According to the long-term flow data the annual mean flow is 80.18 cms and August-October and February-April with 22.5 and 156.2 cms are low and high flow periods of the year. Investigation of consequences of different methods demonstrate FDC shifting is most admissible method for environmental flow assessment in this study because of its reasonable exhibited environmental flows in different months in comparison with monthly and annual mean flow, good compatibility of within-year patterns of monthly environmental and river flow, and lack of allocation of all river flow to environmental flow in all months of the year. Considering the results of the FDC shifting method the monthly environmental flow are estimated between 6.8 to 53.2 cms and its mean annual is 27.79 cms. The mean environmental flow for low and high flow periods are 7.7 and 49.3 cms respectively too.
 

کلیدواژه‌ها [English]

  • Environmental flow
  • Tennant
  • Tessman
  • FDC Shifting
  • DRM
 
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