بهبود مدل‌سازی حوضه آبریز با تجمیع مولفه‌های اصلی هیدرولوژیک در مدل SWAT

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار/گروه مهندسی آب و خاک، دانشکده کشاورزی دانشگاه صنعتی شاهرود، شاهرود، ایران.

2 استاد/ گروه مهندسی آب، دانشکده کشاورزی دانشگاه فردوسی مشهد، مشهد، ایران.

3 استادیار/گروه مهندسی آب و خاک، دانشکده کشاورزی دانشگاه گیلان، رشت، ایران.

4 استاد /گروه مهندسی آب، دانشکده کشاورزی دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

آگاهی دقیق‌تر از مولفه‌های بیلان آب در سطح حوضه‌های آبریز، به فهم بهتر رفتار هیدرولوژیک حوضه‌ها کمک شایانی خواهد نمود. در این تحقیق تاثیر کاربرد دو مولفه رواناب و تبخیر- تعرق واقعی در مدل‌سازی حوضه آبریز نیشابور (9500 کیلومتر مربع) در قالب مدل SWAT (Soil Water Assessment Tool) مورد بررسی قرار گرفت. مدل یک‌بار به کمک داده‌های رواناب و بار دیگر به صورت ترکیبی و با استفاده از داده‌های رواناب و تبخیر- تعرق واقعی به-دست آمده از تکنیک سنجش از دور، واسنجی و رفتار آن در برآورد همین دو مولفه در دوره زمانی جداگانه‌ای اعتبارسنجی شد. نتایج آنالیز حساسیت مدل نشان داد که پارامترهایی نظیر آب قابل دسترس، ضریب جبران کننده تبخیر از سطح خاک و ضریب جبران کننده جذب رو به بالای آب توسط گیاه بیشترین حساسیت را به تغییرات ورودی مدل از خود نشان دادند. نتایج نشان داد که ریشه میانگین مربعات خطا در برآورد رواناب در مرحله اعتبارسنجی و در سه ایستگاه آب‌سنجی اندراب، خرو مجموع و حسین‌آباد برای مدل واسنجی شده بر اساس رواناب در بازه 06/0 تا 19/0 و برای مدل ترکیبی در بازه 02/0 تا 09/0 متر مکعب در ثانیه متغیر بود. اما نقش استفاده از هر دو مولفه رواناب و تبخیر- تعرق واقعی در پیش‌بینی تبخیر- تعرق واقعی برجسته‌تر بود. ریشه میانگین مربعات خطا در برآورد تبخیر- تعرق واقعی در سه زیرحوضه منتخب و برای مدل واسنجی شده بر اساس رواناب در بازه 10 تا 52/18 و برای مدل واسنجی شده ترکیبی در بازه 84/6 تا 82/7 میلیمتر در ماه متغیر بود

کلیدواژه‌ها


عنوان مقاله [English]

Improvement the Watershed Modeling with Aggregation of the Main Hydrological Components Using SWAT Model

نویسندگان [English]

  • R. Moazenzadeh 1
  • B. Ghahraman 2
  • S. Arshad 3
  • K. Davary 4
1 Assistant Professor, Department of Soil and Water Engineering, Faculty of Agriculture, Shahrood University of Technology, Iran. Email: romo_sci@shahroodut.ac.ir
2 Professor, Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran. Email: bijangh@um.ac.ir
3 Assistant Professor, Department of Water Engineering, Faculty of Agriculture, Guilan University, Iran
4 Professor, Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran.
چکیده [English]

More accurate knowledge of the water balance components in the watersheds will help a better understanding of hydrological behavior of the watersheds. In this study, the effect of two components, river discharges and actual evapotranspiration were investigated on the Neyshabour (9500 km2) watershed modeling using SWAT (Soil Water Assessment Tool). First, SWAT with the river discharges values and then with the combination of river discharges and actual evapotranspiration obtained based on remote sensing was calibrated and its performance in predicting of these components in a separate time period was validated. The sensitivity analysis results showed that parameters such as available water content, soil evaporation compensation coefficient and plant uptake compensation factor were the most sensitive to changes of input model parameters. The results showed that the root mean square error for river discharges prediction on the validation period in three hydrometric stations named Andarab, Kharve Majmoo’ and Hossein Abad was varied between 0.06 to 0.19 m3/s and 0.02 to 0.09 m3/s for the models calibrated based on river discharges and combination of river discharges and actual evapotranspiration, respectively. But the use of both mentioned components, river discharge and actual evapotranspiration, was prominent in predicting actual evapotranspiration. Root mean square error for actual evapotranspiration prediction in three selected subbasins was varied between 10 to 18.52 mm/month and 6.84 to 7.82 mm/month for the models calibrated based on river discharges and combination of river discharges and actual evapotranspiration, respectively.

کلیدواژه‌ها [English]

  • Actual Evapotranspiration
  • Hydrometric station
  • Remote Sensing
  • river discharge
  • Sensitivity analysis
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