برآورد رواناب رویداد مبنا در حوضۀ کوهستانی با استفاده از مدل توزیعی‌ـ فیزیکی GSSHA

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی منابع آب، گروه مهندسی آب، دانشکدۀ مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان

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

مدل‌های توزیعی‌ـ فیزیکی در شبیه‌سازی فرایندهای رواناب سطحی در حوضه‏هایی با شرایط پیچیدۀ فیزیکی به جواب‌هایی با اعتمادپذیری بیشتر منجر می‏شوند. در این مطالعه مدل‌سازی فرایند بارش‌ـ رواناب در حوضۀ آبریز کوهستانی زیارت با استفاده از مدل توزیعی‌ـ فیزیکی GSSHA بررسی شده است. به این منظور نقشه‏های مدل رقوم ارتفاعی، نوع خاک و کاربری اراضی تهیه شده و سه رویداد برای واسنجی و دو رویداد برای صحت‏سنجی در نظر گرفته شد. معیارهای دقت برازش نش‌ـ ساتکلیف (NSE)، درصد خطای برآورد حجم (PEV)، درصد خطای برآورد دبی اوج (PETP) و درصد خطای برآورد زمان دبی اوج (PEP) و معیار بصری برای تحلیل نتایج استفاده شد. میانۀ معیارهای PEV، PEP و PETP در مراحل واسنجی و صحت‌سنجی به‌ترتیب 3/25 و 5/61، 5/5 و 8/11 و 8/4 و 0 بوده که نشان‌دهندۀ کم‌برآوردی حجم، دقت مناسب در دبی اوج و دقت بسیار خوب در زمان دبی اوج است. نیز بررسی بصری هیدروگراف‌های شبیه‌سازی و معیار NSE تأیید‌کنندۀ دقت مدل در شبیه‏سازی شکل هیدروگراف رواناب است. نتایج نشان می‏دهد اگر‏چه پارامتر رطوبت اولیۀ خاک در مرحلۀ صحت‏سنجی بر اساس یک تخمین اولیه در نظر گرفته شده، در مجموع دقت مدل در برآورد مشخصه‌های رواناب مناسب است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Event-Oriented Runoff Estimation in Mountainous Basin by GSSHA Physically- Distributed Model

نویسندگان [English]

  • Ali Sharifi 1
  • Meysam Salarijazi 2
  • Khalil Ghorbani 3
1 MSc Student of Water Resources Engineering, Water Engineering Department, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
2 Assistant Prof. Water Engineering Department, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
3 Associate Prof. Water Engineering Department, Faculty of Water and Soil Engineering, Gorgan University of Agricultural Sciences and Natural Resources
چکیده [English]

The physically-distributed models lead to more reliable results for surface runoff process simulation in basins with complicated physical condition. In this study, rainfall-runoff modeling in Ziarat mountainous basin is investigated using GSSHA physically-distributed model. Digital elevation model, soil type and land use maps prepared and three and two events are considered for calibration and validation. Fitness precision criteria including Nash-Sutcliffe (NSE), Percentage Error in Volume (PEV), Percentage Error in Time to Peak (PETP) and Percentage Error in Peak (PEP) beside visual criterion used for results analysis. Median of PEV, PEP and PETP for calibration and validation steps were (25.3 and 61.5), (5.5 and 11.8) and (4.8 and 0) that indicated underestimation for volume, suitable precision for peak and excellent precision for time to peak estimations. Also, evaluation of simulated hydrographs using visual and NSE criteria confirmed model precision for hydrograph simulation. The results show although soil initial moisture selected based on initial estimation in validation step but the overall precision of model in runoff characteristics estimations is suitable.

کلیدواژه‌ها [English]

  • Physically-Distributed
  • Rainfall-runoff
  • GSSHA
  • Ziarat
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