نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکترای مهندسی منابع آب، علوم و مهندسی آب، دانشکده‌ی کشاورزی، دانشگاه بیرجند

2 استادیار گروه مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه بیرجند، ایران.

چکیده

برآورد هیدروگراف سیلاب در حوضه­های فاقد آمار یک موضوع چالش برانگیز در برنامه­ریزی و مدیریت سیلاب می­باشد. مدل­های مختلفی در این زمینه توسعه داده شده است و ضرورت دارد که کارایی مدل­های توسعه داده شده در مناطق مختلف جهان با ویژگی­های متفاوت اقلیمی، هیدرولوژیکی و فیزوگرافی مورد ارزیابی قرار گیرد تا بتوان در مورد کارایی آنها در مناطق مختلف اظهار نظر کرد. مدل هیدروگراف واحد مصنوعی گاما یک مدل توسعه داده شده در زمینه‌ی برآورد هیدروگراف سیل آب در حوضه­های فاقد آمار است. در این مطالعه مدل هیدروگراف واحد مصنوعی گاما برای برآورد مشخصه‌های هیدروگراف سیلاب در حوضه‌ی آبریز قره­سو در استان کرمانشاه مورد بررسی قرار گرفته است. معیارهای خطای دبی اوج، خطا حجم جریان، میانگین قدرمطلق خطا، میانگین بایاس خطا، ضریب تبیین و  کلینگ- گوپتا برای ارزیابی دقت نتایج شبیه‌سازی برآورد گردید. بر اساس نتایج معیارهای ارزیابی بیان شده نشان داد که مدل هیدروگراف واحد مصنوعی گاما از دقت کاملاً مناسب در برآورد مشخصه­های هیدروگراف سیلاب برخوردار بوده است. بعلاوه مقایسه‌ی بصری هیدروگراف­های محاسباتی و مشاهداتی مبین دقت قابل توجه مدل هیدروگراف واحد مصنوعی گاما در برآورد شکل هیدروگراف سیلاب در رویدادهای مورد مطالعه می­باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimation of flood hydrographs in ungauged watershed with Gamma synthetic unit hydrograph model

نویسندگان [English]

  • Erfan Bahrami 1
  • mehdi dastourani 2

1 Ph.D. Student of Water Resources Engineering, Faculty of Agriculture, Birjand University

2 Assistant Professor of Water Resources Engineering, Faculty of Agriculture Sciences and Natural Resources, Birjand University, iran

چکیده [English]

Estimation of flood hydrographs in the ungauged watersheds is a challenging issue in flood planning and management. Various models have been developed in this filed and it is necessary to evaluate the performance of models developed in different regions of the world with different climatic, hydrological and physiographic features in order to comment on their performance in different regions. The Gamma synthetic unit hydrograph model is a developed model for estimating flood hydrographs in the ungauged watersheds with limited studies in the world. In this study, the Gamma synthetic unit hydrograph model for estimating flood hydrograph characteristics in Qareh-Sou watershed located in Kermanshah province in Iran has been investigated. Criteria for percentage error in peak discharge, percentage error in volume, mean absolute error, mean bias error, coefficient of determination and Kling-Gupta were estimated to evaluate the accuracy of simulation results. Based on the results, the mean values of the criteria expressed are 6.28, 17.4, 0.89, 0.54, 0.74 and 0.75, respectively, indicating that the Gamma synthetic unit hydrograph model is quite accurate in estimating the characteristics of the flood hydrograph in this study. In addition, the visual comparison of computational and observational hydrographs illustrates the remarkable accuracy of the Gamma synthetic unit hydrograph model in estimating the shape of flood hydrographs in the studied events.

کلیدواژه‌ها [English]

  • Gamma Model
  • Simulation
  • Flood Estimation
  • Qareh-Sou Watershed
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