مقایسۀ خصوصیات واکنشی و بیلان حجمی آب در سه روش هیدروگراف واحد (مطالعۀ موردی: حوضۀ آبخیز ونک)

نوع مقاله: پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی منابع آب، دانشکدۀ کشاورزی، دانشگاه شهرکرد

2 استادیار، دانشکدۀ کشاورزی، دانشگاه شهرکرد

3 استادیار، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه شهرکرد

چکیده

هیدروگراف واحد، یک روش شبیه‏سازی سیلاب در پاسخ به یک واحد بارش مازاد روی کل حوضۀ آبخیز است که بر پایۀ اصول سیستمی انطباق و تناسب عمل می‏کند. روش‏های متفاوتی از هیدروگراف واحد ارائه شده است که عملکرد آنها در شرایط محلی حوضه‏های آبخیز متفاوت است. در این تحقیق به‌منظور مقایسۀ عملکرد این روش‏ها با استفاده از مدل هیدرولوژیکی HEC-HMS و با اعمال روش احتساب‌کنندۀ رطوبت خاک (SMA) و روش مخزن خطی به‌ترتیب برای محاسبۀ میزان تلفات و جریان پایۀ حوضه، هیدروگراف سیلاب و مشخصات آب‌نمود سیل شامل دبی اوج و حجم رواناب با استفاده از سه روش هیدروگراف واحد اشنایدر، کلارک و SCS شبیه‏سازی شد. برای مقایسۀ کارایی مدل‏ها، ضریب کارایی نش– ساتکلیف به عنوان تابع هدف در نظر گرفته شد. پارامترهای هیدرولوژیکی مدل به صورت دستی و با استفاده از روش سعی و خطا ارزیابی و واسنجی شد. نتایج نشان داد درصد اختلاف بین حجم رواناب مشاهداتی و شبیه‏سازی‌شده در هر سه روش کاملاً نزدیک بود. در حالی که از نظر دبی اوج، روش هیدروگراف واحد کلارک با ضریب کارایی نش– ساتکلیف 68/0 کمترین میزان درصد اختلاف بین دبی اوج مشاهداتی و شبیه‏سازی‌شده را نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Comparing the Response Characteristics and Volumetric Water Balance in Three Unit Hydrograph Methods (A case study: Vanak Basin)

نویسندگان [English]

  • ُُُSamira Bayati 1
  • Mohammad Ali Nasr Esfahani 2
  • Khodayar Abdollahi 3
1 DEPARTMENT OF WATER RESOURCES ENGINEERING, FACULTY OF AGRICULTURE
2 Assistant Professor, Department of Water Engineering, Shahrekord University, Shahrekord,
3 Academic member
چکیده [English]

Unit Hydrograph is a method for flood hydrograph simulation resulting n response to a unit of excess rainfall on the basin. The theory for unit hydrograph is based on two systematic principles called superposition and proportionality. So far several methods of unit hydrograph has been developed which show different responses and functionalities under local conditions of the basin. In this study we used a continuous hydrologic simulation from HEC-HMS model to compare the performance of three unit SMA algorithm and linear reservoir were selected as loss and base-flow functions of the basin, respectively. The flood hydrograph and its specifications including peak discharge and runoff volume were derived using three ways of Snyder, Clark and SCS methods. To compare the performance of models the Nash - Sutcliffe Efficiency was considered as as the objective function. Parameterization and validation of the hydrological parameters were done by changing parameters manually and a applying a trial-error method. Results showed for all three methods the percent of differences between the simulated and observed volumes for runoff was quite very close to each other. While in term of peak flows, the Clarke unit hydrograph method showed the best agreement between the simulated and observed peak discharges.

کلیدواژه‌ها [English]

  • HEC-HMS model
  • Nash-Sutclif
  • Unit Hydrograph
  • Vanak Basin
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