تجزیه و تحلیل حساسیت پارامترهای ورودی مدل مدیریت رواناب شهری SWMM (مطالعه موردی: شهر ماهدشت)

نوع مقاله : پژوهشی

نویسندگان

1 دانشکده منابع طبیعی دانشگاه تهران

2 دانشیار دانشکده منابع طبیعی دانشگاه تهران

3 استاد دانشکده منابع طبیعی دانشگاه تهران

چکیده

در طی چند دهه­ی گذشته با توجه به رشد سریع جمعیت و توسعه­ی شهری، رواناب شهری افزایش یافته و منجر به مشکلات محیط زیستی مختلفی از جمله آب­گرفتگی معابر سطح شهر، انتشار آلودگی‌های زیست محیطی و خطرات ناشی از گسترش سیلاب شده است. تحلیل حساسیت روشی است برای نشان دادن این که کدام یک از پارامترها ورودی مدل تأثیـر بیشتری بر نتایج اعمال می­کند. هدف از تحقیق تعیین پارامترهای مهم ورودی مدل SWMM و اطمینان از عملکرد مدل در شهر ماهدشت است. به این ترتیب که از مقدار اولیه برآورد شده 10 پارامتر‌ درصد مناطق نفوذناپذیر، شیب، عرض معادل، ضریب زبری مانینگ در مناطق نفوذپذیر و نفوذناپذیر،زمان تمرکز، شماره منحنی(CN)، ارتفاع ذخیره در مناطق نفوذناپذیر و نفوذپذیر و درصد مناطق نفوذناپذیر بدون ذخیره­ی سطحی، به مقدار 15 و 30 درصد افزایش و کاهش داده شد و آب­دهی  اوج حاصل از این تغییرات به عنوان متغیر وابسته مورد بررسی قرار گرفت. نتایج نشان داد حساس­ترین پارامتر مربوط به درصد اراضی نفوذناپذیر و کم­حساس­ترین پارامتر مربوط به ارتفاع ذخیره­ی مناطق نفوذپذیر است. برای فرایند واسنجی و اعتبارسنجی مدل رواناب متناظر با سه واقعه­ی بارندگی در خروجی حوضه‌ اندازه­گیری و با رواناب شبیه­سازی شده به وسیله‌ی مدل مقایسه گردید. نتایج نشان داد که انطباق خوبی بین آب­دهی و عمق رواناب شبیه­سازی شده و مشاهده­ای وجود دارد. بنابراین می­توان از این مدل برای پیش­بینی خطر آبگرفتگی، طراحی و اولویت­بندی مناطق برای رفع مشکل آب­گرفتگی استفاده کرد.

کلیدواژه‌ها

عنوان مقاله [English]

Sensitivity analysis of input parameters of SWMM model to urban runoff management (Case study: Mahdasht town)

نویسندگان [English]

  • Ali Shahbazi 1
  • Sharam Khalighi Sigarodi 2
  • Arash Malekian 2
  • Ali Salajegh 3
1 Faculty of Natural Resources, Tehran University
2 Associate Professor, Faculty of Natural Resources, Tehran University
3 Full Professor, Faculty of Natural Resources, Tehran University
چکیده [English]

During the past decades due to population growth and urbanization , urban runoff has increased and lead to different Environmental problems such as inundation risk, release the environmental pollutions and risks of flooding.Sensitivity analysis is used to determine the important input parameters which caused run off. Basically, the aim of this study was determine the important input parameters of SWMM model and the reliability of this model Performance in the Mahdashttown. Therefore, 10 parameters including percentage of impervious area, slope, width, N-Manning for impervious area, time of concentration, curve number, N-Manning for pervious area, depth of depression storage on impervious area, depth of depression storage on pervious area and percent of impervious area with no depression storage reduction, the first account of abovementioned parameters was increased and decreased 15 and 30 percent and flood peak discharge was selected as the dependent variable. For calibration and validation process model, corresponding to three event rainfall runoff measured at the output of the basin and was compared with runoff simulated by the model. The results showed there is good agreement between simulated and observed runoff discharge and depth.So this model can use to predict the inundation risk, design and prioritization areato fixing the inundation problem.

کلیدواژه‌ها [English]

  • Urban runoff
  • Sensitivity analysis
  • Calibration
  • Validation
  • SWMM model
  • pervious area

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فایل ها

سابقه مقاله

  • تاریخ دریافت: 31 فروردین 1392
  • تاریخ بازنگری: 28 اسفند 1392
  • تاریخ پذیرش: 31 خرداد 1393

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