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نوع مقاله : Research Paper

نویسندگان

1 گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی جندی شاپور اهواز، اهواز، ایران

2 گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران

3 گروه مهندسی عمران، دانشکده عمران، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

چکیده
زمینه و هدف: افزایش روزافزون جمعیت و تراکم شهرنشینی و در نتیجه افزایش سطوح نفوذ ناپذیر، منجر به افزایش حجم رواناب های شهری شده است. رخداد بارش ها باعث تغییر در کیفیت رواناب و وررد آلاینده ها می گردد. استفاده از مدلهای شبیه سازی راهی مناسب برای آگاهی از میزان پارامترهای کیفی رواناب می باشد. در این مطالعه کیفیت روانابهای شهر شوشتر و تعیین ضرایب هیدرولیکی و هیدرولوژیکی با استفاده از مدل SWMM بررسی گردید.
مواد و روشها: دو واقعه بارش شهر شوشتر در سال 95 برای انجام فرآیند واسنجی و اعتبار سنجی مدل در نظر گرفته شد و پارامتر های مرتبط با واقعه بارش اول در نقطه خروجی سیستم جمع آوری رواناب اندازه گیری شد. واسنجی کمی و کیفی مدل با استفاده از بارش اول و اعتبار سنجی مدل با استفاده از بارش دوم انجام گردید.
یافتهها: در واسنجی بخش هیدرولیکی، مقادیر میانگین نفوذ ناپذیری، شیب، عرض زیرحوضه و ضریب مانینگ به ترتیب 50%، 75%، 25 متر و 013/0 تخمین زده شدند. در بخش کیفی نیز ضرایب معادلات Build-up برای TSS، COD و Zn به ترتیب (95، 25)، (48، 1) و (1 ، 09/0) و ضرایب معادلات Wash-off برای این پارامترها به ترتیب (21/0، 8/0)، (2/0، 8/0) و (19/0، 78/0) تخمین زده شدند.
نتیجه گیری: نتایج نشان داد که واسنجی دقیق مدل، توانایی مدل را در پیش بینی پارامترهای کمی و کیفی در بارش های بعدی برای منطقه مورد مطالعه افزایش می دهد. نتایج نشان می دهد، مدل سازی ابزاری قدرتمند جهت بهبود مدیریت رواناب می باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Determining the parameters of quantitative-qualitative runoff model for Shushtar city using SWMM calibration

نویسندگان [English]

  • Behzad Jamshidi 1
  • Yaser Tahmasebi Birgani 1
  • Mohammad Jafarpour 1
  • NadAli Alavi Bakhtiarvand 2
  • Ali Akbar Babaei 1
  • Ali Haghighi 3
  • Gholamreza Goudarzi 1

1 Department of Environmental Health Engineering, School of Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

2 Department of Environmental Health Engineering, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran

3 Civil Engineering Department, Faculty of Engineering, Shahid Chamran University, Ahvaz, Iran

چکیده [English]

Background and purpose: Increasing population and urbanization density and as a result increasing impermeable levels, led to an increase in the volume of urban runoff. Applying simulation models is a suitable way to know the amount of runoff quality parameters. This study aims at evaluating the quality of urban runoff in Shushtar city using storm water management model (SWMM).
Materials and Methods: Two given rainfall events in 1395 for calibration and validation of the model were considered. The parameters related to the first rainfall event were measured at the outlet of the urban drainage system. Quantitative and qualitative calibration of the model was performed using the first rainfall and model validation was performed using the second rainfall.
Results: In the hydraulic calibration, mean values of impermeability, slope, catchment width and manning coefficient were estimated to be 50%, 75%, 25 m and 0.013, respectively. In the qualitative calibration, the coefficients of the Build-up equations for TSS, COD and Zn were equal to 95-25, 48-1, 1- 0.09, respectively. The coefficients of Wash-off equations for TSS, COD and Zn were estimated 0.21- 0.8, 0.2-0.8 and 0.19-0.78, respectively.
Conclusion: The results showed that the accurate calibration of the model enhances the ability of the model to estimate the quantitative and qualitative parameters in future rainfall events for the study area. According to the results, the modeling is a powerful tool that can be very useful to improve runoff management.

کلیدواژه‌ها [English]

  • Urban runoff
  • Water quality parameters
  • Build-up and Wash-off coefficients
  • SWMM model
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