کمّی‌سازی بازگشت‌پذیری سیستم زهکشی شهری بر اساس ارزیابی عملکرد هیدرولیکی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای مهندسی محیط‌زیست- منابع آب، دانشگاه تهران، تهران، ایران

2 دانشیار،‌ دانشکده محیط زیست، دانشگاه تهران، تهران، ایران

3 استادیار، دانشکده محیط زیست، دانشگاه تهران، تهران، ایران

چکیده

با وجود پیشرفت‌های قابل توجه در زمینه مدیریت پایدار سیستم‌های زهکشی رواناب شهری (UDSs)، این قبیل زیرساخت‌ها در معرض تهدید روزافزون محرک‌های غیر قطعی تغییرات آینده قرار دارند. کمّی‌سازی بازگشت‌پذیری، گامی مهم در راستای افزایش بلندمدت پایداری مناطق شهری تحت پوشش سیستم‌های زهکشی رواناب است. در پژوهش حاضر از طریق ترکیب عملکرد هیدرولیکی شبکه زهکشی رواناب سطحی با تابع عملکرد سیستم، به کمّی‌سازی بازگشت‌پذیری این شبکه‌ها در مقابله با سیل پرداخته شد. به این منظور پس از تعیین مقادیر بارش، حدّی برای دوره‌ بازگشت‌های مختلف، شبیه‌سازی هیدرولوژیکی و هیدرودینامیکی سیستم جمع‌آوری آب‌های سطحی حوضه سیل‌برگردان غرب در تهران با دو سناریوی وجود و عدم وجود بهترین اقدامات مدیریتی (BMP) صورت گرفت. سپس این روش برای یکی از گره‌های سیلابی شبکه به‌کار گرفته شد و میزان عملکرد و بازگشت‌پذیری سیستم در این گره انتخابی تحت بارش‌های حدی با دوره‌بازگشت‌های مختلف برآورد شد. نتایج نشان داد که با اضافه نمودن یک جوی‌باغچه به سیستم زهکشی شهری، مدت سیل گرفتگی در گره منتخب شبکه و حجم آبگرفتگی به‌ترتیب تا میزان 15 و 47 درصد کاهش یافته و بازگشت‌پذیری نسبت به سیل از 37/0 درصد تا 89/5 درصد افزایش می‌یابد. بنابراین وجود راهکارهای توسعه کم‌اثر (LID)همراه شبکه سنتی زهکشی شهری می‌تواند در افزایش پایداری سیستم مؤثر باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Quantifying Resilience of Urban Drainage Systems Based on the Hydraulic Performance Assessment

نویسندگان [English]

  • Negin Binesh 1
  • Mohammad Hossein Niksokhan 2
  • Amin Sarang 3
1 PhD. Student of Environmental Engineering-Water Resources, University of Tehran, Tehran, Iran
2 Assoc. Prof., Faculty of Environment, University of Tehran, Tehran, Iran
3 Assist. Prof., Faculty of Environment, University of Tehran, Tehran, Iran
چکیده [English]

Sustainable management of Urban Drainage Systems (UDSs) is challenging since the hydraulic characteristics and pollutants discharged into catchment areas are constantly changing. Quantifying the resilience of UDSs is a crucial step towards long-term and sustainable management of these chatments in urban areas. This study was performed to evaluate the resilience of UDSs against flooding through combining hydraulic performance of stormwater drainage network with the system performance function. To conduct this performance evaluation extreme rainfall intensity values for different return year periods ranging from 2 to 100 years were used for catchment drained into the West Flood-Diversion (WFD) system in Tehran. Both hydraulic and hydrodynamic simulations were performed for these stormwater drainage system under two scenarios: with and without BMPs. To further evaluate the systems performance and resilience, additional simulation analysis was performed using one specific flooded node under extreme rainfalls with different return periods. The results showed that adding a vegetative swale to the drainage system would decrease the nodal flooding duration and the flood volume up to 15% and 47%, respectively. The results also shown that the resilience against flooding will increase from about 0.4% up to 6% under the above-mentioned conditions. From the results of this study, we can conclude that employing some types of BMP along with the existence low-impact development measures within the traditional urban drainage areas may be sufficient to increase the system resilience and sustainable control of flooding.

کلیدواژه‌ها [English]

  • Resilience
  • Performance Function
  • Urban Drainage System (UDS)
  • Management Practices
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