| کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
|---|---|---|---|---|
| 4388611 | 1618007 | 2016 | 6 صفحه PDF | دانلود رایگان |
کلمات کلیدی
1.مقدمه
2-مواد و روشها
2-1- ناحیه مورد مطالعه
2-2- بررسی ساختار مدل
3.نتایج و بحث
3-1- اعتبار سنجی مدل سه بعدی
3-2- بررسی رویدادهای بارندگی در سال پیش فرض
3-3- نتایج مدلهای تجزیه و تحلیل
4- نتیجه گیری
تصویر 1- مکان مورد مطالعه
تصویر 2- رویکرد شبیه سازی مدل سه بعدی
تصویر-3- PCT برای داده های شبیه سازی شده (TS = مجموع مواد جامد؛ AgI = متوسط بارش باران؛ ADD = روزهای خشک قبل از بارش؛ RD = مدت بارش).
تصویر -4- رویدادهای بارش باران در سال 2003
تصویر 5 و 6- (5) مقایسه سه رویداد بارندگی و (6) مقایسه بر مبنای ARI 6ماهه برای هر چهار حوضه آبریزش
• Presents approach for selecting rainfall events for stormwater treatment design.
• Selecting high intensity-short duration events is the most effective for design.
• Stormwater treatment design based on more frequent events is the most feasible.
The current approach for protecting the receiving water environment from urban stormwater pollution is the adoption of structural measures commonly referred to as Water Sensitive Urban Design (WSUD). The treatment efficiency of WSUD measures closely depends on the design of the specific treatment units. As stormwater quality is influenced by rainfall characteristics, the selection of appropriate rainfall events for treatment design is essential to ensure the effectiveness of WSUD systems. Based on extensive field investigations in four urban residential catchments based at Gold Coast, Australia, and computer modelling, this paper details a technically robust approach for the selection of rainfall events for stormwater treatment design using a three-component model. The modelling results confirmed that high intensity-short duration events produce 58.0% of TS load while they only generated 29.1% of total runoff volume. Additionally, rainfall events smaller than 6-month average recurrence interval (ARI) generates a greater cumulative runoff volume (68.4% of the total annual runoff volume) and TS load (68.6% of the TS load exported) than the rainfall events larger than 6-month ARI. The results suggest that for the study catchments, stormwater treatment design could be based on the rainfall which had a mean value of 31 mm/h average intensity and 0.4 h duration. These outcomes also confirmed that selecting smaller ARI rainfall events with high intensity-short duration as the threshold for treatment system design is the most feasible approach since these events cumulatively generate a major portion of the annual pollutant load compared to the other types of events, despite producing a relatively smaller runoff volume. This implies that designs based on small and more frequent rainfall events rather than larger rainfall events would be appropriate in the context of efficiency in treatment performance, cost-effectiveness and possible savings in land area needed.
Journal: Ecological Engineering - Volume 92, July 2016, Pages 67–72