Knowledge Resource Center for Ecological Environment in Arid Area
ASSESSMENT OF THE SCS-CN INITIAL ABSTRACTION RATIO FOR PREDICTING RUNOFF TREATMENT VOLUMES DURING RAIN-ON-SNOW EVENTS | |
Al-Houri, Zain M.1; Barber, Michael E.2 | |
通讯作者 | Al-Houri, Zain M. |
来源期刊 | FRESENIUS ENVIRONMENTAL BULLETIN
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ISSN | 1018-4619 |
出版年 | 2011 |
卷号 | 20期号:9A页码:2391-2399 |
英文摘要 | The initial abstraction ratio (I(a)/S) in the original SCS-CN equation is generally assumed to be 0.20. However, mounting evidence indicates the I(a)/S ratio is not constant and is typically less than 0.20. The impact of this value on runoff prediction is considerable particularly in semi-arid climates where typical 6-month design storms are less than 2.54 cm of total effective precipitation. In addition, in cold climates, the presence of snow cover at the onset of rainfall influences the abstraction ratio and increases runoff volumes due to rapid snow melting. In this study, the validity of the currently used 0.20 value in semi-arid cold climate regions where most design storm runoff events are generated as a result of rain-on-snow events with frozen ground conditions was investigated. To accomplish this, a rainfall simulator system was developed to simulate rainfall on a 1.22 m wide x 2.44 m long plot. The programmable rainfall simulator produced rain intensities and durations according to the design hyetographs encountered in semi-arid cold regions. The artificial rainfall intensities were less than 3.5 mm/hr and durations were up to 30 hours. Runoff responses were simulated under different snow depths (2.5-10.0 cm), snow water equivalents (0.5-5.58 cm) and plot slopes (0-5%). These three parameters were used to propose an alternative methodology for assigning I(a)/S ratios. Data from 19 test runs were used to develop a multiple regression equation for application in Eastern Washington to demonstrate the utility of the methodology. The new methodology improves estimates of initial losses during rain-on-snow events. |
英文关键词 | stormwater management curve number SBUH method BMP design rainfall simulator |
类型 | Article |
语种 | 英语 |
国家 | Jordan ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000294979500007 |
WOS关键词 | CURVE NUMBER ; GENERATION |
WOS类目 | Environmental Sciences |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/168149 |
作者单位 | 1.Appl Sci Univ, Dept Civil Engn, Amman, Jordan; 2.Washington State Univ, Dept Civil & Environm Engn, Pullman, WA 99164 USA |
推荐引用方式 GB/T 7714 | Al-Houri, Zain M.,Barber, Michael E.. ASSESSMENT OF THE SCS-CN INITIAL ABSTRACTION RATIO FOR PREDICTING RUNOFF TREATMENT VOLUMES DURING RAIN-ON-SNOW EVENTS[J],2011,20(9A):2391-2399. |
APA | Al-Houri, Zain M.,&Barber, Michael E..(2011).ASSESSMENT OF THE SCS-CN INITIAL ABSTRACTION RATIO FOR PREDICTING RUNOFF TREATMENT VOLUMES DURING RAIN-ON-SNOW EVENTS.FRESENIUS ENVIRONMENTAL BULLETIN,20(9A),2391-2399. |
MLA | Al-Houri, Zain M.,et al."ASSESSMENT OF THE SCS-CN INITIAL ABSTRACTION RATIO FOR PREDICTING RUNOFF TREATMENT VOLUMES DURING RAIN-ON-SNOW EVENTS".FRESENIUS ENVIRONMENTAL BULLETIN 20.9A(2011):2391-2399. |
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