Arid
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
ISSN1018-4619
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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