Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s12517-020-06341-3 |
A comparative study of the estimation methods for NRCS curve number of natural arid basins and the impact on flash flood predications | |
Farran, Mohammed M.; Elfeki, Amro; Elhag, Mohamed; Chaabani, Anis | |
通讯作者 | Farran, MM (corresponding author), King Abdulaziz Univ, Fac Meteorol Environm & Arid Land Agr, Dept Hydrol & Water Resources Management, Jeddah, Saudi Arabia. |
来源期刊 | ARABIAN JOURNAL OF GEOSCIENCES
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ISSN | 1866-7511 |
EISSN | 1866-7538 |
出版年 | 2021 |
卷号 | 14期号:2 |
英文摘要 | There are various methods to estimate the curve number (CN) for flood studies. In the ungauged basins, hydrologists rely on the use of an NRCS-CN table called (CNdesign). The CNdesign, in this study, is estimated using remote sensing techniques and geographical information systems based on alluvium-rock-vegetation classification of natural basins. However, in gauged basins, it is common to use rainfall-runoff data through the application of the least-squares method (LSM) to get the best CN value (CNobs), or the asymptotic fitting method (AFM) to obtain asymptotic CN (CN infinity). A comparison between these methods is made under the effect of changing both the coefficient of abstraction ratio, lambda, and the effect of data sorting techniques to find out the best estimation of CN for reliable prediction of floods. A methodology has been developed to convert the NRCS-CN table values at lambda =0.2 to lambda =0.01 for arid basins. The relationship between the observed CN and the NRCS-CN table shows that estimating runoff using lambda =0.2 is best made by CN of the impervious area (CNimp=90) instead of 98 (for urban areas) used in the literature. The highest value of CN between the methods is the CNdesign, then CNobs. CN infinity shows the lowest value. Therefore, for a safe design of the hydraulic structures, it is recommended to use CNdesign. However, for the simulation of the rainfall (P)-runoff (Q) process in the natural basins, it is recommended to use CNobs at the natural sorting of data pairs (P: Q). The root mean square error (RMSE) of CN is reduced from 11 at CNimp=98 to 7 at CNimp=90. This value reflects the infiltration process in the rocks due to the high density of fractures and fissures in the mountains in the area. The developed NRCS-CN table at lambda =0.01 reduces the RMSE of the estimated runoff depth by 57%. |
英文关键词 | Curve number (CN) Asymptotic fitting method (AFM) Least-squares method (LSM) Geographic information system (GIS) Arid basins Saudi Arabia |
类型 | Article |
语种 | 英语 |
收录类别 | SCI-E |
WOS记录号 | WOS:000609876100003 |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/347724 |
作者单位 | [Farran, Mohammed M.; Elhag, Mohamed; Chaabani, Anis] King Abdulaziz Univ, Fac Meteorol Environm & Arid Land Agr, Dept Hydrol & Water Resources Management, Jeddah, Saudi Arabia; [Elhag, Mohamed] Chinese Acad Sci, Inst Remote Sensing & Digital Earth RADI, Beijing 100094, Peoples R China; [Elhag, Mohamed] German Univ Technol Oman, Dept Appl Geosci, Fac Sci, Muscat 1816, Oman |
推荐引用方式 GB/T 7714 | Farran, Mohammed M.,Elfeki, Amro,Elhag, Mohamed,et al. A comparative study of the estimation methods for NRCS curve number of natural arid basins and the impact on flash flood predications[J],2021,14(2). |
APA | Farran, Mohammed M.,Elfeki, Amro,Elhag, Mohamed,&Chaabani, Anis.(2021).A comparative study of the estimation methods for NRCS curve number of natural arid basins and the impact on flash flood predications.ARABIAN JOURNAL OF GEOSCIENCES,14(2). |
MLA | Farran, Mohammed M.,et al."A comparative study of the estimation methods for NRCS curve number of natural arid basins and the impact on flash flood predications".ARABIAN JOURNAL OF GEOSCIENCES 14.2(2021). |
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