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Author Ajmal, Muhammad ♦ Kim, Tae Woong ♦ Ahn, Jae Hyun
Source SpringerLink
Content type Text
Publisher Springer Berlin Heidelberg
File Format PDF
Copyright Year ©2016
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences
Subject Keyword Rainfall ♦ Land use/cover ♦ Runoff ♦ Parameterization ♦ Prediction ♦ Earth Sciences
Abstract The credibility and wide acceptance of the curve number (CN) method are rooted in its simplicity, convenience, authoritative agency support, absence of a strong competitor, and versatility to estimate runoff especially from ungauged watershed. Numerous studies have reported that the application of the tabulated CN (CN$_{Tab}$) and the fixed initial abstraction ratio (λ = 0.20) to estimate the runoff volume is inferior. In the current study, we investigated the applicability of λ = 0.20 and its successful modification to λ = 0.05 using the CN$_{Tab}$ and other calibrated CNs based on the measured rainfall-runoff data. In addition, with a fixed CN$_{Tab}$, the value of λ was reduced to 0.01 and 0.0 in order to evaluate the runoff variability response for 587 storm events from 10 South Korean forest-dominated mountainous watersheds. Both for λ = 0.20 and λ = 0.05, the application of CN$_{Tab}$ exhibited poor results in all of the watersheds based on quantitative statistics using four performance evaluation indicators. The application of the calibrated CN increased the runoff prediction capability of the CN method both for λ = 0.20 and λ = 0.05. Using λ = 0.05 and its adjusted calibrated CN depicted a modest improvement in the results. Among the different calibrated CN variants, the asymptotic method was comparatively appropriate. However, the method still needs improvement for a consistent CN. Interestingly, for the unaltered CN$_{Tab}$, the λ = 0.01 and λ = 0.0 exhibited very consistent results for the estimation of runoff from watersheds. Therefore, it is more tempting for application in ungauged watersheds without deterioration of the CN model’s versatility and simplicity.
ISSN 18667511
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2016-05-02
Publisher Place Berlin, Heidelberg
e-ISSN 18667538
Journal Arabian Journal of Geosciences
Volume Number 9
Issue Number 5
Page Count 14
Starting Page 1
Ending Page 14


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Source: SpringerLink