A Calibrated, Watershed-Specific SCS-CN Method: Application to Wangjiaqiao Watershed in the Three Gorges Area, China

被引：27

作者：

Ling, Lloyd ^{[1
,5
]}

Yusop, Zulkifli ^{[2
]}

Yap, Wun-She ^{[1
]}

Tan, Wei Lun ^{[1
]}

Chow, Ming Fai ^{[3
]}

Ling, Joan Lucille ^{[4
]}

机构：

[1] Univ Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long 43000, Kajang, Malaysia

[2] Univ Teknol Malaysia, Ctr Environm Sustainabil & Water Secur, Skudai 81310, Malaysia

[3] Univ Tenaga Nas, Inst Energy Infrastruct, Kajang 43000, Malaysia

[4] Taylors Univ, Dept Liberal Arts & Languages, Amer Degree Programme, 1 Jalan Taylors, Subang Jaya 47500, Malaysia

[5] Univ Tunku Abdul Rahman, Lee Kong Chian Fac Engn & Sci, Dept Civil Engn, Kajang 43000, Malaysia

来源：

WATER | 2020年 / 12卷 / 01期

关键词：

SCS; initial abstraction ratio; curve number; bootstrap; rainfall-runoff model; CURVE NUMBER METHOD; INITIAL ABSTRACTION RATIO; SURFACE RUNOFF; LOESS PLATEAU; SOIL-EROSION; MODEL; SIMULATION; GUIDELINES; PARAMETERS; VEGETATION;

D O I：

10.3390/w12010060

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The Soil Conservation Service curve number ( SCS-CN) method is one of the most popular methods used to compute runoff amount due to its few input parameters. However, recent studies challenged the inconsistent runoff results obtained by the method which set the initial abstraction ratio l as 0.20. This paper developed a watershed-specific SCS-CN calibration method using non-parametric inferential statistics with rainfall-runoff data pairs. The proposed method first analyzed the data and generated confidence intervals to determine the optimum values for SCS-CN model calibration. Subsequently, the runoff depth and curve number were calculated. The proposed method outperformed the runoff prediction accuracy of the asymptotic curve number fitting method, linear regression model and the conventional SCS-CN model with the highest Nash-Sutcliffe index value of 0.825, the lowest residual sum of squares value of 133.04 and the lowest prediction error. It reduced the residual sum of squares by 66% and the model prediction errors by 96% when compared to the conventional SCS-CN model. The estimated curve number was 72.28, with the confidence interval ranging from 62.06 to 78.00 at a 0.01 confidence interval level for the Wangjiaqiao watershed in China.

引用

页数：14