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SWMM模型徑流參數(shù)全局靈敏度分析
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國家自然科學(xué)基金資助項目(50879071,、51009065)


Global Sensitivity Analysis of Runoff Parameters of SWMM Model
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    摘要:

    選取基于Horton和Green—Ampt入滲模型的入滲參數(shù),以及區(qū)域坡度,、區(qū)域?qū)挾?、透水性區(qū)域的曼寧系數(shù)和可積水深度共7個SWMM模型參數(shù),,采用Morris方法進行全局靈敏度分析。并分別采用不同降水類型,、不同重現(xiàn)期的單個降水事件及長期降水序列,,分析各模型參數(shù)對總產(chǎn)流量、洪峰流量及徑流系數(shù)3個輸出變量的全局靈敏度,。結(jié)果表明:T1和T2型降水的參數(shù)靈敏度分析結(jié)果呈現(xiàn)較大差異,,T2型較小降水事件不適宜用于參數(shù)校核;對Horton入滲模型而言,,可利用T1型較大降水事件的洪峰流量對區(qū)域形狀系數(shù)進行校核,,利用T2型較大降水事件的總產(chǎn)流量對最小入滲速率、消減系數(shù)K進行校核,;對Green—Ampt入滲模型而言,,可利用T1型較小降水事件的洪峰流量對區(qū)域?qū)挾群推露冗M行校核及總產(chǎn)流量對透水性區(qū)域的曼寧系數(shù)進行校核,利用T2型較大降水事件的洪峰流量對最小入滲速率和缺水率進行校核,;對徑流系數(shù)而言,,采用Horton和Green—Ampt入滲模型的結(jié)果一致,最大入滲速率和最小入滲速率是最靈敏的兩個參數(shù),,透水性表面的可積水深度和曼寧系數(shù)為最不靈敏的兩個參數(shù),。

    Abstract:

    Based on practicability analysis of SWMM model parameters in the calibration process, four parameters of subcatchment slope, subcatchment width, Manning coefficient and depression depth on pervious area and three infiltration parameters were selected. Two popular infiltration models of Horton and Green—Ampt were examined respectively. Global sensitivity analysis method of Morris was used. Flow metrics of total rainfall depth and peak discharge were simulated for single rainfall events with different rainfall types and return periods while runoff coefficient was examined for the long-term rainfall data. Main results were: sensitivity analysis results for T1 and T2 rainfall events indicated great differences and T2 rainfall event with small return period was not suitable for parameters calibration; for Horton model, peak discharge of large T1 rainfall can be used for calibrating subcatchment width and slope while total runoff of large T2 can be used for calibrating infiltration parameters; for Green—Ampt model, peak discharge of small T1 rainfall can be used to calibrate subcatchement width and that of large T2 rainfall can be used to calibrate minimum infiltration rate and water deficiency; for the runoff coefficient, sensitivity analysis results of the two methods are similar.

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孫艷偉,把多鐸,王文川,姜體勝,王富強. SWMM模型徑流參數(shù)全局靈敏度分析[J].農(nóng)業(yè)機械學(xué)報,2012,43(7):42-49. Sun Yanwei, Ba Duoduo, Wang Wenchuan, Jiang Tisheng, Wang Fuqiang. Global Sensitivity Analysis of Runoff Parameters of SWMM Model[J]. Transactions of the Chinese Society for Agricultural Machinery,2012,43(7):42-49.

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  • 在線發(fā)布日期: 2012-07-02
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