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河段溢流的二维扩散波法径流模拟

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河段溢流产生的非定向流会导致基于定向流的动力波水文分析算法在溢流段失效.为了提高河段溢流状况下的洪峰模拟精度,文章以重庆綦江流域为研究区域,应用GSSHA软件模型构建二维扩散波模型,模拟2020年"6.22"重庆綦江洪水灾害事件.通过对模型的参数优化,模拟流量与实测流量的洪峰误差百分比为0.34%,NSE系数为0.84,模拟的水文曲线与实测水文曲线整体上吻合较好.研究表明,构建的二维扩散波模型与动力波模型相比,提高了模拟精度,且可以有效解决在径流模拟中因河水溢流导致洪峰时间滞后且峰值减小的难题,对于复杂的水动力条件下的流域洪水预报提供了一定的理论依据和方法支撑.
Overbank Flow and Runoff Simulation Using Two-Dimensional Diffusion-Wave Method
As the hydrokinetic wave algorithm is based on the unidirectional flow assumption,it is not applicable to deal with the non-unidirectional flow generated by riverbank overflow.In order to accurately simulate the true physical overbank flow sce-nario,a two-dimensional diffusion wave method was applied in modeling the Qijiang flood disaster event that occurred in Chongq-ing on June 22,2020.The GSSHA(Gridded Surface Subsurface Hydrologic Analysis)model was used in this investigation.The simulated flood peak percentage error is 0.34%with parameter optimization,and the NSE coefficient is 0.84.Overall,there is good agreement between the measured and generated hydrographs.The research shows that compared with the dynamic wave model,the two-dimensional diffused wave model could improve the simulation accuracy and effectively solve the problem of flood peak time lag and peak height drop that caused by river overflow,which provids a theoretical basis and method support for flood prediction in the basin under complex hydrodynamic conditions.

two-dimensional diffusion waveoverland flowGSSHAflood simulation

付远航、丁永生

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上海海事大学海洋科学与工程学院,上海 201306

上海海事大学持久性有毒物质国际联合研究中心,上海 201306

二维扩散波 坡面流 GSSHA 洪水模拟

2023

水文
水利部水文局 水利部水利信息中心

水文

CSTPCDCSCD北大核心
影响因子:0.742
ISSN:1000-0852
年,卷(期):2023.43(6)
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