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Surface runoff hydrograph derivation using a dynamic wave based instantaneous unit hydrograph
Journal of Flood Risk Management ( IF 4.1 ) Pub Date : 2021-05-04 , DOI: 10.1111/jfr3.12722
Minyeob Jeong 1 , Dae‐Hong Kim 1 , Jongho Kim 2
Affiliation  

Rainfall-runoff models based on unit hydrographs and geomorphological instantaneous unit hydrographs have been widely used because of their simplicity and applicability. However, they are conceptual approaches, and not a reflection of physical phenomena. As an alternative, dynamic wave models have been introduced, but they are not appropriate for practical purposes because of their numerical instability and high computational cost. In this study, we present a hybrid method composed of a dynamic wave approach and instantaneous unit hydrograph (IUH) to predict surface runoff physically, stably, and instantly. We generate the S-hydrographs of a watershed using a dynamic wave model, and the IUHs of the watershed are derived by numerically differentiating the S-hydrographs with respect to time. Finally, a direct runoff hydrograph is produced through the convolution of the temporally varying rainfall excess rate and the IUHs of the watershed. A dynamic wave model is used, and therefore, only a single parameter related to friction needs to be calibrated for the S-hydrograph generation, and the nonlinearity of the rainfall-runoff process can be partially considered. From a computational perspective, the proposed method after the IUH derivation ends instantly and stably. Tests for ideal and real watersheds show good agreement between measurements and dynamic wave modelling results.

中文翻译:

使用基于动态波的瞬时单位水位线推导地表径流水位线

基于单位水位线和地貌瞬时单位水位线的降雨径流模型因其简单性和适用性而得到广泛应用。然而,它们是概念方法,而不是物理现象的反映。作为替代方案,已经引入了动态波模型,但由于其数值不稳定性和高计算成本,它们不适用于实际目的。在这项研究中,我们提出了一种由动态波方法和瞬时单位水位线 (IUH) 组成的混合方法,以物理、稳定和即时地预测地表径流。我们使用动态波浪模型生成流域的 S 水文图,并且流域的 IUH 是通过对 S 水文图相对于时间进行数值微分来推导出来的。最后,通过随时间变化的降雨过量率和流域的 IUH 的卷积产生直接径流水位线。由于采用动态波模型,因此S-hydrograph生成只需标定一个与摩擦有关的参数,可以部分考虑降雨-径流过程的非线性。从计算的角度来看,IUH推导后所提出的方法立即稳定地结束。理想和真实流域的测试表明测量结果与动态波浪建模结果之间具有良好的一致性。可以部分考虑降雨径流过程的非线性。从计算的角度来看,IUH推导后所提出的方法立即稳定地结束。理想和真实流域的测试表明测量结果与动态波浪建模结果之间具有良好的一致性。可以部分考虑降雨径流过程的非线性。从计算的角度来看,IUH推导后所提出的方法立即稳定地结束。理想和真实流域的测试表明测量结果与动态波浪建模结果之间具有良好的一致性。
更新日期:2021-05-04
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