论文部分内容阅读
针对无资料或缺资料中小河流洪水预报问题,基于地貌瞬时单位线(GIUH)理论,利用更符合水文物理规律的伽玛分布函数来代替一般GIUH理论中的指数分布概率密度函数,考虑坡面汇流的传播时间,将坡地作为特殊河流计入地貌瞬时单位线,建立了具有水动力学基础的两参数伽玛分布GIUH汇流模型,采用Eagleson-Bras经验公式推求水动力学参数,采用半经验方法计算特征河长,减弱了模型对实测资料的依赖,并将该模型应用于广西西江水系双和流域。结果表明,利用该模型模拟的各场次洪水确定性系数均值为0.83,合格率为80%,模拟结果较好。
Aiming at the problem of small river flood forecasting without data or lack of data, based on the theory of terrain instantaneous unit line (GIUH), the probability density function of exponential distribution in general GIUH theory is replaced by the gamma distribution function which is more accordant to hydrological and physical laws. , The slopes as a special river into the geomorphological instantaneous unit line, established a two-parameter GIUH confluence model with hydrodynamic basis, using hydrodynamic parameters Eagleson-Bras empirical formula to calculate the semi-empirical method The characteristics of the river length, weakened the dependence of the model on the measured data, and applied the model to the Shuanghe River basin in the Xijiang River of Guangxi. The results show that the mean of certainty coefficient of flood of each session simulated by this model is 0.83, the pass rate is 80%, and the simulation result is better.