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准确掌握全新世特大古洪水流量,对于河流防洪减灾、水利工程建设和水资源合理开发调度具有重要的意义。文中利用HEC-RAS模型计算了汉江上游1983年、2005年和2010年的洪痕流量,与已有的研究成果相比,误差在5%以内。在此基础之上,利用相同的河流横断面和水文参数,选择合适的曼宁系数和河道比降,重建了汉江上游庹家洲河段的4期古洪水的洪峰流量,计算的古洪水洪峰流量符合Baker提出的流域面积和流域内特大洪水洪峰流量的关系。说明利用HEC-RAS模型来重建古洪水流量,准确、便捷、可行。其研究结果为重建古洪水流量提供了新的研究方法。
Accurate grasping of the ancient flood of Holocene flood is of great significance to flood control and disaster reduction, water conservancy project construction and rational development of water resources. The HEC-RAS model was used to calculate the flood discharge in the upper reaches of the Hanjiang River in 1983, 2005 and 2010. Compared with the existing research results, the error is within 5%. On this basis, using the same river cross-section and hydrological parameters, choosing the appropriate Manning coefficient and the river slope ratio to reconstruct the flood peak flow of the four ancient floods in the Qijiazhou reach in the upper Hanjiang River, The relationship between the catchment area proposed by Baker and the extra-large flood peak discharge in the basin. It shows that the HEC-RAS model can be used to reconstruct the floodwater flow accurately, conveniently, and practically. The results of this study provide a new research method for reconstructing ancient floods.