无资料地区设计洪水计算分析

Design Flood Calculation and Analysis in Data-Scarce Areas

无资料地区设计洪水计算一直是水文分析计算研究的热点和难点之一,为合理确定无资料地区的设计洪水,本研究以瓯江一级支流小安溪流域的某水库工程为研究对象,分别采用瞬时单位线法、地区综合法、水文比拟法、设计洪峰模系数等值线图法等多种方法计算水库坝址设计洪水。通过对比分析不同方法的适用性,从计算精度及设计安全性等角度考虑,推荐采用瞬时单位线法计算成果作为坝址设计洪水采用成果,本研究可为确定本流域及相近中小流域设计洪水提供一定的参考与借鉴。

The calculation of design flood in data-scarce areas has always been one of the significant challenges in hydrological analysis.To reasonably determine the design flood in such regions,this study takes a reservoir project in the Xiao'anxi River Basin,a first level tributary of the Oujiang River,as the research project.Various methods are used to calculate the design flood at the dam site,including instantaneous unit hydrograph method,regional synthesis method,hydrological analogy method,and design flood peak modulus isohyetal map method.Through comparative analysis of the applicability of these methods,considering factors such as calculation accuracy and design safety,the study recommends the use of the instantaneous unit hydrograph method as the most suitable for determining the design flood at the dam site.It provides valuable reference for determining the design flood in this basin and other similar small and medium-sized watersheds.