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洪水流量是大中桥设计的重要依据。由于流量系列在时程上的无限性和所具有的不确定因素,使设计要求的频率流量值很难从理论上予以解决。因此,利用实测资料和调查的特大洪水推求设计流量,是现实可行的重要途径。六十年代以后,我国通常采用的皮尔逊Ⅲ型曲线图解适线法,能比较灵活地综合考虑多种因素,且较简便。其主要缺点是目估适线,因人
Flood flow is an important basis for the design of Dazhong Bridge. Due to the unlimited time series and the uncertainties of the flow series, it is difficult to theoretically solve the frequency-flow value required by the design. Therefore, the use of measured data and surveys of extra-large floods to derive design flow is an important and feasible way. Since the 1960s, the Pearson Ⅲ curve fitting method commonly used in our country can be more flexible and comprehensively considering a variety of factors, and is simpler. The main disadvantage is the assessment of fitness line, due to people