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三江顶托下乐山城区设计水面线计算探讨
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Abstract:
同频率地区组成法和典型年法广泛地应用于干支流交汇地区设计洪水计算中，但两种方法均有各自的局限性，目前对于两种方法的适用性比较研究还很少。本文以乐山市中心城区设计水面线计算为例，探讨了同频率地区组成法和典型年法在三江相互顶托下的适用性。结果表明，相对于同频率组成法，典型年法以实际发生的洪水组成作为样本进行洪水分配，方法简单易行，多个典型年能更加全面反映区域的洪水组成特点，在乐山区域更加适用。但典型年的代表性需要结合地区暴雨洪水特点以及地区实际合理确定。
The equivalent frequency regional composition (EFRC) method and the typical year method are widely used in the design flood calculation in the area of confluence of main streams and tributaries. However, there are few comparative studies on the limitations and applicability of these two methods. Taking the calculation of the design water surface profile in the central area of Leshan City as an example. The application of the EFRC method and the typical year method under the backwater influence of three rivers is discussed in this paper. The results demonstrate that the typical year method utilizes the actual flood composition as a sample for flood allocation, which is more straightforward and readily implementable in comparison with the EFRC method. In addition, multiple typical years can more comprehensively reflect the regional flood composition, which is more applicable in Leshan City. However, the representativeness of the typical year needs to be appropriately determined by the characteristics of the regional storm floods, as well as the actual situation in the region.
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