This article takes the Sigou River in Xinmi City as an example,uses a combination of Civil 3D and HEC-Ras to analyze the water surface line of the torrent ditch under the design frequency flood,and proposes a full-process design method for the longitudinal section of the torrent ditch.Based on Civil 3D and HEC-Ras,the water surface line of complex river channels and river networks can be calculated quickly,which greatly improves the efficiency of water surface line calculation.Compared with the traditional water surface line calculation and modeling methods,it has the advantages of convenient water surface line calculation,reasonable calculation method and high calculation accuracy.
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