在水利规划设计、流域性河道管理和洪水预报等工作中,河渠水面曲线的应用,较为频繁,计算工作量较大。对于大、中型河道,特别是天然河道,长距离等速流的情况极少,基本上皆属于明渠变速流。对标准棱柱体变速流河道,利用公式或表格、曲线等 In water conservancy planning and design, river basin watershed management and flood forecasting, the application of river surface water curves is more frequent and the calculation workload is larger. For large and medium-sized river, especially natural river, long-distance islet flow is rare, basically belong to open channel flow. Standard prismatic variable speed flow of rivers, the use of formulas or tables, curves and so on