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河道自净系数K值试验,是研究河道纳污能力的重要环节,在自净系数K值试验中,河段平均流速的计算方法及结果确定,直接影响着K值试验成果。在以往的试验中,采用浮标法者居多,该法主要适用试验河段顺直、距离相对较短、水流条件良好的大中河流。实际工作中即使满足上述条件,要取得浮标在试验河段中的运行速度,也是非常困难的。在一些水流情势复杂或流速较小的中、小河流,特别是试验河段较长的河流,在上断面投放的浮标,能成功到达下断面的很少
The experiment of K value of river self-purification coefficient is an important part of researching riverbed pollutant carrying capacity. In the self-purification coefficient K value test, the calculation method and result of average velocity of river reach determine the K value test results directly. In the past experiments, buoys were mostly used. The method is mainly applied to large and medium rivers with straight run, relatively short distance and good water flow conditions. Even in the actual work to meet the above conditions, it is very difficult to get the buoy speed in the experimental section. In some medium-sized and small rivers with complicated water flow conditions or small flow velocities, especially those with long test river sections, the buoys put on the upper section can successfully reach the lower section