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首页> 外文会议>International Conference on Fluvial Hydraulics Vol.2, Sep 4-6, 2002, Louvain-LA-Neuve, Belgium >In-situ checking the performance of bed-load samplers by underwater video
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In-situ checking the performance of bed-load samplers by underwater video

机译：通过水下视频现场检查床载采样器的性能

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摘要

The process of bed-load transport and the performance of two sampler types (Karolyi and Helley-Smith) were studied in the field with the help of an underwater video camera mounted on the sampler's body. The phenomenon was viewed on board of the measuring vessel on the monitor of a video recorder connected with the camera. Effective sampling was restricted to part of the total measuring time. The rates of bed load transport obtained with the actual sampling time were more reliable than those calculated with the total time for which the sampler rested on the bottom. The main reasons for poor effectiveness were imperfect support of the sampler on the bottom and the high hydraulic resistance caused mainly by clogging of the wire mesh basket in which the trapped sediment was collected.
机译：借助于安装在采样器主体上的水下摄像机，在野外研究了床载运输过程和两种采样器类型（Karolyi和Helley-Smith）的性能。在与摄像机连接的录像机的监视器上的测量容器上可以看到该现象。有效采样仅限于总测量时间的一部分。实际采样时间获得的床面负荷传输速率比采样器搁在底部的总时间所计算的速率更可靠。效果欠佳的主要原因是采样器在底部的支撑不完善，以及高水力阻力，主要是由于收集被捕集的沉积物的金属丝网篮堵塞所致。

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