Author(s): Tatsuhito Onoi; Yasuo Nihei
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Keywords: Marine litter; Flood; Floating-litter transport; Temporal variation in water elevation
Abstract: To evaluate accurately temporal variations of floating-litter transport L in rivers, we present a new rating curve using the temporal variation rate of water elevation H (5). For this purpose, we measured the floating-litter transport L in the Edogawa River flowing into Tokyo Bay, Japan, in two flooding events. In field measurements, we used a rectangular frame for directly collecting floating litter and video monitoring for recording floating litter. The measured results indicate that the peak of the floating-litter transport L appeared in the rising stage of the flooding and the temporal variations of L during the flooding are similar to those of the temporal variation rate in water elevation H (5). It should also be noted that a new rating curve using the correlation between L and H (5) has higher accuracy for evaluating L than a primitive rating curve using L-Q relations in which Q means river discharge.
Year: 2012