Study of Temporal and Spatial Variations of Road-Deposit Environments with Modeled-Stormwater Sampling Technique

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  • NIHEI Yasuo
    Dept. of Civil Eng., Faculty of Science and Technology, Tokyo University of Science
  • SUNADA Takahiko
    Dept. of Civil Eng., Graduate School of Science and Technology, Tokyo University of Science
  • MIZUNO Tomoyuki
    Zenitaka Corporation

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  • 模擬降雨流出水採取法に基づく路面塵埃環境の時間的・空間的変動特性の把握
  • モギ コウウ リュウシュツスイ サイシュホウ ニ モトヅク ロメン ジンアイ カンキョウ ノ ジカンテキ クウカンテキ ヘンドウ トクセイ ノ ハアク

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Abstract

As a new monitoring technique for road-deposit environments, one of main nonpoint sources in urban areas, we present a modeled-stormwater sampling (MOS) technique in which one can easily obtain road deposits under modeled rainy conditions. To simulate a rainy condition using the MOS technique, we first stir water placed on a road surface and collect the water with suspended matter detached from the road surface. We then analyze the quality of the water samples obtained. To confirm the validity of the MOS technique, we conduct a laboratory experiment for the comparison of road-deposit environments measured with the MOS and those measured using other monitoring techniques. The experimental results indicate that the road-deposit environments measured using the MOS technique show the same results as those measured using an artificial rainfall technique, indicating the fundamental high performance of the MOS technique. Using the MOS technique, we perform field measurements of the temporal and spatial variations of road-deposit environments in urban areas. The observed results indicate that rainfall and traffic may cause appreciable variations of road-deposit environments in time and space.

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