Measurement Method of Turbidity Depth Profiles using ADCP for Monitoring of Coastal Sea Area

  • Arai Rei
    Osaka Prefecture University Graduate School of Engneering
  • Nakatani Naoki
    Osaka Prefecture University Graduate School of Engneering
  • Okuno Taketoshi
    Osaka Prefecture University Graduate School of Engneering

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Other Title
  • 海域モニタリングに適したADCPを用いた濁度の鉛直分布計測手法
  • カイイキ モニタリング ニ テキシタ ADCP オ モチイタ ダクド ノ エンチョク ブンプ ケイソク シュホウ

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Abstract

At stormy weather, dredging and filling operation and so on, the water with high concentrations of solids arises in coastal sea area. Growth of seaweed and algae is obstructed to interrupt sunlight by water with this high turbidity. To make matters worse, sediments has the character to adsorb the nutrient and organic matter on those surfaces. Water involved high concentration of solids with nutrient and organic matter make seawater and seabed polluted. In order to improve them, it is very important to measure the spatial and temporal variability of solids dynamics and to monitor the coastal environment.In this study, the authors proposed a new measurement method of solids depth profiles by using Acoustic Doppler Current Profilers (ADCP). Authors regarded the propagation of ultrasonic waves as inverse problems in underwater and modeled these factors, which influences the propagation of ultrasonic waves. By using ADCP and optical turbidity sensor, the depth profile of the solids concentration can be measured. Since ADCP can be obtained the three-dimensional velocity, the present method is suitable for monitoring in order to understand the solids dynamics in seawater.

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