盤洲干潟における潮汐に伴う水質変動に関する現地観測  [in Japanese] Fluctuations of Water Quality during a Tidal Cycle in Banzu Tidal Flat  [in Japanese]

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Author(s)

    • 野村 宗弘 NOMURA Munehiro
    • 独立行政法人港湾空港技術研究所海洋・水工部 Marine Environment and Engineering Department, Port and Airport Research Institute, Independent Administrative Institution
    • 中村 由行 NAKAMURA Yoshiyuki
    • 独立行政法人港湾空港技術研究所海洋・水工部 Marine Environment and Engineering Department, Port and Airport Research Institute, Independent Administrative Institution

Abstract

Field observations were carried out in Banzu intertidal flat in Tokyo Bay throughout two days in the summer of 2000, in order to clarify the spatiotemporal fluctuatuions of water quality during a tidal cycle. Concentrations of DO, ON (TN-DIN) or OP (TP-PO<sub>4</sub>-P) at the offshore station were higher than those at the onshore station, whereas DIN and PO<sub>4</sub>-P had an inverse trend, during submergence. During flood tides, an abrupt increase in the concentrations of DIN and PO<sub>4</sub>-P was observed around a shoreline.<br>We constructed a box model, incorporating both the release flux of inorganic nutrients from sediment and the nutrient uptake rate by overlaying water, that were experimentally obtained <i>in situ</i> at each tide. The observed fluctuation of nutrients during ebb tide was well reproduced by the model. However, agreement was poor during flood tide. These results strongly indicate that the increase in nutrient concentrations during flood tide was attributed to the temporally increased effluxes of nutrients from the sediment and/or the physical resuspension of sediments at the shoreline.<br>The mass balance of TP during a tidal cycle showed that the tidal flat acted as a sink of TP (1<i>μ</i>mol·m<sup>-2</sup>·h<sup>-1</sup>) during daytime, in turn, source of TP (30<i>μ</i>mol·m<sup>-2</sup>·h<sup>-1</sup>) during nighttime. The influx of organic N and organic P to the tidal flat and the efflux of inorganic nutrients from the tidal flat were commonly dominant processes when evaluated through a tidal cycle. Possibility that the light intensity during exposure affect the sediment-water flux of nutrients was indicated.

Journal

  • Journal of Japan Society on Water Environment

    Journal of Japan Society on Water Environment 25(4), 217-225, 2002-04-10

    Japan Society on Water Environment

References:  21

Cited by:  4

Codes

  • NII Article ID (NAID)
    10008006703
  • NII NACSIS-CAT ID (NCID)
    AN10372439
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09168958
  • NDL Article ID
    6133829
  • NDL Source Classification
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No.
    Z16-1045
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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