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2008•土木学会論文集B2(海岸工学)Open access

Dynamic Characteristics of Salinity and Chlorophyll-a at the Mouth of Isahaya Bay during Summer Season in 2007

Kenta Takenouchi, Akihide TADA, Takehiro Nakamura, Eijirou MORI

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Abstract

In order to reveal the characteristics of current structures and salinity & Chlorophyll-a dynamics at the mouth of Isahaya Bay, this study deals with in situ measurement by means of not only the Acoustic Doppler Current Profiler (ADCP) butalso a water quality instrument. The obtained results are as follows:(1) It was realized that the freshwater inflow fromrivers has a great influence on the dynamic behavior of salinity at the mouth of Isahaya Bay.(2) The major axis of M2 tidal current ellipse turns more counterclockwise due to the freshwater inflow from rivers.(3) The concentration of Chlorophyll-a is influenced by the tidal motion. That is, the high concentration of Chlorophyll-a often occurs after neaptide.

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In order to reveal the characteristics of current structures and salinity & Chlorophyll-a dynamics at the mouth of Isahaya Bay, this study deals with in situ measurement by means of not only the Acoustic Doppler Current Profiler (ADCP) butalso a water quality instrument. The obtained results are as follows:(1) It was realized that the freshwater inflow fromrivers has a great influence on the dynamic behavior of salinity at the mouth of Isahaya Bay.(2) The major axis of M2 tidal current ellipse turns more counterclockwise due to the freshwater inflow from rivers.(3) The concentration of Chlorophyll-a is influenced by the tidal motion. That is, the high concentration of Chlorophyll-a often occurs after neaptide.

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Available abstract

In order to reveal the characteristics of current structures and salinity & Chlorophyll-a dynamics at the mouth of Isahaya Bay, this study deals with in situ measurement by means of not only the Acoustic Doppler Current Profiler (ADCP) butalso a water quality instrument. The obtained results are as follows:(1) It was realized that the freshwater inflow fromrivers has a great influence on the dynamic behavior of salinity at the mouth of Isahaya Bay.(2) The major axis of M2 tidal current ellipse turns more counterclockwise due to the freshwater inflow from rivers.(3) The concentration of Chlorophyll-a is influenced by the tidal motion. That is, the high concentration of Chlorophyll-a often occurs after neaptide.

Key concepts: Bay, Salinity, Acoustic Doppler current profiler, Inflow, Chlorophyll a, Current (fluid), Environmental science, Oceanography

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Dynamic Characteristics of Salinity and Chlorophyll-a at the Mouth of Isahaya Bay during Summer Season in 2007 — Research Paper | ScholarLens