瀬戸内海水島港周辺域の懸濁粒子（ＳＳ）の輸送特性

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タイトル別名
  • MOVEMENT CHARACTERISTICS OF SUSPENDED SOLIDS AROUND MIZUSHIMA PORT IN THE SETO INLAND SEA

説明

Field experiments to investigate the movement characteristics of suspended solids around Mizushima Port in the Seto Inland Sea were performed throughout winter (1-18 March), the rainy season (30 June-18 July), and summer (21 August-7 September) of 2006. To characterize the distribution of suspended solids, physical observations, including current, temperature and salinity were conducted, in addition to observations of turbidity and suspended solid concentrations. As a result of field analysis, the Mizushima area was divided into three areas: the western part of Mizushima Port, the mouth of Takahashi River and the eastern part of Mizushima Port. In the western Mizushima Port sediment suspension appeared predominately in the bottom layer in conjunction with tidal currents. As a result, tidal currents were identified as the main contributor to sediment suspension in this area. At the mouth of the Takahashi River the relative maximum concentration appeared at both the surface and bottom. The depth of the high suspended solid layer was greatest when the river discharge was large, and hence surface water impurity is dependent on river discharge. In the final area, the eastern part of Mizushima Port, suspended solid concentrations were distributed lower and uniformly throughout the water column due to rough sediments and strong tidal currents.

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