Entrainment of bottom sediment in the Seto Inland Sea in summer |
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| Authors: | Kichiichiro Kawana Terumi Tanimoto Takashi Ichiye |
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| Institution: | (1) Government Industrial Research Institute, Chugoku 15000 Hiromachi Kure, 737-01 Hiroshima, Japan;(2) Department of Oceanograpy, Texas A&M University College Station, 77843, Texas, USA |
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| Abstract: | Time series of the vertical distribution of resuspended matter and bottom current were collected concurrently during summer at a few anchored stations in the Seto Inland Sea. The vertical distribution of resuspended matter was measured every hour for about one tidal cycle and the three components of current fluctuation were obtained at each sampling station. Current data at each sampling station show that the bottom is hydraulically smooth.Assuming that the averaged vertical distribution of resuspended matter for one tidal cycle shows a steady state distribution, the settling velocityWs of resuspended matter is estimated to be in the range of 1.2×10–2 to 5.7×10–2 cm sec–1 from analysis of the averaged distributions.The relation between the erosion rate and the bottom shear stress for this study area is investigated and is compared with that for other areas. The results show that the erosion of sediment in the Seto Inland Sea during summer occurs even due to the low bottom shear stress which is considered as almost smooth hydraulically. |
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