日本海洋学会誌
Online ISSN : 2186-3113
Print ISSN : 0029-8131
ISSN-L : 0029-8131
江田内湾における海底高濁度層の季節変動
谷本 照巳星加 章
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1991 年 47 巻 6 号 p. 286-296

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The beam attenuation coefficient, organic carbon (POC) and organic nitrogen (PON) contents of suspended materials in Etauchi Bay, which has little inflow of river water as well as very weak tidal current (maximum speed: 6.5cm·sec-1), were measured as a function of depth for all seasons to understand a seasonal variation of bottom turbidity layer. In spring and summer, the beam attenuation coefficient in bottom layer and POC and PON contents of suspended materials in the surface water layer increased with time, which brought the occurrence of the bottom turbidity layer. From autumn to winter, however, their concentrations became low and constant over the whole depth almost independent of time. As a result, the bottom turbidity layer disappeared in winter and beam attenuation coefficient became constant over the whole depth. From these results, it may be considered that the bottom turbidity layer was produced by phytodetritus brought from surface water layer, rather than by resuspension of bottom sediment in Etauchi Bay.

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