| Autor: |
Kazunori Maeda, Yuichi Hayami, Takaharu Hamada |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Estuarine, Coastal and Shelf Science. 163:290-296 |
| ISSN: |
0272-7714 |
| DOI: |
10.1016/j.ecss.2014.11.029 |
| Popis: |
This study analyzed the long time record of transparency (Secchi disk depth) in the inner area of Ariake Sea and determined the reason for the change. The data observed by the Saga Prefectural Ariake Fisheries Research and Development Center for 38 years at 10 or 11 stations was used. The Secchi disk depth increased significantly in autumn and winter. The analysis based on the 1 dimensional model of surface salinity and the SS concentration showed that the increase in Secchi disk depth would be caused by the decline of the SS supply at the source. It also suggested that there would have been an additional SS source existed in the bay head before 1984. It is coincident with the construction of the Chikugo Ozeki weir and the channel bed dredging. The channel bed depth of the Chikugo River estuary increased largely from 60's to 80's by dredging and became almost stable after 1985. Provided that the Chikugo River estuary was an additional SS source, the decline of the SS supply would be generated by the upstream displacement of the turbidity maximum induced by the increase in channel bed depth. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect