Laguna : 汽水域研究

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Laguna : 汽水域研究 2
1995-03 発行

汽水域・塩分躍層の動態長期観測システムの開発(予報)

Development of the Long-term Observation System for Wedge-like Saline Layer Formation in Coastal Lagoon (Preliminary Report)
Tokuoka, Takao
Takayasu, Katsumi
Inouchi, Yoshio
Nishimura, Kiyokazu
Anma, Kei
Suzaki, Satoshi
Matsuda, Shigeo
Yamanaka, Tadashi
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Description
We have developed the survey system for wedge-like saline layer formation and preliminarily checked the resolution of underwater acoustic records in Lakes Nakaumi and Shinji (Coastal lagoons) and Ohashi River. This survey system, which automatically provides a time-series of echo-sounding profiles, is different from the conventional type equipped on a boat. The transducer is fixed on the lake bottom. The echo-sounding record obtained by the new system is clear enough to distinguish the 5%o. halocline. Wedge-like saline layers have distinctly been observed at I .0-1.5m above the lake bottom in Lake Nakaumi.