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タイトルヨミ
ナカウミ コシンブ ニ オケル コテイ ノ スイチュウ エイゾウ ソノ5 : トウキ カラ シュンキ ノ キセツ ヘンカジ ニ オケル コテイ ノ ドウタイ
タイトル別表記
Pictures of bottom surface in the central part of Lake Nakaumi (part 5) : dynamics of bottom water in the time of seasonal change from winter to spring
ファイル
言語
日本語
著者
野村 律夫
高田 裕行
内容記述(抄録等)
A characteristic change of bottom sediment and benthic organisms occurs in early
spring, when the thermal structure of lake water changes from warm bottom to cold one and from cold surface to warm one (so-called spring turnover). Oxygen contents much decrease in the bottom water from this time on and winter-thriving cionids disappear in this season. We succeeded to take a picture of these changes in every two hours during April 5 to May 2, 2007.
The followings are our major results:
(1) Unclear water, consisting of suspended fine-grained particles, is normal in Lake Nakaumi, but it became more unclear when plankton productivity (as chlorophyll production) has much increased. Our pictures showed that the suspended particles were not only produced by the winnowing of bottom sediments, but also transported from other places. Clear bottom water was developed while the water level is high in Sakai-minato, Sea of Japan coast, which suggests the upward inflow of marine bottom water. Clear bottom water was not formed while the water level in Lake Nakaumi is higher in comparison with that of Sakai-minato.
(2) We confirmed again the bottom turbulence occurred over the wind speed of 10 m/s, when winter-thriving organisms, as cionids, become weak in activity, and then easily blew away with less than this wind speed. The bottom surface has much changed to a desolate surface with a new grown bacterial mat.
主題
spring turnover
unclear water
bottom turbulence
water dynamics
掲載誌名
Laguna : 汽水域研究
16
開始ページ
19
終了ページ
45
ISSN
21852995
発行日
2009-06
NCID
AN10439529
出版者
島根大学汽水域研究センター
資料タイプ
紀要論文
ファイル形式
PDF
著者版/出版社版
出版社版
業績ID
e10323
e18464
部局
研究・学術情報機構 エスチュアリー研究センター
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