ダウンロード数 : ?
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1 : フウソク ヘンカ ニ タイスル テイソウスイ ノ ドウタイ
タイトル別表記
Lake fl oor images in the central part of Lake Nakaumi(part 1) : wind speed impacts on bottom water motion
ファイル
言語
日本語
著者
野村 律夫
堀江 譲
高田 裕行
内容記述(抄録等)
A long-term monitoring waterproof camera was installed on the bottom of Lake Nakaumi at a depth of 6.5 m, in order to observe bottom water movements and the ecology of brackish organisms. Over a six day period, Nov. 4–Nov. 9 2006, brackish water dynamics changed from stable to unstable conditions. Under the prior stable conditions, the sediment surface was covered with a bacterial mat. Strong winds, over 15 m/s, mixed upper and bottom water masses and the halocline disappeared for a short time in the middle of this period.
We show that winnowing of bottom sediments occurs at wind speeds greater than 10 m/s at this location; a small piece of bacterial mat was stripped off from the bottom sediment. When wind speed increased to greater than 12–13 m/s, bottom water turbulence was increased, with larger pieces of bacterial mat and sediment particles several centimeters in diamerter being resuspended. Water clarity decreased at this time. The bacterial mat was completely stripped off the sediment surface when wind speed exceeded 16 m/s. Suspended sediment caused water clarity to go to zero at this time.
Fish appeared in bottom waters soon after the wind-driven disruption of stratified water conditions, suggesting that oxygen-rich upper water were well mixed into oxygen-poor bottom water.
主題
waterproof camera
long-term monitoring
bottom water
winnowing
wind speed
掲載誌名
Laguna : 汽水域研究
14
開始ページ
17
終了ページ
24
ISSN
21852995
発行日
2007-12
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
部局
研究・学術情報機構 エスチュアリー研究センター
このエントリーをはてなブックマークに追加