Perturbations of a water column of Lake Onogawa by local heavy rainfall |
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Authors: | Y Satoh M Sasaki Y Miyamori K Sugawara T Nishi M Nishizuka K Inamura Y Yamagami |
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Institution: | (1) Faculty of Science, Yamagata University, 1-4-12 Koshirakawa machi Yamagata 990-8560, Japan Tel. +81-23-628-4589; Fax +81-23-628-4510 e-mail: hirosato@sci.kj.yamagata-u.ac.jp, JP |
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Abstract: | The perturbations of a water column at the deepest part of Lake Onogawa by a local heavy rainfall were analyzed. Mixing throughout
the water column (18.8-m deep) was indicated by changes in the distribution of water temperature. This mixing perturbed the
hypolimnetic seasonal distributions of dissolved components. All partic-ulate components peaked at 10 m, suggesting a center
of inflowing water. Compared with background levels, particulate nitrogen (PN), particulate carbon (PC), particulate phosphorus
(PP), and suspended solids (SS) increased from 16-fold for PN to 100-fold for SS. Soluble reactive phosphorus was the only
dissolved component that formed a clear maximum at 10 m, as did the particulate components. Assuming that SS consists mainly
of mineral particles, SS can be classified into three categories: (1) A rapidly sinking fraction, the main body of the loaded
SS, with a sinking rate exceeding 1 m day−1 and radii exceeding 2–3 μm. (2) A slowly sinking fraction with a sinking speed of about 10 cm day−1 and radii of 0.7–0.9 μm; this fraction is calculated to be about 4% of the total loaded SS at most. (3) A fraction that was
essentially retained in the water column. The maximum estimate of this fraction was 0.5% of the total.
Received: January 1, 2000 / Accepted: August 10, 2000 |
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Keywords: | Heavy allochthonous load Material distribution Ventilation SS sinking rate |
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