Submerged Grove in Lake Onogawa.

Satoh, Yasuhiro; Nakamura, Soken; Ochiai, Masahiro

doi:10.3739/rikusui.56.45

Cited by 5 publications

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“…The maximum depth is 21 m, and it covers an area of 1.4 km 2 (Horie 1962). The water volume is approximately 0.014 km 3 (Satoh et al 1995). The trophic status of this lake is on the boundary between meso-and eutrophic (Satoh et al 1996).…”

Section: Methodsmentioning

confidence: 99%

Potential capacity of coprecipitation of dissolved organic carbon (DOC) with iron(III) precipitates

et al. 2006

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Section: Methodsmentioning

confidence: 99%

Potential capacity of coprecipitation of dissolved organic carbon (DOC) with iron(III) precipitates

et al. 2006

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“…However, the water level fluctuates significantly because the lake water is used for hydroelectric power generation. The lake covers 1.4 km 2 (Horie 1962) and the water volume is about 0.014 km 3 (Satoh et al 1995). The trophic status of the lake is thought to be on the boundary between meso-and eutrophic (Satoh et al 1996).…”

Section: Methodsmentioning

confidence: 99%

Perturbations of a water column of Lake Onogawa by local heavy rainfall

et al. 2001

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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 particulate 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 Ϫ1 and radii exceeding 2-3 µm.(2) A slowly sinking fraction with a sinking speed of about 10 cm day Ϫ1 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.

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“…Lake Onogawa lies 794 m above mean sea level, covers an area of 1.4 km 2 , and has a maximum depth of 21 m (Horie 1962). It contains 0.014 km 3 of water (Satoh et al 1995). Its trophic status is considered to be on the boundary between mesotrophic and eutrophic (Satoh et al 1996).…”

Section: Methodsmentioning

confidence: 99%

Factors controlling hypolimnetic ammonia accumulation in a lake

et al. 2002

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The factors controlling the degree of hypolimnetic ammonia accumulation in Lake Onogawa are discussed based on periodic observations since 1993. The standing stock of ammonia in the bottom 9 m of the water column was a good measurement for determining the extent of the hypolimnetic ammonia accumulation. It varied threefold from 144 mmol m Ϫ2 in 1998 to 429 mmol m Ϫ2 in 1996. The correlation between the annual maxima of the ammonia standing stocks and the annual maxima of the thickness of anoxic layers was significant at P ϭ 0.01. This fact suggests that the degree of development of the anoxic layer is the primary factor controlling the extent of hypolimnetic ammonia accumulation. Sporadic local heavy rainfalls in 1998 perturbed the water column, and the formation of the anoxic layer was postponed more than one month, resulting in a lower level of hypolimnetic ammonia accumulation in 1998. A thick mineral deposit apparently formed during the local heavy rainfall and seemed to enclose the freshly deposited organic matter, which might be an effective source material of the hypolimnetic ammonia, and resulted in a low level of ammonia accumulation in 1999. By 2000, the lake seems to have recovered from the perturbation, suggesting that the major part of the hypolimnetic ammonia is derived from fresh organic matter deposited within a year.

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Submerged Grove in Lake Onogawa.

Abstract: The first record by ultrasonic echo sounding on the distribution of the submerged

Cited by 5 publications

References 0 publications

Potential capacity of coprecipitation of dissolved organic carbon (DOC) with iron(III) precipitates

Potential capacity of coprecipitation of dissolved organic carbon (DOC) with iron(III) precipitates

Perturbations of a water column of Lake Onogawa by local heavy rainfall

Factors controlling hypolimnetic ammonia accumulation in a lake

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