CHANGES IN DEPTH AND THE SEDIMENT RATE BEFORE AND AFTER THE LAKESHORE DEVELOPMENT IN LAKE FUKAMI-IKE, JAPAN

Authors

  • Maki Oyagi
  • Megumi Nobori
  • Hiromi Ssuda
  • Akiko Yokoyama
  • Akihiko Yagi

Keywords:

Eutrophic lake, Sediment rate, Ttransparency, Lakeshore development

Abstract

Changes in depth and decrease of the sediment rate before and after a building breakhead
maintenance construction were studied in small monomictic and eutrophic Lake Fukami-ike in central Japan.
The maintenance of farm village drainage and the waterfront function was carried out for the activation of the
town in 1992, and the water quality improvement was expected. However, variations of transparency were
observed and no blue-green algal bloom outbreak had occurred before recently observed. Maximum depth
changed from 9.3 m (1951), 8.5 m (1979), 8.1 cm (1992) to 7.8 m (2012), respectively. Changes in the
autochthonous and allochthonous matters in the lake were thus considered. Sediment rates of 19.5 ± 10.19 gm-2
d1 (1978 to 1979) and 4.40 ± 2.27 gm-2
d-1 (2007 to 2008) were observed, and decreased 22.6%. These deposition
rate data corresponded to 3.1 cm year-1 (1979) and 1.2 cmyear-1 (2009), respectively. The decreased percentage
of organic matter and the reduced deposition rate were because rice fields and forest around the lake give way to
take concrete roads. It was considered to be because the inflow of sediment stopped when it rained, and
allochthonous inorganic matter was significantly reduced.

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Published

2017-10-13

How to Cite

Maki Oyagi, Megumi Nobori, Hiromi Ssuda, Akiko Yokoyama, & Akihiko Yagi. (2017). CHANGES IN DEPTH AND THE SEDIMENT RATE BEFORE AND AFTER THE LAKESHORE DEVELOPMENT IN LAKE FUKAMI-IKE, JAPAN. GEOMATE Journal, 11(26), 2547–2552. Retrieved from https://geomatejournal.com/geomate/article/view/2614

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