土木学会論文集B1(水工学)
Online ISSN : 2185-467X
ISSN-L : 2185-467X
水工学論文集第55巻
諏訪湖におけるヒシの試験刈り取りが水塊構造に及ぼす影響
豊田 政史加藤 宏章今井 晶子宮原 裕一
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2011 年 67 巻 4 号 p. I_1465-I_1470

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Numerous attempts have been conducted in order to recover emergent plants and submerged plants in various lakes. However, floating-leaved plants, which make water quality worse, have been rarely focused. The purpose of this paper is to evaluate the effect of mowing down the floating-leaved plants area partially in Lake Suwa, where floating-leaved plants-dominated state is observed in shallow zone. We measure water temperature, turbidity and water velocity inside and outside of the floating-leaved plants area. It is confirmed that 1) The variation range of water temperature inside of floating-leaved plants area is smaller than that of outside. 2) Floating-leaved plants lessen the vertical water circulation. 3) Outside of floating-leaved plants area is easier to be influenced by cold water than inside when cold water intrude into water grass area. 4) Turbidity inside of floating-leaved plants area is higher than outside. 5) The leaves of floating-leaved plants become the resistance of surface current.

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