J. Technology and Education, Vol.26, No.1, pp.1-9 (2019)
研究論文
門池の水質と水深
竹口 昌之*、髙橋 駿平、芳野 広起、鈴木 裕貴、渡辺 彩夏、勝又 俊貴、
松下 真太郎、三輪 史朗、松本 祐子、芳野 恭士
沼津工業高等専門学校 物質工学科（〒410-8501 静岡県沼津市大岡3600）
*takeguch@numazu-nct.ac.jp
Masayuki TAKEGUCHI, Shunpei
TAKAHASHI, Hiroki YOSHINO, Yuki SUZUKI, Ayaka WATANABE, Shunki
KATSUMATA, Shintaro
MATSUSHITA, Shiro MIWA, Yuko MATSUMOTO, Kyoji YOSHINO
National
Institute of Technology, Numazu College (3600 Ooka,
Numazu, Shizuoka 410-8501, Japan)
(Received November
9, 2018; Accepted January 6, 2019)
Abstract
Algal bloom is a serious problem in Kado-ike, an irrigation pond in
Numazu City, Shizuoka. Therefore, it is important to understand the
relationships among water quality and topographic features. In this study, we
surveyed the water quality and measured the water depth at 14 sites in Kado-ike on September 19, 2015. In Kado-ike, the water color was dark green, and algal
bloom was seen mainly in the area close to the outlet. The pH of the water at
any point in Kado-ike was
8 or more alkaline, making it suitable for the proliferation of algae. The
chemical oxygen demand (COD) and various nitrogen and phosphorus compounds in
the area close to the inlet were higher than at other sites. These results show
good agreement with computational fluid dynamics solutions. Kado-ike
was roughly divided into two areas in the results of water depth measurements:
the east area, at a depth of 3 meters, and the west area, at a depth of 4
meters. COD and ammonia nitrogen at any pond bottom were higher than those at
the water surfaces, and it is thought that suspended solids accumulate.
Keywords: Water quality, Water depth, Algal bloom, Computational fluid dynamics, Kado-ike