Effect of Nutrient Inputs on Water Quality Change and Phytoplankton Growth in Atsumi Bay

Teuku Mahlil; Takanobu Inoue; Yoshitaka Matsumoto; Shinichi Aoki; Shigeru Kato; Kuriko Yokota; Ernawaty Rasul; Makoto Saga

doi:10.5614/j.eng.technol.sci.2018.50.4.7

Authors

Teuku Mahlil Universitas Pertamina, Department of Environmental Engineering, Jalan Teuku Nyak Arief, Simprug, Jakarta Selatan, Jakarta 12220,
Takanobu Inoue Toyohashi University of Technology, Departments of Architecture and Civil Engineering, 1-1 Hibarigaoka, Tenpaku-cho, Toyohashi, Aichi 441-8580,
Yoshitaka Matsumoto Toyota National College of Technology, Departments of Civil Engineering, 2-1 Eisei-cho, Toyota, Aichi 471-8525,
Shinichi Aoki Graduate School of Engineering Osaka University, Departments of Civil Engineering, 2-1 Yamadaoka, Suita, Osaka 565-0871
Shigeru Kato Toyohashi University of Technology, Departments of Architecture and Civil Engineering, 1-1 Hibarigaoka, Tenpaku-cho, Toyohashi, Aichi 441-8580,
Kuriko Yokota Toyohashi University of Technology, Departments of Architecture and Civil Engineering, 1-1 Hibarigaoka, Tenpaku-cho, Toyohashi, Aichi 441-8580,
Ernawaty Rasul Ministry of Health Republic of Indonesia, Environmental Health Engineering and Disease Control Office Makassar, Jalan Wijaya Kusuma Raya No. 29-31, Makassar, South Sulawesi 90224,
Makoto Saga Toyohashi University of Technology, Departments of Architecture and Civil Engineering, 1-1 Hibarigaoka, Tenpaku-cho, Toyohashi, Aichi 441-8580,

DOI:

https://doi.org/10.5614/j.eng.technol.sci.2018.50.4.7

Keywords:

Atsumi Bay, chlorophyll a, eutrophication, nitrogen, phosphorus, rainfall, Umeda River.

Abstract

Eutrophication in an estuary occurs as an effect of the enrichment of nutrient inputs from rivers. This condition has become one of the most common environmental issues experienced around the globe and especially in Japan. Atsumi Bay is a eutrophic coastal area in Japan. The objective of this research was to analyze the influences of nutrient inputs from the Umeda River into Atsumi Bay on pre- and post-rainfall water quality conditions. This study was conducted from July to October 2010. The results showed a decrease of surface salinity after rainfall indicating that huge freshwater inputs had overlaid the surface layer of Atsumi Bay rather than the bottom layer. Moreover, post-rainfall conditions showed an increase of chlorophyll a as an effect of phytoplankton growth, followed by an increase of particulate nutrients. On the other hand, dissolved nutrients decreased due to uptake by phytoplankton and dilution by freshwater.

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