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感潮河川(北九州市紫川)の高濁度域における懸濁粒子の起源

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Title: 感潮河川(北九州市紫川)の高濁度域における懸濁粒子の起源
Other Titles: Origin of the Suspended Particles with High Turbidity Area in Murasaki River Estuary
Authors: 門谷, 茂1 Browse this author →KAKEN DB
三戸, 勇吾2 Browse this author
山田, 佳裕3 Browse this author →KAKEN DB
多田, 邦尚4 Browse this author →KAKEN DB
木田, 明典5 Browse this author
上田, 直子6 Browse this author
山田, 真知子7 Browse this author
Authors(alt): Montani, Shigeru1
Mito, Yugo2
Yamada, Yoshihiro3
Tada, Kuninao4
Kita, Akinori5
Ueda, Naoko6
Yamada, Machiko7
Keywords: turbidity
suspended particule
resuspension
stable isotope
Issue Date: Oct-2006
Publisher: 日本水環境学会
Journal Title: 水環境学会誌
Volume: 29
Issue: 10
Start Page: 635
End Page: 642
Publisher DOI: 10.2965/jswe.29.635
Abstract: To identify the cause of the high turbidity of the Murasaki River estuary, we investigated variations in suspended particle (SS) concentration and SS composition during the tide cycle in the Murasaki River estuary in June 2001 (rainy season) and September 2001 (nonrainy season). Additionally, the stable isotope ratio of carbon and nitrogen in the sediment and SS concentration and chemical composition were determined in the Murasaki River watershed over the investigation period. In September, the turbidity and SS concentration were high in the bottom layer. The SS compositions in the surface and middle layers depended on the tide phase, although in the bottom layer, SS composition did not depend on the tide phase. Moreover, the average SS composition in the bottom layer showed relatively low particulate organic carbon (POC) and chlorophyll a (Chl a) contents and high C/N and C/Chl a ratios, and the sinking particle compositions was similar to the SS composition in the bottom layer. This suggests that the origin of SSs in the bottom layer differed from those in the surface and middle layers, and the resuspension of sediment was a significant source of SSs during the nonrainy season. In June, the variation in SS composition in the surface layer did not correlate with tide level, and the average SS composition was similar to that in the river. This finding suggests that surface layer SSs were predominantly river-borne SSs. Sediments in the upper and middle reaches had a high δ 15N (+4.5‰∼+5.2‰) because of artificial pollution (small reservoir, agriculture effluent and human sewage). However, the δ 13C and δ 15N contents of the sediment in the Murasaki river estuary suggest that terrestrial C3 plants were the main source of organic matter in the sediment (δ 13C=-25.8‰, δ 15N=+2.9‰). Additionally, the δ 13C and δ 15N of sinking particles in the Murasaki river estuary suggest that the contribution of particles from the forest was higher in June (δ 13C=-25.2‰, δ 15N=+3.2‰) than in September (δ 13C=-24.4‰, δ 15N=+3.9‰). This suggests that the load from the forest brought when a storm was the main source of the organic matter in the the Murasaki River estuary sediments, and that the high turbidity of the Murasaki River estuary was caused by the resuspension of the sediment originating from the forest.
Type: article
URI: http://hdl.handle.net/2115/56726
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 門谷 茂

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