In this paper we present monitoring data of stream waters that may reflect acidic impacts on the island as well as the rainwater qualities. The pH ranges of the river water in the Kawara streams in the western part of the island and the Yodogo stream in the central part of the island were 5.71-6.35 and 5.85-6.12 during 1992-1999, respectively. The concentrations of SO42− and NO3− in the river water were lower than those in the rainwater. Many differences were observed among the sampling sites. Higher concentrations of acid substances are found in the stream waters of the western area compared to the other areas. On the other hand, sulfuric acid is the major acid in the rainwater, snow and rime ice. No differences were observed in the ion constituents of the rainwater collected in the areas. These results suggested that the densely growing canopy may play a role in holding air pollutants, and acidic substances deposited on the canopy would be discharged as a through-fall and a stem flow. Furthermore, the water mass containing high ionic substances in the western area has been held in the groundwater layer, continuously supplying the stream waters during dry weather days. On the other hand, part of the basic runoff will be diluted with a surface runoff during the rainy days. As a result, the concentrations of the ionic substances in the stream waters during rainy days decreased.
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Research Article|
October 01 2001
Runoff of acidic substances that originated from atmospheric deposition on Yakushima Island, a world natural heritage site Available to Purchase
O. Nagafuchi;
O. Nagafuchi
*Fukuoka Institute of Health and Environmental Sciences, 39 Mukaizano, Dazaifu, Fukuoka 818-0135, Japan
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H. Kakimoto;
H. Kakimoto
**Kyushu Environmental Evaluation Association, 1-10-1 Matsukadai, Higashi-ku, Fukuoka 813-0004, Japan
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S. Ebise;
S. Ebise
***Department of Civil Engineering, Setsunan University, 17-8 Ikeda-nagamachi, Neyagawa, Osaka 572-8508, Japan
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T. Inoue;
T. Inoue
†Department of Civil Engineering, Gifu University, 1-1 Yanagido, Gifu city, Gifu 501-1193, Japan
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M. Koga
M. Koga
‡Prefectural University of Kumamoto, 3-1 Tsukide, Kumamoto, Kumamoto 862-0920, Japan
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Water Sci Technol (2001) 44 (7): 57–62.
Citation
O. Nagafuchi, H. Kakimoto, S. Ebise, T. Inoue, M. Koga; Runoff of acidic substances that originated from atmospheric deposition on Yakushima Island, a world natural heritage site. Water Sci Technol 1 October 2001; 44 (7): 57–62. doi: https://doi.org/10.2166/wst.2001.0389
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