Extraction of Chemical Parameters Characterizing the Upper, the Middle and Lower Stream by CQSAR
- The Case of the Tamagawa River, Tokyo, Japan -

Junko KAMBEa, Yuan YANb, Umpei NAGASHIMAc,d* and Tomoo AOYAMAb

aFaculty of Foreign Language, Daito Bunka University
1-9-1 Takashimadaira, Itabashi, Tokyo 175-8571, Japan
bFaculty of Engineering, University of Miyazaki
Gakuenkihanadai Nishi, Miyazaki 889-2192 Japan
cResearch Institute for Computational Science, National Institute for Advanced Industrial Science and Technology
1-1-1 Umezono, Tsukuba, Ibaraki 305-8565 Japan
dCore Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST)
Kawaguchi Center Building, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012 Japan

(Received: April 11, 2006; Accepted for publication: June 23, 2006; Published on Web: August 23, 2006)

We attempted to extract chemical parameters characterizing the upper, middle and lower stream of the Tamagawa River in Tokyo, Japan, by Compensation Quantitative Structure-Activity Relationships (CQSAR) method [11, 12] for analysis of incomplete data by perceptron type neural network with three layers.
Dissolved Oxygen (DO) and Total Phosphorus (T-P) were extracted from 12 chemical parameters (Table 2) at 17 points (Table 1) along the main stream of the Tamagawa River (Figure 1) in Tokyo, Japan, for 1997-2001 [10].
DO indicated that water pollution became worse at all points of the Tamagawa River (Figure 4) but T-P shows that water pollution is changed for the better in the middle and the lower stream (Figure 5).
This result suggests that the water pollution is more drastic in the middle stream of the Tamagawa River than the lower stream. The water pollution in the middle stream should be decreased for keeping the Tamagawa River clean.

Keywords: Water pollution, Tamagawa River, Compensation quantitative structure activity relationship (CQSAR), Dissolved oxygen (DO), Total phosphorus(T-P)

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