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| | Development of the Model for Detailed Estimation for Exposure Concentration of Chemicals in River Basin |
 | | Particularly, the information of exposure concentration of chemical substances with toxicity to aquatic organisms in river basin is not adequately known because of limited number of observation sites and sampling periods, and it is often very difficult to assess their impacts to the ecological system. |
 | | In fiscal 2002, the development of river basin exposure analysis model taking into consideration of emission, river flow rate, sewerage, land use and other geographical data was started, and river basin exposure analysis models for the Tama River Basin, the Kanto Plain and the Yodogawa River Basin were developed. |
 | | The SHANEL is a dynamic analysis model with mass transfer mechanism, such as desorption to suspended solids in river water, adsorption to soil, settling and resuspension of suspended solids between the river water and sediment, which enable to estimate exposure concentrations of chemicals readily accumulated in river sediment and soil. |
| www.aist.go.jp /aist_e/latest_research/2005/20050323_2/20050323_2.html (1445 words) |
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