We present a method to estimate the spatial distribution of sediment by using chemical composition and particle-size distribution. We applied the method to samples of sediment from Keihin Unga, Tokyo Bay, Japan. The chemical composition was analyzed by wavelength dispersive X-ray spectrometry. For particle-size analysis, organic matter was removed from sediment using H
2O
2. The spatial distribution of chemical composition and sediment removed organic matter showed clearly the distribution of impacts of sediments from the Tama River and Tokyo bay. The result demonstrates the feasibility of the method to reduce uncertainty in interpreting the spatial distribution of impacts of sediment from some sources.
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