Spatial evaluation of sediment production rates by grain size based on topographical, geological and soil features in mountainous watersheds

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In this study, field observations on suspended sediment transport were carried out to evaluate fine sediment production rates in upstream sites of the Sendai River basin. And mapping of soil characteristics in the Kakuto Basin were carried out to detect dominant producing areas of fine sediments. As a result of these observations, it is clarified that the Hatsuki River basin, the most major branch of the upper Sendai River, is an area of a relatively high sediment production rate and that the southern part of Okuchi basin is on a depositional trend. In addition, a possibility of area classification on the space scale comparable to small watersheds based on elementary composition of soil is indicated.