Abstract
This study deals with environmental changes and lake-catchment processes in a small pond-catchment system (Takidani-ike) in central Japan to make clear sedimentary conditions related to changes in erosional force (rainfall intensity) and erosible condition (area) of the lake-catchment system. Continuous instrumental observations were used for quantitative data analyses and proper process-understanding. The observations include sediment sampling with trap, water level measurement, and precipitation measurement. Observational results show that changes in physical properties are basically due to precipitation; increase in precipitation is related to increase in grain density, mineral content and mineral grain size. Large change in bottom erodible area are mainly related to seasonal irrigation. Analytical results indicate that the sedimentation rate can be expressed as a function of both external factor (precipitation intensity) and system factor (increase in erodible area from water level changes). The correlation of multiple regression analysis for the seasonal relationship is better than that for the monthly relationship, suggesting that reservoir effect in the catchment should be considered.
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