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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Acknowledgements
We thank Mr. and Mrs. Yoshida for their kindness and their support in observing the rain gauge near Takidani-ike. I am grateful to Dr. K. Fukushi, our colleagues from the Hydro-geomorphological Laboratory and Isotope-geochemical Laboratory, Kanazawa University, and members of Study Abroad Program from National Taiwan University, and Kyung Hee University for cooperation to obtain sediment from Takidani-ike, and Ishikawa Pref., for providing us with the rainfall data from two stations around the catchment. We appreciate the valuable discussion with Prof. N. Hasebe and our colleagues in the Hydro-geomorphological Laboratory and Isotope-geochemical Laboratory at Kanazawa University and staffs in Earth Science Course, Kanazawa University, for their support of this study. We thank Japan Society for the Promotion of Science for Young Scientists for support of this study.
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Itono, T., Kashiwaya, K. & Ochiai, S. A Study of Sedimentary Environments Based on Long-term Observation in a Small Lake-catchment System in Central Japan. Environ. Process. 7, 615–630 (2020). https://doi.org/10.1007/s40710-020-00433-8
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DOI: https://doi.org/10.1007/s40710-020-00433-8