1. Study Subject

1. Sediment Supply and Transport Processes in Mountain Area

  Landslide and debris flow sometimes cause severe sediment disasters in mountain areas. In order to prevent these disasters, we need to control occurrence of landslides and debris flows by countermeasures (e.g., check dams, earth retaining works).

  Sediment supply and transport processes in steep mountains is not sufficiently understood because of the difficulty in field investigation. I am trying to clarify these processes by various investigation techniques, including GIS analysis of LiDAR data, UAV-SfM, aerial photo interpretation, field measurement, and field monitoring.

  In order to understand sediment supply and transport processes, we sometimes need to investigate wide but bad-access mountain areas. I am also trying to develop new and effective investigation methods in mountain area.

Related papers

Imaizumi, F., Ikeda, A., Yamamoto, K., Ohsaka, O. (2021) Temporal changes in the debris flow threshold under the effects of ground freezing and sediment storage on Mt. Fuji. Earth Surface Dynamics, 9, 1381-1398. https://doi.org/10.5194/esurf-9-1381-2021 

Imaizumi, F., Masui, T., Yokota, Y., Tsunetaka, H., Hayakawa, Y.S., Hotta, N. (2019) Initiation and runout characteristics of debris flow surges in Ohya landslide scar, Japan, Geomorphology, 339, 58-69,  https://doi.org/10.1016/j.geomorph.2019.04.026

de Haas, T., Densmore, A.L., Stoffel, M., Suwa, H., Imaizumi, F., Ballesteros-Cánovas, J.A. Wasklewicz, T. (2018) Avulsions and the spatio-temporal evolution of debris-flow fans, Earth-Science Reviews, 117, 53-75, https://doi.org/10.1016/j.earscirev.2017.11.007

Imaizumi, F, Nishiguchi, T, Matsuoka, N, Trappmann, D, Markus, S (2018) Interpretation of recent alpine landscape system evolution using geomorphic mapping and L-band InSAR analyses , Geomorphology, 130, 125-137,  https://doi.org/10.1016/j.geomorph.2018.03.013

Imaizumi, F., Hayakawa, Y. S., Hotta, N., Tsunetaka, H., Ohsaka, O., Tsuchiya, S. (2017) Relationship between the accumulation of sediment storage and debris-flow characteristics in a debris-flow initiation zone, Ohya landslide body, Japan, Natural Hazards and Earth Science Systems, 17, 1923-1938, https://doi.org/10.5194/nhess-17-1923-2017

2. Role of Vegetation on Sediment Supply and Transport Processes

  Sediment supply and transport processes are affected by various factors(e.g., geology, topography, climate, forest vegetation). In these factors, forest vegetation can be controlled easily for wide area by human being. Therefore, knowledge on the role of forest vegetation on sediment supply and transport processes are important to manage sediment and water in watersheds. I am trying to clarify effect of forest vegetation on sediment supply and transport processes in artificial and natural forests.

landslides and debris flows in artificial forests, central Japan

Related papers

Imaizumi, F., Sidle, R. C. (2021) Effects of terrain on the occurrence of debris flows after forest harvesting, Geografiska Annaler: Series A, Physical Geography, 103, 1-14. https://doi.org/10.1080/04353676.2021.1932482

Evans, J.R., Imaizumi, F., Ohsaka, O., Ogawa, S. (2020) Relationship between tree height and landslide characteristics obtained by GIS assessment. Earth Surface Processes and Landforms, 45, 3280-3292. https://doi.org/10.1002/esp.4964

Imaizumi, F., Nishii, R., Ueno, K., Kurobe, K. (2019) Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment, Hydrology and Earth System Sciences, 23, 155-170, https://doi.org/10.5194/hess-23-155-2019

Imaizumi, F., Sidle, R. C. （2012）Effect of forest harvesting on hydrogeomorphic processes in steep terrain of central Japan, Geomorphology, 169, 109-122, https://doi.org/10.1016/j.geomorph.2012.04.017

Imaizumi, F., Sidle, R.C., Kamei, R. (2008) Effects of forest harvesting on the occurrence of landslides and debris flows in steep terrain of central Japan, Earth Surface Processes and Landforms, 33, 827-840, https://doi.org/10.1002/esp.1574