Kazuki Nanko's Web Page
Last update: May 25, 2018


Senior Researcher
Department of Disaster Prevention, Meteorology and Hydrology
Forestry and Forest Products Research Institute (FFPRI)
Forest Research and Management Organization
National Research and Development Agency
Matsunosato 1, Tsukuba, Ibaraki 305-8687, Japan
Tel: +81-29-829-8240, Fax: +81-29-874-3720
Email: knanko[ at ]
Email: nanko-kazuki[ at ]
Skype: kazuki.nanko
ORCID (0000-0002-1157-9287) (F-4833-2010)
Google Scholar Citations

Curriculum Vitae

pdf Curriculum Vitae
KNanko-CV.pdf (update: May 25, 2018)
Adobe Acrobat Document [Download]


Research interest

I am interested in the cross-cutting science at interface of meteorology (wind, rainfall, snow, etc.), forestry, and soil science from ecohydrological and geomorphological perspectives. Specific interest is raindrops, rainfall redistribution process by forest canopy, tree sway and breakage mechanism by fluid (wind, avalanche, and tsunami), and soil erosion in mountainous forest area.

  • Ecohydrology
  • Hydrogeomorphology
  • Tree Biomechanics (and Ecomechanics)
  • raindrop; drop size distribution (DSD); erosivity; kinetic energy,
  • canopy interception; throughfall,
  • tree sway; tree breakage; windthrow; computational fluid dynamics,
  • splash erosion; splash detachment; soil erosion,
  • soil carbon; National Forest Soil Carbon Inventory,
  • Japanese cypress,
  • laser disdrometer, LDG (laser drop-sizing gauge)

Selected Publications

Brief Summary

Totally 35 peer-reviewed journal publications.
- 15 as top author / 20 as co-author.
- 28 in English / 7 in Japanese.

Throughfall Raindrops
  • Nanko, K., Watanabe, A., Hotta, N. and Suzuki, M. 2013. Physical interpretation of the difference in drop size distributions of leaf drips among tree species. Agricultural and Forest Meteorology 169: 74-84. DOI:10.1016/j.agrformet.2012.09.018
  • Nanko, K. and Hotta, N. and Suzuki, M. 2006. Evaluating the influence of canopy species and meteorological factors on throughfall drop size distribution. Journal of Hydrology 329: 422-431. DOI:10.1016/j.jhydrol.2006.02.036
  • Levia, D.F., Hudson, S.A., Llorens, P. and Nanko, K. 2017. Throughfall drop size distributions: a review and prospectus for future research. Wiley Interdisciplinary Reviews: Water 4: e1225. DOI:10.1002/wat2.1225Open access

Rainfall Redistribution by Forest Canopy
  • Nanko, K., Onda, Y., Ito, A. and Moriwaki, H. 2011. Spatial variability of throughfall under a single tree: Experimental study of rainfall amount, raindrops, and kinetic energy. Agricultural and Forest Meteorology 151: 1173-1182. DOI:10.1016/j.agrformet.2011.04.006
  • Nanko, K., Onda, Y., Kato, H. and Gomi, T. 2016. Immediate change in throughfall spatial distribution and canopy water balance after heavy thinning in a dense mature Japanese cypress plantation. Ecohydrology, 9: 300-314. DOI:10.1002/eco.1636

Rainfall Erosivity and Soil Erosion
  • Nanko, K., Mizugaki, S. and Onda, Y. 2008. Estimation of soil splash detachment rates on the forest floor of an unmanaged Japanese cypress plantation based on field measurements of throughfall drop sizes and velocities. Catena 72: 348-361. DOI:10.1016/j.catena.2007.07.002
  • Nanko, K., Giambelluca, T.W., Sutherland, R.A., Mudd, R.G., Nullet, M.A. and Ziegler, A.D. 2015. Erosion potential under Miconia calvescens stands on the Island of Hawai‘i. Land Degradation & Development 26: 218-226. DOI:10.1002/ldr.2200
  • Nanko, K., Moskalski S.M. and Torres, R. 2016. Rainfall erosivity–intensity relationships for normal rainfall events and a tropical cyclone on the US southeast coast. Journal of Hydrology, 534: 440-450. DOI:10.1016/j.jhydrol.2016.01.022

Soil Science
  • Nanko, K., Hashimoto, S., Miura, S., Ishizuka, S., Sakai, Y., Levia, D.F., Ugawa, S., Nishizono, T., Kitahara, F., Osone, Y. and Kaneko, S. 2017. Assessment of soil group, site and climatic effects on soil organic carbon stocks of topsoil in Japanese forests. European Journal of Soil Science 68: 547–558. DOI:10.1111/ejss.12444
  • Nanko, K., Ugawa, S., Hashimoto, S., Imaya, A., Kobayashi, M., Sakai, H., Ishizuka, S., Miura, S., Tanaka, N., Takahashi, M. and Kaneko, S. 2014. A pedotransfer function for estimating bulk density of forest soil in Japan affected by volcanic ash. Geoderma 213: 36-45. DOI:10.1016/j.geoderma.2013.07.025

Major international collaborators

  • Prof. Dr. Delphis F. Levia (University of Delaware, USA).
    Study on rainfall redistribution by forest canopy.
  • Dr. Yoann Weber (Imagination Technologies, UK).
    Study on throughfall rendering.
  • Prof. Dr. Thomas W. Giambelluca (University of Hawaiʻi at Manōa, USA).
    Study on soil erosion in invasive forest.
  • Prof. Dr. Raymond Torres (University of South Carolina, USA).
    Study on soil erosion process in salt marsh.

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