Numerical and experimental study on the risk of paddy field damage due to river bank breach during serious floods

  • Tetsuro TsujimotoEmail author
  • Kumiko Tsujimoto


In Japan, paddy fields located adjacent to rivers are a familiar landscape in rural areas, and they are divided from rivers by soil banks. Soil banks are easily breached by overtopping in floods. Previously, although soil banks were often breached in many locations, inundation in paddy fields was not necessarily a serious disaster, but it was rather positively accepted as a nutrient supplier to paddy fields. In addition, bank breaches at several sites decreased the flood discharge in a river and disasters were distributed into smaller scales. Over time, land use has changed from paddy fields to residential areas where inundation is obviously a disaster, and thus, banks have been improved to be safer against higher flood stages than what they used to be. Recently, more severe rainfall due to climate change and subsequent flooding has happened, and more serious damage has been brought by limited bank failure. As a result, limited bank breaches occur as concentrated drastic events. The damage is brought about not only by inundation, but also and more seriously by sediment balance in paddy fields: overflow from a river brings a larger amount of sediments into paddy fields such that rice plants are buried by them; in other cases, soil suitable for rice paddies as well as rice plants themselves is washed away by rapid flow from the river forming deep scour holes. The above-mentioned phenomena can be understood by small-scale laboratory experiments and numerical analysis by applying a two-dimensional hydraulic model for depth-averaged flow with a proper sediment transport model for the whole river-bank-paddy area. By using an analytical model, several discussions become possible: For example, locations of retention ponds can be designed to avoid bank breaches accompanying scouring and sedimentation during severe floods.


Paddy field damage Bank breach Inundation Scour and deposition 


  1. Ashida K, Michiue M (1972) Study on hydraulic resistance and sediment transport rate in alluvial stream. Trans JSCE 206:55–69Google Scholar
  2. Department of Water Management and Land Conservation, Ministry of land, infrastructure, transport and tourism (MLIT), manual for hazard map against flood disaster. Accessed 31 July 2018
  3. Engelund F (1974) Flow and bed topography in channel bend. J Hydraul Div ASCE 100(11):1631–1648Google Scholar
  4. Ferziger JH, Peirc M (1997) Computational method for fluid dynamics. Springer, Berlin, p 364Google Scholar
  5. Fujita Y, Tamura T (1972) Enlargement of breaches in flood levee on alluvial plains. J Nat Disaster Sci 9(1):37–60Google Scholar
  6. Goto T, Tsujimoto T, Kitamura T (2001) Advances in fluid modeling & turbulence measurements, edited by Ninokata et al. World Scientific, Singapore, pp 127–134Google Scholar
  7. Hasegawa K, Yamaoka S (1980) The effect of plane and bed forms of channels upon the meander development. J. Hydraul Coast Environ Eng JSCE 29:143–152Google Scholar
  8. Hokkaido Foundation for River Disaster Prevention Research Center: RIC-Nays. Accessed 31 July 2018
  9. Islam MS, Tsujimoto T (2012) Numerical approach to levee breach as a key of flood disasters in low land. Int J Civil Eng India 4(1):23–39Google Scholar
  10. Islam MS, Tashiro T, Tsujimoto T (2012) Laboratory experiments on levee breach and inundation in low-land with particular reference to relative height of river bed to floodplain. Int Rev Civil Eng Italy 3(3):251–258Google Scholar
  11. Tsujimoto T, Sumi T, Teramoto A, Maeda A (2005) Breaching process of flood levee affected by geometrical properties of rivers. Adv River Eng JSCE 11:121–126Google Scholar
  12. Tsujimoto T, Mizoguchi A, Maeda A (2006) Levee breach process of a river by overflow erosion. River Flow. In: International Conference on Fluvial Hydraulics. Lisbon, pp 1547–1555Google Scholar

Copyright information

© The International Society of Paddy and Water Environment Engineering 2019

Authors and Affiliations

  1. 1.Research Institute for River and Basin Integrated CommunicationsFoundation of River and Basin Integrated CommunicationsTokyoJapan
  2. 2.Graduate School of Environmental and Life ScienceOkayama UniversityOkayamaJapan

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