Japan Geoscience Union Meeting 2016

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW16] Water and material transport and cycles in catchment ecosystems: from headwater to coastal area

Thu. May 26, 2016 3:30 PM - 4:45 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Seiko Yoshikawa(Narional Institute for Agro-Environmental Sciences), Masahiro Kobayashi(Forestry and Forest Products Research Institute), Noboru Okuda(Research Institute for Humanity and Nature), Shin-ichi Onodera(Graduate School of Integrated and Arts Sciences, Hiroshima University), Kazuhisa Chikita(Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University), Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Shinji Nakaya(Department of Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University), Mitsuyo Saito(Graduate School of Environmental and Life Science, Okayama University)

3:30 PM - 4:45 PM

[AHW16-P03] Quantitative relationship between sediment storage in dam reservoir and coastal erosion as the basis of future sediment management and planning

*Yoshiyuki Yokoo1, Keiko Udo2 (1.Fukushima University, 2.Tohoku University)

Keywords:Dam reservoir, Coastal erosion, Future prediction, Sediment, River flow quantity, Turbidity

Toward comprehensive sediment management and planning in future, the present study investigated quantitative relationship between sediment storage in upstream dam reservoirs and downstream coastal erosion as the basis of future sediment management and planning. Firstly, we mapped sediment storage in 966 dam reservoirs in Japan, where we employed total sediment volume stored since their constructions. Secondly, we estimated volumetric coastal erosion of the 71 Japanese coastal zones between 1903 and 1991. Thirdly, we calculated total sediment storage in dam reservoirs located in the upstream area of a coastal zone for all the coastal zones. And finally, we plotted total sediment storage in upstream dam reservoirs and downstream coastal erosion to find positive and significant correlation between them.
Based on the result that upstream dam sediment storage certainly increase downstream coastal erosion, we then explored a simple methodology to estimate dam sediment storage in future based on the relationship between hourly precipitation intensity and hourly sediment inflow to dam reservoir estimated by water inflow to dam reservoir and its turbidity. We found remarkable correlation between precipitation intensity and sediment inflow; hence we expect that future sediment inflow to upstream dam reservoirs and downstream coastal erosion could be estimated if hourly precipitation, water inflow and its turbidity are continuously monitored in the watershed of dam reservoirs.