Strategic study on ecohydraulic properties of overgrown vegetation on floodplain aiming at sustainable river management

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In order to investigate ecohydraulic properties of overgrown vegetation on floodplain, field studies and flood flow analysis were performed in three test reaches of vegetated river channel. The test reaches were chosen so that effects of river restoration and artificial discharge control on vegetation overgrowth were individually evaluated. In addition to the probe measurements of flood flow and vegetation behaviors, aerial photographic surveying was carried out by using a radio control mini-helicopter (falcon-PARS). Decades-long vegetation dynamics were successfully analyzed by hydrodynamic and ecological models, which were verified through comparison with the field data collected after several flood events. It was found how river restoration and discharge control affect ecohydrodynamics of vegetated river reach. The result is to provide a guideline for a sustainable river management strategy with minimum labor and cost.