INFLUENCE OF SPATIOTEMPORAL PATTERNS OF EROSION AND DEPOSITION PROCESSES DURING FLOODS ON RIVERINE HABITAT SUITABILITY

DOI Web Site 4 References
  • HYODO Makoto
    Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
  • TAKEMON Yasuhiro
    Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
  • SUMI Tetsuya
    Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
  • AWAZU Yosuke
    Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
  • DENG Zhaohui
    IDEA Consultants, Inc., Japan

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Other Title
  • 洪水時の地形の浸食堆積履歴が河川生息場の好適性に及ぼす影響
  • コウズイジ ノ チケイ ノ シンショク タイセキ リレキ ガ カセン セイソクジョウ ノ コウテキセイ ニ オヨボス エイキョウ

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Abstract

This article shows how spatiotemporal patterns of geomorphological processes influence riverine habitat suitability. We conducted a case study in a middle reach of the Tenryu River in Japan and a set of interval-recording-cameras has been installed at 60m above the riverbed on the electric supply tower located in the middle of a river corridor. Firstly, we identified different types of habitat structures in a reach, such as riffles, side pools, and back waters, and analyzed characteristics of inundation processes for each habitat type. Secondly, we analyzed, at a micro scale, hardening and softening processes of habitat structures by small floods in relation to lotic and lentic inundation characteristics. Thirdly, in order to analyze erosion and deposition processes at a macro scale, we developed a 2-D model using the photogrammetric method and analyzed temporal series of the aerial photo data and 2-D-transformed data by quantifying deposited and eroded areas due to different types of floods.

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