Ecological evaluation of reach scale channel configuration based on habitat structures for river management

Ecological evaluation of riverbed geomorphology is essential for environmental assessment of river works as well as for establishment of target images in river management planning. In this paper, we analyzed inter-relationships between the reach-scale channel configuration (RSCC) and habitat structu...

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Bibliographic Details
Published in:Journal of hydroinformatics 2018-05, Vol.20 (3), p.622-632
Main Authors: Choi, Mikyoung, Takemon, Yasuhiro, Yu, Wansik, Jung, Kwansue
Format: Article
Language:English
Subjects:
Aerial photographs
Aerial photography
Aquatic habitats
Bifurcations
Biodiversity
Braiding
Channels
Configurations
Deformation
Diversity indices
Ecological evaluation
Ecological monitoring
Environmental assessment
Environmental Impact Assessment
Fish
Geomorphology
Habitats
Management planning
Ponds
River beds
Riverbeds
Rivers
Target recognition
Terraces
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Summary:Ecological evaluation of riverbed geomorphology is essential for environmental assessment of river works as well as for establishment of target images in river management planning. In this paper, we analyzed inter-relationships between the reach-scale channel configuration (RSCC) and habitat structure on the riverbed based on the historical changes of riverbed geomorphology on the Kizu River in Japan. The analyses used nine sets of aerial photographs taken from 1948 to 2012, which resulted in a total of eight RSCC types classified as Single Sinuous, Semi-Wandering-Straight, S-W-Sinuous, Wandering-Straight, W-Sinuous, Bifurcated-Straight, B-Sinuous, and Braided Sinuous. Aquatic habitats were classified into four lotic habitats (Main Slow, Secondary Slow, Gently Bending Riffle, and Sharply Bending Riffle) and four lentic habitats (Bar-Head Wando, Bar-Tail Wando, Active Pond, and Terrace Pond), and their richness and diversity indices were analyzed in relation to RSCC types. The results showed that Braided Sinuous channels had the maximum number of habitats, and Wandering-Straight and Bifurcated-Sinuous channels showed higher habitat diversity than the others. These results indicated that the target image of the Kizu River management will be Braided-Sinuous channels in terms of habitat abundance, whereas they will be Wandering-Straight and Bifurcated-Sinuous channels from the aspect of habitat diversity.
ISSN:1464-7141
1465-1734
DOI:10.2166/hydro.2018.139