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学術研究成果リスト

Detail of Grant Awarded Academic Researches

Project

Effects of large-scale flooding on the subterranean insects, vegetation, and the particle size distribution of riverbed at the Tama river

Academic
Research
No.353
Principal
Investigator
Aki YANAGAWA
Affiliation Environmental Systems and Engineering, School of Science and Engineering, MEISEI University
Research
Summary

We evaluated the particle size distribution, the number of subterranean insects, and riverbed vegetation before and after the large-scale flooding at the Tama River due to Typhoon No. 19 in October 2019. Large-scale flooding caused by Typhoon No. 19 reduced the number of subterranean insects, and vegetation was washed away. Also, the particle size distribution of the riverbed was changed. In the upper basin, the survey points disappeared, and the riverbed area was reduced. In the middle basin, a gravel riverbed emerged.

On the other hand, there was almost no difference between the particle size distribution and the number of subterranean insects (Leiopsammodius japonicus) and riverbed vegetation before and after the flooding in the estuary. The gravel riverbed in the middle basin returned to the original state in one year. The coverage of invasive alien species increased in the middle basin. Carabidae, Staphylinidae, Tenebrionidae were observed at all study sites; those species were suggested as indicator species.


Collaborators

Kaoru WADA

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