EFFECT OF FLUSH DISCHARGE ON RIVER ENVIRONMENT IN THE DOWNSTREAM OF HAJI DAM

• GOTO Masuji

  山口大学大学院 創成科学研究科

• AKAMATSU Yoshihisa

  山口大学大学院 創成科学研究科

• INUI Ryutei

  山口大学大学院 創成科学研究科

• EBINO Hidenori

  山口大学工学部社会建設工学科

• KONO Takanori

  山口大学大学院創成科学研究科

• YAMAGUCHI Kohei

  山口大学工学部社会建設工学科

• KAMIYA Daisuke

  琉球大学 工学部環境建設工学科

Bibliographic Information

Other Title

• 土師ダムにおけるフラッシュ放流による河床環境改善効果の検討

Abstract

 An artificial flush flood have been conducting in the daownstream reach of Haji dam to improve the rivebed environment. In this area, the overgrowth of Egeria densa gives a negative impact on the river ecosystem. We investigated the change of the area covered by Egeria densa, the attached algae biomass and the benthic invertebrate biomass bofore and after the artificial flush flood.<br> The result indicated that the attached algae and the cover degree of Egeria densa decreased, on the ontrary the biomass of the benthic invertebrate almost never changed. However, the detachment of Egeria densa occurred only in the center of stream with high bed shear stress duing the peak of artificial flood. This result indicates that the group of Egeria densa will expand the inhabitable area from the bank to the center of river again.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74 (4), I_589-I_594, 2018

  Japan Society of Civil Engineers

Keywords

• Flush discharge
• Damdown stream river environment
• aquatic insect
• E-densa

Details

• CRID: 1390845713073396864
• NII Article ID: 130007628323
• DOI: 10.2208/jscejhe.74.i_589
• ISSN: 2185467X
• Web Site: https://www.jstage.jst.go.jp/article/jscejhe/74/4/74_I_589/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed