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Changing Patterns of Water Quality Associated with Hyporheic Flow of a Gravel Bar in the Kamo River

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Title: Changing Patterns of Water Quality Associated with Hyporheic Flow of a Gravel Bar in the Kamo River
Other Titles: 賀茂川中流域における砂州間隙水の動態と水質変化機構
Authors: Yamada, Hiroyuki1 Browse this author →KAKEN DB
Tanaka, Takeshi2 Browse this author
Takemon, Yasuhiro3 Browse this author
Ikebuchi, Shuichi4 Browse this author
Authors(alt): 山田, 浩之1
田中, 武志2
竹門, 康弘3
池淵, 周一4
Keywords: dissolved oxygen
hyporheic zone
physicochemical environment
Issue Date: Mar-2004
Publisher: 京都大学防災研究所
Journal Title: 京都大学防災研究所年報
Journal Title(alt): Annuals of Disaster Prevention Research Institute, Kyoto University
Volume: 47
Issue: C
Start Page: 263
End Page: 272
Abstract: Synopsis: Aquatic environmental conditions of the hyporheic zone in a gravel bar were investigated under normal low-flow conditions in the Kamo River, in Kyoto city, Japan. Horizontal distribution and chronological changes in DO concentration, water temperature and electric conductivity in the hyporheic zone were examined in relation to the hyporheic flow as a factor for the changes in water quality. Distribution patterns of the water quality parameters showed that the reduction in DO concentration was strongly related to the hyporheic water temperature, indicating that it was influenced by decomposition process of organic matters as well as the liquidity of the hyporheic flow. Hyporheic water temperature at the area without vegetation cover tended to rise following the increase in the ground surface temperature in the daytime.
はじめに: 河床内部の斜面由来の地下水と河川水が混ざり合う場所は河床間隙水域と呼ばれ,河川生態系における物質の滞留や分解の場,水生昆虫などの生息場となるなど,その様々な生態学的機能が注目を集めている.また,砂州の間隙水域には,河川水が濾過されることによる水質浄化作用にも社会的な期待が寄せられている.こうした間隙水域の機能については,降雨・増水イベントと関連付けて,河川の水質形成に及ぼす影響を調べた事例は多いが,間隙生物の生息場機能に着目した研究は少ない.一般に,増水時には,間隙水域の流量が増大し,多くの間隙生物の生存に不可欠な溶存酸素が供給されると考えられる.いっぽう,河床の攪乱が起こらず平水状態が続くと,河川水が浸入しにくくなり間隙水域の環境が悪化すると考えられる.そこで,本研究では,平水時の砂州間隙水域の水質環境のうち,とくに溶存酸素の分布様式や時系列変化に着目し,それらに影響を及ぼす要因について,間隙水の動態と関連付けて検討した.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山田 浩之

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