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Title: 児島湖底土の飽和透水係数に及ぼす土壌溶液pHの影響
Other Titles: Effect of pH on Saturated Hydraulic Conductivity of Lake Kojima Sediment
Authors: 石黒, 宗秀1 Browse this author →KAKEN DB
岩元, 亮一2 Browse this author
石田, 智之3 Browse this author
赤江, 剛夫4 Browse this author
Authors(alt): ISHIGURO, Munehide1
IWAMOTO, Ryouichi2
ISHIDA, Tomoyuki3
AKAE, Takeo4
Keywords: 底泥
saturated hydraulic conductivity
dispersion flocculation
Issue Date: Dec-2001
Publisher: 農業農村工学会
Journal Title: 農業土木学会論文集
Journal Title(alt): Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering
Volume: 2001
Issue: 216
Start Page: 65(771)
End Page: 70(776), a2
Publisher DOI: 10.11408/jsidre1965.2001.771
Abstract: 栄養塩類の供給源となる湖沼底土は, 湖沼過栄養化の一因となるため, その処理対策が検討されている. 底土を利用するためには, その利用目的に合った透水性が要求される. 一方, 土壌の透水性は, 種々の粘土鉱物や有機物の影響を受けるため, 未解明の部分が多い. 本研究では, 非膨潤性の層状粘土鉱物を含む児島湖底土を用いて, その飽和透水係数を測定し, 飽和透水特性を実験的に明らかにした. Caを吸着した土壌試料では, 浸透溶液濃度が低下しても透水係数は小さな低下に留まった. 特に, pH11のCa吸着試料では, 最も小さな変化であった. これは, 土粒子とCaの化学反応により構造が安定化したためと考えられる. 一方, Naを吸着した試料では, pH5では透水係数は小さな低下であったが, pHが上昇するに従い著しい低下を示した. この結果は, 粘土鉱物の荷電特性と拡散二重層理論により説明できた.
As lake sediments are one of the cause of eutrophication, their effective use has been considered. When they are used as soil in a land, proper permeability is required. However, soil permeability has not completely been understood due to diversity of clays and organic compounds. We clarified permeability characteristics of Lake Kojima sediment, non-swelling clayey soil, by measuring saturated hydraulic conductivity (K). Decrease in K with percolation of dilute electrolyte solution was small when Ca was adsorbed by the soil. Particularly, decrease in K at pH11 was the smallest, because soil structure became stable with chemical reaction between soil particles and Ca. On the other hand, when Na was adsorbed, decrease in K was the smallest at pH5, and it became larger as soil pH increased. The obtained results could be explained qualitatively by the diffuse double layer theory.
Rights: © 社団法人 農業農村工学会
© The Japanese Society of Irrigation, Drainage and Rural Engineering
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: 石黒 宗秀

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