| Item type |
紀要論文 / Departmental Bulletin Paper_03(1) |
| 公開日 |
2025-12-26 |
| タイトル |
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タイトル |
平成23年（2011年）東北地方太平洋沖地震による津波被災農地の堆積物・土壌の理化学的特徴 |
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言語 |
ja |
| タイトル |
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タイトル |
The Physicochemical Properties of Tsunami Deposits and Agricultural Soils in Devastated Farmlands by the 2011 off the Pacific coast of Tohoku Earthquake |
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言語 |
en |
| 言語 |
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|
言語 |
jpn |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
article |
| ID登録 |
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|
ID登録 |
10.24514/0002001441 |
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ID登録タイプ |
JaLC |
| 著者 |
北川, 巌
友正, 達美
原口, 暢朗
塩野, 隆弘
若杉, 晃介
芦田, 敏文
瑞慶村, 知佳
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
This report presents a comprehensive assessment of the physicochemical effects on agricultural soils of sludge and sea sand deposition and seawater influx as a result of the tsunami caused by the 2011 off the Pacific coast of Tohoku Earthquake. These effects have been evaluated in terms of general physicochemical properties, as well as salt, heavy metal, and sulfi de content. The following basic knowledge has been acquired for managing agricultural land restoration. (1) Tsunami deposits contained large quantities of chloride, sulfate, sodium, and magnesium, which were derived from seawater. The deposits also had high EC. In particular, these components were abundant in fine sludge particles and in first 10 cm of topsoil, but were less abundant in lower soil layers. (2) In the 94 days following the disaster, salt permeated downward in some tsunami-affected agricultural land, meaning that the salt content was reduced in deposits and surface soil to an extent. However, in agricultural land where the salt did not permeate downward, these components remained abundant in deposits and topsoil. The situation differed greatly depending on the drainage and soil conditions of the agricultural land. (3) Because the copper, zinc, and cadmium content in deposits and topsoil were not especially high, risk reduction measures can be implemented for agricultural land restoration and farming activities. (4) The tsunami deposits included sulfi de-containing acid sulfate soils; to prevent agricultural production from being impaired due to strong acidification, it is essential to coordinate countermeasures with other recovery activities according to the thickness of the deposits, their sulfur content, and the state of the agricultural land. (5) Immediately after the disaster, high pH (H2O2) due to bases such as sodium was recorded via methods for rapidly evaluating acid sulfate soils in tsunami deposits. As a result, pH could not be appropriately evaluated in cases where the sulfur content was relatively low. Accordingly, additional evaluations were necessary that used filtrates to measure sulfur concentration. (6) The physicochemical properties of soils indicate the possibility of using pyroclastic flow deposits found in hilly areas around the disaster area as supplementary soil in order to deal with soil shortfalls caused by agricultural soil being washed away by the tsunami and by contaminated soil needing to be removed. Additional soil is also needed for land leveling as a subsidence countermeasure. |
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言語 |
en |
| 書誌情報 |
ja : 農村工学研究所技報
en : Technical report of the National Institute for Rural Engineering
巻 213,
p. 39-51,
発行日 2012-05-31
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| 出版者 |
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出版者 |
独立行政法人農業食品産業技術総合研究機構農村工学研究所 |
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言語 |
ja |
| 出版者 |
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|
出版者 |
National Agriculture and Food Research Organization, National Institute for Rural Engineering |
|
言語 |
en |
| ISSN |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
1882-3289 |
TRNIREJ213_39-51.pdf (661 KB)
