津波被害を受けた農地の実態と対策について

DOI Web Site 被引用文献1件 参考文献33件

書誌事項

タイトル別名
  • Farmlands Damaged by Huge Tsunami and Countermeasures
  • ツナミ ヒガイ オ ウケタ ノウチ ノ ジッタイ ト タイサク ニ ツイテ

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説明

A strong earthquake hit eastern Japan on March 11th, 2011 and it lasted for 6 minutes. It triggered huge tsunami and the tsunami damaged not only houses and residents but also farmlands. There are several types of interactions between the tsunami and the farmlands. If there was a muddy (sometimes contains sulfidic materials) and/or sandy deposit under the shallow seawater or in the nearshore zone, it was transported inland. Pyrite was found in the sulfur-rich muddy deposits. There are narrowly eroded places along a road and a ridge where tsunami fell down from these micro-high sites. Moreover, the plow layer soil was lost at least partly. Thus, the deposits on the farmlands are the mixtures of the eroded plow layer soil and transported materials from the nearshore zone. The chemical interactions include the exchange reaction between Na+ in seawater and exchangeable cations in the plow layer soil, and precipitation of gypsum (CaSO4 .2H2O) as well as halite (NaCl) when the soils dry. Debris of various materials and halite, at least, must be removed to restore the damaged farmlands.

収録刊行物

  • 混相流

    混相流 26 (2), 143-149, 2012

    日本混相流学会

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