メコンデルタ洪水常襲稲作地域におけるフルダイク化の進展とその影響  [in Japanese] Expansion of Full-dyke System and Its Impact in Flood-prone Rice Area in the Mekong Delta  [in Japanese]

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Abstract

メコンデルタの洪水常襲稲作地域であるベトナム国アンジャン省を対象に,稲3期作化のためのフルダイク(輪中堤防)の進展による水文環境への影響を調べた.対象地域のフルダイク地区(農地内への洪水流入を完全に防ぐ地区)とセミダイク地区(夏秋作収穫後に洪水が農地内に越流する地区)について,住民や行政機関から聞き取り調査を行い,フルダイク化進展前と進展後における衛星画像とメコン河(ハウ川,ティエン川)の水位変化からフルダイク化が周辺の水文環境に与えた影響を分析し,以下の知見を得た.1)フルダイク内農地の土壌肥沃度の低下,病虫害の多発,水路水質の悪化が生じている,2)アンジャン省の南側下流地点カントーの水位が近年上昇傾向にある,3)アンジャン省西側のキエンジャン省や北側のカンボジアではフルダイクの影響とみられる洪水の長期化傾向が認められる.

The Mekong Delta is considered one of the mega-delta that faces great risk by climate change. This paper investigated the impact on hydrological environment caused by full-dyke system that is developed for triple rice cropping in flood prone area in the Mekong Delta in Vietnam. The effects, issues and impact of full-dyke system to surrounding hydrological environment were analyzed based on the survey to the farmers, satellite imagery and water level of the main-distributaries of Mekong River. An Giang Province, adjacent to Cambodian border, was selected from flood-prone rice area in the Mekong Delta. The following changes have been clarified due to the expansion of full-dyke systems 1) Soil fertility has been decreased due to less sediment supply from flood, increasing occurrence of disease and pest due to year-round rice culture by triple cropping and deterioration of water quality of the canal, 2) Water level at Can Tho station of Hau River which is south-downstream of An Giang Province tends to rising in recent years, 3) The prolonged trend of the flood duration was observed in Cambodia which is upstream of An Giang and in Kien Gian Province which is west-downstream of An Giang.

Journal

  • Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 81(3), 271-278, 2013

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130004951463
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • NDL Article ID
    024740656
  • NDL Call No.
    Z18-365
  • Data Source
    NDL  J-STAGE 
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