カザフスタン・イリ川下流域灌漑地区における地下水位変動特性とその要因に関する研究  [in Japanese] Study on Characteristics of Groundwater Level Fluctuation and Its Factors in an Irrigated District in the Lower Ili River Basin, Kazakhstan  [in Japanese]

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Abstract

イリ川下流域の灌漑地区では,水稲作と畑作の輪作が行われ,畑作物は生育初期を除き畑作圃場周囲の水路・水稲作圃場からの浸透により上昇した地下水を利用し生育する.一方で,過剰な地下水位の上昇は塩類集積の原因となるため,適切な地下水位管理が求められ,適切な管理に向けて地下水位変動の時間・空間的な特性を把握することが重要である.<br>そこで本稿では地下水位変動特性の時空間分析を行い以下の知見を得た.1)水稲作が本格的に導入された70年代より地下水位は急激に上昇し,取水量が最大であった80年代にピークを迎え,取水量の減少とともに現在低下傾向を示している,2)非灌漑期では地下水位の空間分布は地表面にほぼ平行であるが,灌漑期での地下水位上昇の空間分布は一様ではない,3)ある地点の地下水位変動は,周辺の農地利用や排水路の整備状況により影響を受けることが示唆された.

In the irrigation district in the lower Ili River basin, a crop rotation system which combines paddy rice and field crops is practiced. Upland crops use the groundwater which is raised by seepages from canals and rice cropped fields. However, excessive rising of groundwater level on upland cropped fields causes salinization. Therefore, it is necessary to control groundwater level appropriately and to perceive temporal and spatial characteristics of groundwater level fluctuation is quite important for adequate groundwater level control.<br>This study analyzed temporal and spatial distribution of groundwater level fluctuation. The results are summarized as follows; (1) Groundwater level had risen sharply since 1970s when cultivation of paddy rice was officially introduced and was highest in 1980s when amount of irrigation water supply peaked. Recently, groundwater level showed the decreasing trend with decrease of amount of irrigation water supply. (2) Spatial distribution of groundwater level inclined with ground surface inclination during non-irrigation period while spatial distribution of the raised groundwater level was not uniform during irrigation period. (3) Agricultural land use and condition of drainage canals affected groundwater level fluctuation.

Journal

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

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 81(1), 51-56, 2013-02-25

    The Japanese Society of Irrigation, Drainage and Rural Engineering

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Codes

  • NII Article ID (NAID)
    10031171473
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    18822789
  • NDL Article ID
    024317520
  • NDL Call No.
    Z18-365
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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