ため池の減少率を規定する土地利用変化 : 愛知県知多半島中部の事例 Variation in the Rate of Disappearance of Irrigation Ponds Based on Land Use : A Case Study in the Central Part of the Chita Peninsula, Aichi Prefecture

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都市近郊のため池密集地域である愛知県知多半島中部を事例にして,1998年から2002年の期間におけるため池の減少率を,それぞれのため池周辺に卓越する土地利用別に検討した.調査の結果,ため池は,圃場整備の行われていない農地や,農地に宅地が無秩序に進出しているような用途混在地に多く分布していた.そこでは受益面積のない貯水量の小さいため池が多くを占め,減少率が高かった.一方で,宅地や圃場整備の行われた農地ではため池の分布数は少なかった.そこに存在するため池は,受益面積が比較的保持され,貯水量が相対的に大きいという特徴を持ち,減少率は低かった.以上のことから,土地造成が行われていない地域において,利用価値の低下を理由として小規模なため池が放棄され消滅が進んでいること,宅地や農地のための土地造成が行われている地域においては,利用価値のある大規模なため池が選択的に残されていることが確認された.

There are several irrigation ponds in the city of Handa and the town of Agui, central areas on the Chita peninsula, Aichi Prefecture. Recently, those irrigation ponds have been decreasing in number. The cause and the manner in which these ponds had been disappearing were clarified by focusing on the spatial variation in the decrease rate based on land uses.<br> The study methods adopted were as follows: the study area was divided into 500-m grid cells and classified according to their dominated land use. The author also verified in the field all the irrigation ponds that were recorded in the "Irrigation Pond Ledger" (a survey carried out by Aichi Prefecture in 1998) of the study area. Further, the number of irrigation ponds was counted and the ponds that had disappeared in every grid cell were recorded. The disappearance rate of irrigation ponds for every land use category was calculated and these rates were compared.<br> Most of the irrigation ponds in this area existed on farmland on which land consolidation had not been undertaken or farmland consisting of many scattered artificial constructions. The irrigation ponds in these land use areas had low capacity, small irrigation area and a high disappearance rate. On the other hand, there were few irrigation ponds on residential land and farmland on which land consolidation had been undertaken. The irrigation ponds in these land use areas had relatively high capacity and large irrigation area, and their disappearance rate was low. The following conclusions can be drawn on the basis of these results:<br>1) In areas where land development had not been undertaken, the value of small-sized irrigation ponds decreased; hence, they were abandoned and they disappeared.<br>2) During the land development of residential land and new farmland, small irrigation ponds were destroyed. However, large irrigation ponds were left and maintained. On completion of the land development process, most of these large irrigation ponds were utilized for purposes other than the original ones.

収録刊行物

  • 地理学評論  

    地理学評論 79(6), 335-346, 2006-05-01 

    The Association of Japanese Geographers

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各種コード

  • NII論文ID(NAID)
    10018862887
  • NII書誌ID(NCID)
    AA11591990
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13479555
  • NDL 記事登録ID
    7950133
  • NDL 雑誌分類
    ZG1(歴史・地理)
  • NDL 請求記号
    Z8-571
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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