水田排水に含まれる懸濁物質の粒度分布の経時変化に関する考察  [in Japanese] Temporal Change in Particle Size Distributions of Suspended Solids Discharged from Paddy Fields  [in Japanese]

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Abstract

宇都宮市の2地区の水田において, 灌漑期を通した用排水の水質調査を実施し, 懸濁物質およびその粒度分布の経時変化に関して, 次のことを明らかにした.用水に含まれる懸濁物質の粒度分布は灌漑期を通してあまり変化しない.その一方, 排水に含まれる懸濁物質の粒度分布は時間の経過とともに粒径の大きい側に遷移する傾向がある.代かきや田植えによる土壌攪乱により懸濁物質濃度が上昇するときには多くの細粒分が流出している.また, 無降雨時に用水中に含まれない細粒画分の懸濁物質が排出されている.さらに, 代かき田植え期とそれ以降の時期では濁水中に含まれる懸濁物質の粒度分布が異なるため, 同一の濁度-懸濁物質濃度式の適用は大きな推定誤差を生じさせる可能性が高い.

We investigated the temporal change in particle size distributions of suspended solids (SS) in the irrigation water and the drainage water at paddy fields located in Utsunomiya. We clarified the followings. First, the particle size distributions of SS in the drainage water tended to be coarse as the time proceeded from the paddling and transplanting period, while the particle size distributions of SS in the irrigation water tended not to change. Second, large amounts of fine fraction were discharged from paddy fields when turbid water containing a high concentration of SS was discharged during the paddling and transplanting period. Third, fine fraction tended to become suspended in paddy fields and be discharged from paddy fields under no rain condition. Finally, an proper turbidity - SS concentration calibration line is desired for the paddling and transplanting period and the other period, since particle size distributions of SS in these periods are different.

Journal

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

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 85(2), II_113-II_119, 2017

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130006246969
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • NDL Article ID
    028799655
  • NDL Call No.
    Z18-365
  • Data Source
    NDL  J-STAGE 
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