Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering
Online ISSN : 1884-7242
Print ISSN : 1882-2789
ISSN-L : 1882-2789
Technical Papers
Temporal Change in Particle Size Distributions of Suspended Solids Discharged from Paddy Fields
Yoshiaki SUNAGAHiroyuki MATSUIKazutoshi OSAWA
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2017 Volume 85 Issue 2 Pages II_113-II_119

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Abstract

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.

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© 2017 The Japanese Society of Irrigation, Drainage and Rural Engineering
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