循環灌漑による濁水負荷削減効果 [in Japanese] Reduction of Murky Water Load by Cyclic Irrigation [in Japanese]
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本研究は, 琵琶湖沿岸に広がる低平地水田流域に実施された循環灌漑による濁水負荷の流出削減効果を評価した.結果として, 代かき期の削減効果が大きいことが示された.代かき期の循環灌漑では, 従来の逆水灌漑に比べ, 最大で152 kgha<SUP>-1</SUP> (2004年), 415 kgha<SUP>-1</SUP> (2005年) の濁水負荷の流出が削減されていたものと推定された.このとき, 濁質の水田への還元量は, それぞれ37kg ha<SUP>-1</SUP>および204kg ha<SUP>-1</SUP>であった.一方で, 削減効果は気象条件や施設管理に大きく左右されることが示唆された.
In this study, cyclic irrigation as reduction measure for murky water load was investigated in low-lying paddy field district around Lake Biwa. As a result, it was shown that the irrigation system could reduce effectively the murky water load during the puddling season. Comparing with conventional irrigation system, in which irrigation water is derived from the Lake Biwa by pumping, the cyclic irrigation system during the puddling season could reduce the potentially efflux load of up to 152 kg ha <SUP>-1</SUP> in 2004 and 415 kg ha<SUP>-1</SUP>lin 2005, respectively. And then, total load returned to the paddy by the irrigation was 37 kg ha<SUP>-1</SUP> and 204 kg ha<SUP>-1</SUP>, respectively. On the other hand, it was suggested that the weather condition and the management practices of the irrigation facilities had large influences on the reduction effect.
- Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering
Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 74(5), 721-727, 2006-10-25
The Japanese Society of Irrigation, Drainage and Rural Engineering