Water Purification of Runoff After Rainfall in a Natural Lagoon
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概要
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The water purification by a natural lagoon is examined by surveying the change of inflow and outflow loads of the lagoon accompanied with rain. Regarding the amount of inflow loads of nitrogen and phosphorus, the increase in particular type is conspicuous compared with dissolved type. This shows that the loads of non-point sources and sediments in rivers are flowing into the lagoon in large quantities. There is little increase of outflow loads. The loads, which flow into the lagoon, are stored and purified by the sedimentation accompanied by a decrease of the flow velocity. Hysteresis is shown in the amount of inflow loads. The direction of the amount of inflow loads at the time of the increase in flux is more than the time of a flux fall. Therefore, it is important to secure the storage capability at the time of the increase in flux in order to raise purification ability.
- 社団法人 農業農村工学会の論文
社団法人 農業農村工学会 | 論文
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