Prediction and Preservation Models for Nitrogen Concentration in Irrigation Pond.

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  • 農業用ため池の潅がい期の窒素濃度予測モデルと水質保全対策の効果評価
  • 農業用ため池の灌漑期の窒素濃度予測モデルと水質保全対策の効果評価
  • ノウギョウヨウ タメイケ ノ カンガイキ ノ チッソ ノウド ヨソク モデル ト スイシツ ホゼン タイサク ノ コウカ ヒョウカ

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Abstract

In this paper, Vollenweider model was studied by using water quality data during irrigation periods in irrigation ponds. At first, it was clarified that Vollenweider model could predict the average T-N concentration during an irrigation period within 1.0 mg·l-1 of error to the observed, where inflow N loads from the basin were estimated by using the product of applied N fertilizer by the effluent rate revised with water inflow rate for upland field and orchard, the regression equation of effluent N load to the input load for forest, the product of the annual average N concentration by the amount of precipitation for the other non-point sources, and basic units for point sources. Secondary, a guideline for water quality improvement was conducted in accordance with Vollenweider model equation in respect of the reduction of inflow N loads and of the dilution with cleanly water. The effects of such measures depend on the α factor which is defined as α=νV/zQ, where ν is the apparent settling velocity of nitrogen (5.0 m per irrigation period); V is the irrigation pond capacity (m3); z is the mean depth of the irrigation pond(m); Q is the water inflow rate before the measure (m3 per irrigation period).

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