Calculation of runoff pollution load from the upland field
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- SUKEKAWA Yu
- Dept. of Architecture and Civil Engineering, Graduate school of Engineering, Toyohashi University of Technology
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- YOKOTA Kuriko
- Dept. of Architecture and Civil Engineering, Toyohashi University of Technology
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- INOUE Takanobu
- Dept. of Architecture and Civil Engineering, Toyohashi University of Technology
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- OKUBO Yoko
- Dept. of Architecture and Civil Engineering, Toyohashi University of Technology
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- MATSUMOTO Yoshitaka
- Dept. of Architecture and Civil Engineering, Toyohashi University of Technology
Bibliographic Information
- Other Title
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- 降雨時調査による畑地群単独の栄養塩負荷量の算定
- コウウジ チョウサ ニ ヨル ハタチグン タンドク ノ エイヨウエン フカリョウ ノ サンテイ
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Abstract
The nutrient salt concentrations of inner bays or lakes are still not decreasing. The nutrient loads from non-point sources are large, however, the actual contribution of the loads to inner bays and lakes is not clarified. In this study the nutrients loads from the upland fields were evaluated by conducting river investigations and a specific load dose was calculated using the obtained data. 70% of annual precipitation has recorded between May and September and red tides were occurred in the Mikawa Bay in this term. Since the primitive unit of pollution load of upland fields established by the Ministry of Environment are based on the investigations in case of fine weather condition, TN and TP load ratios are 6.58kg/km2/day and 0.09kg/km2/day, respectively. The TN and TP load rations obtained using the data collected during rain events in this study were 2.94 and 1.0 in which the ratio of P was quite high.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 68 (7), III_769-III_773, 2012
Japan Society of Civil Engineers
