降雨時における集団茶園流域の河川水質と流出負荷特性

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In this study, we discuss the storm runoff load for a collective tea field catchment. The study area was Makinohara plateau, in Shizuoka, Japan. The water quality and discharge were measured during a storm period. Heavy rain occurred due to a Bai-u front or cyclone during the rainy and typhoon seasons from June to September. Compared with clear weather days, NO3-N concentration during heavy rain decreased to 1/3. However the T-P and COD concentrations increased 2∼23 times. The average recovery rate of NO3-N concentration was 3 mg · l-1 · d-1. Hysteresis was observed in the relation between the discharge and the loads. The loads NO3-N becomes higher when discharge was decreased than when it was increased. On the other hand, the load of T-P showed a reverse tendency, and the load of COD was similar, too. The loads in periods of storm runoff are heavily affected by the amount of rainfall and antecedent conditions.
社団法人　日本水環境学会の論文
2006-07-10