Estimation of long-term variation in nutrient loads from the Hii River by comparing the change in observed and calculated loads in the catchments

@article{Kamiya2008EstimationOL,
  title={Estimation of long-term variation in nutrient loads from the Hii River by comparing the change in observed and calculated loads in the catchments},
  author={Hiroshi Kamiya and Yoshihiro Kano and Koji Mishima and Katsuhiro Yoshioka and Osamu Mitamura and Yu Ishitobi},
  journal={Landscape and Ecological Engineering},
  year={2008},
  volume={4},
  pages={39-46}
}
To study the long-term change in nutrient loads from the Hii River to Lake Shinji, water samples were taken repeatedly over a year in 1983/1984 and again in 2001/2002. Annual total nitrogen (TN) loads, estimated from observations of water quality and river flow, increased from 860 to 920 t with a corresponding increase in NO3–N concentration during the cool season. In contrast, total phosphorus (TP) loads decreased from 96 to 62 t. Annual TN and TP loads, calculated using emission factors and… 

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