@article{Masanobu Taniguchi_Hiroyuki Ii_2017, title={DISTRIBUTION CHARACTERISTICS OF THE ANNUAL NITROGEN LOAD IN YAMATO RIVER BASIN IN 2011}, volume={10}, url={https://geomatejournal.com/geomate/article/view/2000}, abstractNote={<p>Although there was not enough data to calculate the amount of nitrogen load in the Yamato<br>River basin, some estimation methods were applied for calculation. The estimation of flow rate was made<br>using a calculation of the cross section and velocity using a new method to estimate velocity from cross<br>section and water level values based upon the modified Manning equation. The estimation of total nitrogen<br>concentration was calculated using EC and water level values or flow rate. As a result, the annual total<br>nitrogen load at Kashiwara, Fujii, Itahigashi, Hota, Shintatsuta, Nukatabetakabashi, and Kamihanda stations<br>and the Nara sewage treatment plant were estimated to be 1856, 1793, 751, 498, 260, 188, 83 and 481t/year<br>in 2011. The amounts of total nitrogen load from two sewage treatment plants reached 900t/year, about 45%<br>of those at the Yamato River basin. The annual total nitrogen load at Kashiwara Station under flood<br>conditions with over 24m3<br>/sec of flow rate and excluding flood conditions were calculated to be 835 and<br>1021t/year in 2011. The annual total nitrogen load at Fujii Station was calculated to be 1013t/year under<br>flood conditions with over 22m<br>3<br>/sec of flow rate and excluding flood conditions to be 780t/year in 2011.<br><br></p>}, number={22}, journal={GEOMATE Journal}, author={Masanobu Taniguchi and Hiroyuki Ii}, year={2017}, month={Feb.}, pages={2043–2049} }