The effect of small impoundments on nutrient transport in a suburban watershed

Yuta Shimizu, Shin Ichi Onodera, Koki Onishi, Mitsuyo Saito, Masashi Yoshikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


The objective of this study was to confirm the effect of small impoundments on nutrient transport on a catchment scale. We examined the effect using the ratio that dissolved nitrogen (DN) is divided by CI". The ratio increased in the summer season and decreased in the winter season at the outlet of the impoundments. The reason for decreasing of the ratio may be explained by the decline of DN concentration, by assimilation or denitrification. The relation between residence time and magnitude of nitrate removal showed that long residence time can lead to greater reduction of nitrate. However, DN was produced in larger impoundments and sediment interaction may occur as a result. Therefore, smaller impoundments may be more effective for nitrate attenuation than larger ones. From the results, small impoundments management is important for better water environments in a watershed in future, because it has a potential for nutrient removal that can be used more positively for improving water quality at a local scale.

Original languageEnglish
Title of host publicationConsidering Hydrological Change in Reservoir Planning and Management - Proceedings of H09, IAHS-IAPSO-IASPEI Assembly
PublisherIAHS Press
Number of pages6
ISBN (Print)9781907161407
Publication statusPublished - Jan 1 2013
Externally publishedYes
Event2013 H09, IAHS-IAPSO-IASPEI Assembly - Gothenburg, Sweden
Duration: Jul 22 2013Jul 26 2013

Publication series

NameIAHS-AISH Proceedings and Reports
ISSN (Print)0144-7815


Other2013 H09, IAHS-IAPSO-IASPEI Assembly


  • Nitrogen removal
  • Residence time
  • Small impoundment

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)


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