Nutrient transport and surface water-groundwater interactions in the tidal zone of the Yamato River, Japan

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

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

1 Citation (Scopus)

Abstract

This study examined nutrient transport dynamics and surface water-groundwater interactions in the tidal area of the Yamato River near Osaka, Japan. Spatial variation in radon (222Rn) and hydraulic gradient suggest that groundwater discharges to the river in the upstream reaches, but in the zone near the river mouth, river water recharges the groundwater. The deep groundwater depression is likely due to heavy groundwater extraction for use in Osaka up to 1970. Nitrate-nitrogen (NO3-N) levels were negatively correlated with dissolved organic nitrogen (DON). Based on mass balance calculations, nutrient production occurred in the tidal reach. Approximately 3% of dissolved total nitrogen (DTN) and 9% of dissolved total phosphorus (DTP) loads were attributed to upstream sources.

Original languageEnglish
Title of host publicationUnderstanding Freshwater Quality Problems in a Changing World - Proceedings of Symposium H04
PublisherIAHS Press
Pages204-211
Number of pages8
ISBN (Print)9781907161391
Publication statusPublished - Jan 1 2013
Externally publishedYes
Event2013 Symposium H04: Understanding Freshwater Quality Problems in a Changing World - Gothenburg, Sweden
Duration: Jul 22 2013Jul 26 2013

Publication series

NameIAHS-AISH Proceedings and Reports
Volume361
ISSN (Print)0144-7815

Other

Other2013 Symposium H04: Understanding Freshwater Quality Problems in a Changing World
CountrySweden
CityGothenburg
Period7/22/137/26/13

Keywords

  • Groundwater
  • Japan
  • Megacity
  • Nutrient
  • Tidal rivers
  • Yamato River

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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  • Cite this

    Onodera, S. I., Saito, M., Yoshikawa, M., Onishi, K., Shimizu, Y., & Ito, H. (2013). Nutrient transport and surface water-groundwater interactions in the tidal zone of the Yamato River, Japan. In Understanding Freshwater Quality Problems in a Changing World - Proceedings of Symposium H04 (pp. 204-211). (IAHS-AISH Proceedings and Reports; Vol. 361). IAHS Press.