Seasonal comparison of predominant factors in river temperature formation in an Urban River

Junichi Nishimata, Hitoshi Miyamoto

Research output: Contribution to conferencePaperpeer-review

Abstract

In this paper, predominant factors of river temperature formation in each season were analyzed by using the field observation and heat budget analysis in the middle and lower parts of an urban river. The urban river analyzed was the first-class river, Tama River, flowing through the Tokyo metropolitan area. Treated water with a constant temperature flowed into the Tama River from several water reclamation centers located along with Tama River. Observational data analyses indicated that the influence of convective heat flux from the treated water discharge greatly affected the formation of river temperatures in the middle reach of Tama River in all seasons. On the other hand, in the lower reach, the river temperature flowed downstream with a nearly constant temperature. The heat budget analysis also showed that, in summer and autumn, the river temperature in the middle reach was more influenced by the treated water than that in the downstream reach. Other predominant factors in river temperature formation in each season were further discussed and compared by using the heat budget analysis.

Original languageEnglish
Publication statusPublished - 2020
Externally publishedYes
Event22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020 - Sapporo, Virtual, Japan
Duration: 2020 Sep 142020 Sep 17

Conference

Conference22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division: Creating Resilience to Water-Related Challenges, IAHR-APD 2020
Country/TerritoryJapan
CitySapporo, Virtual
Period20/9/1420/9/17

Keywords

  • Stream temperature
  • Thermal energy equation
  • Treated wastewater
  • Urban river
  • Water quality

ASJC Scopus subject areas

  • Ecology
  • Environmental Engineering

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