, Volume 11, Issue 2, pp 115–124 | Cite as

Analysis of stream water temperature changes during rainfall events in forested watersheds

  • Luki Subehi
  • Takehiko Fukushima
  • Yuichi Onda
  • Shigeru Mizugaki
  • Takashi Gomi
  • Ken’ichirou Kosugi
  • Shinya Hiramatsu
  • Hikaru Kitahara
  • Koichiro Kuraji
  • Tomomi Terajima
Research paper


Despite continued interest in stream water temperature (Tw) analysis, there are few studies of Tw response to rainfall events at forested watersheds. We examined 61 sets of data on Tw for 21 rainfall events at 16 watersheds with various slope gradients (from 0.08 to 0.56) in four regions of Japan from June 2004 to December 2005. The investigation focused on the changes of specific discharge (ΔQs) and ΔTw at medium-sized watersheds (0.5–100 ha). The results clearly demonstrated different flow patterns expressed by Qs vs. Tw hysteretic loops. Those were clockwise in Period I (April–September) and counterclockwise in Period II (October–March), except for lower slope gradient at Aichi, where counterclockwise loops were observed in both periods. These differences in hysteretic loops could be explained by the differences in Tw and in response times to rainfall between surface/subsurface and groundwater flows. The response times were probably determined by the slope gradient and the vertical level of groundwater. We also found that the changes in air temperature (ΔTa) influenced ΔTw to a lesser degree than Qs. The average rainfall intensities in Period I and Period II (9.3 ± 1.7 and 5.4 ± 0.2 mm/h, respectively) affected the average values of ΔQs and ΔTw (6.62 ± 4.08 mm/h and 1.7 ± 0.4°C; 0.85 ± 0.68 mm/h and 0.9 ± 0.3°C, respectively). This indicates that slope gradient and Qs influenced ΔTw by changing the relative proportions of flow paths. In addition, the water table changes influenced the percentage of groundwater flow to the stream.


Stream water temperature changes Specific discharge Hysteretic loop Rainfall event Slope gradient 



This research was supported by Japan Science and Technology Agency, Core Research for Evolutional Science and Technology. We express our thanks to all members involved in this project.


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Copyright information

© The Japanese Society of Limnology 2009

Authors and Affiliations

  • Luki Subehi
    • 1
  • Takehiko Fukushima
    • 1
  • Yuichi Onda
    • 1
  • Shigeru Mizugaki
    • 2
  • Takashi Gomi
    • 3
  • Ken’ichirou Kosugi
    • 4
  • Shinya Hiramatsu
    • 5
  • Hikaru Kitahara
    • 5
  • Koichiro Kuraji
    • 6
  • Tomomi Terajima
    • 7
  1. 1.Graduate School of Life and Environmental SciencesUniversity of TsukubaTsukubaJapan
  2. 2.Watershed Environmental Engineering Research Team, Civil Engineering Research Institute for Cold RegionPublic Work Research InstituteSapporoJapan
  3. 3.Graduate School of AgricultureTokyo University of Agriculture and TechnologyTokyoJapan
  4. 4.Graduate School of AgricultureKyoto UniversityKyotoJapan
  5. 5.Faculty of AgricultureShinshu UniversityNaganoJapan
  6. 6.Graduate School of Agricultural and Life SciencesUniversity of TokyoAichiJapan
  7. 7.Disaster Prevention Research InstituteKyoto UniversityKyotoJapan

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