Indonesian Journal of Geography (Jul 2013)

THE CHANGES IN STREAM WATER TEMPERATURE AND WATER QUALITY PARAMETERS DURING RAINFALL EVENTS IN FORESTED WATERSHEDS: SCALING OF OBSERVATIONS

  • Luki Subehi,
  • Takehiko Fukushima,
  • Yuichi Onda,
  • Shigeru Mizugald

DOI
https://doi.org/10.22146/indo.j.geog,2289
Journal volume & issue
Vol. 42, no. 2

Abstract

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We studied the changes in stream water temperature (Tw) and water quality (Wq) during rainfall events in forested watersheds. The parameters ofWq (88, DOC, N03--N, DTN, Na+, 8i and r) were observedinfour regionsof Japan from June 2004 to December 2005. The R values between Tw and those Wq parameters and between specific discharge (Qs) and Wq were positive, exceptfor the negativeones (Na+ and Si). Similarto the relationbetweenQs vs. Tw, hysteretic loops in the relations between Qs vs. those Wqparameters were clockwise, exceptfor Na+ and Si as counter-clockwiseloops. This indicatesthat the'surface and subsurface flows contain higher concentrations of SS, DOC, IC, N03--N and DTN. To the contrary,the deeperpathwayscontainhigherconcentrationsof Na+ and Si. These results suggest that the changes in Tw and Wq could be used to interpret theflow paths.