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

https://doi.org/10.22146/ijg.2289

Luki Subehi(1*), Takehiko Fukushima(2), Yuichi Onda(3), Shigeru Mizugald(4)

(1) 
(2) 
(3) 
(4) 
(*) Corresponding Author

Abstract


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.

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DOI: https://doi.org/10.22146/ijg.2289

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Accredited Journal, Based on Decree of the Minister of Research, Technology and Higher Education, Republic of Indonesia Number 30/E/KPT/2018, Vol 50 No 1 the Year 2018 - Vol 54 No 2 the Year 2022

ISSN 2354-9114 (online), ISSN 0024-9521 (print)

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