1991 Fiscal Year Final Research Report Summary
Hydrogeochemical studies on stream water in a forested watershed
| Project/Area Number |
02660159
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | Kyoto University |
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Principal Investigator |
SUZUKI Masakazu Kyoto Univ. Fac. of Agric. Instructor, 農学部, 助手 (10144346)
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| Co-Investigator(Kenkyū-buntansha) |
OHTE Nobuhito Kyoto Univ. Fac. of Agric. Instructor, 農学部, 助手 (10233199)
FUKUSHIMA Yoshihiro Kyoto Univ. Fac. of Agric. Assoc. Prof., 農学部, 助教授 (00026402)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Stream water quality / Forested watershed / water / Acid rain / pH / Silicate deoxide |
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| Research Abstract |
Attempt has been made to describe changing of solute concentration on the rainfall-runnaff processes in a forested watershed. Measurement of water quality, such as pH, electric conductivity, water temperature, concentration of Cl^-, SO_4^<2->, NO_3^-, Na^+, K^+, Ca^<2+>, Mg^<2+>, NH_4^+ and SiO_2, were carried out at two measuring weirs and at 40 groundwater wells, together with the observation of the discharge rate and groundwater level.
SiO_2 is dissolved from sail mineral during the process of unsaturated vertical infiltration and temporary saturated lateral infiltration of sail water. The SiO_2 concentration of graundwater settles into one value which is peculiar to each watershed(approximately 18mg/l in the case of Kiryu experimental watershed)at saturated zone. It was estimated that apporoximately from 14 to 16g/m^2 of SiO_2 per year is dissolved at surface sail and its boundary with bed rack and run off to stream in Kiryu experimental watershed. Discussions about variations in concentration of Cl^-, SO_4^<2->, NO_3^- with water cycling in a watershed were also presented.
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