✦ LIBER ✦

Diurnal variations in streamflow and water quality during the summer dry season

✍ Scribed by Daiji Kobayashi; Yuji Kodama; Yoshiyuki Ishii; Yumiko Tanaka; Keisuke Suzuki

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 457 KB
Volume: 9
Category: Article
ISSN: 0885-6087
DOI: 10.1002/hyp.3360090709

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

In a headwater basin covered with boreal forest in northern Japan, the summer dry flow was monitored each summer from 1985 to 1993. Streamflow and specific electrical conductance fluctuated diurnally and these variations were attributed to daytime evapotranspiration. In 1989, the daytime reduction in streamflow and conductance were accompanied by a reduction in the HCO^−^~3~ concentration.

The low flow hydrograph was separated into two components using HCO^−^~3~ and Cl^−^ concentrations in August 1989, assuming low flow to be a mixture of delayed subsurface flow and of quick shallow flow. The slight diurnal variation in the ratio of shallow flow to subsurface flow caused the diurnal variation in conductance by changing the HCO^−^~3~ concentration.

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