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Seasonal changes in runoff characteristics on a permafrost watershed in the southern mountainous region of eastern Siberia
Author(s) -
Yamazaki Yusuke,
Kubota Jumpei,
Ohata Tetsuo,
Vuglinsky Varely,
Mizuyama Takahisa
Publication year - 2005
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.5914
Subject(s) - surface runoff , permafrost , evapotranspiration , hydrology (agriculture) , environmental science , precipitation , watershed , geology , oceanography , geography , meteorology , ecology , geotechnical engineering , machine learning , computer science , biology
Abstract We attempted to clarify the runoff characteristics of a permafrost watershed in the southern mountainous region of eastern Siberia using hydrological and meteorological data obtained by the State Hydrological Institute in Russia from 1976 to 1985. We analysed seasonal changes in the direct runoff ratio and recession gradient during the permafrost thawing period. Thawing depth began to increase from the beginning of May and continued to increase until the end of September, exceeding 150 cm. Annual precipitation and discharge were in the range 525–649 mm and 205–391 mm respectively. The sum of the annual evapotranspiration and changes in water storage ranged from 235 to 365 mm. The mean daily evapotranspiration in June, July, August and September was 1·5 mm day −1 , 1·7 mm day −1 , 1·5 mm day −1 , and 0·5 mm day −1 respectively. The direct runoff ratio was highest in June, decreasing from 0·8 in June to 0·2 in September. The recession gradient also decreased from June to September. Since the frozen soil functioned as an impermeable layer, the soil water storage capacity in the thawing part of the soil, the depth of which changed over time, controlled the runoff characteristics. Copyright © 2005 John Wiley & Sons, Ltd.