End Members Contributing to Snowmelt and Rain-on-snow Runoff Generation in Kawakami Headwater Catchment, Central Japan

Collection Location Perpustakaan Pusat Penelitian Geoteknologi - LIPI Contact Detail
Edition vol 23 no 1
Call Number
ISBN/ISSN 01259849
Author(s) Subagyono, Kasdi
Subject(s)
Classification
Series Title Jurnal Riset Geologi dan Pertambangan
GMD Jurnal
Language English
Publisher Pusat Penelitian Geoteknologi LIPI
Publishing Year 2013
Publishing Place Bandung
Collation
Abstract/Notes Determination of end members contributing to runoff generation is crucial for characterizing hydrological processes in temperate region. The study was conducted toward the snowmelt event on March 28, 2001 and rain-on-snow event on March 29, 2001 in Kawakami Experimental Basin (KEB), Nagano Prefecture, Central Japan. Hydrometric and hydrochemical measurements were conducted and EMMA using Ca2+ and SO42- was used to analyze end-member contributing to runoff generation. Three end member of near surface riparian, hill slope soil water and deep riparian groundwater had been identified as the major end members contributing to snowmelt runoff generation in this catchment with respectively 55%, 23% and 22% and 73%, 12%, and 15% respectively during snow melt and rain-on-snow event. Hydrometric analysis showed that subsurface runoff during snowmelt event and rain-on-snow is dominated by shallow subsurface flow especially within riparian zone, the reason why near surface riparian considerably contributed to total runoff. Peak snowmelt runoff occurred at around 14.00 during March 28, 2001 of snowmelt runoff event, which is in accordance with peak air temperature. Meanwhile the peak of rain-on-snow runoff occurred at 16:00, at which the amount of the rainfall was observed to be the determinant factor.
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