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Water 2014, 6(6), 1671-1684; doi:10.3390/w6061671

Effect of Hydrograph Separation on Suspended Sediment Concentration Predictions in a Forested Headwater with Thick Soil and Weathered Gneiss Layers

1
Kyushu Research Centre, Forestry and Forest Product Research Institute, 4-11-16 Kurokami, Kumamoto 860-0862, Japan
2
College of Soil and Water Conservation, Beijing Forestry University, No. 35 Qinghuadong Road, Haidian District, Beijing 100083, China
3
Hokkaido Research Centre, Forestry and Forest Product Research Institute, 7 Hitsujigaoka, Toyohira, Sapporo, Hokkaido 062-8516, Japan
*
Author to whom correspondence should be addressed.
Received: 26 February 2014 / Revised: 16 April 2014 / Accepted: 20 April 2014 / Published: 11 June 2014
(This article belongs to the Special Issue Environmental Tracers)
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Abstract

Two-component hydrograph separation using oxygen-18 concentrations was conducted at a sediment runoff observation weir installed in a small subcatchment of a forested gneiss catchment in Japan. The mean soil thickness of this catchment is 7.27 m, which comprises 3.29 m of brown forest soil (A and B layers) and a 3.98-m layer of heavily weathered gneiss. Data were collected for a storm on 20–21 May 2003, and the percentage of event water separated by the stable isotope ratio in comparison with the total rainfall amount was about 1%. This value is within the ratio of a riparian zone in a drainage area. Temporal variation of suspended sediment concentration exhibited higher correlation with the event water component than with the total runoff or pre-event water component. This shows that the riparian zone causes rainwater to flow out quickly during a rain event, and that this is an important area of sediment production and transportation in a forested headwater with thick soil and weathered gneiss layers. View Full-Text
Keywords: event and pre-event waters; hydrograph separation; subsurface stormflow; suspended sediment; riparian zone event and pre-event waters; hydrograph separation; subsurface stormflow; suspended sediment; riparian zone
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Kabeya, N.; Shimizu, A.; Zhang, J.-J.; Nobuhiro, T. Effect of Hydrograph Separation on Suspended Sediment Concentration Predictions in a Forested Headwater with Thick Soil and Weathered Gneiss Layers. Water 2014, 6, 1671-1684.

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