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

Water

Naoki Kabeya²  Akira Shimizu²  Jian-Jun Zhang¹ 

[1] College of Soil and Water Conservation, Beijing Forestry University, No. 35 Qinghuadong Road, Haidian District, Beijing 100083, China; E-Mail:;Kyushu Research Centre, Forestry and Forest Product Research Institute, 4-11-16 Kurokami, Kumamoto 860-0862, Japan; E-Mail:

关键词: event and pre-event waters;    hydrograph separation;    subsurface stormflow;    suspended sediment;    riparian zone;   

DOI  :  10.3390/w6061671

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.