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Comparison of runoff characteristics of two adjacent basins in a tropical rainforest using a modified hydrologic cycle model with outflow

Authors

  • Taeko Wakahara,

    Corresponding author
    1. Institute of Symbiotic Science and Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
    • Correspondence to: Taeko Wakahara, Institute of Symbiotic Science and Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan.

      E-mail: amusel@cc.tuat.ac.jp

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  • Katsushige Shiraki,

    1. Institute of Symbiotic Science and Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
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  • Masakazu Suzuki

    1. Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
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Abstract

We propose a new runoff model including an outflow process that was applied to two adjacent basins (CL, TL) located in Lambir Hills National Park in north-central Sarawak, Malaysia. Rainfall, runoff, topography, and soil layer thickness were observed. About 19% of annual runoff was observed in the CL basin (21.97 ha), whereas about 46% was observed in the TL basin (23.25 ha). It was inferred that the CL basin has an outflow because of low base flow, small runoff peak, and excessive water loss. By incorporating the outflow process into the HYdrological CYcle MODEL, good agreement between the data generated by the model and that observed was shown, with the exception of the data from the rainless period. Then, the fitting parameters for each basin were exchanged, except for the outflow parameter, and the characteristics of each basin were compared by calculating virtual runoff. As a result, the low base flow of the CL basin was estimated by the movement of the rainwater that escaped from the basin as deep percolation or lateral flow (11% of rainfall). The potential of the CL basin for mitigating flood and drought appeared to be higher than that of the TL basin. This is consistent with the topographic characteristics of the CL basin, which has a gentler slope than the TL basin. Copyright © 2012 John Wiley & Sons, Ltd.

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