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Journal of Arid Land  2014, Vol. 6 Issue (6): 647-655    DOI: 10.1007/s40333-014-0066-9
Research Articles     
Evaluation of an erosion-sediment transport model for a hillslope using laboratory flume data
Anya Catherine C ARGUELLES1, MinJae JUNG2, Kristine Joy B MALLARI2, GiJung PAK1, Hafzullah AKSOY3, Levent M KAVVAS4, Ebru ERIS5, JaeYoung YOON1,2*, YoungJoon LEE6, SeonHwa HONG6
1 Department of Environmental Engineering, Korea University, Sejong 339-700, Korea;
2 Program in Environmental Technology and Policy, Korea University, Sejong 339-700, Korea;
3 Department of Civil Engineering, Istanbul Technical University, Maslak 34469, Istanbul, Turkey;
4 Department of Civil and Environmental Engineering, University of California, Davis, California 95616, USA;
5 Department of Civil Engineering, Ege University, Bornova 35100, Izmir, Turkey;
6 Geum-River Environment Research Center, National Institute of Environmental Research, Okcheon, Chungbuk 373-804, Korea
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Abstract  Climate change can escalate rainfall intensity and cause further increase in sediment transport in arid lands which in turn can adversely affect water quality. Hence, there is a strong need to predict the fate of sediments in order to provide measures for sound erosion control and water quality management. The presence of micro-topography on hillslopes influences processes of runoff generation and erosion, which should be taken into account to achieve more accurate modelling results. This study presents a physically based mathematical model for erosion and sediment transport coupled to one-dimensional overland flow equations that simulate rainfall-runoff generation on the rill and interrill areas of a bare hillslope. Modelling effort at such a fine resolution considering the flow con-nection between interrill areas and rills is rarely verified. The developed model was applied on a set of data gath-ered from an experimental setup where a 650 cm×136 cm erosion flume was pre-formed with a longitudinal rill and interrill having a plane geometry and was equipped with a rainfall simulator that reproduces natural rainfall char-acteristics. The flume can be given both longitudinal and lateral slope directions. For calibration and validation, the model was applied on the experimental results obtained from the setup of the flume having 5% lateral and 10% longitudinal slope directions under rainfall intensities of 105 and 45 mm/h, respectively. Calibration showed that the model was able to produce good results based on the R2 (0.84) and NSE (0.80) values. The model performance was further tested through validation which also produced good statistics (R2=0.83, NSE=0.72). Results in terms of the sedigraphs, cumulative mass curves and performance statistics suggest that the model can be a useful and an important step towards verifying and improving mathematical models of erosion and sediment transport.

Key wordssoil respiration      temperature sensitivity      Q10 model      soil abiotic CO2 exchange      soil alkalinity     
Received: 24 March 2013      Published: 10 December 2014
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Anya Catherine C ARGUELLES, MinJae JUNG, Kristine Joy B MALLARI, GiJung PAK, Hafzullah AKSOY, Levent M KAVVAS, Ebru ERIS, JaeYoung YOON, YoungJoon LEE, SeonHwa HONG. Evaluation of an erosion-sediment transport model for a hillslope using laboratory flume data. Journal of Arid Land, 2014, 6(6): 647-655.

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