Imperial College London

Dr Boris F. Ochoa-Tocachi

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Research Associate
 
 
 
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Contact

 

+44 (0)20 7594 6018boris.ochoa13 CV

 
 
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Location

 

411Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ochoa-Tocachi:2019:10.1002/ldr.3202,
author = {Ochoa-Tocachi, B and Alemie, T and Guzman, CD and Tilahun, SA and Zimale, FA and Buytaert, W and Steenhuis, TS},
doi = {10.1002/ldr.3202},
journal = {Land Degradation and Development},
pages = {151--165},
title = {Sensitivity analysis of the parameter-efficient distributed (PED) model for discharge and sediment concentration estimation in degraded humid landscapes},
url = {http://dx.doi.org/10.1002/ldr.3202},
volume = {30},
year = {2019}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Sustainable development in degraded landscapes in the humid tropics require effective soil and water management practices. Coupled hydrologicalerosion models have been used to understand and predict the underlying processes at watershed scale and the effect of human interventions. One prominent tool is the parameterefficient distributed (PED) model, which improves on other models by considering a saturationexcess runoff generation driving erosion and sediment transport in humid climates. This model has been widely applied at different scales for the humid monsoonal climate of the Ethiopian Highlands, with good success in estimating discharge and sediment concentrations. However, previous studies performed manual calibration of the involved parameters without reporting sensitivity analyses or assessing equifinality. The aim of this article is to provide a multiobjective global sensitivity analysis of the PED model using automatic random sampling implemented in the SAFE Toolbox. We find that relative parameter sensitivity depends greatly on the purpose of model application and the outcomes used for its evaluation. Five of the 13 PED model parameters are insensitive for improving model performance. Additionally, associating behavioural parameter values with a clear physical meaning provides slightly better results and helps interpretation. Lastly, good performance in one module does not translate directly into good performance in the other module. We interpret these results in terms of the represented hydrological and erosion processes and recommend field data to inform model calibration and validation, potentially improving land degradation understanding and prediction and supporting decisionmaking for soil and water conservation strategies in degraded humid landscapes.
AU - Ochoa-Tocachi,B
AU - Alemie,T
AU - Guzman,CD
AU - Tilahun,SA
AU - Zimale,FA
AU - Buytaert,W
AU - Steenhuis,TS
DO - 10.1002/ldr.3202
EP - 165
PY - 2019///
SN - 1085-3278
SP - 151
TI - Sensitivity analysis of the parameter-efficient distributed (PED) model for discharge and sediment concentration estimation in degraded humid landscapes
T2 - Land Degradation and Development
UR - http://dx.doi.org/10.1002/ldr.3202
UR - http://hdl.handle.net/10044/1/65598
VL - 30
ER -