Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica
The profitability of hydropower in Costa Rica is affected by soil erosion and sedimentation in dam reservoirs, which are in turn influenced by land use, infiltration and aquifer interactions with surface water. In order to foster the provision and payment for Hydrological Environmental Services...
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2015
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| Online Access: | https://repositorio.catie.ac.cr/handle/11554/8084 |
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RepoCATIE80842021-12-22T20:26:45Z Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica Gómez Delgado, F Roupsard, O. Maire, G. le Taugourdeau, S. Pérez, A. Oijen, M. van Vaast, P. Rapidel, B. Harmand, J.M. Voltz, M. Bonnefond, J.M Imbach, Pablo A. Moussa, R. COFFEA ARABICA AGROFORESTERIA CUENCAS HIDROGRAFICAS HIDROLOGIA MODELOS SERVICIOS AMBIENTALES PAGO COSTA RICA The profitability of hydropower in Costa Rica is affected by soil erosion and sedimentation in dam reservoirs, which are in turn influenced by land use, infiltration and aquifer interactions with surface water. In order to foster the provision and payment for Hydrological Environmental Services (HES), a quantitative assessment of the impact of specific land uses on the functioning of drainage-basins is required. The present paper aims to study the water balance partitioning in a volcanic coffee agroforestry microbasin (1 km2, steep slopes) in Costa Rica, as a first step towards evaluating sediment or contaminant loads. The main hydrological processes were monitored during one year, using flume, eddy-covariance flux tower, soil water profiles and piezometers. A new Hydro-SVAT lumped model is proposed, that balances SVAT (Soil Vegetation Atmosphere Transfer) and basin-reservoir routines. The purpose of such a coupling was to achieve a trade-off between the expected performance of ecophysiological and hydrological models, which are often employed separately and at different spatial scales, either the plot or the basin. The calibration of the model to perform streamflow yielded a Nash-Sutcliffe (NS) coefficient equal to 0.89 for the year 2009, while the validation of the water balance partitioning was consistent with the independent measurements of actual evapotranspiration (R2 = 0.79, energy balance closed independently), soil water content (R2 = 0.35) and water table level (R2 = 0.84). Eight months of data from 2010 were used to validate modelled streamflow, resulting in a NS = 0.75. An uncertainty analysis showed that the streamflow modelling was precise for nearly every time step, while a sensitivity analysis revealed which parameters mostly affected model precision, depending on the season. It was observed that 64% of the incident rainfall R flowed out of the basin as streamflow and 25% as evapotranspiration, while the remaining 11% is probably explained by deep percolation, measurement errors and/or inter-annual changes in soil and aquifer water stocks. The model indicated an interception loss equal to 4% of R, a surface runoff of 4% and an infiltration component of 92%. The modelled streamflow was constituted by 87% of baseflow originating from the aquifer, 7% of subsurface nonsaturated runoff and 6% of surface runoff. Given the low surface runoff observed under the current physical conditions (andisol) and management practices (no tillage, planted trees, bare soil kept by weeding), this agroforestry system on a volcanic soil demonstrated potential to provide valuable HES, such as a reduced superficial displacement-capacity for fertilizers, pesticides and sediments, as well as a streamflow regulation function provided by the highly efficient mechanisms of aquifer recharge and discharge. The proposed combination of experimentation and modelling across ecophysiological and hydrological approaches proved to be useful to account for the behaviour of a given basin, so that it can be applied to compare HES provision for different regions or management alternatives. 2015-11-20T21:36:01Z 2015-11-20T21:36:01Z 2011 Artículo https://repositorio.catie.ac.cr/handle/11554/8084 en Programa de Cambio Climático y Cuencas (PCCC) pdf application/pdf |
| institution |
Centro Agronómico Tropical de Investigación y Enseñanza |
| collection |
Repositorio CATIE |
| language |
Inglés |
| topic |
COFFEA ARABICA AGROFORESTERIA CUENCAS HIDROGRAFICAS HIDROLOGIA MODELOS SERVICIOS AMBIENTALES PAGO COSTA RICA |
| spellingShingle |
COFFEA ARABICA AGROFORESTERIA CUENCAS HIDROGRAFICAS HIDROLOGIA MODELOS SERVICIOS AMBIENTALES PAGO COSTA RICA Gómez Delgado, F Roupsard, O. Maire, G. le Taugourdeau, S. Pérez, A. Oijen, M. van Vaast, P. Rapidel, B. Harmand, J.M. Voltz, M. Bonnefond, J.M Imbach, Pablo A. Moussa, R. Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica |
| description |
The profitability of hydropower in Costa Rica
is affected by soil erosion and sedimentation in dam reservoirs,
which are in turn influenced by land use, infiltration
and aquifer interactions with surface water. In order to foster
the provision and payment for Hydrological Environmental
Services (HES), a quantitative assessment of the impact of
specific land uses on the functioning of drainage-basins is
required. The present paper aims to study the water balance
partitioning in a volcanic coffee agroforestry microbasin
(1 km2, steep slopes) in Costa Rica, as a first step towards
evaluating sediment or contaminant loads. The main
hydrological processes were monitored during one year, using
flume, eddy-covariance flux tower, soil water profiles
and piezometers. A new Hydro-SVAT lumped model is
proposed, that balances SVAT (Soil Vegetation Atmosphere
Transfer) and basin-reservoir routines. The purpose of such
a coupling was to achieve a trade-off between the expected
performance of ecophysiological and hydrological models,
which are often employed separately and at different spatial
scales, either the plot or the basin. The calibration of
the model to perform streamflow yielded a Nash-Sutcliffe
(NS) coefficient equal to 0.89 for the year 2009, while the validation of the water balance partitioning was consistent
with the independent measurements of actual evapotranspiration
(R2 = 0.79, energy balance closed independently), soil
water content (R2 = 0.35) and water table level (R2 = 0.84).
Eight months of data from 2010 were used to validate modelled
streamflow, resulting in a NS = 0.75. An uncertainty
analysis showed that the streamflow modelling was precise
for nearly every time step, while a sensitivity analysis revealed
which parameters mostly affected model precision,
depending on the season. It was observed that 64% of the
incident rainfall R flowed out of the basin as streamflow
and 25% as evapotranspiration, while the remaining 11% is
probably explained by deep percolation, measurement errors
and/or inter-annual changes in soil and aquifer water stocks.
The model indicated an interception loss equal to 4% of R, a
surface runoff of 4% and an infiltration component of 92%.
The modelled streamflow was constituted by 87% of baseflow
originating from the aquifer, 7% of subsurface nonsaturated
runoff and 6% of surface runoff. Given the low
surface runoff observed under the current physical conditions
(andisol) and management practices (no tillage, planted trees,
bare soil kept by weeding), this agroforestry system on a volcanic
soil demonstrated potential to provide valuable HES,
such as a reduced superficial displacement-capacity for fertilizers,
pesticides and sediments, as well as a streamflow regulation
function provided by the highly efficient mechanisms of aquifer recharge and discharge. The proposed combination
of experimentation and modelling across ecophysiological
and hydrological approaches proved to be useful to account
for the behaviour of a given basin, so that it can be
applied to compare HES provision for different regions or
management alternatives. |
| format |
Artículo |
| author |
Gómez Delgado, F Roupsard, O. Maire, G. le Taugourdeau, S. Pérez, A. Oijen, M. van Vaast, P. Rapidel, B. Harmand, J.M. Voltz, M. Bonnefond, J.M Imbach, Pablo A. Moussa, R. |
| author_facet |
Gómez Delgado, F Roupsard, O. Maire, G. le Taugourdeau, S. Pérez, A. Oijen, M. van Vaast, P. Rapidel, B. Harmand, J.M. Voltz, M. Bonnefond, J.M Imbach, Pablo A. Moussa, R. |
| author_sort |
Gómez Delgado, F |
| title |
Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica |
| title_short |
Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica |
| title_full |
Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica |
| title_fullStr |
Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica |
| title_full_unstemmed |
Modelling the hydrological behaviour of a coffee agroforestry basin in Costa Rica |
| title_sort |
modelling the hydrological behaviour of a coffee agroforestry basin in costa rica |
| publishDate |
2015 |
| url |
https://repositorio.catie.ac.cr/handle/11554/8084 |
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| _version_ |
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