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Hydrological, ecophysiological and sediment processes in a coffee agroforestry basin : combining experimental and modelling methods to assess Hydrological Environmental Services

Abstract : The profitability of hydropower is affected by soil erosion and sedimentation in dam reservoirs, which are influenced by land use, infiltration and aquifer interactions with surface water. In order to promote the payment of Hydrological Environmental Services (HES) in Costa Rica, a quantitative assessment of the impact of land uses (such as coffee farming) on the functioning of drainage basins is required. This thesis seeks: 1) to study the water balance partitioning in a newly installed coffee agroforestry basin 2) to estimate the water and sediment yield at various spatio-temporal scales: from plot to basin and from event to annual scale; and 3) to simulate the water and sediment yields, at both annual and peakflow scale, by including the surface runoff from hillslopes and roads. The main hydrological, ecophysiological and sediment processes were monitored during one year at the basin (rainfall, streamflow, evapotranspiration, soil humidity, aquifer level, turbidity) and at the plots (surface runoff and erosion). A new eco-hydrological model was developed to close the water balance, and the annual sediment yield was also quantified. Improvements are in progress to take into account the effect of roads in surface runoff generation. The low surface runoff, low plot erosion and low basin sediment yield observed under the current biophysical conditions (andisol) and management practices (no tillage, planted trees, bare soil kept by weeding), offer potential HES by reducing the superficial displacement capacity for fertilizers and pesticides, yielding low sediment loads and regulating streamflow variability through highly efficient mechanisms of aquifer recharge-discharge.
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https://hal.inrae.fr/tel-02822140
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Submitted on : Saturday, June 6, 2020 - 8:04:15 PM
Last modification on : Wednesday, November 11, 2020 - 7:42:03 PM

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  • HAL Id : tel-02822140, version 1
  • PRODINRA : 353197

Citation

Fédérico Gomez-Delgado. Hydrological, ecophysiological and sediment processes in a coffee agroforestry basin : combining experimental and modelling methods to assess Hydrological Environmental Services. Hydrology. Institut National d'Etudes Supérieures Agronomiques de Montpellier, 2010. English. ⟨tel-02822140⟩

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