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Modelling study of the effects of terrace cultivation and artificial drainage on hillslope hydrologic response / Implementation of the geomorphic instantaneous unit hydrograph for distributed flow routing on hill slopes with optimal and non-optimal channel networks

Abstract : Terrace cultivation and artificial drainage were implemented on Mediterranean hillslopes to increase arable land surface and for better water management. Degradation of terraces and channels can lead to an increase in flood risk, erosion and crop damage. To improve our understanding of their effect on hillslope hydrologic response, this thesis compares different modelling approaches. We first simulated the hydrologic response of a Mediterranean catchment (0.91 km2) with terrace cultivation and artificial drainage using a physically-based, fully distributed storm flow model for agricultural catchments. Simulation performance is impressive for some storms, even though the model does not account for terraces. In order to model the effects of terrace cultivation and artificial drainage on hillslope hydrologic response explicitly, we subsequently developed a new distributed model with only geometric and flow velocity parameters, using a linear response time distribution combined with the hillslope geomorphologic instantaneous unit hydrograph. Simulations on virtual hillslopes and catchments with a non-optimal channel network (non-OCN) suggest that (i) hydrologic response is faster and attains higher peak flows for longer interface lengths between agricultural fields and drainage channels; (ii) overland flow velocity has greater influence on peak flow than channel flow velocity; and (iii) the combined effect of increased drainage density and introduction of terrace cultivation is enhanced peak flow at the outlet, and a reduction of peak flow from upstream terraces.
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https://hal.inrae.fr/tel-02809566
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Submitted on : Saturday, June 6, 2020 - 7:09:08 AM
Last modification on : Wednesday, November 11, 2020 - 7:42:03 PM

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  • HAL Id : tel-02809566, version 1
  • PRODINRA : 222521

Citation

Dennis Hallema. Modelling study of the effects of terrace cultivation and artificial drainage on hillslope hydrologic response / Implementation of the geomorphic instantaneous unit hydrograph for distributed flow routing on hill slopes with optimal and non-optimal channel networks. Agricultural sciences. Institut National d'Etudes Supérieures Agronomiques de Montpellier, 2011. English. ⟨tel-02809566⟩

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