@article{fdi:010088469,
  title = {{A} probabilistic framework for assessing the hydrological impact of {F}aidherbia albida in an arid area of {S}enegal},
  author = {{D}iongue, {D}.{M}.{L}. and {B}runetti, {G}. and {S}tumpp, {C}. and {D}o, {F}rederic {C}. and {R}oupsard, {O}. and {O}range, {D}idier and {F}aye, {W}. and {S}ow, {S}. and {J}ourdan, {C}. and {F}aye, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {F}aidherbia tree ({F}aidherbia albida) is frequently used as an intercrop in {S}ahelian agroforestry parklands due to its multi-purpose advantages and reverse phenology. {H}owever, its effect upon the water balance remains unclear, due to the challenges in directly measuring water fluxes in the underlying vadose zone. {M}echanistic hydrological models can be inversely calibrated on transient observations and used to partition different hydrological components, but the computational burden of the analysis can become impractical if the model itself is computationally expensive. {T}o overcome this limitation, and to provide novel insights into the hydrological role of {F}aidherbia, we combine a low-fidelity, one-dimensional hydrological model ({HYDRUS}-1{D}) with a kriging-based correction function to emulate the response of a high-fidelity, two-dimensional axisymmetric description of the system ({HYDRUS}-2{D}). {M}ultiannual measurements of soil moisture and sap flow in a {S}enegal agroforestry parkland are used in conjunction with {B}ayesian inference to calibrate the resulting validated multifidelity surrogate, and to inversely estimate soil hydraulic and root water uptake parameters. {R}esults show that the model can reproduce observations with good accuracy and limited uncertainty for both the calibration and the validation phases, and also confirm the phreatophytic behaviour of {F}aidherbia by indicating the existence of a moderately compensated root water uptake. {M}oreover, a local sensitivity analysis suggests that a fully compensated uptake could potentially reduce groundwater recharge by 13%. {I}nterestingly, estimated soil hydraulic parameters hint at the possibility of root-induced changes in soil hydraulic properties that mimic preferential and/or macropore flow, resulting in sustained recharge fluxes (? 26% of the annual precipitation). {T}he analysis indicates that overall, {F}aidherbia could have a net positive effect upon the water balance in arid areas.},
  keywords = {{SENEGAL}},
  booktitle = {},
  journal = {{J}ournal of {H}ydrology},
  volume = {622},
  numero = {},
  pages = {129717 [16 ]},
  ISSN = {0022-1694},
  year = {2023},
  DOI = {10.1016/j.jhydrol.2023.129717},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088469},
}