@article{fdi:010090237,
  title = {{M}odeling vadose zone hydrological processes in naturally occurring piezometric depressions : the {C}hari-{B}aguirmi region, southeastern of the {L}ake {C}had {B}asin, {R}epublic of {C}had},
  author = {{S}iavashani, {N}. {S}. and {V}aldes-{A}bellan, {J}. and {D}o, {F}r{\'e}d{\'e}ric and {J}imenez-{M}artinez, {J}. and {E}lorza, {F}. {J}. and {C}andela, {L}. and {S}errat-{C}apdevila, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {C}hari-{B}aguirmi region, southeastern of the {L}ake {C}had ({A}frica), has a wide naturally occurring piezometric depression with values deeper than the expected regional groundwater level. {T}o date, the most widely accepted hypotheses to explain its origin and dynamics are based on lack of rainwater infiltration and exfiltration processes. {T}he code {HYDRUS}-1{D} is applied to numerically simulate the hydrological flow processes along the unsaturated zone in two soil profiles located in the central part and on the boundary of this piezometric depression under bare and vegetated soil coverage. {T}he simulated time period is 2004-2015 with 715 mm annual rainfall average. {T}he computed recharge with respect to total precipitation accounts for 21% on the boundary and 12% in the central part, which is limited by thick silty low permeability layer on the top surface. {C}onsidering modelling uncertainty and limitations under the simulated climatic conditions, the rainfall effect is observed only at upper soil layers, which leads to low aquifer recharge, while the upward water flux causing water table evaporation is very low. {P}ast climate conditions, capable of developing a drying front to reach the water table after thousands of years of drying and geological structural constraints, may explain the current depressed area.},
  keywords = {{H}ydrus 1{D} ; {V}adose zone ; {P}iezometric depression ; {C}hari {B}aguirmi ; {TCHAD} ; {ZONE} {SOUDANOSAHELIENNE}},
  booktitle = {},
  journal = {{E}nvironmental {E}arth {S}ciences},
  volume = {82},
  numero = {19},
  pages = {444 [16 p.]},
  ISSN = {1866-6280},
  year = {2023},
  DOI = {10.1007/s12665-023-11100-0},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090237},
}