@article{fdi:010086789,
  title = {{E}stimating water fluxes in the critical zone using water stable isotope approaches in the {G}roundnut and {F}erlo basins of {S}enegal},
  author = {{D}iongue, {D}. {M}. {L}. and {S}tumpp, {C}. and {R}oupsard, {O}. and {O}range, {D}idier and {D}o, {F}. {C}. and {F}aye, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ustainable water management in semi-arid agriculture practices requires quantitative knowledge of water fluxes within the soil-vegetation-atmosphere system. {T}herefore, we used stable-isotope approaches to evaluate evaporation ({E}-a), transpiration ({T}-a), and groundwater recharge ({R}) at sites in {S}enegal's {G}roundnut basin and {F}erlo {V}alley pasture region during the pre-monsoon, monsoon, and post-monsoon seasons of 2021. {T}he approaches were based upon (i) the isothermal evaporation model (for quantifying {E}-a); (ii) water and isotope mass balances (to partition {E}-a and {T}-a for groundnut and pasture); and (iii) the piston displacement method (for estimating {R}). {E}-a losses derived from the isothermal evaporation model corresponded primarily to {S}tage {II} evaporation, and ranged from 0.02 to 0.09 mm d(-1) in the {G}roundnut basin, versus 0.02-0.11 mm d(-1) in {F}erlo. {A}t the groundnut site, {E}-a rates ranged from 0.01 to 0.69 mm d(-1); {T}-a was in the range 0.55-2.29 mm d(-1); and the {T}-a/{ET}a ratio was 74%-90%. {A}t the pasture site, the ranges were 0.02-0.39 mm d(-1) for {E}-a; 0.9-1.69 mm d(-1) for {T}-a; and 62-90% for {T}-a/{ET}a. {T}he {ET}a value derived for the groundnut site via the isotope approach was similar to those from eddy covariance measurements, and also to the results from the previous validated {HYDRUS}-1{D} model. {H}owever, the {HYDRUS}-1{D} model gave a lower {T}-a/{ET}a ratio (23.2%). {T}he computed groundwater recharge for the groundnut site amounted to less than 2% of the local annual precipitation. {R}ecommendations are made regarding protocols for preventing changes to isotopic compositions of water in samples that are collected in remote arid regions, but must be analysed days later. {T}he article ends with suggestions for studies to follow up on evidence that local aquifers are being recharged via preferential pathways.},
  keywords = {evapotranspiration ; recharge ; semi-arid ; stable isotopes ; water balance ; {SENEGAL}},
  booktitle = {},
  journal = {{H}ydrological {P}rocesses},
  volume = {37},
  numero = {1},
  pages = {e14787 [21 p.]},
  ISSN = {0885-6087},
  year = {2023},
  DOI = {10.1002/hyp.14787},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086789},
}