@article{fdi:010089003,
  title = {{T}he internal structure of spring mounds of {N}efzaoua oasis in {T}unisia : formation of an original geomorphic structure [plus supplementary data]},
  author = {{R}addadi, {A}. and {P}odwojewski, {P}ascal},
  editor = {},
  language = {{ENG}},
  abstract = {{S}pring mounds are specific geomorphological landforms in arid or semi-arid environments associated with playas and artesian springs. {S}pring mounds are found worldwide, especially in the great {A}rtesian {B}asin of {A}ustralia and in {N}orth {A}merican and {E}gyptian deserts. {T}hey result from an exceptional succession of climatic, geomorphological and hydrogeological conditions, with processes that follow each other in a specific order. {I}n {T}unisia, in the arid zone, ca. 126 spring mounds have been identified in {N}efzaoua province alone, especially in the oasis east of {C}hott el {J}erid. {T}hey have a conical shape that ranges from 200 to more than 2000?m in diameter and 3-30?m tall, and their centre is hollowed out by an artesian spring of fresh water. {P}alm groves ({P}hoenix dactylifera) spread out at the foot of each mound. {T}he springs have dried up because of the proliferation of borehole wells. {B}ecause of the low electric conductivity ({EC}) of the sediments (<1 m{S}?cm?1) at their base, spring mounds have been excavated and used as a soil amendment to expand new palm plantations. {T}his excavation allows for analysis of their internal structure, which has never been observed well. {I}n the present study, fine analysis of sediment layers in four sections of two representative mounds showed that vegetation had trapped sediment at their base. {F}ine strata of variable texture alternating with variable calcium carbonate, gypsum or organic carbon contents suggest a clear limnic origin. {M}any redoximorphic features, sometimes associated with the presence of old roots, suggest variation in the water level in the centre of the mound. {T}he mounds are capped by a thick layer of indurated gypsum, which helps them resist hydric and aeolian erosion. {T}he origin of the sediment components is discussed.},
  keywords = {{TUNISIE} ; {NEFZAOUA} {REGION} ; {CHOTT} {EL} {JERID}},
  booktitle = {},
  journal = {{E}arth {S}urface {P}rocesses and {L}andforms},
  volume = {49},
  numero = {2},
  pages = {901--917 [+ sulementary data : 12 p.]},
  ISSN = {0360-1269},
  year = {2024},
  DOI = {10.1002/esp.5734},
  URL = {https://www.documentation.ird.fr/hor/fdi:010089003},
}