@inproceedings{fdi:010021124,
  title = {{D}issolved matter fluxes in the inner delta of the river {N}iger},
  author = {{B}ricquet, {J}ean-{P}ierre and {G}ourcy, {L}aurence and {M}ah{\'e}, {G}il and {O}range, {D}idier and {P}icou{\¨e}t, {C}{\'e}cile and {O}livry, {J}ean-{C}laude},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study is part of the {EQUANIS} programme, the objectives of which are (a) estimating inputs from the {R}iver {N}iger to the inner {D}elta ; (b) computing the hydrological balance ; and (c) monitoring the quality of water in the central lacustrine basin. {E}leven sampling locations were selected near gauging stations, both on the {N}iger {R}iver and its main tributary of the {B}ani {R}iver. {T}hose sites have been sampled weekly since {J}uly 1990. {T}he inner delta of the {N}iger {R}iver is a system particularly subject to sahelian and sub-desert climatic conditions and characterized by large flood plains. {T}ime series of input water volumes in the inner delta, and of the water losses within it, show that the water losses are high, due to the intense evaporation, and vary from 6 to 40 km3. {T}he water losses reach their maximum during the wettest years - up to 47%, and minimum during the driest years - only 32%, due to the reduction of the flooded area. {T}he surface of the flooded area is inferred from the hydrological balance. {T}he preliminary results of this study indicate that the {N}iger and {B}ani rivers have low levels of dissolved element concentrations. {T}he mean conductivity values, ranging from 50-80 micro{S}iemens/cm, increase regularly during the low water stage and decrease drastically with rising water. {T}he p{H} values are slightly basic, ranging from 7.1 to 8. silica and bicarbonates are the main dissolved species ; they always represent more than 75% of {TDS}. {I}n {M}ay, when the rising water stage begins, the waters are poorly mineralized at the input of the delta, while they have been enriched during the dry season in the delta. {A} good mass balance is found between inputs and outputs through the delta. {H}owever, a disequilibrium appears at the sampling sites within the basin, which could be partially linked to poor mixing between the {N}iger and {B}ani river waters... ({D}'apr{\`e}s r{\'e}sum{\'e} d'auteur)},
  keywords = {{COURS} {D}'{EAU} ; {MATIERE} {EN} {SOLUTION} ; {MATIERE} {EN} {SUSPENSION} ; {SOLUTE} ; {BILAN} {HYDROLOGIQUE} ; {FLUX} {HYDRIQUE} ; {EVAPORATION} ; {QUALITE} {DE} {L}'{EAU} ; {CYCLE} {HYDROLOGIQUE} ; {VARIATION} {SAISONNIERE} ; {ETUDE} {REGIONALE} ; {MALI} ; {NIGER} {DELTA} {CENTRAL} ; {DEBO} {LAC} ; {DIAKA} {COURS} {D}'{EAU} ; {BANI} {COURS} {D}'{EAU}},
  numero = {253},
  pages = {435--445},
  booktitle = {{H}ydrology in the humid tropic environment ({L}a hidrologia en el medio tropical humedo)},
  year = {1998},
  URL = {https://www.documentation.ird.fr/hor/fdi:010021124},
}