@article{fdi:010055939,
  title = {{I}mpact de la variabilit{\'e} climatique et du barrage {N}angb{\'e}to sur l'hydrologie du syst{\`e}me {M}ono-{C}ouffo ({A}frique de l_{O}uest) = {I}mpact of climatic variability and the {N}angbeto dam on the hydrology of the {M}ono-{C}ouffo system ({W}est {A}frica)},
  author = {{A}moussou, {E}. and {C}amberlin, {P}. and {M}ah{\'e}, {G}il},
  editor = {},
  language = {{FRE}},
  abstract = {{E}n {A}frique tropicale, de nombreuses {\'e}tudes sur la variabilit{\'e} climatique montrent qu_une tendance {\`a} la s{\'e}cheresse s_est manifest{\'e}e {\`a} partir de la fin des ann{\'e}es 1960. {C}ette s{\'e}cheresse a affect{\'e} aussi l_hydrosyst{\`e}me {M}ono-{C}ouffo, en {A}frique de l_{O}uest, avec une persistance remarquable qui s_est r{\'e}percut{\'e}e sur les {\'e}coulements. {D}epuis 1988, avec la mise en eau du barrage de {N}angb{\'e}to, qui co{\¨ie}ncide avec une l{\'e}g{\`e}re reprise pluviom{\'e}trique dans les ann{\'e}es 1990, on assiste {\`a} une modification du r{\'e}gime hydrologique du {M}ono {\`a} {A}thi{\'e}m{\'e}. {L}es m{\'e}thodes statistiques appliqu{\'e}es aux donn{\'e}es mensuelles de pluie et d{\'e}bit de la p{\'e}riode 1961_2000 ont permis de constater que les d{\'e}ficits pluviom{\'e}triques des d{\'e}cennies 1970 et 1980 ont engendr{\'e} des d{\'e}ficits de l_{\'e}coulement. {M}ais, avec la l{\'e}g{\`e}re reprise pluviom{\'e}trique (2%) de 1988 {\`a} 2000, on assiste {\`a} un exc{\'e}dent d_{\'e}coulement de 37% sur le {M}ono {\`a} {A}thi{\'e}m{\'e} {\`a} r{\'e}gime « artificiel » depuis 1988; et, par contre, pas d_exc{\'e}dent (0,1%) sur le {C}ouffo {\`a} {L}anta {\`a} r{\'e}gime "naturel". {M}any studies dealing with climatic variability in tropical {A}frica show a trend toward drought since the end of the 1960s. {T}his drought, which affects {W}est {A}frica and the {M}ono-{C}ouffo hydrosystem, has had a marked effect on river flows, causing considerable decreases in daily, monthly and annual flows. {H}owever, since 1988, with the impoundment of the {N}angbeto {R}eservoir, which coincided with the slight recovery of rainfall in the 1990s, there has been a change in the hydrological regime of the {M}ono {R}iver at {A}thieme. {S}tatistical methods applied to time series of monthly rainfall and flow data for the period 1961-2000 enabled us to show that the rainfall deficits of the 1970s and 1980s generated deficits of flow, and consequently deficit in net recharge. {H}owever, with the slight recovery of rainfall (2%) from 1988 to 2000 compared to the sub-period 1961-1987, there is an excess flow of 37% on the {M}ono at {A}thieme, under an "artificial" regime since 1988; and no surplus (0.1%) on the {C}ouffo at {L}anta under a "natural" regime.},
  keywords = {hydrosystem ; rainfall-runoff relationships ; dam ; river regime ; {M}ono-{C}ouffo ; {W}est {A}frica},
  booktitle = {},
  journal = {{H}ydrological {S}ciences {J}ournal = {J}ournal des {S}ciences {H}ydrologiques},
  volume = {57},
  numero = {4},
  pages = {805--817},
  ISSN = {0262-6667},
  year = {2012},
  DOI = {10.1080/02626667.2011.643799},
  URL = {https://www.documentation.ird.fr/hor/fdi:010055939},
}