@incollection{fdi:010087867,
  title = {{H}ydroclimatic dynamics of upstream {U}bangi river at {M}obaye, {C}entral {A}frican {R}epublic : comparative study of the role of savannah and equatorial forest},
  author = {{N}guimalet, {C}.{R} and {O}range, {D}idier and {W}aterendji, {J}.{P}. and {Y}ambele, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he rainfall reduction in the 1970s, less marked in {C}entral {A}frica than in {W}est {A}frica, still had a major impact on the hydrological regimes of the region's large rivers. {T}he study of the hydropluviometric behavior of the {U}bangi {R}iver at {M}obaye  has the advantage of being a study of a basin excluding anthropogenic impact. {F}orest cover and population density have not changed since at least 1970. {S}tatistical analysis of the breaks in the long rainfall time series to {M}obaye (1938-2015) confirms a long period of drought from 1969 to 2006, corresponding to a reduction of 8% in rainfall. {A}lso, the study of the corresponding hydrological series indicates a second downward break in 1981, marking an exceptional hydrological drought.  {F}lows increased in 2013, a few years after the rainfall increase. {T}he statistical study of the annual rainfall/flow series of the upstream basins over the period 1951-1995 (the {K}otto {R}iver in {K}embe and {B}ria, the {M}bomu {R}iver in {B}angassou and {Z}emio, and the {U}ele {R}iver + {B}ili hydrographic system) highlights different hydrological behaviors related to the vegetation cover. {O}n the one hand, the savannah basins show a continuous hydrological deficit marked by a runoff coefficient ({CE}) that fell to only 5% from the 1990s.  {O}n the other hand, the basins under forest show a runoff increase since 1990, marked by a {CE} above 10%. {U}nder savannah, the part of the flow infiltrating to recharge the aquifer would have decreased faster than under forest, which results in a runoff {CE} very significantly negatively correlated with the savannah area present in the studied watershed.},
  keywords = {{PRECIPITATION} ; {REGIME} {HYDROLOGIQUE} ; {PLUVIOMETRIE} ; {DEBIT} ; {VARIATION} {ANNUELLE} ; {SECHERESSE} ; {RUISSELLEMENT} ; {AQUIFERE} ; {ETUDE} {COMPARATIVE} ; {COUVERT} {VEGETAL} ; {SAVANE} ; {FORET} {DENSE} ; {COURS} {D}'{EAU} ; {BASSIN} {VERSANT} ; {SERIE} {CHRONOLOGIQUE} ; {CHANGEMENT} {CLIMATIQUE} ; 1938 2015 ; {CENTRAFRIQUE} ; {OUBANGUI} {COURS} {D}'{EAU} ; {MOBAYE} ; {KOTTO} {COURS} {D}'{EAU} ; {KEMBE} ; {BRIA} ; {MBOMU} {COURS} {D}'{EAU} ; {BANGASSOU} ; {ZEMIO} ; {UELE} {COURS} {D}'{EAU} ; {BILI} {COURS} {D}'{EAU}},
  booktitle = {{C}ongo basin hydrology, climate, and biogeochemistry : a foundation for the future},
  numero = {269},
  pages = {83--96},
  address = {{W}ashington ({USA}) ; {H}oboken},
  publisher = {{AGU} ; {W}iley},
  series = {{G}eophysical {M}onograph},
  year = {2022},
  DOI = {10.1002/9781119657002.ch6},
  ISBN = {9781119656975},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087867},
}