@article{fdi:010088744,
  title = {{S}patiotemporal variability in the hydrological regimes and water resources of the {O}uham {R}iver {B}asin at {B}atangafo, {C}entral {A}frican {R}epublic},
  author = {{N}guimalet, {C}. {R}. and {O}range, {D}idier},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper examines the effect of rainfall decline on water resources in each sub-basin ({B}ozoum: 8100 km2 and {B}ossangoa: 22,800 km2) and at the outlet of {B}atangafo (43,650 km2) over the 1951-1995 period, due to a lack of measurements since 1996. {A}nnual, monthly, and daily series of rainfall and discharges were subjected to statistical tests (rainfall and flow indices, {SPI}, search for ruptures/breaks, depletion coefficient, and potential groundwater discharge) to present and discuss the rainfall variability impact on the water resources of the whole basin. {T}he average rainfall per sub-basin decreases from the west to the east according to the {O}uham river direction: 1423 mm at {B}ozoum, 1439 mm at {B}ossangoa, and 1393 mm at {B}atangafo, the main outlet. {T}he {SPI} approach provides evidence of a moderate to normal drought in the whole basin in the 1980s, mainly compared to the 1970s. {T}hus, deficient breaks in the rainfall series of the {O}uham {B}asin at {B}atangafo were noticed in 1967 ({B}ossangoa and {B}atangafo) and 1969 ({B}ozoum). {A} declining rainfall of -5% on average tended to have the highest impact on the runoff deficit, from about -30 to -43%. {T}he deficit seems more important from west to east, and is also high over the groundwater in each outlet (-33% at {B}ozoum, -29% at {B}ossangoa, and -31% at {B}atangafo) in the 1986-1995 period, despite rainfall recovery in 1991 having generated a flow increase in 1995 at {B}ossangoa as well as at {B}atangafo. {A}t the same time, {C}hari/{L}ogone at {N}djamena recorded critical discharges in both 1987 (313 m3/s) and 1990 (390 m3/s) before they increased, such as on the {O}uham. {T}hese results demonstrate the decline in water resources in the {O}uham {R}iver, and their direct impact on the water level of the {C}hari {R}iver and {L}ake {C}had in the targeted period.},
  keywords = {spatiotemporal variability ; hydrological regimes ; water resources ; {O}uham at {B}atangafo ; {B}ozoum ; {B}ossangoa ; {C}entral {A}frican {R}epublic ; {CENTRAFRICAINE} {REPUBLIQUE}},
  booktitle = {},
  journal = {{G}eosciences},
  volume = {13},
  numero = {11},
  pages = {334 [25 p.]},
  year = {2023},
  DOI = {10.3390/geosciences13110334},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088744},
}