Figures index

From

Study of the Dynamics of Quaternary Aquifers by Infiltration of Rainwater and/or Lake Chad

BADA Ali Malloum, MALOU Raymond, KODI Mahamat Mbâm, SOUK Allag Waayna

American Journal of Water Resources. 2017, 5(2), 41-53 doi:10.12691/ajwr-5-2-3
  • Figure 1. Water level sensor
  • Figure 2. Field GPS
  • Figure 3. Boreholes used for water level measurements
  • Figure 4. Level measurement steps by a probe in the field
  • Figure 5. One of the limnometric scales installed in Bol (northeast of Lake Chad)
  • Figure 6. Schematic map showing the two distinct basins of Lake Chad in the southern basin (the observation sites of the measurements: Bol, Baga-sola, Guitte and Dandi) and the northern basin separated by the great barrier line Baga kawa - Baga Sola over a width of 40 km [5]
  • Figure 7. Full-month water levels at Bol in the months of January 2013 and January 2015 (SODELAC et al., 2015)
  • Figure 8. Changes in the level of streams in the tributaries of Lake Chad in 2012, which experienced a river flood compared to the year 2014: a) Barh Sara station in Manda (Chari), B) Logone station in Moundou (Logone) (LaCBO 2014)
  • Figure 9. Daily variations of four months of the level observed at Bol of the year 2013. The altitude of the zero of the scale is at 275.5 meters
  • Figure 10. Daily variations of four months of the level observed at Bol of the year 2015. The altitude of the zero of the scale is at 275.5 meters
  • Figure 11. Spatio-temporal and inter-annual variation of the free water table in the study area (A: 2013, B: 2014, C: 2015, D: 2016)
  • Figure 12. open water tables dynamics of the study area over a year: January, May, August and November on the different measurement sites (F1: Bol, F10: Baga-sola, F13: Dandi and F17: Guittè)
  • Figure 13. open water table dynamics of the study area of the same month over four years (A: January (F2: 013-2016), B: May (F9: 2013-2016), C: August (F12: 2013-2016) D: November (F18: 2013-2016))
  • Figure 14. open water table dynamics of the study area from 2013 to 2016 of the observation sites: (A: Bol), (B: Baga-sola), (C: Dandi) and (D: Guittè)
  • Figure 15. Litho-stratigraphic column observed at Baga-sola
  • Figure 16. Litho-stratigraphic column observed at Bol
  • Figure 17. Litho-stratigraphic column observed at Dandi and Guitté
  • Figure 18. Alimentation of the free water table by the lake