| Autor: |
Bi Tié Albert Goula, Issiaka Savane, Brou Konan, Vamoryba Fadika, Gnamien Béatrice Kouadio |
| Jazyk: |
francouzština |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
VertigO, Vol 7, Iss 1 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
1492-8442 |
| DOI: |
10.4000/vertigo.2038 |
| Popis: |
This study aims to show the impact of climate variability on water resources of N’zo and N’zi watersheds. The reduced centered index shows a great interannual variability of rainfall which is organized alternately in a wet phase (1930-1966 for the N’zo and of 1930-1968 for the N’zi), a dry phase (1967 –1993 for the N’zo and 1969-2000 for the N’zi) and a new humid phase of 1994 to 2000 only for N’zo. The long rainfall deficit caused a more significant decrease of runoff on the N’zi from 1968 to 2004 (-49%) than N’zo of 1970 to 1993 (-27%). Moreover, the interannual fluctuation of rainfalls and runoffs is accompanied by stationnarity breaks in their series. Hubert procedure of segmentation reveals for rainfalls some breaks in 1966-67 and 1993-94 for N’zo and in 1968-69 the N’zi. Runoffs are affected by ruptures in 1980-81 and 1993-94 for N’zo and in 1968-69 for N’zi. Since 1994, runoff on the basin of the N’zo becomes surplus (+60% of 1994 to 2004) with rainfalls (+18% of 1994 to 2000) and one observes a faster groundwater recharge thanks to the depletion coefficient. On the other hand over N’zi watershed, rainfalls and runoffs remain still overdrawn and groundwater are not very sensitive to rainfalls variation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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