HYDROLOGICAL TRENDS IN SMALL WATERSHEDS IN THE FOUTA DJALLON HIGHLANDS Thomas Hofer, FAO / MPS, 3.12.2012 Research work: Veerle Verschoren.

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Presentation transcript:

HYDROLOGICAL TRENDS IN SMALL WATERSHEDS IN THE FOUTA DJALLON HIGHLANDS Thomas Hofer, FAO / MPS, Research work: Veerle Verschoren

Fouta Djallon entre Pita et Dalaba (photo Marketta Juppi)

Introduction S TUDY AREA : F OUTA D JALLON H IGHLANDS (FDH) Shifting cultivation! Water tower of West-Africa, High precipitation gradient ( 2000 mm SW) F IELD OBSERVATIONS Increased seasonal dry out of small rivers, disappearance of springs Faster drain during the rainy season R ESEARCH Many natural and human induced influencing factors Limited data  Focus on small watersheds

Annual precipitation  High inter-annual variation  Drastic decline after 1970  Before 1970: 1975 mm  After 1970: 1719 mm → Decrease of 13%  Reduction in rainfall in every month except July  The rainy season is shorter  Lower peak values in the rainy season, which mainly contribute to the discharge Data derived from Global Surface Summary of the Day, National Climate data centre.

Annual discharge No long term data series of discharge are available.  Similar as the precipitation, a change around 1970  Before 1970: 1287 mm  After 1970: 1065 mm → Decrease of 17% Data derived from Governmental Hydrological Service Guinea Red: Calculated discharges Green: Calculated and measured discharges Blue: Measured discharges

Annual trends  No long term trends in precipitation and in discharge.  The annual variation of discharge can only be partly explained by the variation in precipitation, the influence of land use in unclear.

Dry season Discharge of the dry season (Jan-May) Annual precipitation of the year before  The dry season discharge (Jan.-May) decreased exponentially.  No link between the precipitation and the discharge is found.

Take home messages (I)  A strong reduction in annual precipitation took place around 1970 (-13%), which resulted in a discharge decrease of 17% after  In the period no significant trends are found in the annual precipitation and in the annual discharge.  The discharge during the dry season declined between , the explanations are currently unknown.  The frequency of complete dry out of the river started and increased after 1970.

Take home messages (II)  Difficult to differentiate between climate variability and climate change  Hydrological trends: result of climate change or land use patterns / intensification?  Differentiated mountain terrain: difficult to identify overarching trends

Photo Marketta Juppi) Thank you for your attention!