DAMS IN THE FACE OF CLIMATE CHANGE!

B. REMINI

Abstract


Dams in the face of climate change is the title of the subject discussed in this article. Based on field work carried out over the last 20 years, it appears that these climate changes have indeed given rise to new behaviors on dams. For the first time in the history of Algerian hydrotechnical infrastructure, the water in the dam is drying up and all activities around the dam are stopping. Very harsh as a consequence ; this new parameter (drying up of the lake) is slowing down the development of aquaculture and therefore it is impossible to promote sustainable fishing in this area (dam) especially for small and medium dams. The dam can also fill up completely during a single flood. This can cause a landslide or pose a problem of stability of the structure. After a long drought of 6 to 7 months, torrential floods bring significant quantities of water to the dam but which are loaded with fine particles. Such a phenomenon causes the appearance of density currents which propagate below the clear water of the lake depositing sediments at the bottom of the dam. In both seasons (dry and wet), the dam loses a volume of water by evaporation and siltation. The dam must continue to play its role of storing flood waters and reusing them in periods of drought, but modifications to the structure must be made so that the dam adapts as well as possible to the new climate.


Keywords


Dam, Climate change, Lake drying, Rapid lake filling, Rapid siltation, Density current.

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References


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