engleski

Origin, Duration and Reclamation of Natural Dams

The natural dams arise on natural way in the water stream when the barrier turns up in the watercourse. That is possible on different way. It existed two main groups of dams arise. The first is when mud stream stops in the watercourse ant the other is when landslide baffles a graben of the torrent. This phenomenon is a part of the permanent natural, gradual, forming of the landscape surface caused by gravity. The difference between mud flow and landslide is substantial, but both of them belong to natural disaster. The appearance of this natural phenomenon in populated area brought catastrophe in human and economic sense. The hydrological events caused both of them ; the intensive or long-standing rainfall or the suddenly snow melting. The other cause of this phenomenon’ s is earthquake and volcano eruption. The rain change surface conditions (surface erosion) and conditions in watercourse. The water deeps a graben and saps the banks, toe of slopes. The precipitations change the underground water level and underground water flow so causes often slope instability and landslides. The worse are when this is accompanying with snow melting.

natural damm; duration; reclamation; landslide; mudflow

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