River like everything else tend to move to a state of equilibrium or a state in which they use the least possible energy. In a straight line a river uses more energy than when it meanders. Meandering alows the slow it pace and as a result drop sediments. Thus this is the state in which it uses less energy.
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As a river curves to follow the terrain silt carried in the current is deposited on the inner edge of the curve because the current is slower.The fast current at the outer edge of the curve erodes the river bank and tends to widen the river at this point. Silt deposited on the inner curve section builds up to form a beach.The effect shifts the river very slowly in the direction of the eroded bank.Silt from the eroded bank travels on to be deposited at the next curve and so the river starts to meander.
named after the meander river in Turkey I think?
They have more because the slow water piles up and crashes finaly, creating a meander