Migration and cutoff formation of meanders in a hyper-arid environment: A case study from the Tarim River, Northwestern China
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Meandering channel has developed in the middle and lower Tarim River, the longest inland river flowing through a hyper-arid environment in western China. Planform features, lateral migration rate, and cutoffs of 105 typical meanders were analyzed using multi-period remote sensing images and field survey. The ratio of the channel centerline length to the neck width of meanders in the Tarim River ranges between 1.2 and 8.1, and the bend curvature (ratio of bend radius to channel width) ranges between 0.30-2.8, and the average deflection angle of the bend apexes is 79.9 degrees. The migration rates of the meanders range from 1.4 to 96.7 m/yr. In 2000-2013, 45 cutoffs occurred along the 400 km-long reach. Our preliminary studies will make for understanding meander formation and cutoff occurrence in the Tarim River.
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