"abandoned rivers meanders" . "Meander cutoff" . "cut-off" . "Meander cutoff" . . "meander" . "shifting land form" . . "cut off" . "cutoff" . "cut-off meander spurs" . "meander cutoff" . "cutoffs" . "cutoff to shorten the course of the river" . . . "cut off due to erosion and silting" .