200 250 200 150 150 100 100 50 50 0 500 0 500 1000 1500 0 500 1000 1500 2000 2500 50 (a) S34 5.6 (b) S113 160.1 1000 300 800 1300 240 220 356 200 180 1 17 160 140 120 100 200 (c) S205 THE CHANGJIANG RIVER 17