1. FLUVIAL PROCESSES AND LANDFORMS Unit six The Dynamics of Earth’s environment presentation by: S.T GIS postgraduate program (BDU) Email: stsolt82@gmail.com

6. splash erosion Cont…

8. Sheet Erosion

10. Rill Erosion

13. · Forms erosion on an exposed slope

15. The world’s longest rivers Cont’d River name Continent Total length Nile Africa 6695 Km Amazon South America 6400 Km Yangtze Asia 6300 Km Mississippi-Missouri-Red Rock North America 5970 Km Yeisey-Angara Asia 5550 Km Yellow River Asia 5464 Km Ob’-Irtysh Asia 5410 Km Rio Parana-ril grande South America 4500 Km Amur-shilka Asia 4416 Km Lena Asia 4400 Km Congo Africa 4374 Km Mackenzie-Peace-Finlay North America 4241 Km Mekong Asia 4200 Km Niger Africa 4180 Km

17. Sources of Stream Flow Cont’d

20. Mississippi river basin Cont’d

21. North America drainage system Continental divide Cont’d

23. Superposed Streams Development of water gap Folded Units Cont’d

33. Cont’d

40. Braided Streams Cont’d

47. Cont’d

52. Stream Gradient Cont’d

54. Roughness of the channel

55. Cont’d Channel shape

59. Cont’d

62. Cont’d An example of suspension

68. Cont’d

73. Young Stage -Has steep-sided and narrow V-shaped valley created by vertical erosion -characterized by waterfalls and rapids. -Water is often quite clear because the river is not carrying much load in suspension. -Velocity is high. -Down cutting and head ward erosion are the major processes of river erosion. and head ward erosion is dominant

79. Cont’d - Cap Rock - layer of hard resistant rock forming the 'step' over which the 'falls' occur in a waterfall.

80. Water fall Tis Isat” (Blue Nile) Waterfall Cont’d

82. Potholes Cont’d

84. Interlocking Spurs River channel Cont’d

88. Cont’d

89. Cont’d

96. Cont’d

99. Deposition and Erosion of River Bars Flood: Increased discharge and erosion! Normal Flow Post-flood; new bars deposited

101. Flood plain Cont’d Bluff

104. Land forms produced by river Cont’d

106. Stream Terrace

107. Stream terraces

111. Arcuate Delta

113. Bird’s foot Delta

115. Cuspate Delta Tiber River delta of Italy

117. Estuarine Delta

119. Alluvial fans

122. THE END THANK YOU