河道上、中、下游景觀

河道上游

水流速度最快、坡度陡峭河道狹窄，岩塊較大有尖銳的角。

 

河道中游

水流速度中等、坡度中等河道中等寬度，石頭較小，形狀較圓。

 

 

河道下游

水流速度最慢、坡度平緩河道寬闊、都是細砂和碎石子。

圖片來源：
PERU. URUBAMBA RIVER BETWEEN CUZCO AND AGUAS CALIENTES. HEADWATER OF THE AMAZON RIVER. Photograph. Encyclopædia Britannica Image Quest. Web. 25 Sep 2011. http://quest.eb.com/media/image.htm?mediaId=148_1830881  
Salmon River. Photography. Encyclopædia Britannica Image Quest. Web. 25 Sep 2011. http://quest.eb.com/media/image.htm?mediaId=139_2003798  
Aerial Of Copper River Delta. Photography. Encyclopædia Britannica Image Quest. Web. 25 Sep 2011. http://quest.eb.com/media/image.htm?mediaId=131_1423034