river bed gradient 中文意思是什麼
river bed gradient
解釋
河床比降-
There is sharp gradient in top and small gradient in bottom. the ability of removing flood is high in top and it is small in bottom correspondingly. sediment silt up continually, so the bed of river is jacked up year by year and become the famous river on land
由於泥沙含量高,現行河道已行水140餘年,山東段河床上寬下窄,坡度上陡下緩,排洪能力上大下小,在泥沙淤積作用下,河床逐年抬高,成為世界上著名的地上「懸河」 。
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