4)明猥揆底披分 WHU ①正坡( Falling slope)j>O,底坡高程沿程下降, 21>2 ②平坡( Horizontal slope)i=0,底坡高程沿程不变 ⑦反坡( Adverse slope)j<O,底坡高程沿程抬高, 2≤2 考mmmm =0 i<0WHU 4)明渠按底坡分类 ①正坡(Falling slope)i>0,底坡高程沿程下降, z1>z2 ②平坡(Horizontal slope) i=0 ,底坡高程沿程不变 z1=z2 ③反坡(Adverse slope) i<0 ,底坡高程沿程抬高, z1<z2