2^)T = 1 - 51X1 ° 

 r o 



V-0.717 



2.38 



0.132-0.447 _c 

 ' o 50 V X 



+ 0.11 x 10 



-3 



(100) 



where 6 is the total depth of the D-profile (Figure 24). The variation of 

 the ratio W-/W over the D-profile determines the dimensionless form of the 

 D-profile. Swart determined the following equation for w -j/ w r : 



W. 

 i 



0.7 A + 1 + 3.97 x 10 7 b D^L a 1 - 36 * 10 n 



r 50 r 50 



(101) 



where 



h - 6 



2i _ the dimensionless position in the 



D-profile measured positively downward 

 from the still-water level 



(102) 



b = 1 for A > , i.e., below the still-water level 



r 



b = for A < , i.e., above the still-water level 



78. The transport rate (S ).,. (i refers to position on D-profile 

 and t to time) was found by Swart (1976) to be given by the following 

 equation 



S 



fit 



')i VtVi 



a 2i "" "V 



(103) 



where 



to 



= Hp exp 



,2.66 



H 0.78 x 0.9 D -1.29 o< 

 o o 50 \ h J 



- 0.079 



(104) 



(s ). 



y i 



(s ) 



y «. 



li 2i 



( y 2 - y i\ 



\ = 



w v. + <y-> - yi > 



bm 2 1 mo 



(y 2 - y^io 



w bi + (y 2 - y^io 



(y 2 " y l>io 



w. . + (y~ - y,). 



bi 2 1 10 



X. 



(105) 



(106) 



58 



