Design Prob lem_ Longshore Trondport 



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7/ 6 of / 33 1 

 21 Mania 



Longshore Sand Transport (cont.) 



h 



Q^ = 



(^-&)lfs-p-)9 



Inhere, g^ acceleration due to gravity 

 P~ porosity of sand m place (%) 

 /^= sedimenf density 

 P^= NQter density 



Assume, F-4o% and the specific gravity 

 of sand^ -^ = ^- <^5, 



^5= z.asff^ 



where 



Pf,^- density of fresh Noter 

 pfyv^ /.9^ slugs /ft^ 



Therefore, 



Ps = Z.tiS (/.?4) ^ 5.14 slugs /fi^ 

 also, pw = Z.O slugs /ft^ (soli tvater) 



Qjf:)- 



(t-^)(5M.2.0)(32.2) 



WO 



Therefore, 



or 



Q.&> 



k pJMb) 



Go.G'^/ff^ ^ff-y^ 



U.17 



8-116 



