Offshore Sink 



4. Longshore Tronsporf 

 Qa ■ 



IN 



WATER 



I Longshore Transport 



*- Q4 



r r 



Sediment Budget Boundary 



Top of Cliff 



LAND 



ERODING SHORELINE-PLAN VIEW 



(Not to Scole) 



Budget Boundory 



ri Recession 



Seoword Limit of 

 Active Erosion 



SECTION A-A 



(Not to Scale) 



Assumptions 



Budget Calculations 



Q4 = 100,000 yd.Vyr. 



q+ = 1 yd?/yr./U. 



q~ = 0.5yd.Vyr./{l. 



b = 10,000 ft. 



Sum of Sources — Sum of Sinks = Difference 



Find Q: 



(q; +q^b)-(Q;+q;b) = o 



(10^ + 1.0 X 10"*) - (Q~ + 0.5 X lO'*) = o 



Q^ = 110,000-5,000 



Q^ = 105,000 yd.Vyr. 

 Figure 4-43. Basic Example of Sediment Budget 



4-120 



