VI-154 



mpnt lies in their nH^ntabilitv o^ use to stuHv ^ i-nVp snectrur^ 

 of nrobler's. Sorp o^ the r^ost sinni-^icant are: ■'^InoHinn Hue to 

 hurricane surno«;; (^F-Ficienrv 6^ tiHal miyinn and the resultinn 

 salinity distributions; Hiffii<;ion, dispersion, and -Plushinn of 

 waste discharnps (sewane, chprr'ical, thernal, etr.) in bavs and 

 estuaries alono the coast; shoalinn and erosion in bavs, navioation 

 channels, coastal inlets, etc., dye to dpnosition o-^ dredninn 

 spoil, and river and coastal sediment povppients; irnroverent and 

 verification o-*^ de<;inps for navigation channels, estuarine coastal 

 structures, tidal inlets, ietties, etc. Thev nrovide a Tieans o-^ 

 deterpininn in advance the e'f^'^ects o-^ channel dpepenino, ipttv 

 extension and construction of ne''' ietties, the effects r^ land 

 fills and destruction o^ narts of tidal flats, and the pf-'^erts 



such nroiects would have on the total nhvsical picture of an 

 estuarv. 



''athepatical 'Models 



'''athepatical models have the advantaoo o-f renin' rinn little expen- 

 sive construction and maintenance, '''hev are basicallv expansions 

 of onuations o-^ state of various nhvsico-cherical phenomena in 

 a '''ater course. Thev theoreticallv should allow for proper 

 consideration o-*" all o-*^ the variahlps, when l^no'-'n. Simulation is 

 done throunh computer techninues and, hence, has the advantanp 

 of speed and flpxibilitv. The dra\•'bac^' in the application of these 



