ABSTRACT
StratiŸedžowsofthistypeoccurinavarietyofsituations intheenvironment.›eymayoccurinriverswherelowerlevel žuidismoredense(colderorsaltier)thanupperlevels,inestuarieswhereriveržowencounterstheocean,inlongstratiŸed lakeswherewind-drivenseichesoccur,inshallowstraitsand channelsintheoceansuchasatGibraltarandtheBosphorus, andindeepoceanchannelsthatcontrolthežowofbottom waters.InsomecasessuchasatGibraltarandtheBosphorus, thežowmaybeapproximatedbytwohomogeneouslayersthat žowinoppositedirections.›eseareknownasexchange ¡ows. ›isapproximationmayalsogiveausefuldescriptionofthe exchangežowthroughopendoorwaysandwindowsthatseparate two air masses with di§erent temperatures.
