Water velocity data from acoustic Doppler current proe lers and electromagnetic current meters deployed at six separate locations across the entrance of the Chesapeake Bay from mid-April to early July of 1999 and from early September to mid-November of 1999 were used in conjunction with wind velocity and sea level records to describe the characteristics of the wind-induced subtidal volume exchange between the bay and the adjacent continental shelf. The current measurements were used to estimate volume e uxes associated with the local and remote wind-induced bay-shelf exchange over time scales of 2‐ 3 days. The results show that at these relatively short subtidal time scales (1) the net e ux integrated over the entrance to the estuary adequately describes the unidirectional (either ine ow or oute ow over the entire cross-section) barotropic volume e ux associated with the coastally forced remote wind effect, (2) during the e rst deployment there is always a bi-directional exchange pattern (ine ow and oute ow existing simultaneously over different parts of the cross-section) superimposed on the sectionally integrated unidirectional exchange, (3) the magnitude of the bi-directional transport associated with the local wind effect may be a signie cant fraction of the unidirectional transport associated with the remote wind effect, and (4) the relative importance of the local wind effect in producing estuary-shelf exchange changes appreciably with season, depending on the characteristic frequency of the wind events and the degree of stratie cation in the estuary.
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Wong et al. (2002) studied this question.