Both tides and winds will contribute to sea-level et al. 2008). Both tides and winds will contribute to sea-level fluctuations within estuaries (Zhong et al. 2008). These factors, along with increased evaporation within estuaries and altered freshwater-flow regimes, make it difficult to determine whether changes in sea level as a result of climate change have occurred in individual estuaries (see also Lough et al. 2011).