Comparison of different overwash models in simulating tidal anomalies in lake conjola, NSW, Australia

Tóm tắt

     Lake Conjola in Southern, New South Wales, Australia experienced a significant flooding event around 9th April 2006 (Figure 2). We explain how the raised water level in the lake was caused by waves with large height and very long period pumping water into the lagoon across a berm separating the lagoon from the ocean. 
     The simulation considering lake system as two nodes in series is carried out using different overwash discharge Qover- formulae viz, the wave pumping model (Nielsen, 2001; Callaghan, 2006; Thuy et al, 2011), the swash model of Baldock (2007, 2010) and the empirical overtopping models (Van der Meer & Janssen, 1995; Hedges & Reis, 1998; Pullen et al, 2007). 
The results show that the wave pump model provides the lowest overwash flow rate while the group of three empirical models similarly gives highest discharge.       The simulated water levels using different overwash models show that the group of empirical models overestimates the water level. The wave pump model and the swash model are comparable and give good agreement with measured water levels. The wave pump model best performs with matching measured tidal range and lowest RMSE