Study Of Estuary Entrances Through One Dimensional Modelling

This paper investigates the use of a one dimensional hydrodynamic model, Dynlet in analyzing rivers that are highly mobile and prone to closure. Wairoa river, located in Hawkes Bay, New Zealand has a gravel barrier beach seperating the estuary from the sea and is often closed or near closed during low flow events. The river has to be dredged regularly to prevent flooding and as such, it is of interest to the research to study the behavior of the entrance. A one dimensional model has been created using data provided by Hawkes Bay regional council and from the model, a method is proposed allowing for the prediction of entrance dimensions. In addition, the equilibrium flow area of the river is used as a comparison with other researchers in this field.