Stability relationships for New Zealand's barrier enclosed tidal inlets 

Hume, T. M. 

1991 

 

 

Report 

This study has provided a fundamental understanding of the sediment and hydraulic regime at New Zealand's tidal inlets. It has identified the key factors controlling inlet processes as being tidal currents and geological control exerted on inlet stability by rock headlands. The empirical models developed in this study provide a means of making preliminary estimates of the effects on the tidal flow characteristics (tidal discharge and prism) of changes in channel profile shape (cross section area) by dredging in the inlet throat. They also provide a means of estimating the effects of reclamations and dredging on tidal inlets and estuaries, and thereby the opportunity to minimise changes in tidal flow regime and flushing. We are, therefore, in a better position to analyse the effects of natural events such as storms and rising sea level, as well as anthropogenic phenomena like sand mining and jetty construction, in a qualitative/semiqualitative way. Predictions must be made with caution, however. (auth) 

 

flushing; estuaries; dredging; mining; new zealand; tidal flow; Kaipara harbour; reclamation; storms; mathematical models; headlands; Biogeophysical; tidal currents; tidal inlets; barriers; sands; stability; channels; sea level changes; prisms; construction