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Developments in Geotechnical Engineering, 23: Stability of Tidal Inlets: Theory and Engineering focuses on all aspects related to tidal inlets on littoral drift shores where freshwater flow is small or non-existing. The selection first tackles the development and configuration of tidal inlets and inlet hydraulics. Discussions focus on flow dynamics and nearshore transport, combinations of waves and currents, sediment transport and storage in the tidal entrance, offsets of tidal inlets, natural inlet regimen, migration of inlets, and origin of tidal inlets. The manuscript then examines sediment transport in tidal inlets, stability of tidal inlets on littoral drift shores, and design and improvements of coastal inlets. Topics cover ocean entrance, overall stability condition, hydraulic and sedimentary principles, non-scouring channels, transport of sediments in wave agitated waters, and sediment transport by combined wave and current action. The publication explores improvements by structures, including natural bypassing, types of improvement, and bypassing by structures and bypassing plants or arrangements. The selection is a valuable source of data for researchers interested in the stability of tidal inlets.
Along much of the shoreline of the world, tidal inlets play an important role in nearshore processes, providing links between the coastal oceans and protected embayments. Their study is of particular importance not only for the understanding of fundamental processes in coastal oceanography but also for engineering and the proper management of the delicate equilibrium of our shorelines. This volume, based on the International Symposium on Hydrodynamics and Sediment Dynamics of Tidal Inlets held at Woods Hole, MA, presents the reader with an overview of contemporary research on these important features. The coverage includes: - mathematical modelling, including a review of inlet hydrodynamics, - observations on hydrodynamics, - sedimentology and morphology, - tidal deltas, - processes and policies pertaining to sedimentation, and the - impacts of shore protection and dredging in beaches.
Various aspects of sediment transport in and around natural, unstructured tidal inlets were investigated over the two year period of study. Concentrating on two tidal inlets (Nauset Inlet and Popponesset Inlet, Cape Cod, MA), and combining detailed field observations with numerical model studies of tidal flows in inlet/estuarine environments, several aspects of tidal inlet behavior have been clarified. In addition, field work has resulted in a number of technical publications of general utility to a wide spectrum of coastal research interest. Primary scientific items addressed in this study include: 1) diagnostic numerical model of generation and propagation of tidal non-liniarities in shallow estuarine channels; 2) effects of flow curvature on tidal inlet sediment transport; 3) definition of mechanisms by which tidal inlets migrate in a direction opposite to the net littoral drift direction; 4) hypothesis of a mechanism for rapid barrier spit growth in locations with low rates of littoral transport; 5) clarification of long-term patterns of sea-level rise in the United States to assess its role in tidal inlet/esturarine evolution; 6) historical descriptions of massive inlet migration at two study inlets as supporting evidence for the inlet modeling studies. Technical information generated by the study includes a description of a low-cost, reliable method to join nearshore electrical cables; description and intercomparison of instrumentation and analysis routines for estimating directional spectral parameters from wave gage data; and development of a field system and laboratory analysis package for preparing accurate bathymetric charts in shallow, nearshore regions, using microwave navigation and precision echo-sounding.