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(1982). NUMERICAL ANALYSIS OF THE TETON DAM FAILURE FLOOD. Journal of Hydraulic Research: Vol. 20, No. 4, pp. 317-328.

TWO procedures were developed to simulate salinity intrusion in the Mississippi River. The first one is based on the arrested salinity wedge theory and is applicable to quasi‐steady‐state flow conditions. It simulated very well the experimental results of Keulegan. It also simulated the positions of salt wedge tips and their interfaces in the Mississippi River with proper adjustment of the interfacial friction factor. The second one is a steady‐dynamic routing model, which routes salt water in a cascade of reservoirs in the river bottom. Densimetric critical flow is assumed over a reservoir ridge. Error in storage definition is included in a calibration coefficient for the saltwater flow computations over the reservoir ridges. The model satisfactorily simulated durations of salt wedge presence along the lower Mississippi for the existing conditions and after deepening the channel to 55 ft.

Numerical analyses made with the use of Program FAT, previously developed in collaboration by the senior writer, with the Program LATIS, on the propagation of the transient flow subsequent to a dam failure, are presented. The main difference between the new and old programs consists in the formulation of the continuity equation, which in Program LATIS is written for the node instead of the link. This allows the analysis of more complex networks, presently under study. The hypothetical gradual collapse of the cofferdam of the Bou Regreg Dam in Morocco was studied to assist in the preparation of emergency plans. These results are compared to those of an instantaneous collapse of the same project and of a dam in a rectangular channel.

A joint probability analysis of storm tides is made for the Battery, New York (U.S.A.), and Newark Bay, New Jersey (U.S.A.). Storm tides are caused by either low-pressure coastal storms (northeasters) or hurricanes. The analysis uses existing gage data at the Battery to construct frequency/probability curves of peak surge elevations and tidal amplitudes. These are used in a computer program to combine standard storm surge stages and tidal stage curves to produce an artificial storm tide with given peak elevation and incremental frequency. These peak elevations and incremental frequencies are ranked to produce cumulative frequency curves for northeasters and hurricanes. A frequency curve is obtained for Newark Bay via correlation.

A numerical model is developed to predict the shoreline changes at Nome, Alaska due to the construction of a causeway that will connect the offshore port terminal with the onshore facilities. The model is based on a procedure developed earlier by other researchers. Several aspects of the original procedure are elaborated and modified. The resultant model was verified by simulating the present beach condition near the entrance jetties of Nome Harbor. Using the same parameters, the model was applied to the causeway and shore configurations for a 30‐yr period were predicted. These applications show that the modifications made on the original model are promising. The model can be applied to other similar situations provided the parameters are calibrated by simulating existing conditions.

Investigations made to define a suitable protection against hurricane surge floods in Jamaica Bay involved the study of astronomic and hurricane tides, and their propagation in the system, both under present conditions and as would be modified after the protective works are built. Mathematical models were sent for different cases and solutions obtained by means of an electronic computer. A generic model is presented for a network of channels subject to a sinusoidal tide excitation. An application of this procedure to the tidal regime in the Jamaica Bay showed that the model could be calibrated to a satisfactory degree of accuracy.