ABSTRACT 



Open-coast storm-surge computations are of value in planning 

 and constructing engineering works in coastal regions. A quasi-two- 

 dimensional numerical model for such computations is discussed from the 

 standpoint of the model's underlying assumptions, range of validity, 

 calibration, and application. When using simple numerical schemes 

 of this sort, it is possible to make computations manually, although 

 electronic digital calculations are generally preferred. 



Elementary aspects of hurricanes and the physical factors govern- 

 ing storm generation processes are discussed. To display the principle 

 characteristics of the model from a physical as well as a mathematical 

 point of view, the basic hydrodynamic equations are given, together with 

 the assumptions generally taken in their development. The equations 

 consistent with the model described here are reduced forms of the basic 

 equations in which several terms have been neglected. These omissions 

 are indicated, and their effects on the resulting numerical scheme are 

 discussed. 



The use of design hurricanes for engineering studies is treated. 

 Effects of astronomical tide, initial water level, and atmospheric- 

 pressure setup are considered. 



An open-coast storm-surge problem is solved for the Chesapeake Bay 

 Entrance near Norfolk, Virginia. Calculations are made both by computer 

 and manually. The computer program used is listed. 



FOREWORD 



This report is published to provide a simplified method for compu- 

 tations of open-coast storm-surge to be used by engineers as a basis for 

 construction of protective coastal works. Examples of electronic digital 

 and manual calculations were used to arrive at computations based on a 

 quasi-two-dimensional numerical model. 



This report was prepared by B. R. Bodine, an engineer with the 

 Coastal Engineering Research Center, under the general supervision 

 of George M. Watts, Chief, Engineering Development Division and 

 R. A. Jachowski , Chief, Design Branch. 



At the time of publication. Lieutenant Colonel Edward M. Willis 

 was Director of CERC; Thorndike Saville, Jr. was Technical Director. 



NOTE: Comments on this publication are invited. Discussion will be 

 published in the next issue of the CERC Bulletin. 



This report is published under authority of Public Law 166, 79th 

 Congress, approved July 31, 1945, as supplemented by Public Law 172, 

 88th Congress, approved November 7, 1963. 



