Accession Number : AD0782804

Title :   Unsteady Salinity Intrusion in Estuaries. Part I. One-Dimensional, Transient Salinity Intrusion with Varying Freshwater Inflow. Part II. Two-Dimensional Analysis of Time-Averaged Salinity and Velocity Profiles.

Descriptive Note : Final rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RALPH M PARSONS LAB FOR WATER RESOURCES AND HYDRODYNAMICS

Personal Author(s) : Harleman,Donald R. F. ; Fisher,John J. ; Thatcher,M. Llewellyn

Report Date : JUL 1974

Pagination or Media Count : 45

Abstract : The study reported herein is concerned with transient salinity intrusion and is presented in two parts. In Part I a one-dimensional numerical model is developed for the prediction of transient salinity intrusion under conditions of varying freshwater inflow. The model couples the one-dimensional continuity and momentum equation for unsteady tidal motion in a variable area estuary with the mass transport equation for salinity. The numerical model incorporates variable estuary geometry and roughness, time-dependent boundary conditions of tidal range at the ocean end, and variable freshwater inflow at the head of the estuary and from tributaries along the estuary. In Part II a two-dimensional analytical model is developed for the prediction of vertical distributions of velocity and salinity, averaged over a tidal period. The results of the numerical model described in Part I are used to determine the longitudinal salinity gradient which, for partially and well-mixed estuaries, is assumed to be independent of depth. (Modified author abstract)

Descriptors :   *Estuaries, *Salinity, *Fluid flow, Mathematical models, Ocean tides, Fresh water, Mixing, Salt water, Equations of motion, Equations of state, Density, Correlation techniques

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE