ABSTRACT
The Texas Water Development Board (TWBD) has made particularly extensive application of this approach in establishing freshwater inflow requirements, as a part of its Bays and Estuaries Program. The most general formulation of the problem, however, should accommodate not only seasonal variation in salinity limits of the organisms but also seasonal variation in upstream water demands and the specific time response of salinity to freshwater inflow. This chapter develops a general methodology for the estuarine freshwater resources management, so that for discussion purposes, the hydrodynamic transport model needed for simulation of temporal and spatial variation of salinity is not restricted to a particular model. The independent (decision) variables are the monthly averaged freshwater inflows from each river connected to the bay system. The hydrodynamic model (HYD) is developed for vertically well-mixed estuaries to solve the two-dimensional dynamic equations of motion and the unsteady continuity equation.
