The objective of this thesis is to show that by separating the two major anthropogenic changes caused in riverine input to the north shore of the Black Sea, it is possible to describe distinct linkages between ongoing ecological changes in the Black Sea, and 1) flow reduction, and 2) nutrient load increase. An attempt is made to quantify the pertinent changes in the inputs of water, salt, and nutrients by modelling individual fluxes over time. The results of these computations are used to argue how the ecology of the Black Sea may be realistically partially restored to something like its former productivity. The origins of input changes to this system are evaluated in terms of their sources. The economic and social costs that will be involved in altering the quality and quantity of those inputs to allow recovery of the Black Sea are examined along with the benefits that may accrue through the restoration of water quality, fisheries and tourism. Mechanisms that may be relevant in the process of achieving the alteration of the inputs are discussed. / Graduation date: 1996