Development of optimal operational policies for largescale reservoir systems is often complicated by a multiplicity of conflicting project uses and purposes. A wide range of multiobjective optimization methods are available for appraising tradeoffs between conificting objectives. The purpose of this study is to provide guidance as to those methods which are best suited to dealing with the challenging large-scale, nonlinear, dynamic, and stochastic characteristics of multireservoir system operations. As a case study, the selected methodologies are applied to the Han River Reservoir System in Korea for four principal project objectives: water supply and low flow augmentation; annual hydropower production, reliable energy generation, and minimization of risk of violating firm water supply requirements. Additional objectives such as flood control are also considered, but are imposed as fixed constraints. (KEY TERMS: multiobjective optimization; reservoir operation; multipurpose reservoirs; mathematical programming; dynamic programming; hydropower.) 'Paper No.The objective of this study is to assess the applicability of available methods in multiobjective optimization for reservoir system operational problems, and synthesize the most relevant techniques into a decision-guidance procedure for reservoir system operators. The goal is to achieve computational efficiency without requiring excessive involvement of the reservoir system operator. The selected techniques must be adaptable to the large-scale, nonlinear, dynamic and stochastic characteristics of reservoir system operational problems. The selected algorithms are then applied to the Han River Reservoir System in South Korea as a case study. The first author is Vice Director of the Water Resources Research Institute of the Korea Water Resources Corporation (KOWACO), which is responsible for reservoir system operations in all the major river basins of South Korea, and is therefore qualified to represent the decision maker (i.e., reservoir system operator) in this study. FORMULATION OF RESERVOIR SYSTEM OPERATIONAL PROBLEMThe multiobjective optimization problem for reservoir system operations can be formulated as follows: max[F1,F2,... ,Fm] subject to = V + I + SQ --E(V,V+1)

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