INTEGRATED RIVER BASIN OPERATIONAL PLANNING CONSIDERING WATER QUANTITY AND WATER QUALITY (WATER DISCHARGES, RESERVOIR)

This research presents a comprehensive methodology that improves current approaches for integrated water quantity and quality analysis focused on answering two fundamental questions for basin water management problems: (1) How much water should be released from each upstream reservoir, at each time period, to meet downstream water quality objectives while simultaneously maximizing achievement of water quantity objectives? (2) To what degree should the waste discharges, for the areas between the headwater storages and the downstream water quality control point, be treated based on the optimal waste load allocation (WLA) strategies?;In order to answer the first question, a basin-wide, multipurpose, multi-reservoir system optimization model, H3DP, which simultaneously considers the downstream river water quality objectives has been developed based on the Incremental Dynamic Programming (IDP) algorithm. The QUAL2E model was utilized to initially develop a basin stream water quality prediction model and, then, to develop a water quality computation subroutine at the downstream target control point as function of headwater releases. The developed subroutine, QUAL, is a component of the water quantity and quality module, incorporated into the river-reservoir system operation module.;In order to answer the second question, an optimal WLA module has been developed using the Linear Programming algorithm. This regional WLA planning module is interactively linked and operated with the integrated river-reservoir system module and the basin water quality prediction module within the scope of an advanced decision support system.;A case study was used to demonstrate the potential value of a DSS for water resources and water quality planning in the Han river basin, Korea. The results of the application reveal the practical possibility of deriving optimal integrated multi-reservoir system operational strategies which simultaneously consider downstream water quality control. The users can analyze the interactive combination between streamflow regulation through optimal basin reservoir system operation and cost-effective, regional waste treatment planning in order to meet the needs for specified basin water planning and operational objectives.