چكيده به لاتين
Nowadays, simultaneous water quantity and quality management is one of the inevitable necessities of sustainable development. Continuous fluxes of multiple pollutants originate from various activities in Gol-Gol sub-basins lead to Ilam river-reservoir contamination. To avoid/reduce water quality deterioration in these large scale water system, Ilam river-reservoir water quality and quantity management is considered with two viewpoints in this research: (1) Deriving optimal drawing pattern from reservoir in selective withdrawal scheme aiming to decrease downstream water demand shortage and reservoir outflow dissolved oxygen violations (2) Deriving optimal drawing pattern from reservoir in selective withdrawal framework and multi-pollutant (nitrate, phosphate, iron, and BOD) load allocation aiming to decrease downstream water demand shortage, reduce PO4-P and Fe standard violations in two monitoring points in Ilam river, and improving water quality index of Ilam reservoir outflow which is aggregate index of qualitative parameters such as dissolved oxygen, nitrate, phosphate, Fe, and BOD in this research. The multi pollutants from Gol-Gol sub-basins discharged to Ilam river have been simulated as tributary of water system in 2D hydrodynamic and water quality simulation model, CE-QUAL-W2. Surrogated based simulation-optimization (SBSO) approach have been applied to tackle the computational burdens of CE-QUAL-W2 as numerical model. The performances of ANN and SVR as data-mining models in the prediction of water quality responses according to various management scenarios have been compared considering the computational time and precision criteria. The comparison results show SVR algorithm included in LIBSVM software is more timely efficient as surrogate model of CE-QUAL-W2. As a results, multi-objective particle swarm optimization (MOPSO) algorithm has been coupled to LIBSVM as surrogate of water quality simulation model. The results show more reservoir water releases to satisfy downstream water demands lead to better water quality conditions in reservoir outflow. According to scientific and conceptual reasons, the decreasing of water detention time in Ilam reservoir results in better quality conditions. Furthermore, multi-pollutant waste load allocations along Gol-Gol river lead to water quality enhancement in Ilam river-reservoir system.
