A STUDY TO SUPPORT WATER RESOURCES IN CHINA THROUGH ADVANCED WATER MANAGEMENT USING HYDRODYNAMIC MODELLING.

Abstract

The water quality of Nam Theun 2 Reservoir was forecasted for the medium term using a three-dimensional water quality model, and several scenarios were evaluated using this model. The model was successful in accomplishing both of its purposes. It is projected that the water column oxygen will increase fifteen years from now, despite the fact that certain areas of the reservoir will have hypolimnion that is devoid of oxygen. Compounds that are hazardous to the environment will disappear with time. Two cases using changing natural or human-induced forces illustrate the importance of hydrodynamics in the development of water quality in this article. Reservoir water quality is greatly affected by the length of time that critical hydro meteorological phenomena like rainfall, floods, and decreases in air temperature last throughout the year. Differences in hydro meteorological conditions are reflected in models from a variety of years. That the duration of these episodes has an effect on water quality is demonstrated by this. It was determined through calculations that the physicochemical composition of the water further downstream would have been different if the power plant had begun operations immediately after the impoundment began. Alterations in land use have also been used to investigate the consequences of growing levels of NO₃⁻ and PO₄⁻³ in the watershed, which was done with the help of the model. The competition between various water-use techniques is illustrated by a single currency. Using this method, in order to achieve a single objective, complex management difficulties are broken down into manageable challenges. The costs and benefits of various water-use practices may be evaluated more easily as a result of this.