Please proofread and polish the following text from an academic perspective to make it more logical focused and informative：The calculation of MIKE21 water treatment model can be divided into three pa

The MIKE21 water treatment model comprises three distinct components: the hydrodynamic model (HD), the water quality model (Ecolab), and the sediment model (ST). These components work in tandem to simulate the various aspects of water treatment. The simulation process for the MIKE21 model is depicted in Figure 4.

The HD component of the model is designed to simulate the movement of water and its associated properties, such as velocity and direction. It takes into account the effects of tides, waves, and currents, and allows for the prediction of changes in water levels and flow rates.

The Ecolab component of the model is responsible for simulating water quality parameters, such as dissolved oxygen, nutrients, and pollutants. It also allows for the prediction of the impact of various water treatment strategies, such as the use of artificial aeration or the introduction of chemicals.

The ST component of the model is used to simulate the behavior of sediments in the water, including their transport and deposition. This component is particularly useful for predicting the impact of dredging and other sediment removal activities.

Overall, the MIKE21 water treatment model is a comprehensive tool for simulating the various aspects of water treatment. Its three distinct components work together to provide a detailed understanding of the complex processes involved in water treatment, allowing for the development of effective strategies for managing and preserving our water resources.