Reproduction of hydrological phenomena

The concept, that the water cycle is a closed system, is the simplification of the real processes in the nature. The hydrologic cycle is made up of many different factors. As a result, it can become quite complicated when trying to analyse the relationships between those factors. Figure 1 schematically illustrates various directions of water movement in atmosphere and soil. A complete mathematical description of the hydrological processes is one of the most difficult tasks in engineering and natural sciences and has not been completely solved yet. It comprises the setting up of a integral model system, in which the components such as global climate model, surface runoff model and groundwater model of saturated and unsaturated soil layers are coupled together.

Considering the fact, that in each of those model components, there are still unexplained physical processes and lots of natural processes are the small-scale ones, this simplification of the hydrologic cycle becomes reasonable.

Mathematical models describe the water cycle considering the most important or relevant physical processes in the nature. The processes over the see surface sometimes are not considered. Furthermore, processes like vapour advection or condensation are also excluded. Those phenomena are meteorological and their simulation in Hydrology is not of great importance.

Important for the simulation is the temporal and plane distribution of the precipitation over the surface. This information is provided by the weather service or any other meteorological institution.

Finally, considering those modifications and simplification of the real system, one can distinguish the processes relevant for the simulation in hydrology described in figure 2.

Hydrological phenomena

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Module
Hydrological modelling
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TUHH

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