As climate change continues to impact our planet, a better understanding of the Earth’s water cycle and its related processes becomes increasingly necessary. Global Hydrological Models (GHMs) have emerged as a crucial tool to analyze complex, large-scale hydrological systems and predict the availability, distribution, and movement of water resources across the world.
GHMs look at hydrology from the perspective of the earth behaving as one interconnected system, rather than as separate catchments. They integrate global data on precipitation, evaporation, infiltration, soil moisture, streamflow, and human water use in a comprehensive simulation. These models are indispensable for numerous applications, from predicting potential flood and drought situations to devising water resource management strategies, and even working towards creating climate-resilient societies.
The continuous advancements in computation capabilities, satellite-based remote sensing technologies, and data assimilation techniques further enhance the performance and accuracy of GHMs. DHI’s GHM uses a combination of over 1 million catchment runoff models to represent almost the whole world on a 10x10km grid. The models are running operationally and are updated hourly, harvesting global datasets including live Earth Observation data. They also produce medium range forecasts up to 15 days, and seasonal forecasts up to 6 months. The models produce parameters such as runoff, groundwater baseflow, and root zone storage, as well as natural flow river discharges.
With DHI’s GHM, you can:
UNEP-DHI’s projects that used DHI’s GHM:
Learn more about GHMs:
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