HYPE in Sweden: S-HYPE

HYdrological Predictions for the Environment - Sweden

In accordance with the EU Water Framework Directive the Swedish water authorities focus on characterization of water bodies and establishing action plans to achieve good ecological status.

SMHI has therefore been commissioned to make freely available databases of hydrography, statistics, discharge (both observed and simulated) and scenario modelling tools.

All this is now available in the SMHI VattenWeb (Swedish) and in the (Swedish) information is added about news and background materials .

Vattenwebb delområde
Figure 1. SMHI Vattenweb provides information on a variety of hydrological variables, which can be downloaded along with other model information. Here the chosen subbasin flows towards the northwest into Lake Roxen while the contributing upstream area is shown in light blue. Enlarge Image

S-HYPE from the beginning

The idea to develop a new hydrological model at SMHI began back in 2003 and two years later, 2005, most of the model development started resulting in a first version of the HYPE model in 2008.

The first set up of the HYPE model for the whole of Sweden, based on the division of the country into water bodies according to the EU Water Framework Directive, was developed in 2009. The division that existed in SVAR (Swedish Water Archive) consisted of 17313 subbasins, which covered the whole of Sweden and parts of Norway and Finland (mainly Trysilelva and Torne River).

This HYPE model system for Sweden was called S-HYPE.

S-HYPE is constantly developing

The hydrological research unit contributes continuously to develop S-HYPE both concerning the subbasin divisions (based on SVAR), updates of inputs, improvements in process descriptions and calibration of the model.

The principle in the further development of the S-HYPE is that the model improves gradually, so that each latest version gives the best possible estimate, temporally and spatially, of both water and nutrient flows. Improvements also include changes in the model code, new features and calculation variables.

The credibility of the results is also evaluated by sensitivity analyses and uncertainty estimation. The SMHI Vattenweb contains a tool that visualizes the average deviation in percent between the model value and the measured data.

Vattenwebb utvärdera
Figure 2. The evaluation tool gives the opportunities to get information about the reliability of the results by comparisons with observations. Enlarge Image

Latest version of the S-HYPE

Information about the latest version of the S-HYPE is available at the S-HYPE's news page (Swedish).