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Communication Dans Un Congrès Année : 2024

Tiling watersheds with hexagons and geospatial information for serious games

Résumé

Serious games have become key tools to study the water management in the presence of stakeholders. Such role-playing sessions bring people around game boards to facilitate discussions beyond traditional positions and (sometimes) to trigger positive changes in both representation and behavior. Usually drawn in a synthetic manner, the board (also called “world”) may also be proposed as a realistic interpretation of actual environmental data. This presentation proposes a software for tiling actual watersheds with hexagons. Based on the Topotoolbox, the XGeoTiles GIS software is designed for the watershed delineation and its hexagonal paving in a simplified but realistic manner. Given elevation and land cover data rasters, tiles are drawn as hexagonal flat homogeneous parcels. For each of the tiles, the height is set to the minimum height while land cover is set to the dominant cover (cropland, natural and urban) over the actual land parcel. The flows are restored. XGeoTiles generates shapefiles that are compliant with QGIS. Illustrative examples are the slightly undulating rural watershed of the Moderbach stream (Grand Est region, France, 89 km²) and the rural land-sea watershed flowing to the Bay of Morlaix (Brittany region, France, 312 km²) to offer different gaming opportunities. The tile number is set to about 90 for the Exp’Eau serious game on water quality in rural catchments. In a nutshell, players choose crops (crops or breeding) and level of practice (intensive, normal, bio), may implement eco-friendly measures (buffer strips) and exchange with other players so as to limit water contamination or to improve water quality. Smaller the hexagons, more accurate are the landscape and stream representations. Where gaming rules are not fully satisfied (same number of tiles per player) some hand-coded adaptations may be carried out using either Matlab or QGIS. Note that the conceptual hydrological modeling (gray-box model) is little impacted since the watershed area is well approximated (other parameters remaining constant). In conclusion, in addition to the reliability of the representation, various gaming sessions showed that such gaming boards help stakeholders in their handling of Exp’Eau and their immersion into their player roles.
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Dates et versions

hal-04610579 , version 1 (13-06-2024)

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  • HAL Id : hal-04610579 , version 1

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Isabelle Charpentier. Tiling watersheds with hexagons and geospatial information for serious games. 6th Euro-Mediterranean Conference for Environmental Integration (EMCEI-2024), May 2024, Marrakech, Morocco. ⟨hal-04610579⟩
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