First delimitation and land-use assessment of the riparian zones at Uruguayan Pampa

The expansion and intensification of agriculture frequently affect riparian zones, mainly in basins where agriculture is the most important activity. In countries with basins dominated by agricultural activities, land use change in riparian zones promotes water quality loss and biodiversity degradation. As a tool to prevent these environmental impacts, the delimitation of riparian zones and buffer strips is crucial. For that purpose, photo interpretation jobs and botanical studies are usually necessary. However, a digital terrain model (DTM) becomes the best alternative when the information is unavailable or the survey area is too large. This work made the first delimitation of riparian zones of the country's water drainage network. The results obtained by using a 1-m vertical buffer in DTM allowed the delimitation of the riparian zones of Uruguay. The results indicate that of the areas identified as riparian, 62% would be authentic and that the 29% of riparian areas identified under cultivation could rise to 46% if the identification improved the identification accuracy. The results indicate the existence of 4,608,890 ha of riparian zones, of which 94,651 ha could be under cultivation.

Automated summary

This study conducted the first delimitation of riparian zones within the country's water drainage network. Using a 1m vertical buffer in DTM allowed for the delimitation of riparian zones in Uruguay, revealing that 62% of the identified riparian areas were authentic, and the percentage of riparian areas identified under cultivation could increase to 46% with improved identification accuracy. The results indicated the presence of 4,608,890 hectares of riparian zones, with 94,651 hectares potentially under cultivation.