Hydrodynamic characterization of soils subject to flooding due to the use and occupation of urban space.
Infiltration; Beerkan; BEST; Urbanization, Environmental Impact.
Urban growth and transformation lead to significant alterations in hydrological systems, resulting in reduced water infiltration and groundwater recharge and increased surface runoff. These modifications, combined with projections of intensified extreme weather events, exacerbate the risk of flooding. The lack of urban planning and adequate control over land use further intensifies these events, making it crucial to understand the hydrodynamic characteristics of affected regions for the prediction and mitigation of such occurrences. The Fragoso River basin in Olinda, PE, faces serious issues with recurrent flooding, with social, ecological, and economic impacts. In this context, this study aimed to investigate the hydrodynamic properties of urban soils to assess, primarily, the water infiltration process in the Fragoso River basin through the application of an indirect measurement method. To this end, the shape and normalization parameters of the and curves, described respectively by van Genuchten and Brooks and Corey, were estimated using the semi-physical Beerkan methodology for the three predominant land cover and use classes in the study area (forest formation, mosaic of uses, and urbanized area), obtained through mapping conducted by the MapBiomas Project. The method is primarily based on simplified infiltration tests and analysis of soil particle size distribution. In the statistical analysis of the results, the Bootstrap resampling method was used to obtain confidence intervals for parameter evaluation. The results highlighted differences between the classes for various properties and were consistent within the range established by the literature. The Beerkan methodology demonstrated satisfactory performance in determining the properties.