Application of the Flood Guidance Model (FG) in the Yi River basin in Uruguay
DOI:
https://doi.org/10.31285/AGRO.27.1191Keywords:
flood warnings, satellite imagery, antecedent precipitation index, rural floodingAbstract
This study focuses on the application/adaptation of the Flash Flood Guidance (FFG) model developed by the National Weather Service (NWS). The FFG is defined as the total amount of rainfall of a given duration sufficient to cause bankfull flow at the outlet of the watershed. Since flash floods do not occur in Uruguay due to the slower hydrologic response of the watershed, an adaptation of the above model is evaluated and renamed Flood Guidance (FG). Nine storm events that occurred between 2014 and 2020 in the Yi River basin in Uruguay were analyzed. The Natural Resources Conservation Service (NRCS) Curve Number model, a simple and widely used model, is used to determine effective precipitation. Two alternatives are considered to determine the antecedent soil moisture: the use of an antecedent precipitation index (API), and the use of SMOS satellite imagery. The FG is then calculated and compared to the precipitation forecast to determine if there is a risk of flooding at the watershed outlet. The results are compared to observations to evaluate the quality of the warning forecast. The application for forecasting flooded rural and agricultural areas using Sentinel-2 satellite imagery and the NDWI index is considered and analyzed.
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