Steps towards an early warning model for flood forecasting in Durazno city in Uruguay

Abstract

A hydrologic–hydrodynamic model of the Yi River basins in Uruguay has been developed as a support tool to the Emergency Coordination Centre of Durazno city. The purpose was to improve the existing decision support system and the emergency planning by providing information on gauge height and its permanence in time, and the risk of flooded areas. Four past flood events of high return period were used for calibration and validation with accurate results. The input data to the operational model in real time are hourly observed rainfall and gauge height, as well as rainfall forecasts by several international sources. The use of predictions from numerical weather forecasts allows for the generation of pre‐alert scenarios with larger lead time. These scenarios can warn the emergency coordinators, and thus are of great value to premanage a probable emergency. Operation of a meteorological weather alert issued by the National Meteorological Board is discussed.

High‐resolution urban flood model for risk mitigation validated with records collected by the affected community

“…Typically, urban floods are studied using 1D (Silveira, López, Chreties, & Crisci, 2012), 1D/1D (dual drainage system; Mark, Weesakul, Apirumanekul, Boonya Aroonnet, & Djordjevic, 2004;Leandro, Chen, Djordjevi c, & Savi c, 2009), 2D (overland flow; Roca & Davison, 2010;Liang & Smith, 2015), or 1D/2D (Chen, Leandro, & Djordjevi c, 2015;Velasco, Cabello, & Russo, 2016) hydraulic modelling approaches. Choosing the most appropriate modelling technique means balancing accuracy, computation time and data availability, and also taking into account the level of communication between the major and minor drainage systems ( van Dijk, van der Meulen, Kluck, & Straatman, 2014).…”

Sistema de alerta temprana para previsión de avenidas en la ciudad de Durazno

“…En los Gráficos 1 y 2 se presentan los resultados de la calibración y validación del modelo para cada uno de los eventos seleccionados. Mayores detalles de los resultados de la calibración del modelo se pueden consultar en Silveira, et al, 2012.…”

Caracterización del impacto por inundación en una cuenca urbana

“…Típicamente, las inundaciones urbanas son estudiadas usando aproximaciones de modelación 1D (Silveira et al, 2012), 1D/1D (Mark et al, 2004;Leandro et al, 2009), 2D (Roca y Davison, 2010;Liang y Smith, 2015) o 1D/2D (Chen et al, 2015;Velasco et al, 2016), siendo las modelaciones 1D y 2D representativas del curso principal y 1D/1D y 1D/2D del sistema dual de drenaje urbano. Seleccionar la técnica de modelación más apropiada significa equilibrar la precisión, el tiempo de computación y disponibilidad de datos, y además tomar en cuenta el nivel de comunicación entre los sistemas de drenaje mayor y menor (van Dijk et al, 2014).…”