O modelo hidrodinâmico unidimensional apresentou instabilidades devido às regiões íngremes da bacia. A calibração exibiu um bom desempenho (estação Catende NSE=0.78, RSR=0.46 estação Palmares NSE=0.68, RSR=0.57). Os parâmetros taxa de infiltração máxima e coeficiente de pico do método HU Snyder apresentaram maior sensibilidade na calibração do HEC-HMS. A calibração foi avaliada pela eficiência de Nash-Sutcliffe (NSE), percentual de tendência e a razão dada pelo erro quadrático médio pelo desvio padrão dos dados observados (RSR). Precipitação e vazão sub-diárias foram utilizadas nos modelos Hydrologic Engineering Center-Hydrologic Modeling System (HEC-HMS) e River Analysis System (HEC-RAS). O artigo tem como objetivo avaliar a modelagem hidrológica e hidrodinâmica com dados sub-diários dos maiores eventos de cheia da bacia do rio Una nos anos de 2011 e 2017. Hydrologic modeling system natural disasters river analysis system 2D simulationĮventos extremos de cheia que ocorrem poucas horas após a precipitação em regiões de altas declividades, conhecidos como flash flood, são observados na bacia hidrográfica do rio Una. The 2D solution was needed to overcome this problem, allowing us to represent the water level in the city of Palmares satisfactorily. During HEC-RAS 1D flow simulations, steep regions in the Una River caused numerical instabilities. The calibration of the HEC-HMS showed good performances (Catende station NSE=0.78 and RSR=0.46 Palmares station NSE=0.68 and RSR=0.57). The maximum infiltration rate and the Snyder peak coefficient estimation were the most sensitive parameters in the hydrological model. Model evaluation methods such as Nash-Sutcliffe efficiency (NSE), percent bias, and the ratio of the root mean squared error to the standard deviation of measured data (RSR) were used in the calibration process. Sub-daily precipitation and streamflow were applied to the models Hydrologic Engineering Center-Hydrologic Modeling System (HEC-HMS) and River Analysis System (HEC-RAS). The objective of the paper was to assess the sub-daily hydrological and hydrodynamic modeling of flood events in 20. This particular type of flood is a short-duration hydrological event with occurrence of the peak flow within minutes to few hours after the onset of the rainfall, taking place typically in mountainous regions. Hydraulic modeling checklist (updated June 2014)Ĭlick on a chapter heading below to reveal links.Flash floods are observed in the Una River Basin, Pernambuco/Brazil.Flow Chart: Overview for Floodplain Analysis.LOMRs, Flood Control Projects, & Levees.Chapter 10: Presentation of Modeling Results (updated October 2014).Chapter 9: Guidelines for Alternate Hydraulic Models (updated February 2016).Chapter 8: Guidelines for Hydraulic Modeling Using HEC-RAS (updated August 2016).Chapter 7: Guidelines for determining peak discharges.Chapter 6: Researching and Evaluating Existing Models (Updated March 2015).Chapter 5: Surveying Standards and Methods (updated June 2014).Chapter 4: Mapping Standards and Methods (updated December 2014).Chapter 3: Overview of the Process for Performing a Detailed Floodplain Analysis (updated August 2014).Chapter 2.5: Non-modeling Assessment Approaches Used by the IDNR (updated June 2014).Chapter 2: Obtaining a Floodplain Determination for a Minor Site Assessment (updated August 2014).Chapter 1: Introduction (Updated March 2015).Also included in this guide are recommendations on presenting results of a floodplain study and other useful reference material. The guidelines detail methods acceptable to both the Indiana Department of Natural Resources (IDNR) and the Federal Emergency Management Agency (FEMA) with respect to hydrologic and hydraulic modeling and floodplain mapping. General Guidelines for the Hydrologic-Hydraulic Assessment of Floodplains in Indiana was created to assist the floodplain management community in establishing base flood elevations and floodway limits and in evaluating projects in accordance with the Indiana Flood Control Act and the National Flood Insurance Program. General Guidelines for the Hydrologic-Hydraulic Assessment