ICFM6 - International Conference On Flood Management

Data: 17/09/2014 à 19/09/2014
Local: São Paulo - Brazil

Improvement in Full Ones Propagation Simulator for Flood Zones Adjacent Stream Monjolo in Patos De Minas - Mg (PAP014780)




Ana Clara Mendes Caixeta, José Eduardo Alamy Filho


Urban Floods


In Brazil, especially during the rainy season, lack of adequate urban planning and the significant population growth aggravate the flooding problems in urban areas. Furthermore, the country needs tools that allow managers to implement a more condicente planning. Among these tools there is the scenario simulation situations. In elaborating this models are used primarily with regional characteristics and variables of natural disaster events (flood, sliding landslide, land parcels, etc.). Besides these features are necessary utilized appropriate equipment (software and hardware), reliable input data and a set of representative variables for computing plan. Thus, it is possible to improve the models and to support proper planning. Thus, this paper aims to improve the simulator developed by Rezende (2012) for the propagation of full ones and delineation of flood areas in vicinity of a canal urban. That simulator was built in Excel and possesses computational code written in language Visual Basic for Applications (VBA). For the feeding of this model was based on three stages, the first is digital elevation model (DEM) with the vicinity mesh, that spatializes the study area and is the basis for hydrologic-hydraulic model. The second is the model hydrologic with the characteristics of the river basin, in this was used method Saint Barbara. And finally the third utilized for the characterization of channel, that utilizes the kinematic wave propagation for one-dimensional. These three stages are essential to abstract the physical environment for computational environment. However, the event of flood needs a large number of variables in this process of abstraction. Given this necessity of information work performed a rating-curves, the lateral storage and inundograma. The rating curves were constructed for flow depths of up to seven meters, with the wet area (Am) and wetted perimeter (Pm) allowing to visualize the behavior of these hydraulic parameters as a function of increasing depth (h) of the flow. Thus, early in the processing of the code, before the iterative procedures, Am x h and Pm x h relationships are obtained for all discrete sections. When the overflow occurs, the water reaches the flood plain, forming a volume which has temporary storage lateral that has a longitudinal velocity with many orders of magnitude smaller than the velocity of flow in the main channel about the designed sector size. This feature can be modeled by establishing a condition internal storage lateral contour as the work of Pires and Barbassa (1997). When the sum of the flooded areas (?AIN) is plotted as a function of time (t) elapsed after the start of precipitation, there is a diagram in this work that is called inundograma. The possibility of building inundogramas is another attribute of the program, allowing to identify the duration of the flood and flood moments. Thus, with an agility for the simulations, the area determination and the overflow inundograma generates an increasing number of data generated for a suitable urban planning and therefore an improvement of living for the population.

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