Estudio de obras de encausamiento; caso de estudio: Río Burgay, tramo Biblián (desde el camal) hasta el Puente 16 de Abril de la Ciudad de Azogues

Abstract

Mismanagement along the margins of the Burgay River and the increased precipitation in its sub-basin has heightened the need for channeling works in Biblián and Azogues. This is due to a series of disasters occurring in certain critical overflow areas, which are identified in this study and present the sizing of the effective diameter required in the rockfill to redirect the flow by altering the cross-sectional area of the channel. This is crucial, considering that it is a mountain river directly influenced by precipitation within the watershed that defines its hydrographic basin. A flood is simulated with maximum precipitation intensities using ArcMap maps and digital modeling with the Hydrologic Engineering Center’s Hydrologic Modeling System (HEC – HMS), and the River Analysis System (HEC – RAS) to select the necessary rockfill capable of channeling the river through barriers at critical points. Variables, such as rainfall intensity, vegetation coverage, type and land use, flow rate, roughness, and the mean dynamic topography (MDT) of the channel slope are considered. Empirical formulas proposed by hydraulic flow specialists, such as Maynard and Isbash, are analyzed to estimate the vulnerability level of the riverbanks based on variables obtained in the simulation, including water depth, velocity, Froude number, and river width in the three vulnerable critical areas: San José Bridge, Sucre Market, and Del Migrante Park. These areas require rockfill with an average diameter of 1.50 m.