César SantosUniversidade da Beira Interior | UBI · Department of Civil Engineering and Architecture
César Santos
MSc (Civil Engineering)
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11
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Publications (11)
Vegetation plays a vital role in the flow characteristics of natural open channels, such as rivers. Typically, vegetation density is higher in the lower layer and sparser in the upper layer of these channels. In this research, Ansys Fluent and the k–ϵ model have been employed to simulate various vegetation configurations to capture intricate flow c...
Research of hydrodynamics interactions between in-channel vegetation and the main channel is essential for researchers and hydraulic engineers to design, manage and rehabilitate river systems. This chapter intends to experimentally analyse how the hydrodynamic structures of the flow are a ected by rigid emergent vegetation occupying a third of the...
The large pier of an emblematic bridge built in 2008 in the Ebro River (Zaragoza, Spain) obstructs the flow in high floods. Clear-water scour experiments in a scale model were conducted to anticipate maximum local scour depths and design riprap protections. These proved to be effective during a large flood event in 2015, but bed aggradation under t...
Measuring and estimating dispersion coefficients for ash particles released in watercourses is required for a broad understanding of their transport and behaviour in aquatic ecosystems. Calibration of a high-frequency acoustic backscattering system and estimates of its sensitivity to particulates of known size distribution and concentration are pre...
Forest fires, in addition to the substantial economic losses and the negative impact on terrestrial ecosystems, are responsible for several problems in aquatic environments. Ashes which are mobilized by rainfall from slopes to river systems, besides polluting watercourses, their transport in suspension can directly affect the hydrodynamic processes...
Wildfires are responsible for feeding ash to watercourses that are downstream of the burned area. The presence of riparian vegetation promotes the retention of ash from wildfires during the first rainfalls. Thus, the study of the transport of wildfire ash suspended in flows in rivers with vegetation is relevant for the management of watersheds and...
In this communication, the experimental results obtained in a partially vegetated channel, consisting of an area with a staggered matrix, are analyzed in order to study the influence of vegetation on the mass and lateral momentum transfers. The mixing layer width is also quantified, using theoretical models, as it plays a significant role in these...
Nesta comunicação analisam-se os resultados experimentais obtidos num canal parcialmente vegetado, constituído por um corredor de matriz escalonada emergente rígida, visando estudar a influência da vegetação nas transferências laterais de massa e quantidade de movimento. É ainda quantificada a espessura da camada de mistura, através de modelos teór...