Jose G. Vasconcelos

Jose G. Vasconcelos
Auburn University | AU · Department of Civil and Environmental Engineering

PhD, Environmental Engineering
Associate Professor - Department of Civil and Environmental Engineering, Auburn University

About

118
Publications
30,607
Reads
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1,070
Citations
Introduction
My interests are in fluid mechanics, urban water systems and headwater stream hydrology, applying as tools computational hydraulics, multi-phase flows, physical models and CFD.
Additional affiliations
September 2015 - present
Auburn University
Position
  • Professor (Associate)
January 2010 - August 2015
Auburn University
Position
  • Professor (Assistant)
September 2006 - December 2009
University of Brasília
Position
  • Associate Professor (Adjunto 2)
Education
August 2001 - September 2005
University of Michigan
Field of study
  • Environmental Engineering
March 1997 - January 2000
University of Brasília
Field of study
  • Environmental Technology and Water Resources
August 1990 - July 1995
University of Brasília
Field of study
  • Civil Engineering

Publications

Publications (118)
Article
Full-text available
Stormwater management needs attention as it causes surface flooding and pollution of nearby waterbodies. Parkerson Mill Creek in Auburn University, which gets polluted through surface runoff, is an example of this. In this study, a Personal Computer Stormwater Management Model (PCSWMM) was used to determine the susceptibility of the existing stormw...
Article
Full-text available
The City of Columbus, Ohio is implementing a tunnel system to reduce the number of episodes of combined sewer overflows into the Scioto River. The tunnel systems provide relief to the existing Olentangy Scioto Interceptor Sewer. Two new tunnels being implemented are the OSIS Augmentation and Relief Sewer (OARS), in service since July 2017, and the...
Article
Full-text available
Green infrastructure (GI) practices are an effective means for improving the sustainability of stormwater management. Optimized combinations of GI practices with other management practices, such as detention basins, can maximize performance and cost effectiveness, and simple methods for identifying these combinations will promote more widespread us...
Article
Full-text available
The increasing frequency of intense rain events will worsen the operational conditions of stormwater systems, including the frequency in which these systems experience pressurization. Unfortunately, there has been limited research on the issue, particularly the pressurization of junctions in stormwater systems that are subject to rapid filling. Pas...
Article
This paper shows how low-impact development (LID) practices affect the resilience of stormwater drainage system under climate change scenarios. A rainfall-runoff model was calibrated and evaluated a in a tropical watershed located in Midwestern Brazil. An ensemble of 17 general circulation model outputs forced by Representative Concentration Pathwa...
Article
Full-text available
Stormwater tunnels often have massive geometries, with conduits lengths of several kilometers and a wide range of diameter sizes. Modeling rapid filling of these systems is a complex task and needs adequate methodology. One model used in hydraulic analysis of stormwater tunnels is the EPA's Storm Water Management Model. However, model setup conditi...
Article
Full-text available
One of the most used 1D tools to model collection systems is the Storm Water Management Model (SWMM). Solving the full form of the Saint Venant equations, this model represents typical unsteady flow conditions in sewer systems. However, it may be insufficient to address fast transient flow conditions that can be present during extreme events or uns...
Article
Existing pipe-filling models have primarily considered steady friction alone, tending to underestimate pressure attenuation. Various popular unsteady friction models are considered here to simulate pressures within a rapidly filling vertical pipe. Numerical predictions are compared to each other and to experimental results. The models considering u...
Conference Paper
Full-text available
Riprap is widely used by state departments of transportation (DOTs) for erosion control and slope stabilization purposes. Even though DOTs seem to be satisfied with the ability of riprap to fulfill its intended purpose, its cost-effectiveness has been increasingly questioned, mainly in job sites where riprap is not locally or nearby available resul...
Conference Paper
Full-text available
Manholes are vertical shafts connecting underground sewers with street-level terminals. They are covered by heavy lids. During periods of heavy rainfall, the air column in the upper part of the manhole may be compressed to such high level that the lid moves up. Of course, this is a dangerous situation for pedestrians and road traffic. Bolting the l...
Conference Paper
Full-text available
Green infrastructure practices (GIPs) are a set of design principles, practices, and engineered devices that capture and treat stormwater runoff at its source using natural processes such as infiltration and evapotranspiration. Green infrastructure can reduce the effects of increased impervious area associated with land development by reducing the...
Chapter
Full-text available
CFD Modeling of storm geysers using ANSYS CFX and OpenFOAM
Article
Full-text available
The Storm Water Management Model 5.1 (SWMM) is a widely-adopted dynamic hydrologic and hydraulic model often used to estimate runo˙ quantity and quality in urban drainage systems. SWMM unsteady flow algorithm, EXTRAN, is based on a link-node solution that enables it to represent well typical stormwater inflows. Yet, for rapid inflow conditions asso...
Article
Full-text available
Pumping systems is a topic of great relevance in the teaching of Civil and Environmental Engineering courses related to urban water infrastructure. One key component of this teaching covers the diameter selection of transmission mains in drinking water systems. This selection process includes a number of considerations which should lead the enginee...
Article
Full-text available
Stormwater systems are subject to operational issues while undergoing rapid filling during intense rain events. In various instances, air-water interactions take place and it is possible that the air located in the headspace of manholes will be pressurized. Air pressurization can be created by rapid changes in water free surface within vertical sha...
Article
Full-text available
Understanding air pocket formation in closed conduits is important in urban water systems subject to rapid filling conditions, such as the case of stormwater sewers and tunnels during intense rain events. Captured air pockets influence surging and, upon uncontrolled release, lead to issues such as manhole cover displacement and/or geysering. Differ...
Conference Paper
Full-text available
Dancing manhole covers are an intriguing and curious phenomenon but extremely dangerous for road vehicles as well as pedestrians. They are reported worldwide after heavy rainfall in urban environment. Stormwater systems are overloaded with running water containing large entrapped air pockets for which manholes form an escape route. However, heavy l...
Article
Full-text available
Certain closed conduits may undergo processes of rapid filling, in which the flow regime 3 transits from open channel into pressurized flows. Air bubbles may be entrained through such 4 pressurization interfaces, and this entrainment can have effects on the flow dynamics. While air 5 entrainment in static hydraulic jumps have been studied in closed...
Conference Paper
Full-text available
Rapid filling flows in stormwater systems during rain events has been cause of diverse operational problems and as result this has been investigated by a significant group of researchers to date. Frequently in these studies, a variety of numerical modeling tools has been applied while trying to understand these unsteady, two-phase flow conditions....
Article
Full-text available
The Stormwater Management Model (SWMM) is a hydrologic–hydraulic model often used to simulate water flows in urban drainage systems and changes in water quality. The unsteady flow hydraulic solver in SWMM solves mass and momentum conservation equations for the entire conduit length, and mass is conserved at each junction. This link–node approach us...
Conference Paper
Full-text available
The Storm Water Management Model (SWMM), currently in version 5.1, is a dynamic rainfall-runoff model that is often used to estimate runoff quantity and quality, primarily in urban areas. The model has an unsteady hydraulic algorithm based on an EXTRAN module that, due to its link-node solution, it is adequate for gradual filling scenarios but it d...
Article
Full-text available
Sediment basins are temporary practices commonly used to detain stormwater runoff and capture suspended sediment on construction sites. A 79.0 m 3 (2790 ft 3) sediment basin testing apparatus at the Auburn University-Erosion and Sediment Control Testing Facility was used to provide a series of controlled and repeatable, large-scale tests to underst...
Article
Full-text available
Stormwater systems, while designed to operate in free surface flow conditions, can undergo transition to pressurized flows during rapid filling conditions where inflows exceed the conveyance capacity of sewers and tunnels. Such conditions are referred to as mixed flows or flow regime transitions and pose a challenge to traditional unsteady numerica...
Article
Full-text available
Estimating sediment deposition in a stream, a standard procedure for dealing with aggradation problem is complicated in an ungauged catchment due to the absence of necessary flow data. A serious aggradation problem within an ungauged catchment in Alabama, USA, blocked the conveyance of a bridge, reducing the clearance under the bridge from several...
Conference Paper
Full-text available
Stormwater geysers are an undesired operational issue that occurs when runoff in stormwater systems returns to the grade through vertical shafts when these systems are undergoing rapid filling. Among other mechanisms, the release of large entrapped air pockets through ventilation shafts is a likely cause of many recently reported geyser events. The...
Conference Paper
Full-text available
The influence of air phase on the flow behavior in urban stormwater systems was experimentally assessed in a physical model, which reproduces a long section of a stormwater system implemented in 2008, in Porto Alegre (Brazil). A severe structural failure has occurred in this stormwater system in 2013 and has motivated the physical model set up. All...
Conference Paper
Full-text available
Understanding the behavior of air-water interactions in closed conduits is very important for urban water systems that are subject to rapid filling conditions, such as stormwater systems during intense rain events. Among different mechanisms for air pocket appearance in closed conduits, shear flow instability is one that have significant capability...
Article
Full-text available
Sediment basins provide quiescent conditions that enable settling of fine particles present in runoff, mitigating environmental effects created by excessive sediment discharges. Yet, settled particles are susceptible to undesired resuspension if, during dewatering of the basin, new flows are admitted that increase velocities, shear forces, and turb...
Article
Sediment basins provide quiescent conditions that enable settling of fine particles present in runoff, mitigating environmental effects created by excessive sediment discharges. Yet, settled particles are susceptible to undesired resuspension if, during dewatering of the basin, new flows are admitted that increase velocities, shear forces, and turb...
Presentation
The Stormwater Management Model (SWMM) is a hydrologic-hydraulic model often used to simulate flows in collection systems, as well changes in water quality in these systems. Regarding the hydraulic solver used by SWMM, mass and momentum conservation equations are solved for each conduit, along with mass conservation at each junction. At each rout-i...
Article
Full-text available
Stormwater systems undergoing rapid filling may present a variety of operational problems, one such being the displacement of manhole covers, which can threaten both traffic and pedestrians. There are scarce documentation and few measurements of flow conditions in rapidly filling stormwater systems, and it is speculated that air pressurization with...
Article
Full-text available
Uncontrolled air pocket release from water-filled shafts can lead to geysering in stormwater systems. Such occurrences are deleterious from public health and environmental standpoints and can cause property and structural damage. Causes, frequency, magnitude, and location of geysering events still are poorly understood and pose practical difficulti...
Conference Paper
Full-text available
Modelos hidráulicos computacionais unidimensionais mostram-se de grande utilidade na engenharia, tanto por sua simplicidade quanto por seu baixo custo computacional. Este trabalho possui como objetivo realizar a modelagem de um canal retangular com um vertedor triangular em sua extremidade de jusante utilizando as equações de Saint-Venant, a fim d...
Article
Full-text available
Hydrologic models are widely used to represent and study water flows in various land uses and environments. This paper presents work done to model stormwater runoff from an interstate and forested watershed in Alabama using two models: Gridded Surface/Subsurface Hydrologic Analysis (GSSHA) and Storm Water Management Model (SWMM). Of particular impo...
Article
Full-text available
Uncontrolled air pockets release from water-filled shafts can lead to geysering in stormwater systems. Such occurrences are deleterious from public health and environmental standpoint and can cause property and structural damage. Causes, frequency, magnitude, and location of geysering events are still poorly understood, and pose practical difficult...
Article
Storm water and combined sewer systems are subject to rapid filling during intense rainfall events. These large-sized systems require a significant amount of air to be vented during filling. Several systems have experienced operational problems such as structural damages and geyser release through ventilation shafts. Observations from one storm wat...
Conference Paper
Full-text available
The operational issues created by episodes of storm water geysering have drawn researchers and engineers’ attentions in the past 20 years. However, only recently that more insights has been obtained in the geysering events caused by uncontrolled release of trapped air pockets in a water-filled vertical shaft. With better understanding upon the key...
Article
Full-text available
Surges caused by the sudden compression of entrapped air pockets are a source of serious issues in various hydraulic conveyance systems. Such surges may appear during rapid filling of stormwater sewers and storage tunnels, priming of water pipelines, and other applications when air is quickly displaced by inflows. When ventilation is inadequate dur...
Article
Many watershed studies rely on pressure transducers to measure and report stream and groundwater levels in order to characterize the hydrology of the region. The accuracy of pressure transducers in some applications have recently been questioned in studies reporting artificially exaggerated high or low pressure readings that cannot be explained by...
Article
Deep storage tunnels are an alternative to mitigate combined sewer overflows, but they may develop transient flow problems during rapid filling conditions. Such issues include excessive surges, formation of pipe-filling bores, entrapped air pocket, and uncontrolled release of air. Initial decisions on stormwater tunnel designs are generally based o...
Article
Stormwater regulations require construction-generated pollution to be controlled on-site prior to discharge to avoid impairment of receiving waterbodies. Sediment basins are stormwater detention practices commonly used to capture and treat sediment-laden runoff prior to discharging from a construction site. Federal and state highway and environment...
Conference Paper
Full-text available
Recent investigation has led to the understanding that geyser formation can be caused by the uncontrolled release of air pockets that become entrapped in storm water systems. Such occurrences are deleterious in the public health point of view and may cause property and structural damage. Causes, frequency, magnitude, and location of geysering event...
Conference Paper
Sediment basins are designed to mitigate damage to delicate natural environmental features such as streams and prevent excessive amounts of water from escaping construction sites as runoff. This runoff is often heavily soil-laden water and often requires an undisturbed settling time in the order of hours or days if fines (e.g., silts) are present....
Conference Paper
Full-text available
An initial assessment of interstate runoff impacts to a receiving water body yielded approximately 2 years of groundwater, surface water, and streamflow measurements upstream and downstream of a section of an interstate within a rural/forested watershed. It became clear that stormwater runoff is larger downstream of the interstate, but analysis of...
Article
Full-text available
Numerical modeling indicates that high pressures can be expected when trapped air at the end of a pipeline is compressed as it stops a moving water column. In particular, the model results show that larger pressures are to be expected when compressed air volumes are small. Laboratory experiments where a trapped air pocket is compressed by an advanc...
Conference Paper
Full-text available
Water mains and stormwater sewers and tunnels may undergo processes of rapid filling, in which flow regimes transit from open channel into pressurized flows. Numerical simulation of such flows using mixed flow (also known as flow regime transition) models adopt values for the celerity of pressure waves that are compatible with fully pressurized flo...
Conference Paper
Full-text available
Stormwater runoff from highways has been a relevant focus of study both in terms of its characterization during construction phases as well as during the years following its operation. Highways have been thought to have adverse impacts on the water quality of nearby water bodies in terms of parameters such as solids, turbidity, metals, among others...
Conference Paper
Full-text available
The computation of the celerity of shockwaves and rarefaction waves following a dam-break event is very relevant and demand adequate numerical tools. CFD models have been used in dambreak analysis, and are particularly adequate when complex geometries are involved. Shallow-water based models are also very popular for the simulation of these flows,...
Article
Full-text available
The entrapment and compression of air in closed conduits is a relevant problem in pipeline systems that experience unsteady flow regimes. Severe surging resulting from large air compressibility leads to failures, structural damage and other operational issues. Various studies have been performed on the topic, most of which simplified the flow equat...
Article
Full-text available
The shallow water equations (SWEs) are implemented in gravity current (GC) models because of the good balance between accuracy and computational effort. In this context appropriate treatment is required at the GC leading edge that is analogous to a moving boundary condition. To date, solution strategies used at the leading edge have not been system...
Article
Full-text available
Entrapped air pockets are linked to various operational issues in closed pipe flows. Tracking of entrapped air pockets is a relevant task in numerical simulation of hydraulic systems subjected to air pocket entrapment. However, few studies have focused on the kinematics of discrete air pockets and the motion of these at various combinations of pipe...
Conference Paper
Rapid filling flow conditions in closed conduits may lead to the development of flow regime transition between free surface and pressurized flow regimes. These flows are interesting and relevant because they are due to moving hydraulic jumps, pressure surges, and other interactions between air-water phases. Such flow conditions are anticipated for...
Conference Paper
Surges triggered by entrapped air pockets have the potential to cause significant structural damage in hydraulic systems. In many cases surge calculations in stormwater tunnels and other hydraulic structures do not account explicitly for these adverse air-water interactions. Vasconcelos and Leite recently explored the relationship between discharge...
Article
Full-text available
There are important adverse effects linked to the presence of entrapped air pockets in stormwater systems. These effects include loss of conveyance, surging caused by air compression, loss of storage, and geysering. The capability to monitor the formation and motion of entrapped air pockets is highly desirable when modeling extreme rain events in s...
Article
Full-text available
The Storm Water Management Model (SWMM) has proven highly effective in modeling urban and suburban watersheds since its conception in 1969. While heavily implemented in the simulation of urban watersheds, its performance in strictly rural water-sheds has been less frequently evaluated. Lower Coastal Plain watersheds are prevalent in the southern Un...
Article
Full-text available
Some studies have shown that stormwater runoff may have constituents that cause adverse impacts to aquatic ecosystems. Various related studies have focused either on characterizing the runoff directly generated on roads or on the effectiveness of various pollutant removal techniques. This work presents and discusses the results of an ongoing invest...
Article
Full-text available
Among the various applications of the shallow water equations (SWEs) is the simulation of gravity currents (GCs). The SWEs are used as an alternative to track GC motion without explicitly dealing with turbulent processes, and constitute an intermediate solution between simpler integral models and more comprehensive models based on the Navier-Stokes...
Article
Full-text available
In order to avoid operational issues related to entrapped air in water transmission mains, water refilling procedures are often performed carefully to ensure no pockets remain in the conduits. Numerical models may be a useful tool to simulate filling events and assess whether air pockets are adequately ventilated. However, this flow simulation is n...
Conference Paper
When stormwater storage tunnels undergo rapid filling during intense rain events, many different mechanisms can lead to the entrapment of air pockets within these tunnels (Vasconcelos and Wright, 2006). Entrapped air pockets have been linked to operational issues like damaging surges, loss of storage capacity, and severe geysering upon release thro...
Conference Paper
Full-text available
The shallow water equations (SWE) are a popular choice in gravity current (GC) models because of the good balance between accuracy and computational effort. This work presents a two-layer SWE model developed for high Reynolds number GC that accounts for ambient crossflows often encountered in the environment. The mathematical model is written in co...
Article
Full-text available
Flow regime transition is observed in closed conduit when there is a transition between free surface and pressurized flows. This condition is often observed in stormwater storage tunnels undergoing rapid filling. Such tunnels provide stormwater control in urbanized areas, relieving the stormwater collection system during intense storms. Operational...
Article
Full-text available
Deep storm-water storage tunnels may undergo pressurization during intense rain events. In the process, air pockets may