Navid Tahvildari

Navid Tahvildari
Old Dominion University | ODU · Department of Civil and Environmental Engineering

PhD

About

31
Publications
7,069
Reads
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170
Citations
Additional affiliations
November 2011 - May 2014
Stanford University
Position
  • PostDoc Position
September 2007 - October 2011
Texas A&M University
Position
  • Research Assistant
September 2005 - August 2007
Sharif University of Technology
Position
  • Master's Student

Publications

Publications (31)
Article
Full-text available
Low-lying coastal cities across the world are vulnerable to the combined impact of rainfall and storm tide. However, existing approaches lack the ability to model the combined effect of these flood mechanisms, especially under climate change and sea level rise (SLR). Thus, to increase flood resilience of coastal cities, modeling techniques to impro...
Article
Full-text available
In this study, we have developed a two-way fully coupled hydrodynamic-vegetation model that includes a spatially and temporally variable drag coefficient of flexible submerged aquatic vegetation (SAV). The developed model consists of a nonhydrostatic wave model (NHWAVE) that solves the Navier-Stokes equations and a numerical model for vegetation st...
Article
Hurricanes cause substantial inundation of transportation networks, rendering them inaccessible to emergency response vehicles. Because storm tides and heavy rainfall often co-occur during hurricanes, a reliable assessment of roadway inundation in coastal areas requires adequate representation of both flood sources. This study serially coupled a hy...
Preprint
Full-text available
Low-lying coastal cities across the world are vulnerable to the combined impact of rainfall and storm tide. However, existing approaches lack the ability to model the combined effect of these flood mechanisms. Thus, to increase flood resilience, modeling techniques to improve understanding and prediction of the combined effect of these flood hazard...
Article
Full-text available
A numerical model is extended to investigate the nonlinear dynamics of surface wave propagation over mud in the presence of currents. A phase-resolving frequency-domain model for wave-current interaction is improved to account for wave modulations due to viscoelastic mud of arbitrary thickness. The model compares well with published laboratory data...
Article
Full-text available
Improving our understanding of the interactions between gravity waves, currents, and coastal vegetation, which are nonlinear in nature, enables coastal engineers and managers to better estimate hydrodynamic forces on coastal infrastructure and utilize natural elements to mitigate their impacts. Aquatic vegetation is ubiquitous in coastal waters and...
Article
Full-text available
Relative sea level rise increases the vulnerability of coastal infrastructure to 1 storm surge flooding. In this study, we develop a hydrodynamic+wave model 2 and apply it to simulate storm surge inundation under different local sea level 3 projections to quantitatively assess some of these vulnerabilities. Our study 4 area is located in southeast...
Article
A numerical modeling approach is applied to investigate the combined effect of wave-current-mud on the evolution of nonlinear waves. A frequency-domain phase-resolving wave-current model that solves nonlinear wave-wave interactions is used to solve wave evolution. A comparison between the results of numerical wave model and the laboratory experimen...
Article
Full-text available
Coastal economies are often supported by activities that rely on commercial or recreational vessels to move people or goods, such as shipping, transportation, cruising, and fishing. Unintentionally, frequent or intense vessel traffic can contribute to erosion of coastlines; this can be particularly evident in sheltered systems where shoreline erosi...
Article
Full-text available
Low-lying coastal cities are vulnerable to flooding under the combined impact of storm tide and heavy rainfall. While storm tide or heavy rainfall alone is able to directly cause widespread flooding in coastal areas, often heavy rainfall and storm tide happen concurrently, and the severity of flooding is greatly exacerbated. Current methods for und...
Article
Full-text available
Accurate prediction of wave energy dissipation over mud is essential for understanding nearshore circulation, sediment transport processes, and design of engineering projects along muddy coasts. It is desirable to be able to simulate wave propagation over a wide range of mud behaviors as wave evolution is highly dependent on mud rheological charact...
Conference Paper
Full-text available
The coastal regions in the US East Coast and the Gulf of Mexico are under the risk of storm surge and precipitation-driven flooding. The adverse impacts of climate change including sea level rise (SLR), potential increase in intensity and frequency of extreme storms, and increase in precipitation intensity increases the vulnerability of coastal com...
Article
Living shorelines integrate structural and natural features to stabilize the shoreline, through reduction of erosion from the wave climate, while keeping the connectivity between land and aquatic ecosystems. This study includes field study for two different types of living shoreline systems to quantify and compare their wave dissipation services an...
Article
Building flood resilience in coastal communities requires a precise understanding of the temporal and spatial scales of inundation and the ability to detect and predict changes in flooding. In Hampton Roads, the Intergovernmental Pilot Project’s Scientific Advisory Committee recommended an integrated network of ocean, earth, and atmospheric data co...
Article
Hampton Roads is a populated area in the United States Mid-Atlantic region that is highly affected by sea level rise (SLR). The transportation infrastructure in the region is increasingly disrupted by storm surge and even minor flooding events. The purpose of this study is to improve our understanding of SLR impacts on storm surge flooding in the r...
Conference Paper
In this study, we develop a hydrodynamic model to study the vulnerability of the transportation infrastructure in the Hampton Roads region of Virginia to storm surge flooding under sea level rise. The hydrodynamic model was validated for tide prediction and its performance in storm surge simulation was validated with data for Hurricane Irene (2011)...
Article
Full-text available
Coastal wetlands are among the natural features with the capability to dissipate wave energy and reduce storm damage. Inadequate representation of wave and vegetation characteristics in numerical models may reduce their capability in predicting wave processes over wetlands. Previous numerical wave models have typically applied simplifications on ve...
Technical Report
Full-text available
In this study, we develop a hydrodynamic model to study the vulnerability of the transportation infrastructure in the Hampton Roads region of Virginia to storm surge flooding under sea level rise. The hydrodynamic model was tidally calibrated with local tide gauges and then its performance in storm surge simulation was validated with the data from...
Technical Report
Full-text available
The goal of this technical review was to evaluate 1) the potential impacts of boat generated waves on shoreline stability and attendant ecosystem properties, and 2) policy options to minimize any adverse effects. We reviewed available literature, examined relevant data and information from Chesapeake Bay, discussed modeling approaches and highlight...
Conference Paper
Full-text available
Coastal wetlands are among the natural features with the capability to dissipate wave energy and reduce storm damage. Inadequate representation of wave and vegetation characteristics in numerical models may reduce their capability in predicting wave processes over wetlands. Previous numerical wave models have typically applied simplifications on ve...
Article
A new set of Boussinesq equations is derived to study the nonlinear interactions between long waves in a two-layer fluid. The fluid layers are assumed to be homogeneous, inviscid, incompressible, and immiscible. Based on the Boussinesq equations, an analytical model is developed using a second-order perturbation theory and applied to examine the tr...
Conference Paper
The preliminary results from a two-dimensional two-layer nonlinear shallow water model are presented. The system is composed of two inviscid, incompressible, and immiscible fluids of constant density. The waves are assumed to be nonlinear and non-dispersive and the water depth is assumed to be constant. A high order predictor-corrector algorithm wi...
Article
The development of a phase-resolving nonlinear frequency-domain model with both wave–current interaction and viscous mud-induced energy dissipation is discussed. The model is compared to dissipation rates deduced from experimental data, with favorable results. The model is then run with cnoidal waves over a finite mud patch with both opposing and f...
Article
Full-text available
A third-order asymptotic analysis is conducted to study the three-dimensional resonant interaction between a monochromatic progressive surface wave and two oblique interfacial waves in an open, lightly viscous, two-layer fluid of intermediate depth. By solving the evolution equations of the waves, the short- and long-term behaviors of the interfaci...
Article
Full-text available
The complex process of surface wave propagation over areas of cohesive sediments has generally been treated by assuming a particular rheological behavior for the mud layer, thereby fixing the description of the mud characteristics into the specification of parameters relevant to the selected rheology. The capability of inverting data to recover the...
Conference Paper
Ocean in deep waters and coastal areas is stratified due to vertical gradient of density. Due to nearly distinct interface between the layers of constant density, a two-layer system is a commonly used configuration to model ocean waters. In such models, various mechanisms can lead to generation of surface and interfacial waves. Furthermore, this sy...
Conference Paper
Full-text available
Transient evolution of interacting long nonlinear surface and interfacial waves are analyzed. A set of Boussinesq-like equations are derived for two layer, density stratified, shallow, inviscid and immiscible fluid. The influence of different parameters on the interaction such as density ratio of the layers, relative thickness of the layers, surfac...
Conference Paper
Resonant interaction between one surface wave and two oblique interfacial waves is analyzed in a three dimensional system of a finite-depth, two-layer fluid. A third order perturbation analysis is carried out to obtain the evolution equations of the waves amplitudes. Taking the waves amplitudes as the perturbation small parameter, the evolution equ...

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Projects

Projects (5)
Project
The overarching objective of this Critical Resilient Interdependent Infrastructure Systems and Processes (CRISP) research project is to create a novel decision support system denoted dMIST (Data-driven Management for Interdependent Stormwater and Transportation Systems) to improve management of interdependent transportation and stormwater infrastructure systems. dMIST is designed specifically to address the critical problem of recurrent flooding caused by sea level rise and more frequent intense storms. The City of Norfolk, Virginia, a national leader in addressing the sea level rise challenge, will collaborate with the research team and serve as the project testbed. With sea level rise and more frequent intense storms, streets in many cities now flood multiple times per year. Flooding of roadways has cascading impacts to other infrastructure systems that depend on the road network including emergency services. Solving the problem of flooded roadways requires new tools capable of analyzing stormwater, transportation, and other infrastructure as interdependent systems. dMIST will be a recommendation system for assisting municipal decision makers and stakeholders in day-to-day operations to mitigate the short-term impacts of road flooding occurrences. It will also offer decision makers novel ways of testing “what if” scenarios that stretch across interdependent infrastructure systems in order to guide how large investments are used to adapt infrastructure systems to a more resilient future state. The core intellectual merit of this research is the advancement of a novel modeling and control framework called Data Predictive Control (DPC) for assisting decision makers in understanding and managing interdependent critical infrastructure systems (ICIs).
Project
The aim of this project is to quantify the effect of nature-based measures in reducing wave energy. The methods include field measurements and numerical modeling.