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2011

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Measurement Of Spatial Variation Of Density Of Compacted Powder Using Synchrotron Microtomography, Yi Yang Jan 2011

Measurement Of Spatial Variation Of Density Of Compacted Powder Using Synchrotron Microtomography, Yi Yang

LSU Master's Theses

This research considers density change in powder metallurgy when compacting a powder blend in a die. In order to provide insights into particle behavior during compaction, atomized aluminum powders with an average particle size of 100 µm were used in two different compaction configurations. The compaction dies are cylindrical in shape: compaction configuration I displays an upper punch, a die, a lower punch, and a spacer. Compaction configuration II displays an upper punch, two dies, a lower punch, and a spacer with different geometry. The Synchrotron Microtomography scans were conducted on both compaction configurations. For compaction configuration I, the scan …

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The Effect Of In-School Opera Performance And Related Curriculum On Music Cognition And Attitude, Sara Harris Baker Jan 2011

The Effect Of In-School Opera Performance And Related Curriculum On Music Cognition And Attitude, Sara Harris Baker

LSU Doctoral Dissertations

This study was designed to compare knowledge about and attitude toward opera in three groups of fifth-graders with various levels of involvement with an in-school opera. One group watched the live performance, a second group watched the performance preceded by three pre-performance lessons that encompassed common opera vocabulary and voice types, and a third group experienced the lessons, the performance, and a five-lesson creative project in which they constructed their own opera. All students completed cognitive and attitude pretests and post-tests. ANCOVA analyses accounted for differences in scores on the pretests. Significant differences (p < .05) on the multiple-choice portion of the cognitive exam were found between the performance-only group and the performance plus instruction groups. Significant differences were found between the groups on the concept map portion of the cognitive measure, with the differences coming between the performance only group and the performance plus lessons group. Significant differences were found between each of the groups for a Likert-scale attitude measure, with the performance and lessons group posting the largest increases. In addition, a significant correlation was found between cognitive scores and attitude scores. Responses to semi-structured interviews suggested that students’ opinions of Opera were influenced by factors related to music, factors related to production, and factors related to personal perceptions.

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Response Of Disturbance-Dependent Breeding Bird Communities To Two Site Preparations In Loblolly Pine Plantations, Falyn Leann Owens Jan 2011

Response Of Disturbance-Dependent Breeding Bird Communities To Two Site Preparations In Loblolly Pine Plantations, Falyn Leann Owens

LSU Master's Theses

Disturbance-dependent birds throughout the United States have recently experienced significant declines due to fire suppression and conversion of wilderness to human-dominated landscapes. In Louisiana, young loblolly pine plantations are an important source of early- successional habitat for these specialist birds. However, changes in management practices may affect forest stand suitability for bird communities that rely on them. Here I examined how changes in two site preparations, tree row spacing [14 ft (4.3 m) vs. 20 ft (6.1 m)] and arrangement of post-harvest woody debris (piled vs. scattered), impacted breeding, disturbance- dependent birds. During four summers in 2006-2010, observers conducted point …

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An Euler Solver For Nonlinear Water Waves Using A Modified Staggered Grid And Gaussian Quadrature Approach, Qi Fan Jan 2011

An Euler Solver For Nonlinear Water Waves Using A Modified Staggered Grid And Gaussian Quadrature Approach, Qi Fan

LSU Master's Theses

A structured, finite-volume Euler solver for non-hydrostatic, free surface flows is developed to simulate coastal nonlinear dispersive water waves. A semi-implicit projection method which splits the pressure term into hydrostatic and non-hydrostatic parts is employed. A vertically shifted, staggered grid is designed to accommodate a new Gaussian discharge calculator and to facilitate the enforcement of a non-hydrostatic free-surface boundary condition. The Gaussian discharge calculator on the shifted grid increases the dispersion accuracy compared to traditional approaches that calculate discharges on a regular staggered grid. Numerical results are presented to demonstrate the improvements of these methods.

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Communication-Constrained Feedback Stability And Multi-Agent System Consensusability In Networked Control Systems, Laurentiu Dan Marinovici Jan 2011

Communication-Constrained Feedback Stability And Multi-Agent System Consensusability In Networked Control Systems, Laurentiu Dan Marinovici

LSU Doctoral Dissertations

With the advances in wireless communication, the topic of Networked Control Systems (NCSs) has become an interesting research subject. Moreover, the advantages they offer convinced companies to implement and use data networks for remote industrial control and process automation. Data networks prove to be very efficient for controlling distributed systems, which would otherwise require complex wiring connections on large or inaccessible areas. In addition, they are easier to maintain and more cost efficient. Unfortunately, stability and performance control is always going to be affected by network and communication issues, such as band-limited channels, quantization errors, sampling, delays, packet dropouts or …

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Geomicrobiology Of Louisiana Coastal Marshes Before And After The Deepwater Horizon Oil Spill, Chang Liu Jan 2011

Geomicrobiology Of Louisiana Coastal Marshes Before And After The Deepwater Horizon Oil Spill, Chang Liu

LSU Master's Theses

The 2010 Deepwater Horizon oil spill in the Gulf of Mexico not only impacted open ocean and shoreline geochemical and ecological environments, but it served to promote research of microbial ecosystems in poorly studied habitats, such as Louisiana marshes. Sediment and water samples from four main marshes in southern Louisiana were collected in May 2010 (pre-oil), September 2010 (oiled), and June 2011 (post-oil). Sites near the Mississippi River had exceptionally low salinity in the immediate months following the oil spill due to freshwater diversion efforts; salinity increased by an order of magnitude one year later. Microbial diversity was evaluated from …

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Non-Mass Dependent Isotope Fractionation: An Application In The Hyperarid Environment And A Set Of Experiments On Thermal Diffusion, Tao Sun Jan 2011

Non-Mass Dependent Isotope Fractionation: An Application In The Hyperarid Environment And A Set Of Experiments On Thermal Diffusion, Tao Sun

LSU Doctoral Dissertations

This dissertation consists of two independent topics; both are related to non-mass dependent isotope fractionation. 1) Atacama Gravel Sulfate: The onset of hyperaridity of Atacama Desert is of geological importance and has been controversial. I put constraints this timing by looking into a new record, a deep sulfate profile extending from the surface down to the oxide zone of a copper ore in the Atacama Gravels, whose deposition covers a majority of the Central Depression and temporarily spans from semi-arid to hyper-arid climate. The gravel sulfates show a strong depth-dependent pattern through ~50 meters (15 to 65 meter depth): narrow …

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Student Problem Solving Communication Processes While Completing Multimedia Case Studies: A Look Into The Relationship Among Levels Of Collaboration, Problem Solving Processes, And Problem Solving Performance On Individual And Group Levels, Jan Elizabeth Broussard Jan 2011

Student Problem Solving Communication Processes While Completing Multimedia Case Studies: A Look Into The Relationship Among Levels Of Collaboration, Problem Solving Processes, And Problem Solving Performance On Individual And Group Levels, Jan Elizabeth Broussard

LSU Doctoral Dissertations

In an effort to better prepare students to become productive members of the work force, educators must grant students the opportunities to become critical thinkers. Students need to be able to learn to inquire, create, and think critically in order to obtain meaningful information from the abundance of knowledge that is accessible to them through the Internet and the World Wide Web. This quasi-experimental study examined the effects of online collaborative problem solving processes during a multimedia case study. Sixty-one students in two undergraduate management information systems classes agreed to participate. The experimental class, section 01, was required to use …

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Integrated Modular Microfluidic System For Forensic Alu Dna Typing, Samuel Kimani Njoroge Jan 2011

Integrated Modular Microfluidic System For Forensic Alu Dna Typing, Samuel Kimani Njoroge

LSU Doctoral Dissertations

Driven by the numerous applications of genome-related research, fully integrated microfluidic systems have been developed that have advanced the capabilities of molecular and, in particular, genetic analyses. A brief overview on integrated microfluidic systems for DNA analysis is given in Chapter 1 followed by a report on micro-capillary electrophoresis (µCE) of Alu elements with laser-induced fluorescence (LIF) detection, in which the monomorphic Alu insertions on the X and Y chromosomes were utilized to detect male DNA in large female DNA background (Y: X = 1:19) without cell sorting prior to the determination. The polymorphic Alu loci with known restricted geographical …

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Improving The Characterization Of Initial Condition For Ensemble Streamflow Prediction Using Data Assimilation, Caleb Matthew Dechant, Hamid Moradkhani Jan 2011

Improving The Characterization Of Initial Condition For Ensemble Streamflow Prediction Using Data Assimilation, Caleb Matthew Dechant, Hamid Moradkhani

Civil and Environmental Engineering Faculty Publications and Presentations

Within the National Weather Service River Forecast System, water supply forecasting is performed through Ensemble Streamflow Prediction (ESP). ESP relies both on the estimation of initial conditions and historically resampled forcing data to produce seasonal volumetric forecasts. In the western US, the accuracy of initial condition estimation is particularly important due to the large quantities of water stored in mountain snowpack. In order to improve the estimation of snow quantities, this study explores the use of ensemble data assimilation. Rather than relying entirely on the model to create single deterministic initial snow water storage, as currently implemented in operational forecasting, …

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Delivery Accuracy Of Image Guided Radiation Therapy Using Elekta Infinity's On-Board Imaging, Matthew William Sutton Jan 2011

Delivery Accuracy Of Image Guided Radiation Therapy Using Elekta Infinity's On-Board Imaging, Matthew William Sutton

LSU Master's Theses

Using the technique developed by Vinci et al. (2007), this project quantified the accuracy and precision of the Elekta Infinity using an end-to-end test for the entire image guided radiation therapy (IGRT) treatment process. The IGRT capabilities of the on-board imaging systems for megavoltage (MV) planar imaging and kilovoltage cone beam computed tomography (kVCBCT) were both evaluated. The accuracy of the on-board imaging systems will impact the size of planning treatment margins. A CIRS Radiosurgery head phantom with a Gafchromic EBT2 film dosimetry block insert was used to measure the dose distributions in the three orthogonal planes. A coplanar, isocentric, …

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Twisted Frobenius-Schur Indicators For Hopf Algebras, Maria Vega Jan 2011

Twisted Frobenius-Schur Indicators For Hopf Algebras, Maria Vega

LSU Doctoral Dissertations

The classical Frobenius--Schur indicators for finite groups are character sums defined for any representation and any integer $m\ge 2$. In the familiar case $m=2$, the Frobenius--Schur indicator partitions the irreducible representations over the complex numbers into real, complex, and quaternionic representations. In recent years, several generalizations of these invariants have been introduced. Bump and Ginzburg in 2004, building on earlier work of Mackey from 1958, have defined versions of these indicators which are twisted by an automorphism of the group. In another direction, Linchenko and Montgomery in 2000 defined Frobenius--Schur indicators for finite dimensional semisimple Hopf algebras. In this dissertation, …

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Marriage In Seventeenth-Century French Theater, Adam Michael Babin Jan 2011

Marriage In Seventeenth-Century French Theater, Adam Michael Babin

LSU Master's Theses

In seventeenth-century France, social and political confusion abounded. Absolute monarchy, which was principally created by Richelieu and glorified by Louis XIV, began gradually replacing the medieval feudalism that remained popular among the nobles. Likewise, préciosité, a proto-feminist literary and cultural movement that was not in line with official political ideals, emerged in France during this century. The institution of marriage was an important element of the complicated sociopolitical tapestry of seventeenth-century France. Through the depiction of marriage in Pierre Corneille’s Le Cid (1636), Jean-Baptiste Poquelin de Molière’s L’École des femmes (1662), and Jean Racine’s Andromaque (1667), three works of the …

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Improving Math Instruction In Schools That Serve The Poor, John, L. Jr. Sims Jan 2011

Improving Math Instruction In Schools That Serve The Poor, John, L. Jr. Sims

LSU Master's Theses

Public alarm concerning how well U.S. schools are performing in mathematics compared to other developed nations is increasing. Reports of inadequate teaching, poor curriculum design, and low performance on standardized test have been fueled by the media. These issues in American mathematics classrooms are far compounded in schools that serve the poorest in America. When comparing mathematical proficiency rates of U.S. schools with other countries, schools with less than 25% free and reduced lunch score competitively with counterparts in other countries. In contrast, schools with rates of free and reduced lunch higher than 50% score dismally in comparison. Conditions such …

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Replenishment Policies For A Tree-Type Three Echelon Supply Chain System, Ratkrit Rochanaluk Jan 2011

Replenishment Policies For A Tree-Type Three Echelon Supply Chain System, Ratkrit Rochanaluk

LSU Master's Theses

One of the common goals which most companies have is to maximize profits. There are two way to increase profit: increasing revenue or reducing cost. Lacking of ability to keep the cost down could potentially drive the companies out of the business. In recent years, many researchers have been paying more attention on improving supply chain system due to high potential of creating cost savings. The supply chain network considered in this research is a tree-type, three-echelon single producer, multiple distributors, and multiple retailers system. The goal of this research is to develop a replenishment policy which satisfies customers’ demand …

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The Effect Of Habitat Change On Nutrient Removal In The Atchafalaya River Basin, Louisiana, Amy E. Scaroni Jan 2011

The Effect Of Habitat Change On Nutrient Removal In The Atchafalaya River Basin, Louisiana, Amy E. Scaroni

LSU Doctoral Dissertations

The Mississippi and Atchafalaya rivers are the major sources of freshwater and nutrients to the Gulf of Mexico. Increased nutrient loads from these rivers exacerbate eutrophication in coastal receiving waters and contribute to the large area of hypoxia that develops seasonally in the Gulf. Levees along the Mississippi River have reduced contact between the river and the historic floodplain; this limits the ability of floodplain wetlands to naturally mitigate excess nutrients. However, the Atchafalaya River diverges from the Mississippi 217 km from the Gulf and enters a large river floodplain with a widely spaced levee system. This enhances the ability …

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Modeling The Population Effects Of Hypoxia On Atlantic Croaker (Micropogonias Undulatus) In The Northwestern Gulf Of Mexico, Sean Brandon Creekmore Jan 2011

Modeling The Population Effects Of Hypoxia On Atlantic Croaker (Micropogonias Undulatus) In The Northwestern Gulf Of Mexico, Sean Brandon Creekmore

LSU Master's Theses

The northwestern Gulf of Mexico currently experiences a large hypoxic area (“dead zone”) during the summer. While the local effects of hypoxia on organisms have been documented, the population-level effects are largely unknown. I developed a spatially-explicit, individual-based model to analyze how hypoxia effects on Atlantic croaker reproduction, growth, and mortality in the northwestern Gulf of Mexico could lead to population-level responses. The model follows the hourly growth, mortality, reproduction, and movement of individuals on a 300 x 800 spatial grid of 1 km2 cells for 100 years. Chlorophyll-a concentration, water temperature, and dissolved oxygen were specified daily for each …

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The Relationship Between Music And Visual Arts Formal Study And Academic Achievement On The Eighth-Grade Louisiana Educational Assessment Program (Leap) Test, Richard Allen Baker Jr. Jan 2011

The Relationship Between Music And Visual Arts Formal Study And Academic Achievement On The Eighth-Grade Louisiana Educational Assessment Program (Leap) Test, Richard Allen Baker Jr.

LSU Doctoral Dissertations

The purpose of this study was to examine the policy implications allowing administrators to exempt a student from required arts instruction if the student obtained unsatisfactory scores on the high-stake state mandated tests in English and mathematics. This study examined English language arts and math test scores for 37,222 eighth grade students enrolled in music and/or visual arts classes and those students not enrolled in arts courses. There were more than 12,000 students who were eligible, but not enrolled in arts courses. Methodology consisted of comparing the mean scores of students receiving music and visual arts instruction with the mean …

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Teaching High School Geometry With Tasks And Activities, Margaret Ann Fazekas Jan 2011

Teaching High School Geometry With Tasks And Activities, Margaret Ann Fazekas

LSU Master's Theses

Task-based learning is an instructional method in which students complete coherently-structured activities in order to meet objectives set by the educator. This thesis illustrates learning communities as the ideal environment for a task-based learning classroom. It discusses the teacher’s role in a task-based classroom. This paper also describes three examples of tasks performed in my high school geometry classroom along with my observations of students’ interactions and discussions.

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A C0 Interior Penalty Method For The Von Kármán Equations, Armin Karl Reiser Jan 2011

A C0 Interior Penalty Method For The Von Kármán Equations, Armin Karl Reiser

LSU Doctoral Dissertations

In this dissertation we develop a C0 interior penalty method for the von Kármán equations for nonlinear elastic plates. We begin with a brief survey on frequently used finite element methods for the von Kármán equations. After addressing some topics from functional analysis in the preliminaries, we present existence, uniqueness and regularity results for the solutions of the von Kármán equations in Chapter 3. In the next chapter we review the C0 interior penalty method for the biharmonic problem. Motivated by these results, we propose a C0 interior penalty method for the linearized von Kármán equations in …

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Stay Calm And Tweet: A Best Practice Approach To The Use Of Social Media In A Crisis Situation, Elizabeth Barrow Tadie Jan 2011

Stay Calm And Tweet: A Best Practice Approach To The Use Of Social Media In A Crisis Situation, Elizabeth Barrow Tadie

LSU Master's Theses

At some point in its history every organization will face a crisis situation. How an organization responds to a crisis incident decides its survival. As Internet technology flourishes, public relations practitioners are provided with additional tools to manage crisis situations. This study investigates the role that emerging social media components play in the field of crisis management. It presents a best practice approach to using new technology in times of emergency. A qualitative study of Louisiana public relations practitioners analyzes how and why social media is being integrated into crisis communication plans. Social media components are used to quickly communicate …

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Analysis Of Major Hydrologic Events In Ascension Parish, La, Jessica Irene Mason Jan 2011

Analysis Of Major Hydrologic Events In Ascension Parish, La, Jessica Irene Mason

LSU Master's Theses

Ascension Parish is located in Southern Louisiana and is characterized by low slope and low elevation. This combination allows for much hydrologic storage during a flood event. Because Ascension Parish is one of the most rapidly growing areas in the United States, it is necessary to accurately predict the hydrologic and hydraulic properties of flow and accurately model them. Several processes within a hydrologic model greatly influence the output flow hydrographs so selecting correct methods and parameters is important. Transform methods describe how excess precipitation is transformed into runoff. There are several methods that can be used as a transform …

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Transport Properties Of Nanometer-Sized Assemblies Through Nanofluidic Channels With Single Entity Electrical Detection, Franklin Ifeanyichukwu Uba Jan 2011

Transport Properties Of Nanometer-Sized Assemblies Through Nanofluidic Channels With Single Entity Electrical Detection, Franklin Ifeanyichukwu Uba

LSU Master's Theses

Recently, there have been reports on biological and solid-state nanopores that identify single biopolymers or their constituent monomers by analyzing changes in ionic current blockades when they block the flux of buffer ions while travelling through the nanopores. Nevertheless, there have been several limitations in their application, especially as DNA detectors; Poor confinement of the DNA strand within the nanopore (~0.1 % of a 10 kilobase (kb) DNA), poor signal sensitivity and random motion experienced by the DNA in solution that results in a large amount of noise in the signal. These have led to the development of nanochannel-based devices, …

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Modeling Effects Of Coupled Convection And Co2 Injection In Stimulating Geopressured Geothermal Reservoirs, Tatyana Plaksina Jan 2011

Modeling Effects Of Coupled Convection And Co2 Injection In Stimulating Geopressured Geothermal Reservoirs, Tatyana Plaksina

LSU Master's Theses

Geopressured geothermal brines are a vast geothermal resource in the US Gulf of Mexico region. In particular, geopressured sandstones near salt domes are potential sources of geothermal energy because salt diapirs with high thermal conductivities may pierce younger, cooler strata. These characteristics enhance transfer heat from older, hotter strata at the base of the diapir into shallower strata. Moreover, widespread geopressure in the Gulf region tends to preserve permeability, enhancing productivity. As an example, the Camerina A sand of South Louisiana was chosen as a geomodel for a numerical simulation study of effects of CO2 injection and coupled convection as …

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Proteomic Analysis Of The Blood Of Alligator Mississippiensis, Lancia Nadinia Fallen Darville-Bowleg Jan 2011

Proteomic Analysis Of The Blood Of Alligator Mississippiensis, Lancia Nadinia Fallen Darville-Bowleg

LSU Doctoral Dissertations

My research focus was to investigate alligator blood using mass spectrometry-based proteomics methods to understand their innate immune systems. The first goal was to sequence peptides and proteins from the blood serum and leukocytes using tandem mass spectrometry and de novo sequencing. The second goal was to determine the function of these biological molecules and their relationship to the immune system. One- and two-dimensional gel electrophoresis was used to separate proteins from alligator leukocytes, which were enzymatically digested. The peptides were measured using reversed phase nano-high performance liquid chromatography coupled with tandem mass spectrometry (nano-HPLC-MS/MS) followed with de novo sequencing. …

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Miscible Column Studies Of Unfractured And Saturated Cores Of Topopah Spring Tuff From Yucca Mountain, Nevada Using Hydrophobic Organic Pollutants, Kody V. Kramer Jan 2011

Miscible Column Studies Of Unfractured And Saturated Cores Of Topopah Spring Tuff From Yucca Mountain, Nevada Using Hydrophobic Organic Pollutants, Kody V. Kramer

LSU Master's Theses

Miscible displacement column studies were conducted on unfractured cores of Topopah Spring Tuff to quantify transport characteristics of bromide&44; pentafluorobenzoic acid &40;PFBA&41;&44; trichloroethylene &40;TCE&41;&44; and naphthalene. Three 5 cm diameter by 2 cm long cores were flushed with pulses of simulated groundwater containing these tracers&44; followed by tracer&45;free solution. Effective porosities were gravimetrically measured as 11&37;&44; 10.6&37;&44; and 9.5&37;. The tracers achieved full breakthrough in an order correlating to their hydrophobicities. Bromide and PFBA sorbed least&44; achieving full breakthrough in fewer than 10 pore volumes. As water analogues&44; both exhibited no quantifiable sorption. Delay to full breakthrough was contributed to …

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Evaluation Of Selected Plant Products As Dietary Protein Sources For Florida Pompano (Trachinotus Carolinus), Gregory Lech Jan 2011

Evaluation Of Selected Plant Products As Dietary Protein Sources For Florida Pompano (Trachinotus Carolinus), Gregory Lech

LSU Master's Theses

Profitability of aquaculture enterprises worldwide has been affected by rising fish meal prices. Plant proteins are promising replacements for fish meal because of their lower cost and worldwide availability. The goal of this research was to provide nutritional information for the development of all-plant diets for Florida pompano by evaluating growth of fish fed soy-based, fish-meal-free diets and assessing the nutritional value of several plant protein sources. In the first experiment, juvenile Florida pompano were fed five, soy-based, fish-meal-free diets containing graded levels of soybean meal (SBM, or M) at 0, 20, 25, 30, or 35%, with the remaining protein …

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Temporal Changes Of Coastal Community Resilience In The Gulf Of Mexico Region, Kenan Li Jan 2011

Temporal Changes Of Coastal Community Resilience In The Gulf Of Mexico Region, Kenan Li

LSU Master's Theses

The Gulf of Mexico Region is a region where coastal hazards are frequently occurring. To study the resilience of the counties along the Gulf of Mexico is of great importance to its sustainable planning and development. It also plays a huge role in coastal hazard mitigation. This study assesses the temporal changes of coastal community resilience of 132 counties along the Gulf of Mexico. The basic analytical framework to assess resilience consists of three dimensions (exposure, damage, and recovery) and two relationships (vulnerability and adaptability). Vulnerability refers to the relationship between exposure and damage, whereas the relationship between damage and …

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Stage Specific Cotton Water Use Crop Coefficients In Northeast Louisiana, Vipan Kumar Jan 2011

Stage Specific Cotton Water Use Crop Coefficients In Northeast Louisiana, Vipan Kumar

LSU Master's Theses

Cotton (Gossypium hirsutum L.) is an important commercial crop in the northeastern part of Louisiana. Research-based information for irrigation scheduling in cotton is lacking in this region. A two-step reference evapotranspiration (ETo) - cotton crop coefficient (Kc) approach is considered a standard method of crop water use (ETc) estimation. Therefore, a study was conducted to determine stage-specific cotton water use crop coefficients (Kc), a ratio of ETc to ETo at the LSU AgCenter Northeast Research Station in 2010. For ETc estimation, paired weighing lysimeters were used. Cotton variety ‘Stoneville 5458 B2RF’ was planted on weighing lysimeters by hands and surrounding …

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Investigation Into The Cause Of Earthen Embankment Instability Along The "V-Line" Artificial Levee In Marrero, Louisiana, Usa, Jason Hicks Jan 2011

Investigation Into The Cause Of Earthen Embankment Instability Along The "V-Line" Artificial Levee In Marrero, Louisiana, Usa, Jason Hicks

LSU Master's Theses

The “V-line” levee, located in Marrero, LA, has a crack along its crest, measuring approximately 100 meters in length, 30 centimeters in depth, and 30 centimeters in width. This crack is a sign of levee instability. Seismic shear wave, CPT, and laboratory shear strength data were collected and processed to identify the cause of the instability. A zone of low seismic shear wave velocity was interpreted approximately 3 meters deep from the berm of the levee. Because of the large spacing between laboratory shear strength test sampling and CPT sites, a similar zone of low shear strength was not found …

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