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Showing 1 to 20 of 97 for “"levees"”.
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Advanced Undersepage Analyses for Levees
… studies to identify the failure mechanisms of levees and I-walls. This involves updating of the current USACE Engineering Manual (EM) 1110-2-1913, "Design and Construction of Levees," which uses Blanket Theory for seepage analysis. Blanket Theory entails analytical methods for calculating …
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Analysis of Transient Seepage Through Levees
Levees are a significant part of the United States flood protection infrastructure. It is estimated that over 100,000 miles of levees exist in the United States. Most of these levees were designed many years ago to protect farmland and rural areas. As growth continues in the United States, many of …
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Levees, Urbanization and Public Perception: Implications for Southeast Louisiana Wetlands
… With the construction of the Mississippi River levees and increased urbanization the wetlands are quickly disappearing, thus leaving the area vulnerable to hurricane storm surge. Since Hurricane Katrina, levees have been showcased as the only way of fully protecting southeast Louisiana from …
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DESIGN METHODS FOR PRESSURE RELIEF WELL SYSTEMS AT DAMS AND LEVEES
… risk reduction structures such as dams and levees are important systems that provide significant benefits to the nation. Relief wells reduce the substratum water pressures that can compromise them via internal erosion. The U.S. Army Corps of Engineers (USACE) analytical method to design …
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Seismic Tomography for the Integrity Assessment of Earthen Dams and Levees.
Dams are a vital part of a nation's infrastructure. Considering the fact that many of the dams in the United States have approached or are approaching their projected life expectancy of 50 years, these critical infrastructures represent a risk to public safety. Minimizing this risk requires an …
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MPM Modeling of Internal Collapse Under Levees Caused by Underground Openings
… collapse in earth-retaining structures, such as levees, is essential for ensuring their stability and safety. This study investigates the mechanics of underground trapdoor collapse in frictional and cohesive soils, which is relevant to the behavior of water-retaining structures like levees, e.g., …
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Transient Seepage Analysis for Levees and Dams: Numerical and Monitoring Approaches
… the progression of the wetting front in the levees. Accounting for the increase in shear strength due to the presence of matric suction resulted in minimal impacts to stability factors of safety for levee embankments during flood loadings. The results of this investigation will help to …
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Investigation by models of the effect of internal drainage on the economical design of earth levees
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1938.
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Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms
… surrounding. Geophysical anomalies in dams and levees can be due to the overall heterogeneity of the subsurface, structures such as principal spillways, artifacts of inversion software, or to a true compromised location, such as an air void due to internal erosion or seepage. Therefore, there is …
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Stability of Levees and Floodwalls Supported by Deep-Mixed Shear Walls: Five Case Studies in the New Orleans Area
… methods (DMM) to improve the stability of levees constructed on soft ground is driven by the need to reduce levee footprints and environmental impacts and to allow for more rapid construction. Suitable methods for analysis and design of these systems are needed to ensure that the DMM …
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Vertical and Lateral Facies Architecture of Levees and Their Genetically-Related Channels, Isaac Formation, Neoproterozoic Windermere Supergroup, Cariboo Mountains, B.C.
… rich in residual carbon suggesting that mid-fan levees can serve as source rocks for hydrocarbon generation, and also reservoirs.
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A GIS-Based Strategy for Managing Levee Simulation Data
… and improving the state of the nation's levees has become a national priority following the devastating events surrounding Hurricanes Katrina and Rita. Federal legislation passed in 2007 created a new national Committee on Levee Safety and spurred the development of the National Levee …
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Examination of the impact of the natural environment on levee sustainability, An
Artificially constructed levees provide a series of valuable services including flood protection, tidal protection, and fresh water storage. Extending the life and status of levees reduces the potential for levee failures and enhances their benefits. The objective of this study was to improve our …
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Quantifying turbidity current interactions with topography
… between turbidity currents and channel-bounding levees. Levees are the primary elements of self-formed channels and act to confine flows within channels, thereby increasing transport efficiency. I quantify the morphology and growth of levees in a submarine channel network offshore Borneo. Levee …
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Levee Breach by Overtopping: The Effects of Soil Properties
<p>Levees are constructed for protecting infrastructure, croplands and cities from seasonal floods of low land rivers. Most levees are constructed from earthen materials. Also known as earthen embankments, these levees may fail by overtopping, when flood levels exceed design floods. Past studies …
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Morphological filters in floodplain for DEM-extracted data – using Minimum Bounding Circle & Youden Index
… initiatives. As the first defense line, levees provide protection from temporary flooding (Makhdoom, 2013). These embankments are broadly classified according to the areas they protect, which could either be urban or agricultural levees within floodplains. In the U.S., most of the levees …
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Effetti dell'attività della fauna sulla stabilità degli argini: Valutazione Ecoidraulica dei meccanismi di rottura arginale e tecniche di ripristino
… types of river structures to control the flow. Levees (also known as dikes), for instance, are simply man-made embankments built to keep a river from overflowing its banks. However, river flooding is a natural phenomenon so that it is not rare that rivers overflow their banks and flood the …
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HYDRAULIC, GEOSPATIAL, AND SOCIOECONOMIC MODELING OF STRATEGIC FLOODPLAIN RECONNECTION TRADEOFFS ALONG THE LOWER TISZA RIVER (HUNGARY) AND LOWER ILLINOIS RIVER (ILLINOIS, U.S.A)
… systems were largely disconnected by levees, facilitating "reclamation" for agriculture and resulting in an estimated loss of over 90% of historical wetlands. While levees have been successful in preventing catastrophic flooding for a century, Lower Tisza flood stages continue to rise …
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Population Ecology and Foraging Behavior of Breeding Birds in Bottomland Hardwood Forests of the Lower Roanoke River
… Warblers was similar in narrow and wide levees; nest success of Northern Cardinals was greater in narrow levees. Results of my study indicate that edge effects are not universal, and that amount of contrast at edges may interact with landscape context to alter ecological processes, such …
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