Underseepage and its Control: A Symposium: Investigation of Underseepage - Mississippi River Levees

Turnbull, W. J.; Mansur, C. I.

doi:10.1061/taceat.0008148

Cited by 9 publications

(5 citation statements)

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Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 86%

“…The upper 40 m of sediments at our study area share the near-surface sedimentary facies common throughout the LMRV (Figure 3), which contains Holocene point bar channel deposits and associated abandoned channels [12,61]. Point bar sedimentary sequences are the product of the river's lateral accretion over time, developing highly vertical and horizontal heterogeneous soils in terms of grain size and composition [12,61]. The upper 10-m section of Mississippi point bars is often composed of interbedded sands, silts, and clays with preservation of the original accretionary dip angle and represents the inclination of the inner bank of the river channel bend [62].…”

Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 89%

“…Based on boring logs, the upper 10 m of the subsurface appear highly heterogeneous in composition (sand, silt, and clay) and variable in thickness. The tops of some of buried sandy/silt ridges lie within 1 to 3 m of the ground surface in some locations [12]. The general trend interpreted from the boring logs finds a top stratum that varies in thickness between 3 m and 10 m and is composed of a combination of fine sand, silt, and clay.…”

Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 95%

“…A suitable floodplain zone lies 25 m from the Mississippi River on the western edge of Louisiana State University in Baton Rouge, and at the northernmost point of the Duncan Point Bar (Figure 1a). We chose this site because it is publicly accessible for investigation and is historically prone to under-the-levee seepage and flooding [12]. During high stages in the Mississippi River, the building at the study location experiences seepage in its basement.…”

Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 99%

“…These earthen levees provide safety to major urban cities (e.g., Kansas City, St. Louis, Memphis, Vicksburg, Baton Rouge, and New Orleans) in the United States during seasonal flooding events [9]. The seasonal hydraulic head fluctuations in the Mississippi River incorporate pore pressure changes in the hydraulically connected aquifer below the protected side of artificial levees [8,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Seepage-Induced Pore Pressure Variations Beneath an Earthen Levee Measured with a Novel Seismic Tool

Locci-Lopez

Lorenzo

2023

Geosciences

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Shear-wave seismic reflection velocity-versus-depth models can complement our understanding of seepage pore pressure variations beneath earthen levees at locations between geotechnical sites. The seasonal variations of water level in the Mississippi River create pore pressure changes in the adjacent hydraulically connected aquifer on the protected side of artificial levees. Time-lapse shear-wave velocity analysis or repetition of seismic acquisition over an area is a non-invasive method that can detect seasonal pore pressure variations in shallow (<40 m) aquifers. The seismic reflection patterns during the seasonal pore pressure variations of the river show a distinctive change in the velocity semblance analysis, which is translated as a change in the average stress carried by the grain-to-grain contact, or simply the effective pressure. The seismic data show a greater variation of up to +140/−40 m/s or +700/−150 kPa in the confined aquifer zone, compared with the leaky confined aquifer zone of up to +46/−48 m/s or +140/−80 kPa. These relative effective pressure characteristics allow us to distinguish between confined and leaky aquifers and can be an optional approach for pressure prediction in floodplains along levees without the need to drill borings in the area to measure piezometric data.

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Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 86%

Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 89%

Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 95%

Section: Geological and Geotechnical Setting Of The Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seepage-Induced Pore Pressure Variations Beneath an Earthen Levee Measured with a Novel Seismic Tool

Locci-Lopez

Lorenzo

2023

Geosciences

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Risk‐based planning analysis for a single levee

Hui

Jachens

Lund

2016

Water Resources Research

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Traditional risk‐based analysis for levee planning focuses primarily on overtopping failure. Although many levees fail before overtopping, few planning studies explicitly include intermediate geotechnical failures in flood risk analysis. This study develops a risk‐based model for two simplified levee failure modes: overtopping failure and overall intermediate geotechnical failure from through‐seepage, determined by the levee cross section represented by levee height and crown width. Overtopping failure is based only on water level and levee height, while through‐seepage failure depends on many geotechnical factors as well, mathematically represented here as a function of levee crown width using levee fragility curves developed from professional judgment or analysis. These levee planning decisions are optimized to minimize the annual expected total cost, which sums expected (residual) annual flood damage and annualized construction costs. Applicability of this optimization approach to planning new levees or upgrading existing levees is demonstrated preliminarily for a levee on a small river protecting agricultural land, and a major levee on a large river protecting a more valuable urban area. Optimized results show higher likelihood of intermediate geotechnical failure than overtopping failure. The effects of uncertainty in levee fragility curves, economic damage potential, construction costs, and hydrology (changing climate) are explored. Optimal levee crown width is more sensitive to these uncertainties than height, while the derived general principles and guidelines for risk‐based optimal levee planning remain the same.

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Partially penetrating multiple-well syste in a confined aquifer with application to a relief well design

Sharma¹

1974

Journal of Hydrology

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Underseepage and its Control: A Symposium: Investigation of Underseepage - Mississippi River Levees

Cited by 9 publications

References 0 publications

Seepage-Induced Pore Pressure Variations Beneath an Earthen Levee Measured with a Novel Seismic Tool

Seepage-Induced Pore Pressure Variations Beneath an Earthen Levee Measured with a Novel Seismic Tool

Risk‐based planning analysis for a single levee

Partially penetrating multiple-well syste in a confined aquifer with application to a relief well design

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