Doctoral Dissertations

Keywords and Phrases

ERT Technique; Geophysical Assessment; Karst; MASW; Pathways; Potential seepage

Abstract

"Since construction of the Lake Chesterfield, Missouri in 1986, significant leaks have occurred causing the lake to lose substantive volumes of water. Mitigation efforts, have not solved the problem. Indeed, in June of 2017, the water level in Lake Chesterfield dropped at an alarmingly rapid rate. Prior to authorizing additional mitigation work, the Lake Chesterfield. Home Owners Association (LCHOA) decided to acquire geophysical data across the drained and dry lake bed. These information would help a geotechnical engineering firm determine the most appropriate mitigation plan.

In the summer of 2018, electrical resistivity tomography, multichannel analysis of surface wave, and spontaneous-potential data were acquired across the dry lake bed. The interpretation of the geophysical data indicates the top of weathered bedrock in the study area. Bedrock in the study area can be subdivided into three layers: and upper weathered layer; a more intensely weathered layer and relatively intact rock.

The Lake Chesterfield earth-fill dam was constructed on the upper weathered layer of rock. The interpretation of the geophysical data suggests water leaks through this upper layer of rock and into the intensely weathered layer. The water then flows downstream to the north beneath the dam through three identified seepage pathways. These pathways should be further investigated. If they are effectively grouted, leakage of lake waters could be effectively minimized.

In the author's opinion, the most effective mitigation strategy would be to grout the porous permeable rock beneath the base of the dam"--Abstract, page iii.

Advisor(s)

Anderson, Neil L. (Neil Lennart), 1954-

Committee Member(s)

Rogers, J. David
Torgashov, Evgeniy V.
Liu, Kelly H.
Sneed, Lesley

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Geological Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2020

Pagination

x, 122 pages

Note about bibliography

Includes bibliographic references (pages 120-121).

Geographic Coverage

Lake Chesterfield, Missouri; Wildwood, Missouri; Saint Louis County, Missouri

Rights

© 2020 Diya Ali Ahmad Alfuqara, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11663

Electronic OCLC #

1164143466

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