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The secondary consolidation (creep) due to geohistorical overburden pressure in the Houston-Galveston region, Texas

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doi: 10.5194/piahs-382-315-2020
Authors:Liu, Yi; Li, Jiang; Fang, Zheng N.; Rashvand, Mojtaba; Griffin, Tranell
Author Affiliations:Primary:
Morgan State University, Civil Engineering Department, Baltimore, MD, United States
Deltares Research Institute, Netherlands
University of Texas at Arlington, United States
Volume Title:Subsidence and society
Volume Authors:Fokker, Peter A., editor; Erkens, Gilles
Source:Proceedings - International Association of Hydrological Sciences, Vol.382, p.315-320; Tenth international symposium on Land subsidence; living with subsidence, Delft, Netherlands, May 17-21, 2021, edited by Peter A. Fokker and Gilles Erkens. Publisher: Copernicus Publications for International Association of Hydrological Scientists (IAHS), Gottingen, Germany. ISSN: 2199-8981
Publication Date:2020
Note:In English. 20 refs.; illus.
Summary:The combination of groundwater withdrawal, hydrocarbon extraction, salt-dome movement and faulting have caused widespread subsidence in the Houston-Galveston region (HGR). Subsidence results from primary consolidation consisting of inelastic (nonrecoverable) and elastic (recoverable) compaction caused by subsurface fluid withdrawal and secondary consolidation (creep) over time caused by overburden pressure. Subsidence in the HGR is monitored using borehole extensometers that were installed at 13 locations across Harris and Galveston counties between 1962 and 1980. By 1977, withdrawals from the Chicot and Evangeline aquifers resulted in groundwater-level declines of about 114 and 115 m relative to predevelopment water levels, respectively in parts of Harris County. By 1979, as much as 3 m of land subsidence was estimated to have occurred in localized areas of the HGR. Land subsidence can be hazardous in populated areas because it exacerbates the effects of storm surge and impedes storm-water runoff by decreasing land-surface elevations in areas where water accumulates. To assess aquifer compaction in response to changes in groundwater levels, a bulk land-surface subsidence rate is assumed to be the sum of the primary consolidation rate and the negligibly variable component of overburden pressure referred to as the "pseudo-constant secondary consolidation rate." From 1931 to 1976, groundwater levels decreased as groundwater withdrawal rates increased from 0.57 to 4.3 million mspan class="inline-formula"3/span dspan class="inline-formula"-1/span, causing pressure heads in aquitards the Chicot and Evangeline aquifers to continually decline. In response to reductions in groundwater withdrawal rates from 4.3 to 3.0 million mspan class="inline-formula"3/span dspan class="inline-formula"-1/span between 1976 and 2001, groundwater levels rebounded, decreasing inelastic compaction rates in some parts of the HGR from as much as about 40 mm yrspan class="inline-formula"-1/span in the early 1980s to negligible amounts by 2000. Inelastic consolidation from about 1937 to 2000 contributed to land-surface subsidence and its associated effects. Land-surfaces have rebounded in localized areas of the HGR where groundwater levels rebounded significantly. Pseudo-constant secondary consolidation rates were computed at each of the 13 extensometers and ranged from 0.48 to 8.49 mm yrspan class="inline-formula"-1/span in areas where groundwater levels in the two aquifers were stabilizing. This secondary consolidation subsidence is beyond the control of any groundwater-level management schemes because it is caused by geohistorical overburden pressure on the two aquifers.
Subjects:Aquifers; Compaction; Compressibility; Consolidation; Creep; Extensometers; Geologic hazards; Ground water; Land subsidence; Levels; Lithostatic pressure; Natural hazards; Pumping; Chicot Aquifer; Evangeline Aquifer; Galveston County Texas; Galveston Texas; Harris County Texas; Houston Texas; Texas; United States
Coordinates:N291700 N291700 W0944800 W0944800
N294500 N294500 W0952500 W0952500
Record ID:890501-53
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany
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