A Review of Subsidence Measurements near Mendota, California

Mastin, Tom; Styles, Stuart W.; Feist, Kyle

doi:10.1061/9780784481400.005

Cited by 2 publications

(1 citation statement)

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Land subsidence, caused by groundwater extraction and subsequent subsurface compaction, is an issue of global concern 1,2 . Since the 1920s, there have been numerous periods of subsidence in California's San Joaquin Valley leading to widespread sinking of the land surface which has locally exceeded 9 m [3][4][5] . The most recent period of severe subsidence, which was triggered by the 2012-15 drought, is now causing damage which threatens the long-term viability of critical water distribution infrastructure in the Valley 6,7 .

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Modeling 65 Years of Land Subsidence in California’s San Joaquin Valley

Lees

Knight²,

Smith

2021

Preprint

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[copied directly from first paragraph of paper] Land subsidence, caused by groundwater extraction and subsequent subsurface compaction, is an issue of global concern. Since the 1920s, there have been numerous periods of subsidence in California’s San Joaquin Valley leading to widespread sinking of the land surface which has locally exceeded 9 m. The most recent period of severe subsidence, which was triggered by the 2012-15 drought, is now causing damage which threatens the long-term viability of critical water distribution infrastructure in the Valley. However, there is neither a continuous monitoring record of the subsidence nor high-quality records of the hydrologic head changes in the subsurface which have caused the subsidence, making it impossible to understand, and thus mitigate, the subsidence. Here, we leverage subsidence and hydraulic head data from a variety of sources to create and validate a one-dimensional model of subsurface compaction and subsidence over the 65 years between 1952-2017. This model, which simulated up to 7.5 m of subsidence since 1952, provides a complete record of subsidence in our study region by filling crucial gaps in the observed record. Our model reveals the long-term processes causing subsidence, which operated over decades-to-centuries and caused exceptionally high rates of baseline subsidence in 2017, resulting in a critical risk of future subsidence. This risk is exacerbated as the Valley moves into drought conditions again in Spring 2021. We demonstrated an approach which provided the understanding of subsidence in the Valley needed to directly inform sustainable groundwater management, and which is applicable in subsiding regions around the World.

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confidence: 99%

Modeling 65 Years of Land Subsidence in California’s San Joaquin Valley

Lees

Knight²,

Smith

2021

Preprint

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Comprehensive database of land subsidence in 143 major coastal cities around the world: overview of issues, causes, and future challenges

Pedretti,

Giarola,

Korff

et al. 2024

Front. Earth Sci.

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Subsidence refers to the gradual lowering or sudden sinking of the ground surface and is known to impact human lives in terms of damages to the infrastructures, utility lines, and buildings as well as changes in the surficial drainage systems and groundwater conditions. The impacts of land subsidence will be greater in the future, considering the sea level rise, population growth, intensification of coastal erosion and extreme events, as well as increase in flood risk or freshwater salinization, mostly in coastal cities. The main aim of this work is to provide an open-source, peer-reviewed, and comprehensive database identifying the main and secondary causes of land subsidence in 143 coastal cities. We highlight the potential impacts of subsidence that are still unknown in some at-risk cities and non-existence of mitigation measures. The database additionally shows that mitigation measures, specifically those addressing subsidence due to groundwater extraction, have proven successful in the past. The proposed database aims to increase the knowledge on the subsidence phenomenon and also global awareness of land subsidence issues among researchers, the scientific community, stakeholders, and policymakers in terms of urban planning and development.

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A Review of Subsidence Measurements near Mendota, California

Cited by 2 publications

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Modeling 65 Years of Land Subsidence in California’s San Joaquin Valley

Modeling 65 Years of Land Subsidence in California’s San Joaquin Valley

Comprehensive database of land subsidence in 143 major coastal cities around the world: overview of issues, causes, and future challenges

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