High Spatial Resolution in Total Water Storage Variations Inferred From GPS: Case Study in the Great Lakes Watershed, US

Water Resources Research, Год журнала: 2024, Номер 60(7)

Опубликована: Июнь 27, 2024

Abstract Assessing spatiotemporal water storage variability in the Great Lakes Watershed (GLW) is critical given its transboundary status impacting both Canada and United States. Here, we apply a novel inversion strategy to global positioning system (GPS) vertical movements achieve high spatial resolution total (TWS) variations GLW through improved processing. The steps are composed of removing load changes driven by lake fluctuation forward modeling, isolating grids solve ill‐conditioned problem inversion, inverting GPS residual series estimate TWS on land (TWS ). results show that regional dense continuous observation network can successfully resolve at monthly timescales with 30–45 km resolution. We also could effectively capture fine‐scale features than GRACE/GFO mascon products. satellites largely underestimate seasonal long‐term fluctuations, but their temporal patterns coincide those from GPS. average annual amplitude reaches 82.0 mm, greatly exceeding estimates (∼48.0 mm) composite hydrological model outputs (∼62.0 mm). groundwater fluctuations inferred have peak‐to‐peak amplitudes ∼40 3 maximum around September. This coincides GRACE/GFO. However, magnitudes phases vary markedly among subbasins GLW, different snow soil moisture amounts measured each subbasin cause discrepancies these estimates. study shows value data spatially downscaling providing high‐resolution output scales low latency.

Язык: Английский

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Drought Characterization With GPS: Insights Into Groundwater and Surface‐Reservoir Storage in California

Water Resources Research, Год журнала: 2024, Номер 60(8)

Опубликована: Авг. 1, 2024

Abstract Drought intensity is commonly characterized using meteorologically‐based metrics that do not provide insight into water deficits within deeper hydrologic systems. In contrast, global positioning system (GPS) displacements are sensitive to both local and regional hydrologic‐storage fluctuations. While a few studies have leveraged this sensitivity produce geodetic drought indices, characterization GPS accounted for in assessment management. To motivate application, we new index (GDI) quantify its ability characterize conditions key surface sub‐surface reservoirs/pools across California. northern California, the GDI exhibits strong association with surface‐reservoir storage at 1‐month time scale (correlation coefficient: 0.83) groundwater levels 3‐month 0.87), along moderate associations stream discharge daily (instantaneous) 0.50). Groundwater southern California best 12‐month 0.77), optimized 0.72). Two sigma uncertainties ±0.03. Differences between reveal unique aquifer drainage basin characteristics. addition capturing long‐term trends, rapid changes initiate during clusters of large atmospheric river events closely mirror fluctuations traditional meteorological observations. We show GPS‐based indices significant opportunity improve assessment, beyond, by improving our understanding cycle.

Язык: Английский

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Introducing the Idea of Classifying Sets of Permanent GNSS Stations as Benchmarks for Hydrogeodesy

Journal of Geophysical Research Solid Earth, Год журнала: 2023, Номер 128(9)

Опубликована: Сен. 1, 2023

Abstract We propose a novel approach to classify sets of Global Navigation Satellite System (GNSS) permanent stations as benchmarks for hydrogeodesy. Benchmarks are trusted GNSS whose displacements classified significantly and positively correlated with hydrospheric changes identified in three temporal‐scales: short‐term, seasonal long‐term. use 63 vertical displacement time series processed at the Nevada Geodetic Laboratory period 1998–2021 from located within Amazon basin show that estimates trends annual signals, including phase maximum, very coherent water surface levels provided by altimetry missions. compute Gravity Recovery Climate Experiment (GRACE) GRACE Follow‐On gravity missions predict those also Land Water Storage (GLWS) v2.0 data set which values produced assimilation into WaterGAP Hydrological Model (WGHM). divide pre‐defined temporal‐scales long‐term, using non‐parametric wavelet analysis. For each temporal‐scale, correlation coefficients computed between GNSS‐measured GRACE‐derived/GLWS‐predicted displacements. present benefits applying high‐resolution GRACE‐assimilating hydrology model benchmark stations, particularly evident when spherical harmonic higher than 120. Their increase causes number included rise up 15% short‐term. Benchmarking allows hydrogeodesy take advantage broader were previously omitted, such earthquake‐affected sites where possible poroelastic response is observed.

Язык: Английский

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High-Resolution Deformation Monitoring from DInSAR: Implications for Geohazards and Ground Stability in the Metropolitan Area of Santiago, Chile

Remote Sensing, Год журнала: 2022, Номер 14(23), С. 6115 - 6115

Опубликована: Дек. 2, 2022

Large urban areas are vulnerable to various geological hazards and anthropogenic activities that affect ground stability—a key factor in structural performance, such as buildings infrastructure, an inherently expanding context. Time series data from synthetic aperture radar (SAR) satellites make it possible identify small rates of motion over large the Earth’s surface with high spatial resolution, which is detecting high-deformation areas. Santiago de Chile’s metropolitan region comprises a Andean foothills basin one most seismically active subduction zones worldwide. The its surroundings prone megathrust shallow crustal earthquakes, landslides, constant effects, overexploitation groundwater land use modification, all constantly stability. Here, we recorded deformations using multi-temporal differential interferometric (DInSAR) Sentinel 1, obtaining high-resolution between 2018 2021. GNSS stations show regional uplift area (~10 mm/year); meanwhile, DInSAR allows for identification anomalous local subsistence (rates < −15 mm/year) mountain sectors landslides unprecedented detail. Ground deformation patterns vary depending on factors soil type, geometry, soil/soil heterogeneities. Thus, subsidence concentrated fine sedimentary cover depressing water table well cropping excess withdrawal. There no evidence detectable movement San Ramon Fault (the major quaternary fault area) observational period. Our results highlight mechanical control sediment characteristics impact processes These essential assess stability contribute future infrastructure development hazard management highly populated

Язык: Английский

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Hydrological deformation of karst aquifers detected by GPS measurements, Matese massif, Italy

Environmental Earth Sciences, Год журнала: 2023, Номер 82(9)

Опубликована: Май 1, 2023

Язык: Английский

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