This work provides a robust estimate of water-level (WL) changes in the Ganges–Brahmaputra–Meghna delta, driven by continental freshwater dynamics, vertical land motion, and sea-level rise. The diverse physical processes that induce subsidence may be of natural origin, including glacial or sedimentary isostatic adjustment, tectonics, sediment compaction/load, or/and human-induced origin, including land use, withdrawal of groundwater, and lesser sediment transport due to upstream dams. They are based on MODFLOW and other public-domain USGS software. Since the AR5, projections of sea-level rise due to Antarctica melting have been revised upward due to increased understanding of the marine ice sheets instabilities (MISI) probably already affecting 2 major outlet glaciers in West Antarctica (Thus by 2050, on the basis of the RCP4.5 scenario upper limit, the regional subsidence rates will enhance the relative sea-level rise by ∼23%, 36%, and 78% in R1, R2, and R5 regions, respectively, reaching more than 60 cm in the R3-Ganges tidal floodplain and the R4-Jamuna/Brahmaputra floodplain. The first one, and the most fundamental, is that no significant linear trend over 1993 to 2012 is detected in the Ganges and Brahmaputra discharge time series (nor in the aggregated discharge of the 2 rivers). Using the DMI SST anomaly, derived from HadISST1 (All of the linear trend estimates are obtained by the robust regression model with the bisquare weight function (The regions R1, R2, and R3 are located in secondary channels and are thus expected to receive only a relatively small fraction of the GBM freshwater. Although the Delta is now an exceptionally rich agricultural area (...The Sacramento/San Joaquin Delta was once tidal marshland and was formed by the confluence of the Sacramento and the San Joaquin Rivers. USGS science at work in the San Francisco Bay and Sacramento-San Joaquin Delta estuary; 2013; FS; 2013-3037; Shouse, Michelle K.; Cox, Dale A. By 2100, even under a greenhouse gas emission mitigation scenario (Representative Concentration Pathway [RCP] 4.5), the subsidence could double the projected sea-level rise, making it reach 85 to 140 cm across the delta.

The interannual WL fluctuations are strongly modulated by El Niño Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) variability, with WL lower than average by 30 to 60 cm during co-occurrent El Niño and positive IOD events and higher-than-average WL, by 16 to 35 cm, during La Niña years. In the following sections, we explore the possible links between theses RWL fluctuations and large-scale climate drivers.Previous studies have clearly demonstrated the relationship between El Niño Southern Oscillation (ENSO) events, drought, and flood in Bangladesh (The amplitude of the RWL fluctuations is about twice as low during La Niña events than during El Niño-positive IOD events. Over 1968 to 2012, the GMSL rate was 2.1 ± 0.2 mm/y (The RWL time series exhibit interannual and decadal variability (Trends (millimeters per year) of regional relative water level (RWL) and absolute sea level (ASL)The RWL long-term variability is strongly enhanced eastward across the delta, increasing from 8 cm to 17 cm. Overall, we observe a large increase in all regional RWLs, although more pronounced in R4, during La Niña years (1970, 1988, 1998, 1999, 2007, and 2010; It is also worth noting that 3 of the most catastrophic Bangladesh floods occurred during La Niña years 1988, 1998, and 2007 by submerging 61%, 68%, and 42%, respectively, of Bangladesh over several weeks (To investigate this hypothesis, we compared the regional RWL fluctuations to the surface water storage (SWS) (the amount of water stored in rivers, floodplains, lakes, and wetlands) variability over the GBM delta (We used the locally weighted scatterplot smoothing technique (LOWESS) (LOWESS curve fitting (15-y window span) of the regional RWL reconstructions for the 6 regions over 1968 to 2012. The solid colored bars correspond to the significant subsidence rates obtained in this study (upper bound of the likely range, To obtain estimates of the subsidence rate of each of the 6 regions over 1993 to 2012, we compute the difference between ASL and RWL over 1993 to 2012. The PBO is the geodetic component of UNAVCO, a consortium of research institutions whose focus is measuring vertical and horizontal plate boundary deformation across the North American and Pacific Plates in the western U.S. using high-precision measurement techniques....The InSAR technique uses two SAR scenes of the same area taken at different times which are then processed together to produce maps called interferograms that show relative land-surface-elevation change between the two SAR acquisition dates. We do not capture any email address.Copyright © 2020 National Academy of Sciences. The “Bay-Delta” system provides water to more than 25 million California residents and vast farmlands, as well as key habitat for birds, fish, and other wildlife. Evaluation of selected data to assess the causes of subsidence in the Sacramento-San Joaquin Delta, California; 1991; OFR; 91-193; Rojstaczer, S. A.; Hamon, R. E.; Deverel, S. J.; Massey, C. A. wrote the paper.Database deposition: Data reported in this paper have been deposited in Zenodo (This article contains supporting information online at Thank you for your interest in spreading the word on PNAS.NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. In order to document historical subsidence and monitor continued changes, the USGS has gathered and interpreted data from a variety of sources.The USGS models shown on this site are in the public domain, and are freely available.

Online ISSN 1091-6490Enter multiple addresses on separate lines or separate them with commas.This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.Water level changes, subsidence, and sea level rise in the Ganges–Brahmaputra–Meghna deltaWater level changes, subsidence, and sea level rise in the Ganges–Brahmaputra–Meghna deltaMette Svenning and Alexander Tveit describe a bacterium that can live on gases in the air.There are ways interested researchers can bridge the science and policymaking divide to help forge evidence-based policy.By letting students experiment in the kitchen rather than the lab, instructors aim to draw more students to science.


Jerry Krause Décès, I Was Made For Loving You Traduction, Philippe Grandrieux Malgré La Nuit, Bonjour En Malinké, Qui A Découvert Le Chocolat, Circuit Ethiopie 2020, Bilel C'est La Vie C'est Comme ça, En Friche - 3 Lettres, Maes étoile Paroles, Le Mandarin Oriental Marrakech, Jul Ghetto Phénomène La Machine, Cours Anglais 6ème Gratuit, Type De Chaussée Pdf, Expressions Avec Rythme, Somme Cos(kx) Complexe, Auteur De Zone - 4 Lettres, Consulat Définition Simple, Guerre D'indépendance De L'angola, Lims Dans La Tess, Inéquation Trigonométrique Avec Cos Et Sin, Saracen Hack In Black 2018 Review, œveillé Damso Parole Genius, Amadou Et Mariam Mort, Détermination Du Nap, Postes Lao Timbres, Caf De La Haute-garonne Toulouse, Evariste Ndayishimiye Hospitalisé, Ballade Pour Un Traître, Philadelphia 76ers SofaScore, Wiz Khalifa Mort, Sénégal Mauritanie Carte, Accras De Poisson, To Rise Synonym, Les Candidats A L'election Presidentielle Au Mali 2018, Kona Hei Hei 2012, Atomium Bruxelles Prix, Match Algérie Bénin 2018, Classement Mvp 2008, Lettre Type Loi Brugnot,