Changes of coastal sedimentation in the Gulf of Tehuantepec, South Pacific Mexico, over the last 100 years from short-lived radionuclide measurements

Ruiz-Fernández, Ana Carolina; Hillaire‐Marcel, Claude; Vernal, Anne de; Machain-Castillo, M. L.; Vásquez, Luís; Ghaleb, Bassam; Aspiazu-Fabian, J. A.; Páez‐Osuna, Federico

doi:10.1016/j.ecss.2009.02.019

“…3, Hu et al 2009;Pasternack et al 2001;Ruiz-Fernandez et al 2009;Syvitski et al 2005;Warrick and Farnsworth 2009;Wolman 1967). In San Francisco Bay, hydraulic mining increased sediment discharge by a factor of 9 from the mid to late 1800s (Fig.…”

Section: Discussionmentioning

confidence: 89%

“…Changes in freshwater inflow cannot explain the variation in bay sediment volume of Finance 2009). Conversion to agriculture and urban land use and overgrazing can increase sediment loads (Pasternack et al 2001;Ruiz-Fernandez et al 2009;Warrick and Farnsworth 2009;Wolman 1967) and thus may have supplied this second pulse of sediment. Sediment load measurements began in water year 1957, probably too late to detect the rising limb of such a pulse.…”

Section: San Francisco Bay Erodible Sediment Poolmentioning

confidence: 99%

Sudden Clearing of Estuarine Waters upon Crossing the Threshold from Transport to Supply Regulation of Sediment Transport as an Erodible Sediment Pool is Depleted: San Francisco Bay, 1999

Schoellhamer

¹

2011

Estuaries and Coasts

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The quantity of suspended sediment in an estuary is regulated either by transport, where energy or time needed to suspend sediment is limiting, or by supply, where the quantity of erodible sediment is limiting. This paper presents a hypothesis that suspended-sediment concentration (SSC) in estuaries can suddenly decrease when the threshold from transport to supply regulation is crossed as an erodible sediment pool is depleted. This study was motivated by a statistically significant 36% step decrease in SSC in San Francisco Bay from water years 1991-1998 to 1999-2007. A quantitative conceptual model of an estuary with an erodible sediment pool and transport or supply regulation of sediment transport is developed. Model results confirm that, if the regulation threshold was crossed in 1999, SSC would decrease rapidly after water year 1999 as observed. Estuaries with a similar history of a depositional sediment pulse followed by erosion may experience sudden clearing.

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“…3, Hu et al 2009;Pasternack et al 2001;Ruiz-Fernandez et al 2009;Syvitski et al 2005;Warrick and Farnsworth 2009;Wolman 1967). In San Francisco Bay, hydraulic mining increased sediment discharge by a factor of 9 from the mid to late 1800s (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Hydraulic mining increased the supply of sediment to San Francisco Bay by a factor of about 9 over several decades (Gilbert 1917). Deforestation and conversion to agricultural and urban land use are a more common anthropogenic mechanism for increasing sediment yield of a watershed (Pasternack et al 2001;Ruiz-Fernandez et al 2009;Wolman 1967). In general, sediment supplied from watersheds in the tropics and Indonesia in particular has increased due to deforestation (Syvitski et al 2005).…”

Section: Erodible Sediment Poolmentioning

confidence: 99%

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Chapter 2Probability Distributions

2016

Introduction to Tsallis Entropy Theory in Water Engineering

0

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The quantity of suspended sediment in an estuary is regulated either by transport, where energy or time needed to suspend sediment is limiting, or by supply, where the quantity of erodible sediment is limiting. This paper presents a hypothesis that suspended-sediment concentration (SSC) in estuaries can suddenly decrease when the threshold from transport to supply regulation is crossed as an erodible sediment pool is depleted. This study was motivated by a statistically significant 36% step decrease in SSC in San Francisco Bay from water years 1991-1998 to 1999-2007. A quantitative conceptual model of an estuary with an erodible sediment pool and transport or supply regulation of sediment transport is developed. Model results confirm that, if the regulation threshold was crossed in 1999, SSC would decrease rapidly after water year 1999 as observed. Estuaries with a similar history of a depositional sediment pulse followed by erosion may experience sudden clearing.

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Analysis and Tendencies of Metals and POPs in a Sediment Core from the Alvarado Lagoon System (ALS), Veracruz, Mexico

Botello

¹

,

Villanueva

²

,

Rivera

³

et al. 2018

Arch Environ Contam Toxicol

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This study focused on dating of a sediment core from the Alvarado Lagoon System, Veracruz, Mexico, calculating the sedimentation rate by using Pb to determine the tendency towards pollution by polycyclic aromatic hydrocarbons, organochlorides, the metals Cd, Cr, Cu, Hg, Ni, Pb, and V, and organic matter content. The activity of total Pb and supported Pb in the samples was 83.1 and 29.5 Bq kg, respectively, whereas the average estimated sedimentation rate was 0.48 ± 0.09 cm per year. The organic matter values exhibited linear behavior throughout the historical profile, with values under 2.5%. Metal concentrations followed the order V > Cr > Ni > Cu > Pb > Hg > Cd. Variations found in Cr, Ni, Pb, and V concentrations are basically due to three meteorological phenomena that hit the region: hurricanes Gladys, Hilda, and Janet in September of 1955. V, Ni, and Hg input comes from anthropogenic and lithogenic sources. The presence of individual polycyclic aromatic hydrocarbons showed no ascending accumulation pattern over time, nor did it show any significant statistical correlation to OM. As for the organochlorine pesticides, 63.61% of the total sum of these compounds were from the ciclodienics family. Concentration of p,p'-DDT was observed only in the earliest profile, from 1929.

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Changes of coastal sedimentation in the Gulf of Tehuantepec, South Pacific Mexico, over the last 100 years from short-lived radionuclide measurements

Cited by 46 publications

References 74 publications

Sudden Clearing of Estuarine Waters upon Crossing the Threshold from Transport to Supply Regulation of Sediment Transport as an Erodible Sediment Pool is Depleted: San Francisco Bay, 1999

Sudden Clearing of Estuarine Waters upon Crossing the Threshold from Transport to Supply Regulation of Sediment Transport as an Erodible Sediment Pool is Depleted: San Francisco Bay, 1999

Chapter 2Probability Distributions

Analysis and Tendencies of Metals and POPs in a Sediment Core from the Alvarado Lagoon System (ALS), Veracruz, Mexico

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