Dam-to-delta sediment inputs and storage in the lower trinity river, Texas

Phillips, Jonathan D.; Slattery, Michael C.; Musselman, Zachary A.

doi:10.1016/j.geomorph.2004.02.004

Cited by 95 publications

(120 citation statements)

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“…Además de la alta variabilidad natural del transporte de sedimentos, un registro de TSS que no presente una tendencia significativa y que, por lo tanto, pueda asumirse como estable, también podría indicar la inexistencia de cambios en el clima o en las características fisiográficas de la cuenca, así como la capacidad de la cuenca de modular dichos cambios como resultado del almacenamiento y una nueva movilización de sedimentos, de manera que los flujos de sedimento permanezcan esencialmente estables, o la interacción de cambios que generen efectos opuestos en el TSS (Walling & Fang, 2003;Phillips, et al, 2004;Wang, et al, 2010). Teniendo en cuenta que por sus características fisiográficas, en la mayoría de estas cuencas se esperan altos valores de SDR, lo cual implica una menor capacidad de modulación, y que los resultados del análisis de tendencias y periodicidades del caudal hechos por Restrepo, et al…”

Section: Transporte De Sedimento En Suspensión: Magnitud Y Tendenciasunclassified

“…En otras cuencas se produce el efecto contrario. En algunos casos, estos procesos pueden crear un desacoplamiento entre los cambios que se experimentan en la parte alta o media de una cuenca y los que se reflejan en su parte inferior (Phillips, et al, 2004). Por todo lo anterior, consideramos que los mecanismos forzadores climáticos y oceanográficos asociados a las oscilaciones detectadas mediante el análisis espectral definen un marco de variabilidad de mediano a largo plazo del TSS, mientras que las características fisiográficas, litológicas y ambientales de la cuenca definen la capacidad de magnificar, atenuar o desplazar temporalmente estas señales.…”

Section: Variabilidad Del Transporte De Sedimento En Suspensiónunclassified

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Transporte de sedimentos en suspensión en los principales ríos del Caribe colombiano: magnitud, tendencias y variabilidad

Restrepo

Royero

Díaz

et al. 2015

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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ResumenSe analizaron series mensuales del transporte de sedimento en suspensión de siete ríos del Caribe colombiano, con el fin de proporcionar un estimativo actualizado, detectar los cambios recientes y los patrones de variabilidad del transporte de sedimento en suspensión. En su conjunto, estos ríos transportan un promedio de ~146,3 x10 6 t a -1 de sedimentos en suspensión hacia el litoral Caribe colombiano. El mayor aporte proviene del río Magdalena, con 142,6 x10 6 t a -1 , que corresponden a 38 % del total de los sedimentos en suspensión estimados para el litoral Caribe. La tasa anual del transporte de sedimentos en suspensión de estos sistemas fluviales ascendió hasta 36 % entre 2000 y 2010. El análisis espectral basado en la transformada de ondícula (wavelet) evidenció lapsos de intensa variabilidad entre los periodos 1987-1990 y 1994-2002, en los cuales las principales componentes oscilatorias aparecieron de manera simultánea. Las bandas anual, semianual y 'cuasi-decadal' aparecieron como las principales componentes oscilatorias en la variabilidad del transporte de sedimento en suspensión, mientras que las bandas 'cuasibienal' e interanual constituyeron una fuente de variabilidad de segundo orden. Se considera que los mecanismos forzadores climáticos y oceanográficos asociados con las oscilaciones detectadas mediante el análisis espectral definen un marco de variabilidad de mediano a largo plazo para el transporte de sedimentos en suspensión.Palabras clave: transporte de sedimentos en suspensión, mar Caribe, variabilidad hidrológica, análisis espectral basado en la transformada de ondícula. Suspended sediment load in Colombian Caribbean Rivers: Magnitude, trends and variability AbstractThe data on the monthly average of suspended sediment load from seven rivers in northern Colombia (Caribbean alluvial plain) draining into the Caribbean Sea were analysed to quantify the magnitudes, to estimate long-term trends, and to evaluate the variability patterns. These rivers deliver an average of ~146.3 x10 6 t yr -1 of suspended sediments to the Colombian Caribbean littoral. The largest sediment supply is provided by the Magdalena River, with a mean suspended sediment load of 142.6 x10 6 t yr -1 , which is 38% of the total fluvial discharge estimated for the Caribbean littoral. Between 2000 and 2010, the annual suspended sediment load of these rivers increased to 36%. The wavelet spectral analyses highlighted periods of intense variability between the periods of 1987-1990 and 1994-2002, where the major oscillation processes appeared simultaneously. The semi-annual, annual and quasi-decadal bands were the main factors controlling the suspended sediment load variability of these fluvial systems, whereas the quasi-biennial and interannual bands constituted second order sources of variability. The climatic/oceanographic drivers associated to the oscillations identified through the wavelet spectral analyses defined a medium/long term framework of variability for the suspended sediment load.

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Section: Transporte De Sedimento En Suspensión: Magnitud Y Tendenciasunclassified

Section: Variabilidad Del Transporte De Sedimento En Suspensiónunclassified

Transporte de sedimentos en suspensión en los principales ríos del Caribe colombiano: magnitud, tendencias y variabilidad

Restrepo

Royero

Díaz

et al. 2015

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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“…In some cases, dams may reduce sediment transport for a considerable distance downstream, whereas in other cases impacts are apparent only in the reach immediately downstream of the dam (Brandt 2000). For instance, for the lower Trinity River (California, USA), Phillips et al (2004) showed that the lake and the Livingston Dam had no significant effect on sediment delivery to Trinity Bay. In contrast, major dams and reservoir constructions on the Missouri and Arkansas rivers, and revetments on the Mississippi River mainstem channel, have reduced suspended sediment loads reaching the Gulf of Mexico by between 50% and 70% (Meade and Parker 1985), resulting in loss of wetlands and delta areas (Day et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Reach-scale suspended sediment balance downstream from dams in a large Mediterranean river

Tena

Batalla

Vericat

2012

Hydrological Sciences Journal

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This paper presents a reach-scale sediment balance of a large impounded Mediterranean river (the lower Ebro, 1998Ebro, -2008. Multi-temporal sediment storage and the influence of floods and tributaries on the sediment load were examined using continuous discharge and turbidity records. The mean annual suspended sediment load at the reach outlet (Xerta) is 0.12 × 10 6 t, corroborating previous results. Suspended sediment concentrations were low (SSC mean = 13 mg L -1 ), attaining a maximum of 274 mg L -1 . Erosion processes (channel-scour, bank erosion) are dominant, and net export of sediment occurs over the long term. Unexpectedly, ephemeral tributaries were found to contribute significantly: sediment delivered during torrential events attained 5% of the Ebro annual load, and was even larger than that in flushing flows. Overall, most of the suspended sediment load is transported by floods (up to 65% in some years). The results constitute basic information to underpin current management actions aiming to achieve the sustainability of the riverine and deltaic system. Key words sediment transport; dams; flow regulation; floods; sediment storage; erosion; sedimentation; River Ebro Bilan des sédiments en suspension dans un bief de grand fleuve méditerranéen en aval de barrages Résumé Cet article présente un bilan des sédiments en suspension à l'échelle d'un bief d'un grand fleuve méditer-ranéen harnaché (à l'aval de l 'Ebre, 1998'Ebre, -2008. Le stockage des sédiments à toutes les échelles de temps et le rôle des inondations et des affluents sur la charge sédimentaire ont été examinés en utilisant des enregistrements continus du débit et de la turbidité. La moyenne annuelle de la charge de sédiments en suspension à l'exutoire (Xerta) est de 0,12 × 10 6 t, ce qui corrobore des résultats précédents. Les concentrations de sédiments en suspension étaient faibles (CSSmoyen = 13 mg L -1 ), atteignant un maximum de 274 mg L -1 . Les processus d'érosion (affouillement du chenal, érosion des berges) sont dominants et, sur le long terme, on observe une exportation nette de sédiments. De façon inattendue, on constate que les affluents intermittents contribuent de manière significative: les sédiments exportés lors d'événements torrentiels représentent 5% de la charge annuelle de l'Ebre, et sont même plus importants que ceux des débits de chasse. Dans l'ensemble, l'essentiel de la charge de sédiments en suspension est transporté au cours des crues (jusqu'à 65% sur quelques années). Les résultats constituent une information de base permettant d'étayer la politique de gestion actuelle visant à assurer la viabilité du système fluvial et deltaïque.

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“…As a flow-through water supply reservoir with no flood control function, Livingston Dam has had no discernible effect on flow regimes in the lower Trinity, while greatly reducing sediment loads due to trapping of sediment in the lake (Phillips et al, 2004). 'Hungry water' scour downstream of dams is common, and these effects are often relatively localized.…”

Section: Introductionmentioning

confidence: 99%

Channel adjustments of the lower Trinity River, Texas, downstream of Livingston Dam

Phillips

Slattery

Musselman

2005

Earth Surf Processes Landf

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133

106

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Channel cross-sectional changes since construction of Livingston Dam and Lake Livingston in 1968 were studied in the lower Trinity River, Texas, to test theoretical models of channel adjustment, and to determine controls on the spatial extent of channel response. High and average flows were not significantly modified by the dam, but sediment transport is greatly reduced. The study is treated as an opportunistic experiment to examine the effects of a reduction in sediment supply when discharge regime is unchanged. Channel scour is evident for about 60 km downstream, and the general phenomena of incision, widening, coarsening of channel sediment and a decrease in channel slope are successfully predicted, in a qualitative sense, by standard models of channel response. However, there is no consistent channel response within this reach, as various qualitatively different combinations of increases, decreases or no change in width, depth, slope and roughness occur. These multiple modes of adjustment are predicted by the unstable hydraulic geometry model. Between about 60 km and the Trinity delta 175 km downstream of the dam, no morphological response to the dam is observed. Rather than a diminution of the dam's effects on fluvial processes, this is due to a fundamental change in controls of the fluvial system. The downstream end of the scour zone corresponds to the upstream extent of channel response to Holocene sea level rise. Beyond 60 km downstream, the Trinity River is characterized by extensive sediment storage and reduced conveyance capacity, so that even after dam construction sediment supply still exceeds transport capacity. The channel bed of much of this reach is near or below sea level, so that sea level rise and backwater effects from the estuary are more important controls on the fluvial system than upstream inputs.

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Dam-to-delta sediment inputs and storage in the lower trinity river, Texas

Cited by 95 publications

References 31 publications

Transporte de sedimentos en suspensión en los principales ríos del Caribe colombiano: magnitud, tendencias y variabilidad

Transporte de sedimentos en suspensión en los principales ríos del Caribe colombiano: magnitud, tendencias y variabilidad

Reach-scale suspended sediment balance downstream from dams in a large Mediterranean river

Channel adjustments of the lower Trinity River, Texas, downstream of Livingston Dam

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