Growth rates and scales of sand banks in the Colorado River Delta

Carbajal, Noel; Montaño, Yovani

doi:10.7773/cm.v25i4.728

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…Previous investigations of the Colorado River estuary have used the term “tidal sandbar” to characterize this sediment obstruction, and that usage is employed here. This feature should not be confused with submarine tidal sandbanks found to seaward of this and other macrotidal deltas (Carbajal & Montaño, 1999; Wright, 1977).…”

Section: Introductionmentioning

confidence: 58%

Channel incision by headcut migration: Reconnection of the Colorado River to its estuary and the Gulf of California during the floods of 1979–1988

Nelson

Kendy

Flessa

et al. 2020

Hydrological Processes

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The macrotidal Colorado River Delta at the northern end of the Gulf of California in Mexico is hydrologically complex. We review historical accounts, data, field notes and photographs to evaluate the hydrological processes active on the delta prior to the advent of upstream dams. We also employ satellite imagery as well as recent LIDAR data to illustrate the critical role played by headcut erosion in restoring the river's fluvial/tidewater connection during the 1979-1988 floods. Prior to human manipulation, the river's contribution of fresh water to the Gulf was periodically interrupted by natural overflowing, avulsing, and flooding into the sub-sea level Salton Sink on the north slope of the delta plain. River flow south towards the Gulf was also subject to occasional overflow into Laguna Salada, another sub-sea level basin. In the mid-20th century, the Delta

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Section: Introductionmentioning

confidence: 58%

Channel incision by headcut migration: Reconnection of the Colorado River to its estuary and the Gulf of California during the floods of 1979–1988

Nelson

Kendy

Flessa

et al. 2020

Hydrological Processes

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“…The bed load transport modeling, in flow models in which the transport is parameterized as a function of the depth averaged velocities, has been given by Huthnance (1982); Hulsher (1993); Schuttelaars and De Swart (1996); Van Rijn (1993); Montaño-Ley (2003); Montaño and Carbajal (2008); Carbajal and Montaño (1999) and Carbajal and Montaño (2001). The volumetric sediment flux S b = (S bx , S by ) in the active layer, given by Van Rijn (1993) is:…”

Section: Methodsmentioning

confidence: 99%

Sediment dynamics in a complex coastal lagoon system of the Gulf of California

2015

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Intense transport of sediments occurs along the eastern coast of the Gulf of California, interacting with several coastal lagoons like Santa María-La Reforma. This sediment dynamics plays an important role in the conservation issue of marine species. The effect of tidal currents on the bed load sediment transport has been investigated for this lagoon, emphasizing the mechanisms of the geomorphologic development of the sea bottom. The flow dynamics has been studied applying the vertically integrated shallow water equations through a modified two dimensional non-linear finite difference model. A parameterized formula for the bed load sediment transport and a sediment conservation equation were applied to investigate the morphodynamics of the sea bottom of the lagoon. The predicted currents pattern allowed identifying a zone where tidal waves, entering into the lagoon throughout the northern and southern openings, meet. This process had consequences on the bed load transport of sediment. The results revealed areas where the currents induce noticeable erosion and accretion processes. The complex geometry of the lagoon seems to determine the accretion and erosion areas. Important changes of the order of 0.04 m per year were predicted nearby the Northern inlet and around the Talchichitle Island. The lagoon system exports sediment through the two inlets. This research work contributes to the understanding of the sediment dynamics in an extensive region with a series of coastal lagoons located on the eastern side of the Gulf of California.

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A numerical study on the influence of geometry on the formation of sandbanks

Carbajal

Piney²,

Rivera

2005

Ocean Dynamics

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Applying a two-dimensional, non-linear hydrodynamic numerical model in combination with a semiempirical equation for bedload sediment transport, the influence of geometry on the formation of sandbanks is investigated. In the first experiment, the formation of sandbanks in an ideal rectangular basin, resembling the Taylor's problem, was calculated. Sandbanks occur in a small area at the closed boundary. Similar experiments were carried out for a range of wavelengths of the incident Kelvin wave. The results reveal that large wavelengths favor the generation of sandbanks. In subsequent calculations, the basin was modified by introducing new geographical features like bays and peninsulas. The numerical experiments show that geometry is a fundamental factor to determine the position where groups of sandbanks appear. The results suggest that in regions where the Kelvin wave is diffracted, the formation of sandbanks occurs. An experiment, in which we applied an ideal geometric configuration representing that of the Southern Bight of the North Sea, generated sandbank patterns resembling those observed in the region.

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Growth rates and scales of sand banks in the Colorado River Delta

Cited by 10 publications

References 3 publications

Channel incision by headcut migration: Reconnection of the Colorado River to its estuary and the Gulf of California during the floods of 1979–1988

Channel incision by headcut migration: Reconnection of the Colorado River to its estuary and the Gulf of California during the floods of 1979–1988

Sediment dynamics in a complex coastal lagoon system of the Gulf of California

A numerical study on the influence of geometry on the formation of sandbanks

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