Bedform transport rates for the lowermost Mississippi River

Nittrouer, Jeffrey A.; Allison, Mead A.; Campanella, Richard

doi:10.1029/2007jf000795

Cited by 163 publications

(191 citation statements)

References 42 publications

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“…We then used rating curves (Allison et al, 2017) to compute the discharge of suspended sediments corresponding to each daily water discharge. The lowest flow bin is assumed to carry mud but no sand, consistent with modern observations (Nittrouer et al, 2008). Binning the data by water discharge reduces the confounding influence of hysteresis in the sediment load.…”

Section: Input Sand Fractionmentioning

confidence: 54%

Efficient retention of mud drives land building on the Mississippi Delta plain

Esposito

Shen

Törnqvist³

et al. 2017

Earth Surf. Dynam.

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Abstract. Many of the world's deltas -home to major population centers -are rapidly degrading due to reduced sediment supply, making these systems less resilient to increasing rates of relative sea-level rise. The Mississippi Delta faces some of the highest rates of wetland loss in the world. As a result, multibillion dollar plans for coastal restoration by means of river diversions are currently nearing implementation. River diversions aim to bring sediment back to the presently sediment-starved delta plain. Within this context, sediment retention efficiency (SRE) is a critical parameter because it dictates the effectiveness of river diversions. Several recent studies have focused on land building along the open coast, showing SREs ranging from 5 to 30 %. Here we measure the SRE of a large relict crevasse splay in an inland, vegetated setting that serves as an appropriate model for river diversions. By comparing the mass fraction of sand in the splay deposit to the estimated sand fraction that entered it during its life cycle, we find that this mud-dominated sediment body has an SRE of ≥ 75 %, i.e., dramatically higher than its counterparts on the open coast. Our results show that transport pathways for mud are critical for delta evolution and that SRE is highly variable across a delta. We conclude that sediment diversions located in settings that are currently still vegetated are likely to be the most effective in mitigating land loss and providing long-term sustainability.

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Section: Input Sand Fractionmentioning

confidence: 54%

Efficient retention of mud drives land building on the Mississippi Delta plain

Esposito

Shen

Törnqvist³

et al. 2017

Earth Surf. Dynam.

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“…Although habitat delineations can be done manually, robust automated procedures, like the BRESS method, offer increased speed, efficiency, more objectivity, and reproducible map products. Another possible application is to improve the understanding of seafloor stability, particularly important in the coastal environment [53]. In fact, the quality of the identification of valleys and ridges within a defined range of scales makes BRESS outputs a good candidate for use in the calculation of bedform migration rates.…”

Section: Discussionmentioning

confidence: 99%

A Bathymetry- and Reflectivity-Based Approach for Seafloor Segmentation

2018

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A robust and flexible technique to segment seafloor acoustic mapping data by analyzing co-located bathymetric digital elevation models and acoustic backscatter mosaics is presented. The algorithm first uses principles of topographic openness, pattern recognition, and texture classification to identify geomorphic elements of the seafloor or "area kernels", and then derives the final seafloor segmentation by merging or splitting the kernels based on principles of similarity and multi-modality. The output is a collection of homogeneous, non-overlapping seafloor segments of consistent morphology and acoustic backscatter texture. Each labeled segment is enriched by a list of derived, physically-meaningful attributes that can be used for subsequent task-specific analysis.

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“…In the transport of sediments of the riverbed of great canals and rivers, mainly sandy ones, like the Capibaribe river, there are some difficulties, mostly because of the dynamic conditions of the riverbed-water interface, more complicated in the estuarine regions with a strong tide influence (MILLIMAN; MEADE apud NITTROUER; ALLISON;CAMPANELLA, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Given the shortage and the importance of the studies of sand transport in th riverbeds, Nittrouer, Allison and Campanella (2008) analyzed the transport of sediments of the riverbed, associated to the migration of dunes in localized areas along a section of 15 kilometers of the Mississippi river, utilizing data from the multibeam echobathymeter and river downloads. Luo et al (2007) identified the morphological and hydrological impacts of the Perl River's delta in China, caused by the extraction of sandy sediment of the riverbed, with the intent of using it in construction.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of sedimentary Capibaribe River bed after deepening dredging

Melo

Azevedo

2016

RBRH

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The growth of urban centers in the country are increasingly dependent on the adoption of new mobility options, and before this need was developed and initiated a project to build a river corridor passenger in a part of the Capibaribe River in the city of Recife-PE. For the implementation of a navigation channel deepening are needed dredging to define a geometry of the bed of the river compatible with the needs of ships that will traverse the channel. The monitoring of dredging is done with the constant bathymetric surveys where the information volumes of dredged sediments are removed, aiming to also check the temporal behavior of deposition and erosion processes. In this context, the work aimed to evaluate the geometry of the Capibaribe river bed after the deepening dredging, using data from bathymetric surveys at different times for making longitudinal and transverse profiles, and create digital models of depth to extract information about the deposition/aggradation or erosion/removing sediments and their respective volumes. Early Profile Capibaribe river showed mild slope and heterogeneity in the bottom of the form, especially after kilometer five, with trends of deposition/aggradation downstream of the confluence region with tax arising from the weir Apipucos and upstream of the winding sections in local enlargement of the cross section, and the amount of the fork located at kilometer nine. The scenarios after the dredging to deepen indicate places with predominance of erosion and other sedimentation processes. They compared the longitudinal and transverse profiles of two areas located in western shipping channel, one with 350 meters and over 1000 meters, where it was found that the area 1 to erosion/sediment removal exceeded sedimentation/aggradation, indicating the occurrence of dredging the interval between the two surveys linked to the natural processes. In the study area 2 the sedimentation/aggradation exceeded the removal/erosion, with a volume equivalent to 1 cm thickness. The aggradation occur homogeneously in the navigation channel, while erosion was located on the banks, more intensely on the right bank of the river.

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Bedform transport rates for the lowermost Mississippi River

Cited by 163 publications

References 42 publications

Efficient retention of mud drives land building on the Mississippi Delta plain

Efficient retention of mud drives land building on the Mississippi Delta plain

A Bathymetry- and Reflectivity-Based Approach for Seafloor Segmentation

Dynamics of sedimentary Capibaribe River bed after deepening dredging

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