Flood deposition and storm removal of sediments in front of a deltaic wave-influenced river mouth

Zăinescu, Florin; Vespremeanu‐Stroe, Alfred; Anthony, Edward J.; Tătui, Florin; Preoteasa, Luminiţa; Mateescu, Răzvan

doi:10.1016/j.margeo.2019.106015

Cited by 27 publications

(23 citation statements)

References 85 publications

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“…The primary data to explore sediment transport patterns, rates and processes at the two river mouths were from topo-bathy surveys. Topo-bathy surveys allow for detailed analyses of the locations, patterns and rates of landform change, which can be used to assess sediment transport patterns and rates (Zȃinescu et al, 2019). For each river mouth, topographic measurements were taken at low tide with survey-grade global navigation satellite system (GNSS) receivers, and bathymetric measurements were collected with similar GNSS receivers combined with singlebeam echo sounders operated from small-motorized watercraft.…”

Section: River Mouth Surveysmentioning

confidence: 99%

“…Although many investigations have explored the morphodynamics of these small river mouths, studies generally focus on the sub-aerial beach of the river mouth and the dynamics of river barrier breaching, which, although important to resource management and ecosystem services, do not include an overall sediment mass balance (Hume and Herdendorf, 1988;Kirk, 1991;Bird, 1994;Cooper, 2001;Bittencourt et al, 2007;Hart, 2009;Lichter et al, 2011;Behrens et al, 2013;Measures et al, 2020). A key method to capture the sediment mass balance is the collection of frequent, high-accuracy coastal topography and bathymetry, which can be challenging and expensive to obtain but are essential to understanding the morphodynamic patterns and sediment budgets (Zȃinescu et al, 2019).…”

Section: Application To River Mouths Globallymentioning

confidence: 99%

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Littoral Sediment From Rivers: Patterns, Rates and Processes of River Mouth Morphodynamics

Warrick

2020

Front. Earth Sci.

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Rivers provide important sediment inputs to many littoral cells, thereby replenishing sand and gravel of beaches around the world. However, there is limited information about the patterns and processes of littoral-grade sediment transfer from rivers into coastal systems. Here I address these information gaps by examining topographic and bathymetric data of river mouths and constructing sediment budgets to characterize time-dependent patterns of onshore, offshore, and alongshore transport. Two river deltas, which differ in their morphology, were used in this study: the Elwha River, Washington, which builds a mixed sediment Gilbert-style delta, and the Santa Clara River, California, which builds a cross-shore dispersed sand delta from hyperpycnal flows. During and after sediment discharge events, both systems exhibited a similar evolution composed of three phases: (i) submarine delta growth during offshore transport of river sediment, (ii) onshore-dominated transport from the submarine delta to a subaerial river mouth berm, and (iii) longshore-dominated transport away from the river mouth following subaerial berm development. Although stage (ii) occurred within days to weeks for the systems studied and was associated with the greatest rates of net erosion and deposition, onshore transport of sediment from submarine deposit to the beach persisted for years following the river discharge event. These morphodynamics were similar to simple equilibrium profile concepts that were modified with an onshore-dominated cross-shore transport rule. Additionally, both study sites revealed that littoral-grade sediment was initially exported to depths beyond the active littoral cell (i.e., below the depth of closure) during the stage (i). Following several years of reworking by coastal processes, bathymetric surveys suggested that 14 and 46% of the original volume of littoral-grade sediment discharged by the Santa Clara and Elwha Rivers, respectively, continued to be below the depth of closure. Combined, this suggests that integration of river sediment into a littoral cell can be a multi-year process and that the full volume of littoral-grade sediment discharged by small rivers may not be integrated into littoral cells because of sand and gravel "losses" to the continental shelf.

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Section: River Mouth Surveysmentioning

confidence: 99%

Section: Application To River Mouths Globallymentioning

confidence: 99%

Littoral Sediment From Rivers: Patterns, Rates and Processes of River Mouth Morphodynamics

Warrick

2020

Front. Earth Sci.

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“…Further south, the St. George lobe is undergoing erosion near the river mouth [28], but the littoral cell is characterized by sediment budget equilibrium due to the high growth in land area at the distal tip of the Sacalin spit. The Sacalin spit achieved one phase of rollover migration during this period [29], and registered one of the fastest rates of shoreline change recorded in any delta, as shown in Figure 7c. Part of this rapid change, associated with L→W conversion (land loss), is not captured by the GSW data, but was added in the calculation of the net coastal zone change (Table 2).…”

Section: Discussionmentioning

confidence: 88%

Multi-Decadal Deltaic Land-Surface Changes: Gauging the Vulnerability of a Selection of Mediterranean and Black Sea River Deltas

Anthony

Besset²,

Zăinescu

et al. 2021

JMSE

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Areal changes over delta surfaces determined by land and water ratios are a promising tool for identifying spatial and temporal changes in deltas that may reveal subsidence and shoreline erosion. Such changes can also provide the basis for more detailed studies on variations in land-cover and vegetation. Changes in land and water areas over a 35-year period (1984–2019) were determined for a selection of ten river deltas in the Mediterranean (Nile, Rhône, Po, Ebro, Moulouya, Ceyhan-Seyhan, Medjerdja, Ombrone, Arno) and the Black Sea (Danube), with a particular focus on aspects of subsidence and shoreline erosion. With the exception of the Ombrone, Arno, and Moulouya, and to lesser extent the Medjerdja, where notable changes dominate in the coastal zone and are tantamount to net erosion, the spatial pattern is largely dominated by delta-plain changes characterized by increasing areas of water. The pattern reflects a mix of shoreline erosion, land-use and land-cover changes, such as the ecological restoration of wetlands, but also increasing subsidence in these deltas, all of which have been exposed to a declining fluvial sediment supply due to human influence. The use of data on land-water ratios needs to be complemented by more detailed studies devoted to each delta in order to clearly disentangle changes related to land-use, vegetation, and subsidence. It is also important to determine how wetlands are interpreted in such ratios, as these important ecological elements are sensitive to ratio variations. It would also be interesting in future studies to examine how these variations play out over time, notably in deltas where changes have been significant over the period 1984–2019.

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“…MIKE 11 is a simulation system with a clear structure, a friendly interface, and a wide range of applications. It can be widely used in many research areas, such as simulating water flows in estuaries and river networks, regional analysis of drainage systems, and optimization of ground drainage schemes [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sponge City Construction for Reducing Directly Connected Impervious Areas on Hydrological Responses at the Urban Catchment Scale

Liang

Zhang

Xia

et al. 2020

Water

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Low-impact development (LID) has been widely used at both site-specific and local scales to try and mitigate the impact of urban stormwater runoff caused by increasing impervious urban areas. Recently, the concept of a “sponge city” was proposed by the Chinese government, which includes LID controls at the source, a pipe drainage system midway, and a drainage system for excess stormwater at the terminal. There is a need to evaluate the effectiveness of sponge city construction at the large urban catchment scale, particularly with different spatial distributions of LIDs that reduce directly connected impervious areas (DCIAs). In this paper, the performances of five design scenarios with different spatial distributions but same sizes of LID controls at the urban catchment scale were analyzed using a geographic information system (GIS) of the United States Environmental Systems Research Institute (ESRI)—based Storm Water Management Model (SWMM) of the United States Environmental Protection Agency (USEPA) and MIKE 11 of Danish Hydraulic Institute (DHI) in Xining City, China. Results confirmed the effectiveness of sponge city construction in reducing the urban stormwater runoff. The hydrological performance reduction was positively correlated and linearly dependent on DCIA reduction. Peak flow reduction was most sensitive to DCIA reduction, followed by runoff volume and peak time. As rainfall intensity increased, the hydrological performance was more sensitive to rainfall intensity than DCIA reduction. Results of this study provide new insights for stormwater managers to implement LID more effectively at the urban catchment scale.

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Flood deposition and storm removal of sediments in front of a deltaic wave-influenced river mouth

Cited by 27 publications

References 85 publications

Littoral Sediment From Rivers: Patterns, Rates and Processes of River Mouth Morphodynamics

Littoral Sediment From Rivers: Patterns, Rates and Processes of River Mouth Morphodynamics

Multi-Decadal Deltaic Land-Surface Changes: Gauging the Vulnerability of a Selection of Mediterranean and Black Sea River Deltas

The Effect of Sponge City Construction for Reducing Directly Connected Impervious Areas on Hydrological Responses at the Urban Catchment Scale

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