The quintessential s-shape in sedimentology: A review on the formation and controls of clinoform shape DOI Creative Commons
Ingrid Anell

Earth-Science Reviews, Journal Year: 2024, Volume and Issue: 254, P. 104821 - 104821

Published: May 25, 2024

Clinoforms are ubiquitous depositional surfaces in sedimentary systems. The quintessential shape, with a flat or gentle topset, sloping foreset, and to bottomset, is recognizable the smallest ripple kilometer high edges of continents. Essentially shape one which develops differential sedimentation away from source. Systematic decay transport competence and/or sediment amount site favouring deposition, generates loading typically lens-shaped body. lithology, grain size, water depth, hydrodynamic factors, mechanisms, antecedent topography, relative sea level rate all interact create different sizes, slopes shapes. Meanwhile there several fundamental similarities between clinoforms, even bedwave features (ripples dunes), despite forming under very conditions. All clinoforms some extent governed by accommodation energy limiting factors (water agitation flow regime), controls their height, proxy influences slope angle. Lithology exerts control, can build angle repose, higher for coarser non-cohesive sediment, while cohesive gentler slopes, also fail at lower angles. Sediment repose steep linear segments, but conversely on continental margins extremely low angle, probably reflecting little along-slope contrast mud-dominance. clinothems similar lithology display wide range foreset angles, indicating numerous additional controls. Sedimentation appears exert significant control steepness, limited promoting steeper related basinward thinning deposits. observation greater depth response deepening environments generating effect comparatively less sedimentation. Processes important controlling as tidal wave reworking, debris flows, overpressure failure, Turbidity currents meanwhile part dynamic system both steepen slope. There four basic clinoform shapes: concave, linear, convex, sigmoidal. These develop variations along profile driven erosion/bypass/factors deposition/accumulation/waning supply. Curvature tends be an indication contrast, such erosional sandier muddier Sigmoidal clinothems, associated more trajectories, shorter than concave clinothems. Decaying shear-zone reworking erosion shapes rounded rollover. carrying capacity ensuing curvature. Concave lacking topsets sharp rollovers often longer sigmoidal forms. Their formation likely closely linked increased accumulation through bypass, turbidity currents, suspension-dominated deposition smaller clinoforms. In this ripples differ, transition rounding crest, unlike larger

Language: Английский

Coastal Morphodynamics and Climate Change: A Review of Recent Advances DOI Creative Commons

Lynn Donelson Wright,

B. G. Thom

Journal of Marine Science and Engineering, Journal Year: 2023, Volume and Issue: 11(10), P. 1997 - 1997

Published: Oct. 17, 2023

The shape of the coast and processes that mold it change together as a complex system. There is constant feedback among multiple components system, when climate changes, all facets system change. Abrupt shifts to different states can also take place certain tipping points are crossed. coupling rapid warming in Arctic with melting sea ice one example positive feedback. Climate particularly rising temperatures, causing an increasing frequency tropical storms “compound events” such storm surges combined torrential rains. These events superimposed on progressive rises relative level anticipated push many coastal morphodynamic systems beyond which return preexisting conditions unlikely. Complex modeling results long-term sets observations from diverse cases help anticipate future threats. Innovative engineering solutions needed adapt changes landscapes environmental risks. New understandings cascading climate-change-related physical, ecological, socioeconomic effects, multi-faceted continually contributing imperative search for resilience. Recent contributions, summarized here, based theory, observations, numerically modeled results, regional case studies, global projections.

Language: Английский

Citations

12
Concerns about data linking delta land gain to human action DOI
Florin Zăinescu, Edward J. Anthony, Alfred Vespremeanu‐Stroe

et al.

Nature, Journal Year: 2023, Volume and Issue: 614(7947), P. E20 - E25

Published: Feb. 8, 2023

Language: Английский

Citations

11
Evaluating flood hazards in data-sparse coastal lowlands: highlighting the Ayeyarwady Delta (Myanmar) DOI Creative Commons
Katharina Seeger, Andreas Peffeköver, Philip S. J. Minderhoud

et al.

Environmental Research Letters, Journal Year: 2024, Volume and Issue: 19(8), P. 084007 - 084007

Published: July 11, 2024

Abstract Coastal lowlands and river deltas worldwide are increasingly exposed to coastal, pluvial fluvial flooding as well relative sea-level rise (RSLR). However, information about both single multiple flood-type hazards, their potential impact the characteristics of areas, population assets at risk is often still limited high-quality data either does not exist or accessible. This constitutes a main barrier for generating sound assessments, especially scientific public communities in so-called Global South. We provide standardised, integrative approach first-order assessment these hazards show how this can be conducted data-sparse, hardly accessible inaccessible coastal such Ayeyarwady Delta Myanmar by using only open freely available datasets satellite imagery, global precipitation estimates, satellite-based discharge measurements, elevation, land use, data. More than 70% delta, mainly used agriculture, 40% its present prone due monsoon runoff, storm surge, RSLR, combination, jeopardising food security economic development region. The allows integration combination various datasets, combined highly flexible workflow that performs low computational capacities, supporting evaluation flood-prone areas on regional local scale data-sparse worldwide. It thereby attribute different types flood complements concepts vulnerability risk, supports risk-informed decision making effective multi-flooding adaptation strategies.

Language: Английский

Citations

4
Delta lobe development in response to changing fluvial sediment supply by the second largest river in Vietnam DOI
Nguyen Hao Quang, Nam Thang Ha,

Nguyen Van An

et al.

CATENA, Journal Year: 2023, Volume and Issue: 231, P. 107314 - 107314

Published: June 26, 2023

Language: Английский

Citations

10
‘DeltaCAN - A new data set of Canadian Arctic and subarctic coastal deltas’ DOI Creative Commons
Mette Bendixen,

Beatrice Roberge,

Jenny Park

et al.

Scientific Data, Journal Year: 2025, Volume and Issue: 12(1)

Published: Jan. 21, 2025

Arctic coasts constitute the critical interface between land and sea, are subject to rapid changes caused by a warming climate. Current trends throughout show increasing erosion trends, while other parts of coast experiencing prograding trends. Until now, vast majority our knowledge coastal evolution is confined site-specific studies with limited geospatial representation. Here, we present DeltaCAN, novel data set on locations Canadian deltas larger than 500 m in width derived visual interpretation freely available satellite imagery. DeltaCAN Canada's first nationwide detection covering 250.000 km coastline Arctic, identifying 2712 deltas. The inventory based inspection remotely-sensed imageries, developed through an expert-based mapping approach where implemented quality control mechanism assess completeness set. allows for assessing at unprecedented spatial extent, improving understanding delta morphodynamics.

Language: Английский

Citations

0
Evolution and Reclamation of the Bhasan Char Island, Meghna Estuary, Bangladesh DOI
Abhijit Das, Sunando Bandyopadhyay

Journal of the Indian Society of Remote Sensing, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Language: Английский

Citations

0
The Great Mississippi River Flood of 1927: Morphodynamic Analysis of The Caernarvon Crevasse Event DOI Creative Commons
Ahmed M. Khalifa, Ehab Meselhe, Kelin Hu

et al.

Estuarine Coastal and Shelf Science, Journal Year: 2025, Volume and Issue: unknown, P. 109234 - 109234

Published: March 1, 2025

Language: Английский

Citations

0
Long-term streamflow discharge from the Niger River Basin into the delta region DOI Creative Commons

Matthew Afolabi

Hydrological Sciences Journal, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Language: Английский

Citations

0
Distributary development in a 21st century river: The evolution of Neptune Pass and its delta, the largest new offshoot of the Mississippi River DOI Creative Commons
Alexander S. Kolker,

H. Dallon Weathers,

Christy Swann

et al.

PLoS ONE, Journal Year: 2025, Volume and Issue: 20(4), P. e0320502 - e0320502

Published: April 16, 2025

The development of distributaries in large river deltas plays an important role the geology, hydrology, and ecology coastal ocean, as rivers are a dominant mechanism by which particulate, suspended, dissolved material is delivered from continents to global ocean. And yet, there relatively little, near-real time observational data on -- part because modern observation coincides with era when have been controlled engineering projects (i.e., 20th 21 st centuries). This article reports Neptune Pass, largest new distributary form Mississippi River nearly century. It developed between 2019 2021 small canal rapidly expanded at least order magnitude. system now carries about 15–17% flow River, > 3,000 m 3 s -1 moderately high flows. comparable 10th North America 100th Earth. Pass building delta, this study sought examine whether delta comprised largely eroded (redistributed sediment hypothesis), or includes recently derived (new hypothesis). These hypotheses were tested using combination marine-geophysical surveys, remote sensing techniques, core collections. Results indicate that Quarantine Bay was 56–79% larger than excavated corroborating hypothesis, indicating it net land system. findings provide key insights critical restoration safe management its kind America.

Language: Английский

Citations

0
A conceptual framework for integrating deltaic food systems and spatial design: the case of the Mekong River Delta DOI Creative Commons

Sophia Arbara,

Fransje Hooimeijer

Frontiers in Sustainable Food Systems, Journal Year: 2025, Volume and Issue: 9

Published: April 17, 2025

Food and deltaic systems are complex, interlinked that crucial for future sustainable development. This study explores the synergy between these two to establish an agroecological framework delta urbanism. Drawing on political ecology approaches infrastructural turn, this critically revisits food understand how they can be better integrated with hydrological, infrastructural, urban–rural processes. It also addresses fundamental questions necessary creating new pathways redesigning areas. Second, it examines both past models of equations in relation landscape. Finally, proposes a spatial based layered approach aims provide analytical research design related deltas across various scales historical timeframes. The operational basis presenting methodology is case Mekong River Delta its rice cultivation territories. Findings emphasize significance technological milestones their implications shaping resource availability, population growth, climate change. Further application operationalization will deeper understanding complex interactions among production, environmental change, socioeconomic structures, providing valuable insights into agricultural practices adaptation.

Language: Английский

Citations

0