-James Bond River cross section. For legend see Figure 2.
A lowering of the crevasse-splay body can be explained by sudden compaction of the underlying peat. Of course, the compaction ratio for peat is much higher than for other floodplain clastic ...
Oblique aggradation: a novel explanation for sinuosity of …
Owing to this oblique aggradation in combination with floodplain widening, the stream becomes stretched out as channel reaches may alternately aggrade along opposed valley sides, resulting in increased sinuosity over time. ... This paper illustrates the response of a fluvial depositional system to the interplay between peat compaction and ...
Factors controlling peat compaction in alluvial floodplains: …
Sheet-like splay deposits initially compact underlying peat uniformly, whereas differential compaction commonly occurs beneath natural levees due to lateral variations in sediment thickness. Subsidence due to peat compaction creates additional accommodation space and hence locally enhances floodplain sedimentation rates.
Compaction rates and paleo-sea levels along the delta …
mangrove peat; beach sand; fluvial sand and mud; and uppermost floodplain clays. Porosities of the ... organic-rich soils such as peat. Enhanced compaction
Effects of peat compaction on delta evolution: A review on …
In this review, the authors discussed on the peatland function in global perspective, the important of peat soil compaction, emergence of potential peat compaction in oil palm plantation ...
Conceptual models for short‐eccentricity‐scale climate control on peat
In model 1, orbitally forced climate change controls the timing of peat compaction, leading to enhancement of autogenic channel avulsions. In model 2, orbitally forced climate change controls upstream sediment supply and clastic influx determining the persistence of peat-forming conditions.
2 Four elements determine the dynamics at the local level.
Only if the maximum peat compaction potential at a certain location has been reached, while at a nearby location on the floodplain rates of subsidence due to peat compaction are still relatively ...
Conceptual models for short‐eccentricity‐scale climate control on peat
Vertical aggradation within the channel belt prevails because there is sufficient accommodation space and avulsion is not triggered by differential compaction since the high frequency of crevasse splaying prevents significant peat formation on the floodplain. Only minor peat develops on the floodplain during episodes of minimal seasonal ...
Peat formation in the context of the development of the …
However, in systems where the toe of the drainage line is gradually rising owing to clastic sedimentation on the adjacent floodplain, the estimated rate of peat accumulation must be more rapid as peat accumulation integrates compaction rate, feedback of peat formation on the elevation of the water table, and a gradually rising water level from ...
Peat compaction in deltas : implications for Holocene delta evolution
Only if the maximum peat compaction potential at a certain location has been reached, while at a nearby location on the floodplain rates of subsidence due to peat compaction are still relatively ...
Sedimentology
In addition to compaction, present floodplain topography may also influence calculated long-term average floodplain sedimentation rates, because sediment thickness to a radiocarbon-dated stratigraphic level tends to be greater beneath a natural levée than beneath a floodbasin. ... near the edges of the floodplain. Because peat …
The relative contribution of peat compaction and …
The relative contribution of peat compaction and oxidation to subsidence in built-up areas in the Rhine-Meuse delta, The Netherlands. Author links open overlay panel Sanneke van Asselen a, ... During the formation of these floodplain forms arose on the surface of highly compactable peat, then transformed into lignite, in …
-Effective stress versus percentage of compaction of 14
Download scientific diagram | -Effective stress versus percentage of compaction of 14 analyzed cores. from publication: Factors Controlling Peat Compaction in Alluvial Floodplains: A Case Study in ...
(PDF) Quantifying the Role of Floodplain Peat in …
Results show that peat layers have compacted up to 43% within a few centuries, with compaction rates of up to 6.08 mm/yr. The dominant factors influencing peat compaction …
(PDF) Effects of peat compaction on delta evolution: A …
An overview is given numerical compaction models regarding: 1) the compaction process, 2) presumed and potential effects of peat compaction on delta evolution, 3) field …
The relative contribution of peat compaction and oxidation …
Request PDF | The relative contribution of peat compaction and oxidation to subsidence in built-up areas in the Rhine-Meuse delta, The Netherlands | An increasing number of people lives in coastal ...
Depositional record of an avulsive fluvial system controlled …
Two main, mutually linked, processes controlled the evolution of the studied fluvial system: (i) syndepositional compaction of the underlying peat and (ii) avulsions …
The relative contribution of peat compaction and oxidation …
Peat compaction and oxidation, caused by loading and drainage, are important contributors to land subsidence, and hence relative sea-level rise, in peat-rich …
(PDF) The compaction of floodplain sediments: Timing
The compaction of floodplain sediments: Timing, magnitude and implications. March 1997; ... Due to the tectonic activity and high compaction properties of peat/lignite, the interseam sands were ...
Sensitivity of floodplain geoecology to human impact: A …
Post-depositional compaction of peat and peaty deposits can lead to an underestimation of the peat growth rate and consequently to an underestimation of floodplain accumulation rates.
-Mossy River cross section. For legend see Figure 2.
A lowering of the crevasse-splay body can be explained by sudden compaction of the underlying peat. Of course, the compaction ratio for peat is much higher than for other floodplain clastic ...
Modelling long-term alluvial-peatland dynamics in temperate …
Abstract. Peat growth is a frequent phenomenon in European river valleys. The presence of peat in the floodplain stratigraphy makes them hotspots of carbon storage. The long-term dynamics of alluvial peatlands are complex due to interactions between the peat and the local river network, and as a result, alluvial-peatland …
Magnitude and timing of peat-to-coal compaction
The peat-to-coal transition is commonly assumed to be accompanied by compaction that decreases the thickness of the organic deposit to values of 10% or less of the original peat thickness.
Effects of peat compaction on delta evolution: A review on …
Peat compaction and formation are key processes in delta evolution, especially in distal parts with relatively high accommodation rates where thick peat layers are formed in the flood basins. The way and magnitude by which peat compaction and formation influence delta architecture strongly depend on temporal and spatial scale.
Factors controlling peat compaction in alluvial floodplains: a …
To determine which locations within alluvial floodplains are most vulnerable to high amounts of compaction-induced subsidence, it is necessary to quantify …
(PDF) Quantifying the Role of Floodplain Peat in …
Sheet-like splay deposits initially compact underlying peat uniformly, whereas differential compaction commonly occurs beneath natural levees due to lateral variations in sediment thickness. Subsidence due to peat compaction creates additional accommodation space and hence locally enhances floodplain sedimentation rates.
Factors Affecting the Accumulation of Organic-Rich Deposits …
Since the 1870s, the Saskatchewan River at the Cumberland Marshes (east-central Saskatchewan, Canada) has been undergoing progradational avulsion, resulting in development of a 500 km2 avulsion belt. The avulsion belt consists of an unstable network of active and abandoned channels, splays, and floodbasins, some containing small …
-North Angling Channel cross section. For location see …
A lowering of the crevasse-splay body can be explained by sudden compaction of the underlying peat. Of course, the compaction ratio for peat is much higher than for other floodplain clastic ...
Contribution of peat compaction to relative sea-level rise …
Many deltaic sedimentary successions include substantial amounts of peat, which is highly compressible compared to clay, silt and sand. Peat compaction, therefore, may contribute considerably to total delta subsidence accelerating the rate and enhancing the amount of relative sea-level rise, increasing flooding risk within these low-lying, often densely …
Greenhouse gas emissions resulting from conversion of peat …
The magnitude of greenhouse gas emissions from land use change on tropical peatlands is unclear. Here, the authors measure greenhouse gas fluxes throughout the conversion from peat swamp forest to ...