This behaviour has been studied mainly by geomorphologists and fluid dynamicists. Bifurcations also exist during avulsion, the process of a river changing course on a floodplain or in a delta, which may take 10 2 –10 3 years and has been studied mainly by sedimentologists. This review synthesizes our current understanding of …
Using a Monte Carlo approach, the range of probable compaction rates for stratigraphies with compacted thicknesses <150 m and accumulation times <20 kyr. varies, but maximum values rarely exceed a few mm yr −1. The fastest compacting stratigraphies are composed primarily of peat and bar sand, whereas the slowest compacting …
The impact of avulsion on groundwater level and peat formation in delta floodbasins during the middle-Holocene transgression in the Rhine-Meuse delta, The Netherlands April 2017 The Holocene 27(7)
Peat compaction, therefore, may contribute considerably to total delta subsidence. Existing studies are inadequate for quantifying peat compaction across deltas. We present a numerical peat compaction …
The dominant factors influencing peat compaction are: (1) organic-matter content, (2) stress imposed on a peat layer, and, to a lesser extent, (3) plant species composition.
Places of highest flood-basin subsidence due to peat compaction caused by either consolidation or sediment-overburden, may trigger channel avulsion (e.g. Fielding, 1984; Van Asselen et al., 2009 ...
200 BCE 200 CE Legend peat surface level elevation (MSL) -1 correcting for compression FEEDBACKS LEADING TO AVULSION SUCCESS and oxidation -2 low peat-surface level The results show that human impacts—peatland subsidence and water correcting for compression increased suspended sediment load—on the river, estuary, and peatlands …
of peat compaction, leading to enhancement of autogenic channel avulsions. In model 2, orbitally forced climate change controls upstream sediment sup- ply and clastic influx determining the ...
Subsidence rates, due peat compaction, may be as high as 15 mm/yr. Human-induced peat compaction and oxidation may even lead to subsidence rates on the order of a few cm/yr.
This paper illustrates the response of a fluvial depositional system to the interplay between peat compaction and clastic sediment supply, at a range of spatial and temporal scales, as documented by extensive exposures in an open‐cast mine in the Most Basin, part of the Oligo‐Miocene Ohře Rift (Eger Graben) basin system in the Czech …
avulsion of the Saskatchewan River invaded a peatland, thereby partly burying an up to 2-m-thick Late Holocene fen peat layer overlying an incompressible substrate, by up ... space created by peat compaction after deposition of a new layer is filled by increased peat formation or clay deposition during the next time step. The level to which ...
The dominant factors influencing peat compaction are: (1) organic- matter content, (2) stress imposed on a peat layer, and, to a lesser extent, (3) plant species composition. In an alluvial setting,
Artificial groundwater table lowering may cause substantial additional subsidence. Subsidence due to peat compaction might even exceed estimates of relative sea-level rise, and thus, may seriously increase the risk of delta drowning and human vulnerability to flooding. ... in the 1870s an avulsion of the Saskatchewan River invaded …
Peat compaction and formation influence channel belt elevation, channel belt geometry and channel belt configuration. Last-mentioned aspect mostly concerns the …
Request PDF | Factors controlling the amount and rate of peat compaction on timescales of 10-100 years (Cumberland Marshes, Canada) | Subsidence due to peat compaction may have important ...
Peat compaction and formation potentially influence avulsion as 1) a decrease in accommodation space created by peat compaction underneath a channel causes superelevation and/or an increase in lateral migration, 2) the high cohesiveness of peat banks inhibits lateral migration, which increases bed aggradation, decreases …
Basal peat samples come from strata that directly overlie sandy aeolian sediments, minimizing compaction effects in the curves. The basal peats sampled for these reconstructions are swamp peat and fen-edge peat (Alnus peat, that is, alder peat), which form approximately at or slightly below the annual mean groundwater table (Charman, …
Furthermore, peat compaction may influence the occurrence of avulsion (Michaelsen et al., 2000; Rajchl and Uličný, 2005). Avulsion, the partial or full abandonment of a channel in favour of a ...
The dominant factors influencing peat compaction are: (1) organic-matter content, (2) stress imposed on a peat layer, and, to a lesser extent, (3) plant species composition. ... The pre-avulsion peat layer is typically several tens of centimeters thick and usually ranges from a few centimeters to a maximum observed thickness of 1.3 m. It is ...
Compaction of peat, underlying natural levees, may also result in higher local aggradation rates, but this is especially important in the western part of the delta (west of coordinate x = 130). Download : Download full-size image; Fig. 7. Local and regional aggradation rates plotted in a W–E section versus time. Left: 14 C yr BP, right: cal ...
Subsidence rates, due peat compaction, may be as high as 15 mm/yr. Human-induced peat compaction and oxidation may even lead to subsidence rates on the order of a few cm/yr.
Subsidence due to peat compaction may have important implications in alluvial floodplains, because it leads to wetland loss, land inundation, and damage to buildings and infrastructure. Furthermore, it potentially influences spatial and temporal.
Humans are known to have deliberately triggered avulsion directly, by constructing canals and dams (e.g., Heyvaert and Walstra, 2016 ), but less is known …
Peat deposition and compaction in response to orbital-scale climate changes: the formation of lower Paleocene coal repetitions in Montana (USA) July 2017 Conference: The 11th International ...
Subsidence rates, due peat compaction, may be as high as 15 mm/yr. Human-induced peat compaction and oxidation may even lead to subsidence rates on the order of a few cm/yr.
Peat is most compressible of all natural soils. Compaction of peat layers potentially leads to substantial amounts of land subsidence. Peat is common in many distal parts of Holocene deltas, which are often densely populated. It is known that land subsidence due to peat compaction may have serious societal implications in such areas, as it may cause …
... The spatial analysis of the SAR data and stratigraphic architecture has demonstrated that the major ground deformation occurs within the perimeter of the …
Article on Effects of peat compaction on delta evolution: A review on processes, responses, measuring and modeling, published in Earth Science Reviews 92 on by S. van Asselen+1. Read the article Effects of peat compaction on delta evolution: A review on processes, responses, measuring and modeling on R Discovery, …
Conceptual model 1 for short-eccentricity-driven climate control on peat formation in the Tullock Member illustrated in five stages. Timing of peat compaction and autogenic …
in precipitation. The autogenic avulsion model is widely adopted in studies on coal-bearing flu-vial successions. It considers differential peat compaction as a major autogenic control on channel avulsion resulting in diagonally stacked channel sandstones over time (e.g. Fielding, 1984). However, in many cases, the repetitive
Partly based on these studies, ignoring the difference in time scale, potential influences of peat compaction on avulsion in Holocene settings are derived: 1) When a river invades a peatland, accommodation space is created by peat compaction underneath the channel, which initially leads to vertical aggradation. Through time, the rate of ...
Peat compaction and formation potentially influence avulsion as 1) a decrease in accommodation space created by peat compaction …
(DOI: 10.1016/J.EARSCIREV.2008.11.001) Peat is most compressible of all natural soils. Compaction of peat layers potentially leads to substantial amounts of land subsidence. Peat is common in many distal parts of Holocene deltas, which are often densely populated. It is known that land subsidence due to peat compaction may have serious societal …
Abstract This paper illustrates the response of a fluvial depositional system to the interplay between peat compaction and clastic sediment supply, at a range of spatial and temporal scales, as doc...
Peat compaction, therefore, may contribute considerably to total delta subsidence. Existing studies are inadequate for quantifying peat compaction across deltas. We present a numerical peat compaction model calibrated with an extensive field dataset. The model quantifies spatial and temporal trends in peat compaction within fluvial …
Peat compaction underneath natural levees, and crevasse splay deposits, fixes river channels and prevents renewed avulsion, arguable the most important process controlling sediment distribution in ...
