At the same time, subsidence is reduced by compaction with heavy machinery as practised in oil palm estates to allow anchorage of trees and to increase the bearing capacity of the land. ... However, in contrast to the quantification of the peat subsidence versus time relationship, a much smaller data set was available for the …Web
قرأ أكثر
Therefore, we quantified subsidence due to peat compaction and oxidation in built-up areas in the Rhine-Meuse delta, The Netherlands, using lithological borehole data and measurements of dry bulk ...Web
قرأ أكثر
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 river sedimentation patterns, and hence the evolution of alluvial floodplains.Web
قرأ أكثر
Subsidence due to peat compaction is highly variable in time and space, with local rates of up to 15 mm/yr, depending on sedimentary sequence. This is extremely important information for developing sound delta management strategies. Artificial groundwater table lowering may cause substantial additional subsidence. Subsidence …Web
قرأ أكثر
Heterotrophic soil respiration and subsidence are enhanced by water table decline, with a meta-analysis estimating that soil respiration in drained peatlands across the globe release 645 Mt carbon ...Web
قرأ أكثر
In our study area, the potential for future subsidence due to peat compaction and oxidation is substantial, especially where the peat layer occurs at shallow depth and is relatively uncompacted. We expect this is the case for many peat-rich coastal zones worldwide. We propose to use subsurface-based spatial planning, using specific …Web
قرأ أكثر
Data on peat subsidence and oil palm yields were collected from 10 blocks of oil palm of different ages planted on peat of different depths ranging from shallow to deep peat. A regression equation was established with subsidence data as a dependent variable, while ground water-table and time with quadratic effects were independent variables.Web
قرأ أكثر
Compaction of hydrocarbon reservoirs continues for decades even after production stops, so any decreases in hydrocarbon extraction will not immediately stop the related subsidence. The …Web
قرأ أكثر
the compaction of Holocene coastal organic-rich deposits and demonstrated its profound stratigraphic implications, and recent field investigations17 continue to single out peat compaction as a key control of coastal evolution. Nevertheless, although present-day compaction rates ('shallow subsidence') have been measuredWeb
قرأ أكثر
They observed initial rates of subsidence up to 75 cm yr −1 from compaction after drainage, followed by long-term subsidence rates up to 5 cm yr −1 from oxidation …Web
قرأ أكثر
Pristine peatlands—i.e., peatlands (where peat soil has at least 30% dry organic matter and a peat depth generally exceeding 40 cm 1) that have thus far not …Web
قرأ أكثر
Repeat measurement of peat surface elevation and subsidence (via stakes anchored in the mineral substrate or via remote sensing) may encompass fire events (Hoyt et al., 2020, Wösten et al., 1997) but requires assumptions about compaction (changes in peat bulk density and C density) and cannot account for within-peat heterotrophic …Web
قرأ أكثر
The drainage and cultivation of peatlands will lead to subsidence and mineralisation of organic matter, increasing carbon (C) loss as more CO2 is emitted. There is little information about carbon …Web
قرأ أكثر
Over time, subsidence increases the risk of periodic flooding or inundation of land, and may lead to a reduction in productivity. Subsidence results from a combination of compaction (shrinkage) of the dry peat, and accelerated decomposition following its exposure to oxygen, which contributes to CO 2 emissions from drained peatlands.Web
قرأ أكثر
Vertical displacement rates at this boundary, averaged over 750–1,500 years, are on the order of a few mm/yr. Total subsidence scales to ∼50% of the thickness of overlying deposits, significantly greater than the 28%–35% loss estimated for inland localities underlain by peat, indicating that bay muds in the study area are more …Web
قرأ أكثر
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 …Web
قرأ أكثر
Peat oxidation results in volume reduction (subsidence) and CO 2 gas emissions. In addition, the drained peat loses its buoyancy and loads the underlying peat that starts to consolidate, resulting in further subsidence. Whereas shrinkage and consolidation contribute mostly to subsidence in the first years after drainage, the …Web
قرأ أكثر
Subsidence due to peat compaction potentially influences temporal and spatial sedimentation patterns, and therefore alluvial architecture. Quantification of the amount and rate of peat compaction was done based on (1) estimates of the initial dry bulk density of peat, derived from a relation between dry bulk density and organic-matter …Web
قرأ أكثر
Subsidence by peat compaction and oxidation severely impacts built-up coastal areas. • Field data shows that this type of subsidence is highly variable in time …Web
قرأ أكثر
Peat subsidence is also triggered by a combination of processes, such as compaction by heavy equipment, the construction of settlements and roads, shrinkage through the contraction of organic fibers when drying and consolidation by loss of water from pores in the peat. Peat subsidence is also caused by the decomposition and …Web
قرأ أكثر
Other processes that can contribute to peat subsidence include fire, compaction due to stock treading and machinery, wind and water erosion. Peat subsidence generally decreases over time, but will continue as long as the soils remain drained, until the drained peat disappears.Web
قرأ أكثر
Subsidence occurs due to a combination of compaction (compression of aerated peat), consolidation (compression of peat below the water table due to loss of buoyancy of overlaying peat), and oxidation (aerobic decomposition of organic matter to CO 2) (Evans et al. 2019). Given that peat contains around 90% water, draining the water out of theWeb
قرأ أكثر
Wösten et al., 1997 and Ansahri et al., 2021 [19,49] used oxidized subsidence factor 0.6 to calculate C loss from each subsided peat cm, using assumption that 60% of subsidence is peat mineralization but …Web
قرأ أكثر
The amount of subsidence due to peat compaction is variable in space and time, mainly depending on (1) overburden weight, (2) time since loading, and (3) organic …Web
قرأ أكثر
Peat subsidence is also triggered by a combination of processes, such as compaction by heavy equipment, the construction of settlements and roads, shrinkage …Web
قرأ أكثر
Subsidence due to peat compaction may have important implications in alluvial floodplains, because it leads to wetland loss, land inundation, and damage to …Web
قرأ أكثر
In addition, compaction of aerenchyma and/or root channels under conditions of vegetation death/decline is also a mechanism for soil volume reduction and thus shallow soil subsidence (Chambers et al. 2019). Peat collapse at rates of 11 mm year −1 was reported from a mangrove forest in Honduras due to mass tree mortality and root death …Web
قرأ أكثر
Compared to existing estimates, present subsidence rates due to peat compaction predicted by the model are much lower (<0.2 mm!yr) where peat is overlain by a substantially thick (>-1 m) clastic ...Web
قرأ أكثر
Sources/Usage: Public Domain. The dominant cause of land subsidence in the Sacramento-San Joaquin Delta is decomposition of organic carbon in the peat soils. Under natural waterlogged conditions, the soil was anaerobic (oxygen-poor), and organic carbon accumulated faster than it could decompose. Drainage of peat soils for …Web
قرأ أكثر
Natural compaction of Holocene age deposits, often amplified by peat soil oxidation due to surface water drainage, is one of the main processes that causes coastal subsidence. Subsidence rates can ...Web
قرأ أكثر
In conjunction with the age of formation of the peat layer, Törnqvist et al. [44••] calculated averaged rates of compaction-induced subsidence of up to 5 mm year −1. They also suggested that compaction could create land level lowering rates of up to 10 mm year −1 over shorter timescales, given the non-linear decline in the rate of ...Web
قرأ أكثر
The size of peat subsidence at Solec peatland (Poland) over 50 years was determined. The field values for subsidence and mineralization were compared with estimates using 20 equations. The subsidence values derived from equations and field measurements were compared to rank the equations. The equations that include a …Web
قرأ أكثر
Subsidence by peat compaction and oxidation severely impacts built-up coastal areas. • Field data shows that this type of subsidence is highly variable in time and space. • This variability mostly relates to subsurface buildup and characteristics and groundwater depth. • We expect a considerable subsidence potential in many peat-rich ...Web
قرأ أكثر
The relative stability of peat elevations during the wet January-April periods in both 2019 and 2020, when hydrological conditions were similar, suggests that the net change between these two periods represented long-term subsidence (i.e., peat oxidation and compaction) rather than a short-term shrink-swell response to drying and re-wetting.Web
قرأ أكثر
In this study, we analyse temporal variations and the long-term trajectory of subsidence in a uniquely long-term (12 year), large-scale and methodologically …Web
قرأ أكثر
Soil carbon dioxide (CO 2) efflux was measured continuously for two years using an automated chamber system in an oil palm plantation on tropical peat.This study investigated the factors controlling the CO 2 efflux and quantified the annual cumulative CO 2 emissions through soil respiration and heterotrophic respiration, which is equivalent to …Web
قرأ أكثر
Coastal plains are amongst the most densely populated areas in the world. Many coastal peatlands are drained to create arable land. This is not without consequences; physical compaction of peat and its degradation by oxidation lead to subsidence, and oxidation also leads to emissions of carbon dioxide (CO2). This study complements …Web
قرأ أكثر