peat compaction avulsion

Effect of soil type, peat, slope, compaction effort and …

 · Compaction of the soil was found to increase surface runoff and decrease infiltration and soil loss. Results from this study confirm that the major reason why peat reduces soil erosion by rainfall is its effect in decreasing bulk density, increasing infiltration, and

Effects of peat compaction on delta evolution: A review …

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).

The impact of avulsion on groundwater level and peat …

Avulsion has caused local accelerations of rising groundwater tables to be superimposed on decelerating base-level rise. This is evident from comparing single-site groundwater rise for multiple floodbasins in the river-dominated part of the delta, with regionally averaged groundwater-rise …

The influence of peat compaction on river channel …

Aim: (1) determine the magnitude and rate of compaction using field data from the Holocene Rhine-Meuse delta and other sources, (2) determine how compaction influences topographic slopes, (3) examine avulsion sites and river courses in order to determine if ...

Hydraulic properties of peat soils along a bulk density …

The results show that the hydraulic parameters of peat soils vary over a wide range confirming the pronounced diversity of peat. Peat decomposition significantly modifies all hydraulic parameters. A bulk density of approximately 0.2 g cm −3 was identified as a critical threshold point; above and below this value, macroporosity and hydraulic parameters follow different functions with bulk ...

Peat compaction in deltas : implications for Holocene delta …

Request PDF | Peat compaction in deltas : implications for Holocene delta evolution | Many deltas contain substantial amounts of peat, which is the most compressible soil type. Therefore, peat ...

Effects of peat compaction on delta evolution: A review on …

Peat compaction and formation influence channel belt elevation, channel belt geometry and channel belt configuration. Last-mentioned aspect mostly concerns the influence of peat compaction on avulsion, which is one of the most important processes controlling

© The Author(s) 2017 level and peat formation in delta

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

Contribution of peat compaction to relative sea‐level rise …

 · Contribution of peat compaction to relative sea‐level rise within Holocene deltas Contribution of peat compaction to relative sea‐level rise within Holocene deltas Asselen, S.; Karssenberg, D.; Stouthamer, E. 2013-04-28 00:00:00 Modern and forecasted flooding of deltas is accelerated by subsidence of Holocene deposits.

peat compaction controlling

peat compaction is an important mechanism controlling the development of natural levees of low gradient rivers Peat compaction underneath natural levees and crevasse splay deposits fixes river channels and prevents renewed avulsion arguable the most ...

Peat compaction in deltas. Implications for Holocene delta …

TY - THES T1 - Peat compaction in deltas. Implications for Holocene delta evolution AU - van Asselen, S. N1 - Naam instelling promotie: Utrecht University PY - 2010 Y1 - 2010 M3 - PhD Thesis - Research VU Amsterdam, graduation external PB - Netherlands

Depositional record of an avulsive fluvial system controlled …

According to careful sedimentological work by Rajchl and Uličný (2005),Rajchl et al. (2008), andMach et al. (2014), the peat compaction triggered local avulsions of tributaries or distributary ...

peat compaction controlling

Experience with hydraulic fill compaction demonstrates that pumping water into a peat marsh fill under controlled conditions has an immediate stabilizing effect on the embankment. The adjustments and movements obtained would otherwise take place slowly over a period of years and result in detrimental pavement settlement.

Peat compaction in deltas : implications for Holocene …

Many deltas contain substantial amounts of peat, which is the most compressible soil type. Therefore, peat compaction potentially leads to high amounts of subsidence in deltas. The main objective of this research was to quantify subsidence due to peat compaction in Holocene fluvial-deltaic settings and to evaluate effects of peat ... read more compaction on delta evolution.

Effects of peat compaction on delta evolution: A review on …

 · 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

Peat compaction in the long term

Peat compaction in the long term A study into the spatial effects of peat compaction in peat lands D. Gideonse 20-1-2014 Keywords: peat compaction, impact, spatial planning, long term and short term, transition and transformation, policy, politics, decision

FACTORS CONTROLLING PEAT COMPACTION IN ALLUVIAL …

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,

Effects of peat compaction on delta evolution: A review on processes, responses, measuring and modeling …

The impact of avulsion on groundwater level and peat Apr 19, 2017 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 ...

Carbon loss estimates from cultivated peat soils in …

 · Drainage and cultivation of peat soils stimulates soil organic matter (SOM) mineralization, which substantially increases CO2 emissions from soils. Large uncertainties are associated with this CO2 flux, and little data are available, especially in Norway. The objective of the present research was to estimate C losses from cultivated peatlands in West Norway by three independent methods: (1 ...

The impact of avulsion on groundwater level and peat …

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 van Asselen, Sanneke Cohen, Kim M.

10.1016/j.earscirev.2008.11.001 | …

 · As peat has the highest compaction potential of all natural soils, compaction of peat potentially leads to substantial amounts of land subsidence. This may result in many societal implications including damage to construction works and relative sea …

Causes of Avulsion: An Overview

 · Avulsion, i.e. the relatively sudden displacement of a river channel, has an important effect on sediment distribution and on architecture of fluvial deposits because avulsion is a primary control on channel location on a floodplain. Most avulsions occur when a triggering event, commonly a flood, forces a river across a stability threshold.

(PDF) Human-caused avulsion in the Rhine-Meuse delta …

Although the shifting of deltaic river branches (avulsion) is a natural process that has become increasingly influenced by humans, the impact of early human activities as a driver of avulsion success has remained poorly explored. This study

Oxidation and compaction of a collapsed peat dome in …

 · Peat domes in Kalimantan (Indonesia) are reported to loose their dome shape as a result of disturbance such as logging and artificial drainage. The loss of the dome shape can be caused by (a combination of) two major processes: compaction and oxidation.

(PDF) Deltaic subsidence due to compaction, isostacy and …

The hind casting of compaction with our numerical models uses observations from the Cumberland Marshes (Canada), an inlanddelta case of avulsion splay formation that is monitored over the last 135 years (river clastics burying peat).

The contribution of peat compaction to total basin …

In the Rhine-Meuse delta, peat compaction has contributed considerably to total basin subsidence. Depending on the thickness of the compressible sequence, weight of the overburden and organic-matter content of peat, subsidence of up to approximately 3 m in …

Peat Compaction Effect

Effects of peat compaction on delta evolution: A 2009-1-1 Peat compaction and formation potentially influence avulsion as 1) a decreas Contribution of peat compaction to relative sea‐level The effect of this has been simulated by assuming 100 years of constant clay ...

Contribution of peat compaction to relative sea‐level rise …

 · 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.

Peat Archives: The Key To Unravel The Influence Of Peat …

 · 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 deltas.

Human-caused avulsion in the Rhine-Meuse delta before …

Unembanked areas within these deltas that have a compaction-prone substrate, in particular, may be sensitive to freely occurring avulsion. The Rhine-Meuse delta case highlights the sensitivity of deltas to human impact and emphasizes the need for an integrated understanding of tidal, fluvial, and catchment processes for knowledge-based river and delta management.

A relationship between alluvial backswamps and …

 · Compaction ratios for organic-rich fine-grained sediments are on the order of 4:1–8:1 (Collinson and Thompson, 1989). For the basal carbonaceous shale, which was not a true peat and contains only thin stringers of lignite, an average compaction ratio of about 6

peat compaction avulsion

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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 of the channels away from the original floodplain, resulting in formation of a new floodplain.

Contribution of peat compaction to relative sea-level rise within Holocene deltas

Contribution of peat compaction to relative sea-level rise within Holocene deltas S. van Asselen,1 D. Karssenberg,1 and E. Stouthamer1 Received 28 September 2011; revised 9 November 2011; accepted 10 November 2011; published 20 December 2011. …

Effects of peat compaction on delta evolution: A review on …

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).

The contribution of peat compaction to total basin …

 · In the Rhine‐Meuse delta, peat compaction has contributed considerably to total basin subsidence. Depending on the thickness of the compressible sequence, weight of the overburden and organic‐matter content of peat, subsidence of up to approximately 3 m in a 10‐m thick Holocene sequence has been calculated.

The impact of avulsion on groundwater level and peat …

 · In addition to its effects on groundwater tables, avulsion also affects peat formation, because of the changes in average water depth, sediment delivery, nutrient status and acidity. Such avulsion-induced changes promoted shifts from relatively high-organic wood

Calibrated density profiles of Caribbean mangrove peat …

 · Calibrated density profiles of Caribbean mangrove peat sequences from computed tomography for assessment of peat preservation, compaction, and impacts on sea-level reconstructions - Volume 89 Issue 1 PREVIOUS WORK Toscano and Macintyre (Reference Toscano and Macintyre 2003) reconstructed Caribbean Holocene SLR as the western Atlantic sea level (WASL) …

(PDF) Factors Controlling Peat Compaction in Alluvial …

Most peat compaction at the Overburden NAC and MR sites is likely induced by the overburden deposited after the 1870s avulsion, so most compaction has occurred within Based on aerial photographs and historical maps, we estimate a the Muskeg Lake Splay (Fig. 1).

Tracing the Anthropocene in the Rhine-Meuse delta

avulsion; large-scale peat excavation; reclamation and drainage of flood basins resulting in compaction and oxidation of peat; river embankment preventing delta-wide overbank deposition and finalizing avulsion; channelization, changing channel belt ...

Conceptual models for short‐eccentricity‐scale climate …

 · In conceptual model 1, differential peat compaction, leading to river avulsion, is paced during increasing eccentricity at times of minimum precession. High seasonal contrast leads to drying and oxidation, hence compaction, of the peat during the dry season, and enhanced discharges lead to crevasse splaying during the wet season.