TY - JOUR
T1 - Subsidence of dredged organic sediments in cultivated peatlands
AU - Van Paassen, Leon A.
AU - Oliveira, Bruna R.F.
AU - Zain, Nor H.M.
AU - Jommi, Cristina
N1 - Funding Information:
This work had the financial support of the Dutch Technology Foundation STW, which is part of the Netherlands Organization for Scientific Research (NWO). It was also partly funded by the Ministry of Economic Affairs, via the perspective program BioGeoCivil (grant 11344), and through the CEAMaS (Civil Engineering Applications for Marine Sediments) project, which was supported by the European Regional Development Funding Through INTERREG IV B and the Public Service Department of Malaysia and Universiti Teknologi MARA, Malaysia. Authors like to thank Mr. Arno Mulder of Delft University of Technology and Mr. Karsten Hopman of Hoogheemraadschap Hollands Noorderkwartier (HHNK) for his help in the field study.
Publisher Copyright:
© The Authors, published by EDP Sciences 2020.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/16
Y1 - 2020/10/16
N2 - Many low-lying peatlands in delta areas undergo significant subsidence due to drainage for agricultural purposes. Subsidence may be attributed to shrinkage, consolidation or oxidation. At the same time the canals and ditches are regularly dredged to maintain water quality and drainage capacity. Often these dredged sediments are placed on land, which may help to slow down subsidence. In this study subsidence of organic sediments was monitored for a period of three years. The sediments were dredged from lakes and canals in the peatlands of Wormer- en Jisperveld, in the Netherlands and placed in an on-land constructed depot. Samples were collected at regular time intervals to measure water content and organic content. Additionally, laboratory tests were performed to characterize the organic sediments and determine the compression, consolidation, shrinkage and water retention characteristics under various oxidizing conditions. The laboratory tests showed that oxidation can significantly affect the compression, consolidation, water retention and shrinkage characteristics of organic soils. However, monitoring results in the field showed that the major part of the subsidence, which occurred within the three years of this study, could be attributed to shrinkage of the dredged sediments and the remainder to consolidation of the underlying peat layers, while the organic matter content did not change significantly.
AB - Many low-lying peatlands in delta areas undergo significant subsidence due to drainage for agricultural purposes. Subsidence may be attributed to shrinkage, consolidation or oxidation. At the same time the canals and ditches are regularly dredged to maintain water quality and drainage capacity. Often these dredged sediments are placed on land, which may help to slow down subsidence. In this study subsidence of organic sediments was monitored for a period of three years. The sediments were dredged from lakes and canals in the peatlands of Wormer- en Jisperveld, in the Netherlands and placed in an on-land constructed depot. Samples were collected at regular time intervals to measure water content and organic content. Additionally, laboratory tests were performed to characterize the organic sediments and determine the compression, consolidation, shrinkage and water retention characteristics under various oxidizing conditions. The laboratory tests showed that oxidation can significantly affect the compression, consolidation, water retention and shrinkage characteristics of organic soils. However, monitoring results in the field showed that the major part of the subsidence, which occurred within the three years of this study, could be attributed to shrinkage of the dredged sediments and the remainder to consolidation of the underlying peat layers, while the organic matter content did not change significantly.
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U2 - 10.1051/e3sconf/202019501020
DO - 10.1051/e3sconf/202019501020
M3 - Conference article
AN - SCOPUS:85097173272
VL - 195
JO - E3S Web of Conferences
JF - E3S Web of Conferences
SN - 2555-0403
M1 - 01020
T2 - 4th European Conference on Unsaturated Soils, E-UNSAT 2020
Y2 - 19 October 2020 through 21 October 2020
ER -