Article
Geography, Physical
Julianne Scamardo, Peter A. Nelson, Mary Nichols, Ellen Wohl
Summary: Compared to perennial streams, there is a lack of studies investigating the impact of large wood on sediment transport and river corridor morphology in ephemeral streams. Both large wood and vegetation effectively confine flow to the main channel, causing it to become wider and deeper. Large wood enhances channel change caused by vegetation, but vegetation has a greater influence on channel morphology due to its larger area within the stream corridor.
Article
Forestry
Mathilde Monachon, Charlene Pele-Meziani, Sathiyanarayanan Ganesan, Sabine de Weck, Friederike Moll-Dau, Janet Schramm, Katharina Schmidt-Ott, Edith Joseph
Summary: An innovative bio method was compared with a chemical treatment to extract harmful iron and sulfur species from waterlogged wood samples. Non-invasive and non-destructive methods were used to investigate both approaches. The results showed that some wood genera were more affected by the bio approach, while the chemical approach showed potential harm for the wooden structure.
Review
Forestry
Magdalena Broda, Callum A. S. Hill
Summary: This paper examines degradation, preservation, and conservation techniques for waterlogged archaeological wood, including the effects of bacteria and fungi in oxygenated and anoxic conditions, consolidants for post-excavation preservation, and the merits and risks of reburial and in situ preservation as alternatives to traditional conservation methods.
Article
Forestry
Jong Sik Kim, Mi Young Cha, Kwang Ho Lee, Yoon Soo Kim
Summary: This study investigated the bacterial decay process in compression wood (CW) tracheids of waterlogged archaeological wood (WAW) using various microscopy techniques. Erosion bacteria were identified as the primary degraders, and the extent of cell wall degradation varied depending on the severity of CW tracheids. Mild CW tracheids showed preferential decay in the inner S-2 layer, while severe CW tracheids exhibited gradual degradation of the cell wall from the exposed faces. The degradation was more extensive in mild CW tracheids, and the highly lignified outer S-2 layer was only degraded in mild CW tracheids.
Article
Geosciences, Multidisciplinary
Tomas Galia, Radek Tichavsky, Andrea Fabianova, Vilem Spalovsky
Summary: Research focused on the recruitment and distribution patterns of large wood (LW) in headwater streams of forested mountain regions, where disturbances play a crucial role in determining the final distribution of LW. Analysis revealed that streams impacted by blowdowns had the highest LW volume and a uniform longitudinal distribution, while streams affected by high-magnitude cascade recruitment-transport processes had the lowest LW volume and irregular distribution. Dendroecological dating further showed that a significant percentage of LW died during specific periods due to disturbances, with different growth patterns observed in response to varying levels of disturbance intensity.
Article
Ecology
Giancarlo Sidoti, Federica Antonelli, Giulia Galotta, Maria Cristina Moscatelli, Davor Krzisnik, Vittorio Vinciguerra, Swati Tamantini, Rosita Marabottini, Natalia Macro, Manuela Romagnoli
Summary: In this study, the mineral content in waterlogged archaeological wood (WAW) and its relationship with surrounding volcanic lake sediments were investigated. Calcium was found to be the most abundant element in all wood samples, with higher concentrations in heartwood. Arsenic was also present in both wood and sediment samples, indicating a possible connection to volcanic origin and biogeochemical processes.
Article
Forestry
Huimin Cao, Xin Gao, Jiabao Chen, Guanglan Xi, Yafang Yin, Juan Guo
Summary: Studying the moisture characteristics of waterlogged archaeological wood can provide support for the dehydration and preservation of such artifacts. In this study, waterlogged wood samples from ancient Chinese shipwrecks and modern wood samples were analyzed to understand the deterioration states and the relationship between moisture content and wood deterioration. It was found that the deterioration of wood led to increased fiber saturation point values, mainly due to changes in pore size distribution. NMR was found to be more accurate than DVS in obtaining these values for severely degraded samples.
Article
Ecology
Christopher Clark, Michelle Krall, Phil Roni, Kevin Ceder
Summary: Climate change is projected to significantly increase stream temperatures in the Columbia River Basin, negatively impacting salmonid fishes. Despite efforts to use large wood placement to mitigate these effects, studies show that current projects do not effectively decrease summer water temperatures or create cool water refuges for fishes.
RESTORATION ECOLOGY
(2021)
Article
Chemistry, Physical
Magdalena Broda, Morwenna J. Spear, Simon F. Curling, Graham A. Ormondroyd
Summary: The treatment with methyltrimethoxysilane effectively stabilizes wood dimensions and enhances mechanical strength, while also reducing wood hygroscopicity. However, it also has a plasticizing effect on the treated wood.
Article
Forestry
Eirini Mitsi, Stamatis Boyatzis, Anastasia Pournou
Summary: This study investigated the chemistry of wood from a medieval shipwreck discovered in 2008 at the port of Rhodes, Greece. It revealed significant chemical differences among the wood conditions due to varying degrees of charring, which are expected to impact the efficacy of conservation methods and post-treatment behavior of the material. Further research is needed to correlate the chemistry of the archaeological material with its physical properties for practical conservation purposes.
Article
Forestry
Xinyou Liu, Xinwei Tu, Wanrong Ma, Changjun Zhang, Houyi Huang, Anca Maria Varodi
Summary: This study investigated preservation methods for the ancient Chinese wooden shipwreck Huaguangjiao I. The results showed that PEG-4000 was an efficient consolidation material and vacuum-freeze and supercritical CO2 drying were effective methods for treating waterlogged wood. The method described in this study can effectively improve the dimensional stability of waterlogged wood.
Article
Nanoscience & Nanotechnology
Jingwen Zhang, Ying Li, Dingfang Ke, Chenya Wang, Huimin Pan, Kefan Chen, Hui Zhang
Summary: In this study, modified lignin nanoparticles (LNPs) were proposed as conservation materials for waterlogged archaeological wood for the first time. The consolidation effect of these modified LNPs was significantly improved compared to conventional LNPs, as demonstrated by the measurement of physical properties, dimensional stability, and mechanical properties. This research provides a new approach for using biomaterials as consolidants for archaeological waterlogged wood and expands the application of lignin in this field.
ACS APPLIED NANO MATERIALS
(2023)
Article
Forestry
Carmen-Mihaela Popescu, Magdalena Broda
Summary: This study aimed to characterize the chemical interactions between waterlogged archaeological wood and organosilicon compounds for conservation, showing that alkoxysilanes have stronger interactions with wood compared to siloxane, suggesting different mechanisms for wood stabilization. Through analyzing the structural changes and reactivity of the applied chemicals, it was found that alkoxysilanes bulk the cell wall and modify wood chemistry, while siloxane fills the cell lumina in the stabilization of waterlogged wood.
Article
Forestry
Liuyang Han, Dehao Yu, Tiantian Liu, Xiangna Han, Guanglan Xi, Hong Guo
Summary: Hygroscopicity is an important property of wood and affects its dimensional stability. This study investigates the effects of sample size on the hygroscopicity of waterlogged archaeological wood. The results show that the hygroscopicity increases as sample size decreases, but the effect is smaller for waterlogged archaeological wood compared to recent wood.
Article
Environmental Sciences
Paloma Furlan, Michael Pfister, Jorge Matos, Conceicao Amado, Anton J. Schleiss
Summary: This study experimentally evaluated the blockage probability of large wood on hydraulic structures, identifying key parameters such as stem length, stem draft, and water level height that influence blockage probability. A logistic regression model was provided to estimate the probability of large wood blockage at hydraulic structures.
WATER RESOURCES RESEARCH
(2021)