References of "Demoulin, Alain"
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See detailThe picturesque Ardennian valleys: Plio-Quaternary incision of the drainage system in the uplifting Ardenne
Rixhon, Gilles; Demoulin, Alain ULiege

in Demoulin, Alain (Ed.) Landscapes and landforms of Belgium and Luxembourg (2018)

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See detailThe periglacial ramparted depressions of the Hautes Fagnes Plateau: traces of Late Weichselian lithalsas
Demoulin, Alain ULiege; Houbrechts, Geoffrey ULiege; Juvigné, Etienne ULiege

in Demoulin, Alain (Ed.) Landscapes and landforms of Belgium and Luxembourg (2018)

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See detailA unique boulder-bed reach of the Amblève River, Ardenne, at Fonds de Quarreux: Modes of boulder transport
Houbrechts, Geoffrey ULiege; Petit, François ULiege; Van Campenhout, Jean ULiege et al

in Demoulin, Alain (Ed.) Landscapes and landforms of Belgium and Luxembourg (2018)

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See detailErosion surfaces in the Ardenne-Oesling and their associated kaolinic weathering mantle
Demoulin, Alain ULiege; Barbier, F.; Deconinck, A. et al

in Landscapes and landforms of Belgium and Luxembourg (2018)

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See detailThe climate of Belgium and Luxembourg
Erpicum, Michel ULiege; Nouri, Meryem ULiege; Demoulin, Alain ULiege

in Demoulin, Alain (Ed.) Landscapes and landforms of Belgium and Luxembourg (2018)

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See detailMorphogenic setting and diversity of processes and landforms: The geomorphological regions of Belgium
Demoulin, Alain ULiege

in Demoulin, Alain (Ed.) Landscapes and landforms of Belgium and Luxembourg (2018)

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See detailLandscapes and landforms of Belgium and Luxembourg
Demoulin, Alain ULiege

Book published by Springer (2018)

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See detailConstraints on Landslide-Climate Research Imposed by the Reality of Fieldwork in Central Africa
Monsieurs, Elise ULiege; Kirschbaum, Dalia B.; Thiery, Wim et al

in Association of Environmental and Engineering Geologists (CC BY-NC 4.0) (2017, June 05)

Climate change is reported to be ‘very likely’ associated with an increasing trend in extreme rainfall intensity over the tropics. Its impact on the timing of landslide initiation however remains poorly ... [more ▼]

Climate change is reported to be ‘very likely’ associated with an increasing trend in extreme rainfall intensity over the tropics. Its impact on the timing of landslide initiation however remains poorly understood. Central Africa, located in the tropics, has repeatedly been highlighted as lacking landslide catalogs and landslide-climate studies. We present a research approach, adapted to the data-poor context of Central Africa, to study regional rainfall controls on landslides conditioned by climate change. Preliminary results are presented, including a description of the current rain gauge network installed, an inventory of 83 landslide events with known date and location, and a case study of a landslide occurrence. We show that the underrepresentation of Central Africa in current landslide-climate research is related to the dearth of adequate rainfall ground monitoring networks and spatiotemporal data on landslide occurrence, rather than to the lack of landslide occurrence. Research constraints imposed by the context of Central Africa are highlighted. In presenting this challenging research setting, our aim is not to discourage research in the region, but to identify lessons learned from previous field work and emphasize the abundant opportunities inviting natural hazard studies in Central Africa. [less ▲]

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See detailFluvial archives, a valuable record of vertical crustal deformation
Demoulin, Alain ULiege; Mather, Anne; Whittaker, Alexander

in Quaternary Science Reviews (2017)

The study of drainage network response to uplift is important not only for understanding river system dynamics and associated channel properties and fluvial landforms, but also for identifying the nature ... [more ▼]

The study of drainage network response to uplift is important not only for understanding river system dynamics and associated channel properties and fluvial landforms, but also for identifying the nature of crustal deformation and its history. In recent decades, geomorphic analysis of rivers has proved powerful in elucidating the tectonic evolution of actively uplifting and eroding orogens. Here, we review the main recent developments that have improved and expanded qualitative and quantitative information about vertical tectonic motions (the effects of horizontal deformation are not addressed). Channel long profiles have received considerable attention in the literature, and we briefly introduce basic aspects of the behaviour of bedrock rivers from field and numerical modelling perspectives, before describing the various metrics that have been proposed to identify the information on crustal deformation contained within their steady-state characteristics. Then, we review the literature dealing with the transient response of rivers to tectonic perturbation, through the production of knickpoints propagating through the drainage network. Inverse modelling of river profiles for uplift in time and space is also shown to be very effective in reconstructing regional tectonic histories. Finally, we present a synthetic morphometric approach for deducing the tectonic record of fluvial landscapes. As well as the erosional imprint of tectonic forcing, sedimentary deposits, such as fluvial terrace staircases, are also considered as a classical component of tectonic geomorphology. We show that these studies have recently benefited from rapid advances in dating techniques, allowing more reliable reconstruction of incision histories and estimation of incision rates. The combination of progress in the understanding of transient river profiles and larger, more rigorous data sets of terrace ages has led to improved understanding of river erosion and the implications for terrace profile correlation, i.e., extrapolation of local data to entire profiles. Finally, planform changes in fluvial systems are considered at the channel scale in alluvial rivers and regional level in terms of drainage reorganisation. Examples are given of how numerical modelling can efficiently combine with topographic data to shed new light on the (dis)equilibrium state of drainage systems across regional drainage divides. [less ▲]

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See detailCharacteristics and frequency of large submarine landslides at the western tip of the Gulf of Corinth
Beckers, Arnaud; Hubert, Aurelia ULiege; Beck, Christian et al

in Geophysical Research Abstracts (2016), 18

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See detailA first database for landslide studies in densely urbanized areas of the intertropical zone: Abidjan, Côte d’Ivoire
Gnagne, Lorng Frédéric ULiege; Demoulin, Alain ULiege; Biemi, Jean et al

in Geophysical Research Abstracts (2016), 18

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See detailGeomorphometric mapping of spatio-temporal changes in Plio-Quaternary uplift in the NW European Alpine foreland
Demoulin, Alain ULiege; Bourdon, Hadrien

in Geophysical Research Abstracts (2016), 18

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See detailA new numerical framework for simulating the control of weather and climate on the evolution of soil-mantled hillslopes
Bovy, Benoît ULiege; Braun, Jean; Demoulin, Alain ULiege

in Geomorphology (2016), 263

We present a new numerical framework for simulating short to long-term hillslope evolution. This modeling framework, to which we have given the name CLICHE (CLImate Control on Hillslope Evolution), aims ... [more ▼]

We present a new numerical framework for simulating short to long-term hillslope evolution. This modeling framework, to which we have given the name CLICHE (CLImate Control on Hillslope Evolution), aims to better capture the control of climate on soil dynamics. It allows the use of realistic forcing that involves, through a specific time discretization scheme, the variability of both the temperature and precipitation at time scales ranging from the daily rainfall events to the climatic oscillations of the Quaternary, also including seasonal variability. Two simple models of soil temperature and soil water balance permit the link between the climatic inputs and derived quantities that take part in the computation of the soil flux, such as the surface water discharge and the depth of the non-frozen soil layer. Using this framework together with a multi-process parameterization of soil transport, we apply an original method to calculate hillslope effective diffusivity as a function of climate. This allows us to demonstrate the ability of the model to simulate observed rates of hillslope erosion under different climates (cold and temperate) with a single set of parameter values. Numerical experiments furthermore suggest a potential high peak of sediment transport on hillslopes during the glacialinterglacial transitions of the Quaternary. We finally discuss the need to improve the parameterization of the soil production and transport processes in order to explicitly account for other key controlling factors that are also climate-sensitive, such as biological activity. [less ▲]

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See detailSoil production and hillslope transport in mid-latitudes during the last glacial-interglacial cycle: A combined data and modelling approach in northern Ardennes
Bovy, Benoît ULiege; Braun, Jean; Demoulin, Alain ULiege

Conference (2015, October)

The relative efficiency of various hillslope processes through Quaternary glacial-interglacial cycles in the mid-latitudes is not well constrained. Based on a unique set of topographic and soil thickness ... [more ▼]

The relative efficiency of various hillslope processes through Quaternary glacial-interglacial cycles in the mid-latitudes is not well constrained. Based on a unique set of topographic and soil thickness data in the Ardennes (Belgium), we combine the new CLICHE model of climate-dependent hillslope evolution with an inversion algorithm in order to get deeper insight into the ways and timing of hillslope dynamics under one such climatic cycle. We simulate the evolution of a synthetic hill reproducing the terrain attribute distributions of the hillslopes of a ~2500 km2 real area under a simple two-stage 120-kyr-long climatic scenario with linear transitions. The inversion method samples a misfit function in the model parameter space, based on estimates of the fit of topographic derivative distributions in classes of soil thickness and of the relative frequencies of the predicted soil thickness classes. Though the inversion results show convergence patterns for several parameters, no unique solution emerges. We obtain five clusters of good fits, whose centroids are taken as acceptable model solutions. Based on the predicted time series of average denudation rate and soil thickness, plus snapshots of the soil distribution at characteristic times, we compare these solutions with independent data not involved in the misfit function and identify the most realistic one. Providing first-order estimates of several parameters that compare well with published data, it shows that denudation rates increase dramatically at both warm-cold and cold-warm transitions when the mean annual temperature passes through the [0, -5°C] range. It also underlines the overwhelming importance of gelifluction in transporting soil and shaping hillslopes. [less ▲]

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See detailDes terrasses de fond de vallée de la Meuse dans la région de Huy (Belgique)
Juvigné, Etienne ULiege; Demoulin, Alain ULiege; Houbrechts, Geoffrey ULiege et al

in BSGLg (2015), 65

Des alluvions mosanes mises au jour dans quatre chantiers de la ville d’Andenne et d’autres fossilisées dans le méandre abandonné de Leumont (Huy) sont mises en relation avec d’autres terrasses mosanes ... [more ▼]

Des alluvions mosanes mises au jour dans quatre chantiers de la ville d’Andenne et d’autres fossilisées dans le méandre abandonné de Leumont (Huy) sont mises en relation avec d’autres terrasses mosanes signalées antérieurement dans des travaux géotechniques réalisés entre Andenne et Hermalle-sous-Huy. Enfoui sous des dépôts atteignant localement 30 m d’épaisseur, le dernier cailloutis du méandre recoupé de Leumont se raccorde parfaitement à la plaine alluviale actuelle à sa sortie, et est en fait une section abandonnée de cette dernière. À l’entrée du méandre, il se situe toutefois 1,5 à 2 m au-dessus du cailloutis de la plaine alluviale actuelle, ce pour quoi nous l’appelons Terrasse (T.) locale de Wanze 2. Dans ce même méandre, il existe un autre cailloutis mosan qui se situe, de base à base, 6 m plus haut que le niveau précité et est lui-même fossilisé sous une vingtaine de mètres dépôts ; nous l’avons nommé T. de Wanze 1. Les âges respectifs du recoupement du méandre et de la T. de Wanze 1 ont été estimés de façon indirecte, suggérant qu’à Huy, (1) la plaine alluviale est à son niveau actuel depuis le début de la dernière glaciation, et (2) la Meuse a été active sur la T. de Wanze 1 pendant l’avant-dernière glaciation (Stade Isotopique Marin 6). Des taux d’incision de la Meuse et de la surrection régionale qui l’a occasionnée sont estimés à partir de la T. de Wanze 1 et d’une terrasse plus élevée présente à Naxhelet, juste à l’ouest du méandre de Leumont. Ils suggèrent une vitesse constante de ~0,06 mm/a pour la surrection de la région de Huy depuis ~600 ka. [less ▲]

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See detailControls on knickpoint migration in a drainage network of the moderately uplifted Ardennes Plateau, Western Europe
Beckers, Arnaud ULiege; Bovy, Benoît ULiege; Hallot, Eric ULiege et al

in Earth Surface Processes & Landforms (2015), 40

Much research has been devoted to the development of numerical models of river incision. In settings where bedrock channel erosion prevails, numerous studies have used field data to calibrate the widely ... [more ▼]

Much research has been devoted to the development of numerical models of river incision. In settings where bedrock channel erosion prevails, numerous studies have used field data to calibrate the widely acknowledged stream power model of incision and to discuss the impact of variables that do not appear explicitly in the model’s simplest form. However, most studies have been conducted in areas of active tectonics, displaying a clear geomorphic response to the tectonic signal. Here, we analyze the traces left in the drainage network 0.7 My after the Ardennes region (western Europe) underwent a moderate 100–150 m uplift. We identify a set of knickpoints that have traveled far upstream in the Ourthe catchment, following this tectonic perturbation. Using a misfit function based on time residuals, our best fit of the stream power model parameters yields m= 0.75 and K = 4.63 × 10-8 m-0.5y-1. Linear regression of the model time residuals against quantitative expressions of bedrock resistance to erosion shows that this variable does not correlate significantly with the residuals. By contrast, proxies for position in the drainage system prove to be able to explain 76% of the residual variance. High time residuals correlate with knickpoint position in small tributaries located in the downstream part of the Ourthe catchment,where some threshold was reached very early in the catchment’s incision history. Removing the knickpoints stopped at such thresholds from the data set, we calculate an improved m= 0.68 and derive a scaling exponent of channel width against drainage area of 0.32, consistent with the average value compiled by Lague for steady state incising bedrock rivers. [less ▲]

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See detailPatterns of Quaternary uplift of the Corinth rift southern border (N Peloponnese, Greece) revealed by fluvial landscape morphometry
Demoulin, Alain ULiege; Beckers, Arnaud ULiege; Hubert, Aurelia ULiege

in Geomorphology (2015), 246

The Rift of Corinth is a world-class example of young active rifting and, as such, is an ideal natural laboratory of continental extension. However, though much investigated for two decades, several ... [more ▼]

The Rift of Corinth is a world-class example of young active rifting and, as such, is an ideal natural laboratory of continental extension. However, though much investigated for two decades, several aspects of the mechanisms at work are still poorly understood. The aim of this paper is a detailed morphometric study of the fluvial landscape response to the tectonic uplift of the rift southern shoulder in order to reconstruct the rift's Quaternary evolution, with special attention to timing, location, and intensity of uplift episodes. Based on the use of a large set of catchment and long profile metrics complemented by the newR/SR integrative approach of the regional drainage network, we identified three distinct episodes of uplift of the northern Peloponnese coastal tract, of which the intermediate one, dated around 0.35–0.4 Ma, is only recorded in the topography of the central part of the rift shoulder, and the youngest one appears to have propagated from east to west over the last 10–20 ka. While net uplift remained minimum in the eastern part of the study area during the whole Quaternary, it shows a clear maximumin the central part of the rift shoulder since 0.4 Ma and an eastward shift of this maximumin recent times. Maximum uplift rates calculated from the morphometric data are of N1.05 and 2–5 mmyear−1 for, the mid-Middle Pleistocene and Holocene uplift episodes, respectively. The morphometric evidence reveals an onshore uplift history remarkably consistent with the rift evolution reconstructed from other data sets. In the long term, it shows a stable pattern of maximum activity in the central part of the rift, confirming previous conclusions about the absence of rift propagation. In the short term, it sheds light on a possible E–Wmigration of the zone of recent uplift, suggesting that in the near future fault activity and seismic hazard might concentrate in the Heliki–Aegion area, at the western tip of this uplift wave. [less ▲]

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