Benoit Laignel's research while affiliated with Université de Caen Normandie and other places

Publications (70)

Article
Full-text available
Coastal regions (including estuaries and deltas) are very complex environments with diverse hydrodynamic and bio-geomorphological contexts and with important socio-economic and ecological problems. These systems are among the most affected by human impact through urbanization and port activities, industrial and tourism activities. They are directly...
Article
Full-text available
Past primary productivity is tracked in lake sediments to reconstruct environmental changes. However, the resolution of the routinely used destructive techniques is not suitable for the analysis of a large number of samples due to cost. Non-destructive analysis of chlorophyll-a performed by hyperspectral imagery enables the quick determination of i...
Article
Full-text available
This article aims to investigate the 3D morpho-sedimentary dynamics of two gravel beaches in relation to hydrodynamic forcing, using a multi-sensor approach. Study sites, namely Etretat and Hautot-sur-Mer, are both located in Normandy, France. Thus, they face similar wave conditions of the English channel's eastern side, with megatidal ranges and c...
Article
The comprehension of a process variability mode and its causing factors may help to make a preventive and conservative decision. This work aims to develop a spatial regionalization of water erosion dynamics and identify key factors that control their variability in semi-arid Tunisia. The study is based on a combined approach of multivariate statist...
Article
Full-text available
This research was carried out in the framework of the Surface Water and Ocean Topography (SWOT) program of the French National Centre of Space Studies (CNES). In the context of global climate change, increases in frequency and intensity of extreme events are considered potential threats. Hence, many efforts have been devoted to acquiring a better u...
Presentation
Full-text available
Determining the size and shape of coarse sediment is of paramount importance to many applications (e.g. sediment transport, flow resistance in numerical hydraulic models, estimation of current velocity and direction, habitat classification). One of the current challenges is that to reach statistical significance, one needs to collect large amounts...
Article
Full-text available
Excessive sediment discharge in karstic regions can be highly disruptive to water treatment plants. It is essential for catchment stakeholders and drinking water suppliers to limit the impact of high sediment loads on potable water supply, but their strategic choices must be based on simulations integrating surface and groundwater transfers and tak...
Article
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In this paper, we investigate the effects of the bathymetry of the floodplain distributaries using a 2-dimensional hydrodynamic model of the Wax Lake Outlet (WLO), delta and floodplain (Louisiana, USA), using Delft3D. Modelling the tidal-fluvial interaction of this region is challenging because of its complex network of low-lying floodplain distrib...
Article
Full-text available
Understanding how water resources vary in response to climate at different temporal and spatial scales is crucial to inform long-term management. Climate change impacts and induced trends may indeed be substantially modulated by low-frequency (multi-year) variations, whose strength varies in time and space, with large consequences for risk forecast...
Article
While soil erosion and runoff physical processes and socio-environmental impacts are widely addressed in the literature, few studies have focused on the economical dimension. However, it is essential to consider this dimension to conduct appropriate land use management policies. Erosion and runoff are known to result into on-site and off-site impac...
Article
Intertidal flats are very dynamic environments pressured by anthropogenic activities and climate change. There is an increasing need for updated intertidal topography maps for scientific and coastal management purposes. The future wide-swath altimetry mission SWOT (Surface Water and Ocean Topography) will provide valuable data for intertidal topogr...
Article
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Les départements de Seine-Maritime et de l’Eure sont très sensibles aux ruissellements. Des investissements ont été réalisés ces dernières années pour réduire les risques associés à ces processus. Pourtant l’efficacité de cette politique publique n’a pas été évaluée. À l’échelle d’un bassin pilote (la Lézarde, 212 km²), cette étude originale combin...
Preprint
Full-text available
Understanding how water resources vary at different temporal and spatial scales in response to climate is crucial to inform long-term management. Climate change impacts and induced trends may indeed be substantially modulated by low-frequency (multi-year) variations, whose strength varies in time and space, with large consequences on risk forecasti...
Article
Full-text available
Coastal systems are extremely dynamic environments exposed to many hazards, making accurate and regular monitoring a major challenge, particularly in the context of global change and sea level rise. In this frame of reference, high-frequency, high-resolution coastal Video Monitoring Systems (VMS) have been installed on three megatidal (tidal amplit...
Preprint
Full-text available
While soil erosion and runoff physical aspects are widely addressed in the literature, few studies have focused on the economical dimension. However, it is essential to consider this dimension to conduct appropriate land use management policies. Erosion and runoff are known to result into on-site and off-site impacts. A fully exhaustive analysis of...
Article
Full-text available
This research examines the nonstationary dynamics of extreme surges along the English Channel coasts and seeks to make their connection to the climate patterns at different timescales by the use of a detailed spectral analysis in order to gain insights into the physical mechanisms relating the global atmospheric circulation to the local-scale varia...
Preprint
Full-text available
Excessive sediment discharge at karstic springs and thus, water treatment plants, can be highly disruptive. It is essential for catchment stakeholders and drinking water supplier to reduce the impact of sediment on potable water supply, but their strategic choices must be based on simulations, integrating surface and groundwater transfers, and taki...
Article
Full-text available
In a context of climate, environmental, ecological and socio-economical changes, understanding and predicting the response of hydrological systems on regional to global spatial scales, and on infra-seasonal to multidecadal time-scales, are major topics that must be considered to tackle the challenge of water resource management sustainability. In t...
Preprint
Full-text available
Abstract. This research examines the nonstationary dynamics of extreme surges along the English Channel coasts and seeks to make their connection to the climate patterns at different time-scales by the use of a detailed spectral analysis in order to gain insights on the physical mechanisms relating the global atmospheric circulation to the local-sc...
Conference Paper
Full-text available
Sediment Discharge (SD) at karstic springs refers to a black-box due to the non-linearity of the processes generating SD, and the lack of accurate physical description of karstic environments. Recent research in hydrology emphasized the use of data-driven techniques for black-box models, such as Deep Learning (DL), considering their good predictive...
Article
Intertidal flats lying as a buffer zone between land and sea provide critical services including protection against storm surges and coastal flooding. These environments are characterized by a continuous redistribution of sediment and changes in topography. Sea level rise, anthropogenic pressures, and their related stressors have a considerable imp...
Article
Full-text available
This work examines the multiscale variability in sea level along the English Channel coasts (NW France) using a wavelet multiresolution decomposition of water level values and climate oscillations in order to gain insights in the connection between the global atmospheric circulation and the local-scale variability of the monthly extreme surges. Cha...
Article
In this study, the analytical data set of 26 groundwater samples from the alluvial aquifer of Boumerzoug-El khroub valley has been processed simultaneously with Multivariate analysis, geostatistical modeling, WQI, and geochemical modeling. Cluster analysis identified three main water types based on the major ion contents, where mineralization incre...
Article
Full-text available
Coastal environment with high interaction between nature and societies is subject to multi-hazard interaction such as landslides, flood or cliff retreat. These territories are characterized by numerous elements at risk located in valley bottoms, front sea or at the outlets of small dry watershed. The aim is to quantify the potential consequences of...
Article
Full-text available
With high anthropogenic pressure and the effects of climate change (e.g., sea level rise) on coastal regions, there is a greater need for accurate and up-to-date information about the topography of these systems. Reliable topography and bathymetry information are fundamental parameters for modelling the morpho-hydrodynamics of coastal areas, for fl...
Article
In risk analyses, two components are taken into account: (1) hazard analysis, including susceptibility and temporal occurrence, and (2) consequence analysis, including characterization of elements at risk (EaRs) and their vulnerability. This study focused on characterization of EaRs, in which items are spatially displayed and impacted by natural ev...
Article
Full-text available
The Indian and French Space Agencies, ISRO and CNES, have conceptualized a space-borne Thermal Infrared Reflectance (TIR) mission, TRISHNA (Thermal infRared Imaging Satellite for High-resolution Natural Resource Assessment). The primary design drivers of TRISHNA are the monitoring of (i) terrestrial water stress and use, and of (ii) coastal and con...
Article
The present study aims to estimate the annual soil loss in the Soummam watershed in the northeast of Algeria, using the Revised Universal Soil Loss Equation (RUSLE), geographic information system (GIS), and remote sensing (RS). RUSLE model has been used for modelling the main factors involved in erosive phenomena. The Soummam watershed covers a sur...
Presentation
Full-text available
Coastal environment with high interaction between nature and societies (land-sea interface) are subject to multi-hazards interaction such as landslides, flood or cliff retreat. These territories are characterized by numerous Element at Risk (EaR) located in valley bottoms, front sea, at the outlets of small dry-watershed or on landslide areas. The...
Conference Paper
Full-text available
Coastal environment with high interaction between nature and societies (land-sea interface) are subject to multi-hazards interaction such as landslides, flood or cliff retreat. These territories are characterized by numerous Element at Risk (EaR) located in valley bottoms, front sea, at the outlets of small dry-watershed or on landslide areas. The...
Article
Full-text available
In this study, the multi-time-scale variability of the South English Channel (case of the Seine Bay, North France) sea level and its exceptional events have been investigated in relation with the global climate patterns by the use of wavelet multi-resolution decomposition techniques. The analysis has been focused on surges demodulating by an envelo...
Conference Paper
Several studies have shown that hydrological variability results from the action of atmospheric circulation and watershed dynamics. In France, it has been shown that those factors vary spatially thus several spatial classifications of hydrological variables have been established. Precipitation, temperature and discharge classifications offer an inp...
Article
The goal of the Surface Water and Ocean Topography (SWOT) mission, a future wide-swath radar altimeter, is to measure the elevations of ocean and continental water surfaces with unprecedented precision. A simulator of SWOT high-rate (HR) interferometric SAR images has been developed to provide SWOT-like data to scientists and as a tool to develop a...
Conference Paper
Cette étude est une première approche visant à évaluer les variations spatiales de la qualité des eaux souterraines de la vallée de Boumerzoug-El Khroub (Nord-est de l'Algérie). Dans le souci de mieux comprendre et gérer la qualité des eaux, l'analyse multi-variée, la modélisation géostatistique, l'indice de qualité des eaux, et la modélisation géo...
Book
The monitoring of the water cycle at the Earth surface which tightly interacts with the climate change processes as well as a number of practical applications (agriculture, soil and water quality assessment, irrigation and water resource management, etc.) requires surface temperature measurements at local scale. Such is the goal of the Indian-Frenc...
Article
Full-text available
L’hydrochimie des eaux souterraines du bassin versant de Boumerzoug a été utilisée pour la caractérisation de la variation de leur qualité spatio-temporelle. Soixante douze puits ont été pris en considération et répartis entre trois plaines à savoir : la plaine d’El Khroub, de Fesguia, et de Ain Kercha. La géochimie des eaux indique que le faciès C...
Article
The article which was recently published contained errors in Table 1. The values of coefficient of skewness (Cs) and coefficient of kurtosis (Ck) are not in their proper locations. Given in this article is the corrected table. The original article has been corrected.
Article
This study examines spatial and temporal variability of rainfall in Bizerte-Ichkeul Watershed. The basin, located in the extreme north of Tunisia, covers an area of 3084 km2. Thirteen rainfall stations, with continuous monthly precipitation records over the period (1970–2011), were considered in the analysis. Two methods were used. In the first, th...
Article
Full-text available
Lacustrine sediments contain a wide range of proxies that enable paleoenvironmental reconstructions. For instance, charcoal can be used to document past fire regime changes. In order to analyse high-temporal- and spatial-resolution records, however, it is necessary to develop fast, low-cost and high-stratigraphic-resolution methods. We developed a...
Article
Full-text available
Radar altimetry was initially designed to measure the marine geoid. Thanks to the improvement in the orbit determination from the meter to the centimeter level, this technique has been providing accurate measurements of the sea surface topography over the open ocean since the launch of Topex/Poseidon in 1992. In spite of a decrease in the performan...
Conference Paper
In the context of climate change and ever growing use of water resources, identifying how the climate and watershed signature in discharge variability changes with the geographic location is of prime importance. This study aims at establishinghow 1968-2008 multiresolution links between 3 local hydrometerological variables (precipitation, temperatur...
Poster
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NOAA 20CRv2 and NOAA 20CRv2c reanalysis represents a quantum leap in climate study analysis by providing a global, century long, gridded observational set with quantified uncertainty. For hydrology, the reanalysis allows studying the different phases of the water cycle. One important aspect of the cycle is how large scale climate field interact wit...
Poster
Full-text available
Geophysical signals oscillate over several time-scales that explain different amount of their overall variability and may be related to different physical processes. Characterizing and understanding such variabilities in hydrologi-cal variations and investigating their determinism is one important issue in a context of climate change, as these vari...
Article
Full-text available
Surface water storage is a key component of the terrestrial hydrological and biogeochemical cycles that also plays a major role in water resources management. In this study, surface water storage (SWS) variations are estimated at monthly time-scale over 15 years (1993–2007) using a hypsographic approach based on the combination of topographic infor...
Article
In the present context of global changes, considerable efforts have been deployed by the hydrological scientific community to improve our understanding of the impacts of climate fluctuations on water resources. Both observational and modeling studies have been extensively employed to characterize hydrological changes and trends, assess the impact o...
Conference Paper
Full-text available
Laminated sediments contained valuable information recorded on a micrometric scale. Information about sediments flux and origins require high-resolution source tracking analysis. Quick and non-destructive, hyperspectral imaging provides contiguous reflectance datasets into 2 dimensions with a spatial resolution of 0.02 mm. Located on the west of th...
Article
Water erosion is the major process responsible for soil loss in Central Tunisia. It represents a main risk of sedimentation which threatens the lifetime of water and soil conservation works in the region, such as hillside reservoirs. This paper focuses on the study of spatial and inter-annual variability of specific sediment yield (SSY) estimated f...
Article
Full-text available
It is interesting to try and classify the spatial data to infer the spatial scales associated with certain characteristics within a group of time series. It is indeed very important for operational practices such as flood management and/or climate change adaptation to not only know the severity of a potential impact but also predict the spatial ext...
Article
Full-text available
The Senegal North littoral aquifer bears considerable groundwater resources that face both natural and anthropogenic constraints due to proximity of the ocean and numerous socio-economic activities in this semi-arid region. The present study aims to understand spatial and seasonal hydrochemistry variability of this groundwater. Chemical data were a...
Conference Paper
Full-text available
Pour caractériser les changements climatiques observés aux échelles régionale et locale, une analyse thermique et pluviométrique est proposée. Cette investigation permet de rendre compte de l'extrême variabilité des pluies. Elle montre aussi le caractère sévère et durable de la sécheresse climatique observée dans ces régions à partir de la fin des...

Citations

... We illustrate our proposed workflow toward the development of a hydrodynamic model of the WLAD system in coastal Louisiana (Figure 1). The WLAD system is a frequently modeled landscape (e.g., Christensen et al., 2020;Hiatt & Passalacqua, 2017;Liang et al., 2015;Olliver & Edmonds, 2021;Shafiei et al., 2021;Xing et al., 2017) and exemplifies many of the complex morphological features our method is designed to tackle: channel widths that span a range of scales  10 1 − 10 3 , dendritic and loopy network structures, substantial amounts of channel-wetland connectivity (Hiatt & Passalacqua, 2015), and leveed or otherwise hydrologically inactive regions adjacent to important flow conduits. While every riverine landscape is ultimately different with unique challenges for designing a model, we think the WLAD application provides a good general example in which to test our methodology. ...
... It has been widely used in land, water conservancy, aerospace, mapping, transportation, meteorology, etc. It has been commonly used in land, water, space, mapping, transportation, meteorology, etc. Artificial intelligence (AI) technology has been integrated into various fields of socioeconomic development, and AI technology makes it possible to automatically identify and capture implicit, disordered, and many data features [2]. As a significant branch of artificial neural network algorithm, Self-organizing Feature Mapping (SOFM) neural network is selforganizing clustering of the target dataset with its internal mutual learning and competition mechanism. ...
... Both land use strategies can also provide interesting effects on biodiversity and ecosystem services (Posthumus et al., 2015) and/or can improve soil resilience and promote sustainable agriculture (Lal, 2014). Public policies leading to the implementation of erosion control measures can be economically viable and efficient (Patault et al., 2020). Even if some simplified cultural techniques may imply negative returns for farmers, they may be eligible for agri-environment payments 370 (Posthumus et al., 2015). ...
... Intertidal topography is likely to benefit from the SWOT mission, to be launched end 2022, the first altimeter to estimate elevation in two swaths owing to the nearnadir SAR interferometry technique (Biancamaria et al. 2016). A recent study analyzes the potential of this technique for generating DEM of intertidal flats based on simulation (Salameh et al. 2021). ...
... Remote sensing and/or discussions with stakeholders or landowners could also help to obtain temporal-spatial evolutions of these crucial model input parameters, thus allowing to predict more reliable estimates of soil erosion and sediment yield during the conventional tillage period. In addition, the comparison of WaTEM/SEDEM outputs with those of other spatiallydistributed soil erosion models, such as the expert-based WaterSed model (Patault et al., 2020), could be explored. Importantly, this soil erosion model will include a 137 Cs module in the near future, allowing to reconstruct the 137 Cs spatial distribution in a retro-modelling exercise. ...
... On the one hand, the loose accumulation of loess is more prone to natural disasters, such as slope instability, landslide, collapse, and debris flow while under the influence of natural factors and human activities [5,6]. Moreover, loess is vulnerable to erosion [7], and the formation of a large number of gullies provides a prerequisite for the occurrence of secondary disasters [8][9][10][11]. In addition, due to the loess's unique structure, the loess area's geological environment is extremely fragile; thus, engineering problems such as foundation settlement and tunnel collapse are often encountered [12][13][14]. Therefore, it is vital to improve the properties of loess so that it can better meet engineering requirements. ...
... Both land use strategies can also provide interesting effects on biodiversity and ecosystem services (Posthumus et al., 2015) and/or can improve soil resilience and promote sustainable agriculture (Lal, 2014). Public policies leading to the implementation of erosion control measures can be economically viable and efficient (Patault et al., 2021b). Even if some simplified cultural techniques may imply negative returns for farmers, they may be eligible for agri-environment payments (Posthumus et al., 2015). ...
... CNNs have already been successfully applied to predict the water level and water quality indicators in the Nakdong river basin (Baek et al. 2020), to predict the daily rainfall-runoff at two monitoring stations in Chau Doc and Can Tho ( Van et al. 2020), for flood forecast in the Xixian basin (Chen et al. 2021), and to reproduce beach morphology from coastal video monitoring systems in France (Soloy et al. 2021). However, applications of CNN to assess morphodynamic evolution are still rare and mainly focused on sediment load modelling (Nagy et al. 2002;Gupta et al. 2021). ...
... The temporal nonstationarity of RSLC results from a combination of a long-term trend in the mean RSL, the deterministic tidal component, surge seasonality, and interactions between the tide and surge (Dixon and Tawn, 1999). Many studies also suggest that RSL may have multi-scale oscillatory components from interannual to interdecadal timescales (Karamperidou et al., 2013;Scafetta, 2014;Turki et al., 2020). Hourly to daily extreme RSL related to transient storms, eddies, and tsunamis; seasonal to interannual sea-level dynamics associated with large-scale climate teleconnections and ocean dynamics are considered vital threats to coastal communities, especially, the low-lying areas and sensitive ecosystem areas (Goddard et al., 2015;Lovelock et al., 2017). ...
... The goal of this approach was to parameterize an erosion model, that considers soil surface and land use characteristics, to provide a dynamic indication of the catchments' erosion sensitivity in response to a storm rainfall event. Therefore, we chose the raster-based, spatially distributed, and event-based WaterSed model (Patault et al. 2020;Grangeon et al. 2021). It was developed to model the spatial distribution of runoff and erosion from field to catchment scale. ...