Coraline Wyard

Institut Scientifique de Service Public | ISSEP · Remote sensing and geodata

With climate change, heat waves are projected to become more frequent and more intense in the near future in Belgium. These heat events negatively impact the population physical and mental health. This leads to an increase in mortality and morbidity rates. Although urban communities are more exposed due to the urban heat island (UHI) effect, both r...

This poster shows how the combined expertise of research centres and local actors can help territories to define priority areas for action where heat extremes are greatest and where vulnerable populations reside. It presents the results of an operational project, the Canopy Plan of Liège, which was developed by combining the expertise of ISSeP, UCL...

This dataset contains a collection of 1601 image tiles of 64x64 pixels (3.2x3.2m²) annotated for 12 roofing materials. These tiles were extracted from 5 cm RGB orthophotos acquired by the city of Namur (Belgium) in 2017. The additional data used to create this dataset are (a) a Namur roof section mask, and (b) a set of 1601 material samples acquire...

Japanese knotweed (Fallopia japonica) is a species of fast growing herbaceous perennial plant considered as an invasive alien species in many European countries. The rapid proliferation of this plant, by rhizomes, is strongly accelerated by human activities and climatic events, such as the July 2021 floods that occurred in Wallonia, southern Belgiu...

Given their potential for the development of greening strategies, solar energy production or as sources of pollutants, roofs are increasingly the focus of local authorities. This study aims at producing operational roof material maps through a 12-roof material classification based on a deep learning approach applied on 5-cm orthophotos acquired ove...

Due to climate change, the intensity and frequency of heat waves is projected to increase in the near future. During these events, citizens might experience thermal stress, which negatively impacts their health, ultimately leading to an increase in mortality and morbidity rates. Although urban population is at a higher risk due to the heat island e...

The exploitation of urban-material spectral properties is of increasing importance for a broad range of applications, such as urban climate-change modeling and mitigation or spe-cific/dangerous roof-material detection and inventory. A new spectral library dedicated to the detection of roof material was created to reflect the regional diversity of m...

L'étude cartographique des dynamiques d'occupation et d'utilisation des sols est une source d'information essentielle pour la surveillance de l'environnement et l'élaboration de stratégies de planification pour un territoire plus résilient. Pour cela, l'observation de la Terre (OT) multi-échelle, qu'elle soit satellitaire, aéroportée ou par drone,...

D.2 Sustainable Development : « D2.01 Resilient cities" In a context where the dynamic trend of urbanization is becoming more and more rapid, urban planning is a challenge as it involves limiting the amount of land being taken up while providing new living spaces. It is therefore important for local authorities to undertake effective measures in ur...

The ability of unmanned aerial vehicles (UAVs) to acquire data in a non-intrusive way is a definite advantage for the development of decision support tools for the monitoring of complex sites. For this purpose, active landfills, due to the continuous ground operations, such as earthmoving and depositing of miscellaneous waste with heavy machinery,...

The ability of unmanned aerial vehicles (UAVs) to acquire data in a non-intrusive way is a definite advantage for the development of decision support tools for the monitoring of complex sites. For this purpose, active landfills, due to the continuous ground operations, such as earthmoving and depositing of miscellaneous waste with heavy machinery,...

The alteration of roof materials can be a potential source of pollution with negative effects on the environment and on human health. For instance, analyses of runoff water revealed high levels of metal traces but also polycyclic aromatic hydrocarbons and phthalates. Similarly, the alteration or combustion of asbestos contained in certain types of...

As a place to live, work and play, urban spaces are the nerve centers of human activity. The urban spaces, which are becoming increasingly extensive and dense, are particularly sensitive to the effects of climate change. Greening cities has been identified as one of the most effective ways to mitigate one of these effects, the urban heat island. In...

Earth observation technologies offer non-intrusive solutions for monitoring complex and risky sites, such as landfills. In particular, unmanned aerial vehicles (UAVs) offer the ability to acquire data at very high spatial resolution, with full control of the temporality required for the desired application. The versatility of UAVs, both in terms of...

Urban planning is a challenge, especially when it comes to limiting land take. In former industrial regions such as Wallonia, the presence of a large number of brownfields, here called "re-development sites", opens up new opportunities for sustainable urban planning through their re-valorization. The Walloon authorities are currently managing an in...

Sub-daily precipitation extremes are high-impact events that can result in flash floods, sewer system overload, or landslides. Several studies have reported an intensification of projected short-duration extreme rainfall in a warmer future climate. Traditionally, regional climate models (RCMs) are run at a coarse resolution using deep-convection pa...

The Walloon Region is currently managing a database of more than 2000 'redevelopment sites', i.e. urban sites that were previously used for industrial activities and/or housing and that are now abandoned. The administration needs to keep this inventory up-to-date so that the necessary urban planning could be done; however, at the moment, this infor...

Landfill managers are subject to obligations which include the regular monitoring of the topographical and land cover (LC) evolution of the site. This research aims at developing a cost-effective non-intrusive methodology for mapping landfill LC features. To this end, a state-of-the-art OBIA open-source workflow based on an integration of GRASS GIS...

The Walloon Region is managing an inventory of abandoned sites, called “Redevelopment sites” (RDS). These sites are former industrial, commercial, social, real estate (housing excluded) areas whose current condition is against the good management of the site or represents a deconstruction of the urban canvas. Fully updating the inventory of more th...

Roof materials can be a significant source of pollution for the environment and can have negative health effects. Analyses of runoff water revealed high levels of metal traces but also polycyclic aromatic hydrocarbons and phthalates. This contamination would result from corrosion and alteration of roof materials. Similarly, the alteration or combus...

In Belgium, most flood events occur in winter as a result of intense precipitation events but also through the abrupt melting of the snowpack that covers the Ardennes summits. These conditions favourable to floods exhibit a decreasing trend over 1959–2010 resulting from the reduction in snow accumulation, although extreme precipitation events show...

Les lacs et retenues d’eau d’Afrique sont primordiaux à la vie dans les régions qu’ils bordent. Le niveau de ces lacs est fortement dépendant des précipitations qui tombent directement à leur surface et dans leur bassin versant. Dans un but de gestion de la ressource en eau, il est important d’analyser et de prévoir l’évolution passée, en temps rée...

La sécurité alimentaire est l’un des enjeux majeurs des pays du Sahel étant donné la pression démographique et la menace que représente la désertification. Cette désertification est entre autre aggravée par une utilisation non-durable des ressources naturelles. La bonne connaissance et la bonne gestion des ressources en eau, des sols et de la végét...

The first aim of this study is to determine if changes in precipitation and more specifically in convective precipitation are projected in a warmer climate over Belgium. The second aim is to evaluate if these changes are dependent on the convective scheme used. For this purpose, the regional climate model Modèle Atmosphérique Régional (MAR) was for...

INSPIRE and PSI directives induced major changes in the Walloon geomatics ecosystem. INSPIRE aims at establishing an infrastructure for spatial information in the European community for environmental policies. PSI is the European legislation on the re-use of public sector information, including all government-held geodatasets. For compliance purpos...

In the context of global warming, growing attention is paid to the evolution of the Greenland ice sheet (GrIS) and its contribution to sea-level rise at the centennial timescale. Atmosphere–GrIS interactions, such as the temperature–elevation and the albedo feedbacks, have the potential to modify the surface energy balance and thus to impact the Gr...

The aim of this study is to assess the sensitivity of convective precipitation modelled by the regional climate model MAR (Modèle Atmosphérique Régional) over 1987–2017 to four newly implemented convective schemes: the Bechtold scheme coming from the MESO-NH regional model and the Betts-Miller-Janjić, Kain-Fritsch and modified Tiedtke schemes comin...

Estimates for the recent period and projections of the Antarctic surface mass balance (SMB) often rely on high-resolution polar-oriented regional climate models (RCMs). However, RCMs require large-scale boundary forcing fields prescribed by reanalyses or general circulation models (GCMs). Since the recent variability of sea surface conditions (SSCs...

In Belgium, the future response of the climate to increasing greenhouse gas concentration is not clear, especially with regard to the perturbations of the precipitation regime, snow cover, and global radiation. On the one hand, existing studies show results which differ strongly either according to the future scenario, or from one model to another....

The use of regional climate models (RCMs) can partly reduce the biases in global radiative flux (Eg↓) that are found in reanalysis products and global models, as they allow for a finer spatial resolution and a finer parametrisation of surface and atmospheric processes. In this study, we assess the ability of the MAR («Modèle Atmosphérique Régional»...

The CORDEX.be project created the foundations for Belgian climate services by producing high-resolution Belgian climate information that (a) incorporates the expertise of the different Belgian climate modeling groups and that (b) is consistent with the outcomes of the international CORDEX (“COordinated Regional Climate Downscaling Experiment”) proj...

In the context of global warming, the projected Greenland sea level rise contribution is mainly controlled by the interactions between the Greenland ice sheet (GrIS) and the atmosphere, in particular through the temperature and surface mass balance – elevation feedback. In order to evaluate the importance of these feedbacks, we used three methods t...

On December 2010, several snow events allowed an exceptional snow cover over Belgium. 27 days with snow cover were observed at Uccle and snow depths of 20, 30 and 70 cm were measured on Christmas 2010 respectively at Uccle, Bierset and Mont Rigi in the Hautes-Fagnes. On December 20, while the entire Belgium was covered by a thick blanket of snow, w...

The Ourthe River, in the south-east of Belgium, has a catchment area of 3500 km 2 and is one of the main tributaries of the Meuse River. In the Ourthe, most of the flood events (FE) occur during winter and about 50% of them are due to heavy rainfall events combined with an abrupt melting of the snowpack covering the Ardennes massif during winter. T...

As a consequence of climate change, several studies concluded that winter flood occurrence could increase in the future in many rivers of northern and western Europe in response to an increase in extreme precipitation events. This study aims to determine if trends in extreme hydroclimatic events generating floods can already be detected over the la...

The Ourthe River (southeast of Belgium) is one of the main tributaries of the Meuse River with a catchment area of 3500 km². About 50 % of the floods which occur in the Ourthe River catchment are due to rainfall events associated with the melting of the snow which covers the Ardennes in winter. In this study, hydroclimatic conditions favourable to...

Abstract – Snow cover evolution during the last fifty years in the Hautes Fagnes (Belgium) using the regional climate MAR model. The " Modèle Atmosphérique Régionale " MAR is a regional climate model originally developed to study the polar ice sheets. In this study, the MAR model has been adapted to Belgium in order to study the snow cover evolutio...

The MAR model is a regional climate model originally developped for the polar regions to study the surface mass balance. In this study, the MAR model has been adapted to Belgium in order to study the snow cover evolution of the Hautes Fagnes (south-east of Belgium), a region covered by snow one to two months per year. As validation, we have sucessf...

During the two last decades, the Greenland ice sheet (GrIS) contribution to the global mean sea level rise has significantly increased. But, difficulties remain to assess GrIS future contribution because of large uncertainties linked to the feedback between the surface mass balance (SMB) and GrIS topography changes. The regional climate MAR model h...