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Dissertation
Séquestration de carbone par une forêt claire au Bénin : Variabilité interannuelle des flux et d'un indice de végétation
Authors: --- --- --- --- --- et al.
Year: 2017 Publisher: Liège Université de Liège (ULiège)

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Forests are playing an important role in climate change mitigation. The carbon budget associated to African ecosystems as well as their reactions to modified climate conditions are poorly documented. This study proposes an estimation of the annual carbon sequestration of an open forest in North-Western Benin (West Africa) and identifies the driving variables causing sequestration capacity’s variability, at three different time scales. This forest is dominated by the woody species Isoberlinia doka and is submitted to a Sudanian climate. The study site is part of the international AMMA-CATCH observation program. CO2 fluxes measurements, collected over a period of six years by an eddy co-variance system, were used in combination with meteorological data and with the MODIS Enhanced Vegetation Index. u* correction was applied to filter stable night-time conditions. The annual carbon sequestration estimate was made by summing the Net Ecosystem Exchange (NEE) provided at half-hourly scale and by filling the gaps resulting from raw data treatment and data capture systems failures. Daytime variations of NEE were first associated with the photosynthetically active photon flux density (PPFD) using a non-linear model, in order to extract the three following parameters: the saturation assimilation (P1500), the dark respiration (Rd) and the quantum light efficiency (α). The seasonal and inter-annual variabilities have then been analysed combining these parameters to environmental factors and to the vegetation index taking in account calculated anomalies. The spatial heterogeneity was also assessed by following spatial divergence of the P1500 and the EVI around the flux tower. On average, the forest acts as a carbon sink of 490 gC m-2 year-1. The seasonal variation of P1500 was strongly correlated to the vegetation index (r² = 0.69) and both saturation assimilation and dark respiration respond to soil moisture increase. The sink strength is strongly dependent on total annual precipitations (p-value = 0.002, r² = 0.97) and is better explained by respiration changes than saturation assimilation variability. More precisely, following behaviours have been clearly detected in our data: wettest years have the smallest annual respiration rates (significant) and the highest saturation assimilation (although non-significant). Interestingly, driest years show the highest respiration rates. Higher saturation assimilations were confirmed by an improved vegetation activity (significant). NEE anomalies could be partially explained by P1500 anomalies that were also confirmed by the vegetation index (p-value < 0.01). Spatial heterogeneity couldn’t be confirmed with EVI data for both seasons. An increasing assimilation before the first rains has also been detected that would also deserve being deeper investigated.


Book
Geo Data Science for Tourism
Authors: ---
Year: 2022 Publisher: Basel MDPI Books

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Abstract

This reprint describes the recent challenges in tourism seen from the point of view of data science. Thanks to the use of the most popular Data Science concepts, you can easily recognise trends and patterns in tourism, detect the impact of tourism on the environment, and predict future trends in tourism. This reprint starts by describing how to analyse data related to the past, then it moves on to detecting behaviours in the present, and, finally, it describes some techniques to predict future trends. By the end of the reprint, you will be able to use data science to help tourism businesses make better use of data and improve their decision making and operations..


Book
Geo Data Science for Tourism
Authors: ---
Year: 2022 Publisher: Basel MDPI Books

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Abstract

This reprint describes the recent challenges in tourism seen from the point of view of data science. Thanks to the use of the most popular Data Science concepts, you can easily recognise trends and patterns in tourism, detect the impact of tourism on the environment, and predict future trends in tourism. This reprint starts by describing how to analyse data related to the past, then it moves on to detecting behaviours in the present, and, finally, it describes some techniques to predict future trends. By the end of the reprint, you will be able to use data science to help tourism businesses make better use of data and improve their decision making and operations..


Book
Geo Data Science for Tourism
Authors: ---
Year: 2022 Publisher: Basel MDPI Books

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Abstract

This reprint describes the recent challenges in tourism seen from the point of view of data science. Thanks to the use of the most popular Data Science concepts, you can easily recognise trends and patterns in tourism, detect the impact of tourism on the environment, and predict future trends in tourism. This reprint starts by describing how to analyse data related to the past, then it moves on to detecting behaviours in the present, and, finally, it describes some techniques to predict future trends. By the end of the reprint, you will be able to use data science to help tourism businesses make better use of data and improve their decision making and operations..

Keywords

Research & information: general --- Geography --- green hotel --- corporate social responsibility --- green hotel certification --- Chinese regional tourism --- socioeconomic and environmental drivers --- spatiotemporal influencing factors --- spatiotemporal estimation mapping --- Bayesian STVC model --- spatiotemporal nonstationary regression --- geographical data modeling analysis --- sports tourism --- spatial distribution --- geographic detector --- influencing factors --- China --- A-level scenic spots --- spatiotemporal evolution --- trend analysis --- Geodetector --- tourism economic vulnerability --- obstacle factors --- trend prediction --- major tourist cities --- tourism flow --- cellular signaling data --- social network analysis --- network connection --- node centrality --- communities --- relatedness between attractions --- online tourism reviews --- heterogeneous information network --- embedding --- attraction image --- topic extraction --- AGNES clustering --- tourist attraction clustering --- tourist attraction reachability space model --- space-time deduction --- tour route searching --- green hotel --- corporate social responsibility --- green hotel certification --- Chinese regional tourism --- socioeconomic and environmental drivers --- spatiotemporal influencing factors --- spatiotemporal estimation mapping --- Bayesian STVC model --- spatiotemporal nonstationary regression --- geographical data modeling analysis --- sports tourism --- spatial distribution --- geographic detector --- influencing factors --- China --- A-level scenic spots --- spatiotemporal evolution --- trend analysis --- Geodetector --- tourism economic vulnerability --- obstacle factors --- trend prediction --- major tourist cities --- tourism flow --- cellular signaling data --- social network analysis --- network connection --- node centrality --- communities --- relatedness between attractions --- online tourism reviews --- heterogeneous information network --- embedding --- attraction image --- topic extraction --- AGNES clustering --- tourist attraction clustering --- tourist attraction reachability space model --- space-time deduction --- tour route searching


Book
Remote Sensing of Land Surface Phenology
Authors: --- --- --- ---
ISBN: 3036553266 3036553258 Year: 2022 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Land surface phenology (LSP) uses remote sensing to monitor seasonal dynamics in vegetated land surfaces and retrieve phenological metrics (transition dates, rate of change, annual integrals, etc.). LSP has developed rapidly in the last few decades. Both regional and global LSP products have been routinely generated and play prominent roles in modeling crop yield, ecological surveillance, identifying invasive species, modeling the terrestrial biosphere, and assessing impacts on urban and natural ecosystems. Recent advances in field and spaceborne sensor technologies, as well as data fusion techniques, have enabled novel LSP retrieval algorithms that refine retrievals at even higher spatiotemporal resolutions, providing new insights into ecosystem dynamics. Meanwhile, rigorous assessment of the uncertainties in LSP retrievals is ongoing, and efforts to reduce these uncertainties represent an active research area. Open source software and hardware are in development, and have greatly facilitated the use of LSP metrics by scientists outside the remote sensing community. This reprint covers the latest developments in sensor technologies, LSP retrieval algorithms and validation strategies, and the use of LSP products in a variety of fields. It aims to summarize the ongoing diverse LSP developments and boost discussions on future research prospects.


Book
Recent Advances in Geographic Information System for Earth Sciences
Author:
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Geographic information systems (GISs) have played a vital role in Earth sciences by providing a powerful means of observing the world and various tools for solving complex problems. The scientific community has used GISs to reveal fascinating details about the Earth and other planets. This book on recent advances in GIS for Earth sciences includes 12 publications from esteemed research groups worldwide. The research and review papers in this book belong to the following broad categories: Earth science informatics (geoinformatics), mining, hydrology, natural hazards, and society.


Book
Recent Advances in Geographic Information System for Earth Sciences
Author:
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Geographic information systems (GISs) have played a vital role in Earth sciences by providing a powerful means of observing the world and various tools for solving complex problems. The scientific community has used GISs to reveal fascinating details about the Earth and other planets. This book on recent advances in GIS for Earth sciences includes 12 publications from esteemed research groups worldwide. The research and review papers in this book belong to the following broad categories: Earth science informatics (geoinformatics), mining, hydrology, natural hazards, and society.


Book
Recent Advances in Geographic Information System for Earth Sciences
Author:
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Geographic information systems (GISs) have played a vital role in Earth sciences by providing a powerful means of observing the world and various tools for solving complex problems. The scientific community has used GISs to reveal fascinating details about the Earth and other planets. This book on recent advances in GIS for Earth sciences includes 12 publications from esteemed research groups worldwide. The research and review papers in this book belong to the following broad categories: Earth science informatics (geoinformatics), mining, hydrology, natural hazards, and society.

Keywords

Research & information: general --- mine safety --- GIS-coupled --- spatiotemporal model --- LBM --- methane gas emission --- traffic flows --- taxi trajectory --- float cars --- spatial community --- transport system --- land use --- multi-functionality --- production-living-ecology function --- spatiotemporal dynamics --- obstacle factors --- Xiangxi --- DEM grid cell size --- efficiency --- mountainous watersheds --- optimized parameter set --- TOPMODEL --- social media --- rainstorm event --- spatiotemporal analysis --- factor assessing --- parallel algorithm --- map overlay analysis --- Hilbert ordering decomposition --- spatial analysis --- GIS vector map data --- GIS vector map security --- selective encryption --- simplification method and cryptography --- geo-sensor framework --- geo-sensor platform (GIS) --- sensor networks --- do-it-yourself (DIY) --- landslide susceptibility mapping --- ensemble techniques --- functional trees --- bagging --- rotation forest --- dagging --- algorithm --- cognition --- computer languages --- eye-tracking measurement --- gaze tracking --- human-computer interaction --- open source software --- symbols --- visualisation --- Geographic information systems --- mine planning --- mine development --- mine operation --- environmental management --- mine reclamation --- Indian Himalayas --- landslides --- GIS --- remote sensing --- mine safety --- GIS-coupled --- spatiotemporal model --- LBM --- methane gas emission --- traffic flows --- taxi trajectory --- float cars --- spatial community --- transport system --- land use --- multi-functionality --- production-living-ecology function --- spatiotemporal dynamics --- obstacle factors --- Xiangxi --- DEM grid cell size --- efficiency --- mountainous watersheds --- optimized parameter set --- TOPMODEL --- social media --- rainstorm event --- spatiotemporal analysis --- factor assessing --- parallel algorithm --- map overlay analysis --- Hilbert ordering decomposition --- spatial analysis --- GIS vector map data --- GIS vector map security --- selective encryption --- simplification method and cryptography --- geo-sensor framework --- geo-sensor platform (GIS) --- sensor networks --- do-it-yourself (DIY) --- landslide susceptibility mapping --- ensemble techniques --- functional trees --- bagging --- rotation forest --- dagging --- algorithm --- cognition --- computer languages --- eye-tracking measurement --- gaze tracking --- human-computer interaction --- open source software --- symbols --- visualisation --- Geographic information systems --- mine planning --- mine development --- mine operation --- environmental management --- mine reclamation --- Indian Himalayas --- landslides --- GIS --- remote sensing


Book
Biomechanics Energetics of Natural Assisted Human Comparative Movement Locomotion
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Movement and locomotion have always been key activities for all animals, being related to the most crucial life functions: retrieving food, facing environmental issues and mating. Humans developed complex upper arms movements and bipedal gaits in order to move and locomote. To enhance their performance, they started inventing smart passive mechanical tools. This need arose from intrinsic limitations of their muscle–joint–bone systems and metabolic power availability. Newly invented devices were mainly introduced in order to cope with such constraints. The aim of this Special Issue is to advance knowledge regarding symmetry, biomechanics and energetics of passively assisted human movement and locomotion.


Book
Transformation thermotics and extended theories : inside and outside metamaterials
Authors: ---
Year: 2023 Publisher: Singapore : Springer Nature Singapore : Imprint: Springer,

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This open access book describes the theory of transformation thermotics and its extended theories for the active control of macroscopic thermal phenomena of artificial systems, which is in sharp contrast to classical thermodynamics comprising the four thermodynamic laws for the passive description of macroscopic thermal phenomena of natural systems. This monograph consists of two parts, i.e., inside and outside metamaterials, and covers the basic concepts and mathematical methods, which are necessary to understand the thermal problems extensively investigated in physics, but also in other disciplines of engineering and materials. The analyses rely on models solved by analytical techniques accompanied by computer simulations and laboratory experiments. This monograph can not only be a bridge linking three first-class disciplines, i.e., physics, thermophysics, and materials science, but also contribute to interdisciplinary development.

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