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Auscultation par GPS d'un barrage en enrochement : modélisation en 3D du comportement du barrage par l'utilisation du logiciel ANSYS / Nadia Bouhouche in XYZ, n° 154 (mars - mai 2018)
[article]
Titre : Auscultation par GPS d'un barrage en enrochement : modélisation en 3D du comportement du barrage par l'utilisation du logiciel ANSYS Type de document : Article/Communication Auteurs : Nadia Bouhouche, Auteur ; Bachir Gourine, Auteur Année de publication : 2018 Article en page(s) : pp 62 - 67 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Topographie
[Termes IGN] auscultation d'ouvrage
[Termes IGN] auscultation topographique
[Termes IGN] barrage
[Termes IGN] déformation d'édifice
[Termes IGN] méthode des éléments finis
[Termes IGN] modélisation 3D
[Termes IGN] topométrie
[Termes IGN] TurquieRésumé : (Auteur) La sécurité des barrages en enrochement ne dépend pas seulement d'une conception appropriée et d'une construction adéquate, mais aussi de la surveillance du comportement réel, non seulement, pendant la construction et pendant la mise en eau, mais tout au long de l'exploitation de l'ouvrage. la surveillance à l'aide de l'instrumentation géodésique et géotechnique appropriée, permet d'avoir un système d'avertissement en cas de comportement anormal de ces barrages. la comparaison des voleurs de déformations calculées lors de la conception avec les déformations mesurées à l'aide des instruments de surveillance permet de valider ou de faire une réévaluation des paramètres utilisés dans les analyses [Szostak-Chrzonowski, 2008] La modélisation du comportement des barrages en enrochement est un processus complexe dans lequel il faut considérer le comportement non linéaire des matériaux de construction, l'interaction entre le barrage et le sol de fondation et/ou le substratum rocheux, l'influence de la charge hydraulique sur le barrage et sur la fondation et les effets de saturation par l'eau. le processus de déformation peut être modélisé en employant la méthode des éléments finis (MEF). Parmi les nombreux logiciels basés sur la méthode des éléments finis, ANSYS 15.0 est celui qui rend l'analyse des structures complexes possible avec moins d'erreurs [Varghese, 2014] Ce travail vise à analyser le comportement des barrages en enrochement à l'aide du logiciel »US, une application o été faite sur le barrage d'Altinkaya en Turquie. Numéro de notice : A2018-089 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89463
in XYZ > n° 154 (mars - mai 2018) . - pp 62 - 67[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 112-2018011 RAB Revue Centre de documentation En réserve L003 Disponible A comparative approach to modelling multiple urban land use changes using tree-based methods and cellular automata: the case of Greater Tokyo Area / Guodong Du in International journal of geographical information science IJGIS, vol 32 n° 3-4 (March - April 2018)
[article]
Titre : A comparative approach to modelling multiple urban land use changes using tree-based methods and cellular automata: the case of Greater Tokyo Area Type de document : Article/Communication Auteurs : Guodong Du, Auteur ; Kong Joo Shin, Auteur ; Liang Yuan, Auteur ; Shunsuke Managi, Auteur Année de publication : 2018 Article en page(s) : pp 757 - 782 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse comparative
[Termes IGN] automate cellulaire
[Termes IGN] changement d'utilisation du sol
[Termes IGN] Tokyo (Japon)
[Termes IGN] utilisation du sol
[Termes IGN] zone urbaineRésumé : (Auteur) Urban multiple land use change (LUC) modelling enables the realistic simulation of LUC processes in complex urban systems; however, such modelling suffers from technical challenges posed by complicated transition rules and high spatial heterogeneity when predicting the LUC of a highly developed area. Tree-based methods are powerful tools for addressing this task, but their predictive capabilities need further examination. This study integrates tree-based methods and cellular automata to simulate multiple LUC processes in the Greater Tokyo Area. We examine the predictive capability of 4 tree-based models – bagged trees, random forests, extremely randomised trees (ERT) and bagged gradient boosting decision trees (bagged GBDT) – on transition probability prediction for 18 land use transitions derived from 8 land use types. We compare the predictive power of a tree-based model with multi-layer perceptron (MLP) and among themselves. The results show that tree-based models generally perform better than MLP, and ERT significantly outperforms the three other tree-based models. The outstanding predictive performance of ERT demonstrates the advantages of introducing bagging ensemble and a high degree of randomisation into transition probability modelling. In addition, through variable importance evaluation, we found the strongest explanatory powers of neighbourhood characteristics for all land use transitions; however, the size of the impacts depends on the neighbourhood land use type and the neighbourhood size. Furthermore, socio-economic and policy factors play important roles in transitions ending with high-rise buildings and transitions related to industrial areas. Numéro de notice : A2018-044 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2017.1410550 En ligne : https://doi.org/10.1080/13658816.2017.1410550 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89266
in International journal of geographical information science IJGIS > vol 32 n° 3-4 (March - April 2018) . - pp 757 - 782[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-2018022 RAB Revue Centre de documentation En réserve L003 Disponible 079-2018021 RAB Revue Centre de documentation En réserve L003 Disponible Image classification-based ground filtering of point clouds extracted from UAV-based aerial photos / Volkan Yilmaz in Geocarto international, vol 33 n° 3 (March 2018)
[article]
Titre : Image classification-based ground filtering of point clouds extracted from UAV-based aerial photos Type de document : Article/Communication Auteurs : Volkan Yilmaz, Auteur ; Berkant Konakoglu, Auteur ; Cigdem Serifoglu, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp 310 - 320 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] algorithme de filtrage
[Termes IGN] classification dirigée
[Termes IGN] classification par séparateurs à vaste marge
[Termes IGN] données localisées 3D
[Termes IGN] drone
[Termes IGN] image aérienne
[Termes IGN] modèle numérique de surface
[Termes IGN] semis de points
[Termes IGN] TurquieRésumé : (Auteur) With the advent of unmanned aerial vehicles (UAVs) for mapping applications, it is possible to generate 3D dense point clouds using stereo images. This technology, however, has some disadvantages when compared to Light Detection and Ranging (LiDAR) system. Unlike LiDAR, digital cameras mounted on UAVs are incapable of viewing beneath the canopy, which leads to sparse points on the bare earth surface. In such cases, it is more challenging to remove points belonging to above-ground objects using ground filtering algorithms generated especially for LiDAR data. To tackle this problem, a methodology employing supervised image classification for filtering 3D point clouds is proposed in this study. A classified image is overlapped with the point cloud to determine the ground points to be used for digital elevation model (DEM) generation. Quantitative evaluation results showed that filtering the point cloud with this methodology has a good potential for high-resolution DEM generation. Numéro de notice : A2018-035 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106049.2016.1250825 En ligne : https://doi.org/10.1080/10106049.2016.1250825 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89213
in Geocarto international > vol 33 n° 3 (March 2018) . - pp 310 - 320[article]A novel approach to site selection: collaborative multi-criteria decision making through geo-social network (case study: public parking) / Zeinab Neisani Samani in ISPRS International journal of geo-information, vol 7 n° 3 (March 2018)
[article]
Titre : A novel approach to site selection: collaborative multi-criteria decision making through geo-social network (case study: public parking) Type de document : Article/Communication Auteurs : Zeinab Neisani Samani, Auteur ; Mohammad Karimi, Auteur ; Ali Asghar Alesheikh, Auteur Année de publication : 2018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] aide à la décision
[Termes IGN] analyse multicritère
[Termes IGN] parking
[Termes IGN] processus de hiérarchisation analytique
[Termes IGN] réseau social
[Termes IGN] TéhéranRésumé : (Auteur) There are many potential factors that are involved in the decision making process of site selection, which makes it a challenging issue. This paper addresses the collaborative decision making concept through a geo-social network to predict site selection for public parking in Tehran, Iran. The presented approach utilized the analytic hierarchy process (AHP) as a multi-criteria decision method (MCDM) for weighting the criteria, which was completed in two stages; once by 50 experts, and then by three different levels of users, including 50 experts, 25 urban managers, and 150 pubic citizens, with respect to the case study area. The fuzzy majority method aggregates the archived results of AHP to determine the preferred locations that are suitable for public parking. The proposed method was implemented using a telegram bot platform. Two main advantages of the collaborative decision making scenario for public urban site selection are the fair distribution of the selected locations and the high satisfaction of users, which increased from 65% to 85%. This study presents an application for site selection based on multi-criteria decision making in a geo-social network context. Numéro de notice : A2018-098 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi7030082 En ligne : https://doi.org/10.3390/ijgi7030082 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89513
in ISPRS International journal of geo-information > vol 7 n° 3 (March 2018)[article]Optimal management of larch (Larix olgensis A. Henry) plantations in Northeast China when timber production and carbon stock are considered / Wei Peng in Annals of Forest Science, vol 75 n° 1 (March 2018)
[article]
Titre : Optimal management of larch (Larix olgensis A. Henry) plantations in Northeast China when timber production and carbon stock are considered Type de document : Article/Communication Auteurs : Wei Peng, Auteur ; Timo Pukkala, Auteur ; Xingji Jin, Auteur ; Fengri Li, Auteur Année de publication : 2018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Chine
[Termes IGN] éclaircie (sylviculture)
[Termes IGN] économie forestière
[Termes IGN] Larix olgensis
[Termes IGN] modèle dynamique
[Termes IGN] plantation forestière
[Termes IGN] production agricole végétale
[Termes IGN] puits de carbone
[Termes IGN] ressources forestières
[Termes IGN] volume en bois
[Vedettes matières IGN] Végétation et changement climatiqueRésumé : (Auteur) Key message : The optimal management of larch (Larix olgensis) plantations in Northeast China consisted of 2 or 3 thinnings and a rotation length of 55–61 years when economic profitability, wood production, and carbon sequestration were simultaneously maximized. Wood production ranged from 5.4 to 11.7 m3 ha−1 a−1, depending on site quality.
Context: L. olgensis is an important tree species in the northeast forest region of China, playing a significant role in the establishment of fast-growing and high-yielding plantation forests in China. However, the management of these plantations has not been optimized in previous studies.
Aims: The objective of the study was to find the optimal combinations of thinning times, thinning types, and rotation length for L. olgensis stands when both timber production and carbon stock are considered.
Methods: First, a growth and yield model was developed to simulate the dynamics of larch plantations. Then, the models were linked with the Hooke and Jeeves optimization algorithm to optimize forest management for two commonly used planting densities and three site qualities.
Results: Two thinnings were found to be suitable for larch plantations when the stand density at 10 years was 2125 trees/ha (corresponding to a planting density of 2500 trees/ha) whereas three thinnings were recommended when the density at 10 years was 2800 trees/ha (planting density of 3300 trees/ha). When the stand density was 2800 trees/ha, the optimal rotation length was 61, 58, and 55 years for site indices (SI) 12, 16, and 20 m (dominant height at 30 years), respectively. The mean annual wood production was 5.4 m3 ha−1 for SI 12, 8.2 m3 ha−1 for SI 16, and 11.7 m3 ha−1 for SI 20. The results were nearly the same for the lower initial stand density. The better the site quality of the stand, the earlier the thinnings were conducted.
Conclusion: In multifunctional forestry, optimal rotation lengths of larch plantations were 10–20 years longer than advised in the current silvicultural recommendations for Northeast China.Numéro de notice : A2018-320 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s13595-018-0739-1 Date de publication en ligne : 04/06/2018 En ligne : https://doi.org/10.1007/s13595-018-0739-1 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90455
in Annals of Forest Science > vol 75 n° 1 (March 2018)[article]Remote estimation of canopy leaf area index and chlorophyll content in Moso bamboo (Phyllostachys edulis (Carrière) J. 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