Relevant bibliographies by topics / Hydrologic Ensemble Prediction Systems

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Academic literature on the topic 'Hydrologic Ensemble Prediction Systems'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Hydrologic Ensemble Prediction Systems"

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Thirel, Guillaume, Fabienne Rousset-Regimbeau, Eric Martin, and Florence Habets. "On the Impact of Short-Range Meteorological Forecasts for Ensemble Streamflow Predictions." Journal of Hydrometeorology 9, no. 6 (December 1, 2008): 1301–17. http://dx.doi.org/10.1175/2008jhm959.1.

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Abstract Ensemble streamflow prediction systems are emerging in the international scientific community in order to better assess hydrologic threats. Two ensemble streamflow prediction systems (ESPSs) were set up at Météo-France using ensemble forecasts from the European Centre for Medium-Range Weather Forecasts (ECMWF) Ensemble Prediction System for the first one, and from the Prévision d’Ensemble Action de Recherche Petite Echelle Grande Echelle (PEARP) ensemble prediction system of Météo-France for the second. This paper presents the evaluation of their capacities to better anticipate severe hydrological events and more generally to estimate the quality of both ESPSs on their globality. The two ensemble predictions were used as input for the same hydrometeorological model. The skills of both ensemble streamflow prediction systems were evaluated over all of France for the precipitation input and streamflow prediction during a 569-day period and for a 2-day short-range scale. The ensemble streamflow prediction system based on the PEARP data was the best for floods and small basins, and the ensemble streamflow prediction system based on the ECMWF data seemed the best adapted for low flows and large basins.
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Shrestha, Rajesh R., Markus A. Schnorbus, and Alex J. Cannon. "A Dynamical Climate Model–Driven Hydrologic Prediction System for the Fraser River, Canada." Journal of Hydrometeorology 16, no. 3 (May 27, 2015): 1273–92. http://dx.doi.org/10.1175/jhm-d-14-0167.1.

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Abstract Recent improvements in forecast skill of the climate system by dynamical climate models could lead to improvements in seasonal streamflow predictions. This study evaluates the hydrologic prediction skill of a dynamical climate model–driven hydrologic prediction system (CM-HPS), based on an ensemble of statistically downscaled outputs from the Canadian Seasonal to Interannual Prediction System (CanSIPS). For comparison, historical and future climate traces–driven ensemble streamflow prediction (ESP) was employed. The Variable Infiltration Capacity model (VIC) hydrologic model setup for the Fraser River basin, British Columbia, Canada, was used as a test bed for the two systems. In both cases, results revealed limited precipitation prediction skill. For streamflow prediction, the ESP approach has very limited or no correlation skill beyond the months influenced by initial hydrologic conditions, while the CM-HPS has moderately better correlation skill, attributable to the enhanced temperature prediction skill that results from CanSIPS’s ability to predict El Niño–Southern Oscillation (ENSO) and its teleconnections. The root-mean-square error, bias, and categorical skills for the two methods are mostly similar. Hydrologic modeling uncertainty also affects the prediction skill, and in some cases prediction skill is constrained by hydrologic model skill. Overall, the CM-HPS shows potential for seasonal streamflow prediction, and further enhancements in climate models could potentially to lead to more skillful hydrologic predictions.
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Velázquez, J. A., F. Anctil, M. H. Ramos, and C. Perrin. "Can a multi-model approach improve hydrological ensemble forecasting? A study on 29 French catchments using 16 hydrological model structures." Advances in Geosciences 29 (February 28, 2011): 33–42. http://dx.doi.org/10.5194/adgeo-29-33-2011.

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Abstract. An operational hydrological ensemble forecasting system based on a meteorological ensemble prediction system (M-EPS) coupled with a hydrological model searches to capture the uncertainties associated with the meteorological prediction to better predict river flows. However, the structure of the hydrological model is also an important source of uncertainty that has to be taken into account. This study aims at evaluating and comparing the performance and the reliability of different types of hydrological ensemble prediction systems (H-EPS), when ensemble weather forecasts are combined with a multi-model approach. The study is based on 29 catchments in France and 16 lumped hydrological model structures, driven by the weather forecasts from the European centre for medium-range weather forecasts (ECMWF). Results show that the ensemble predictions produced by a combination of several hydrological model structures and meteorological ensembles have higher skill and reliability than ensemble predictions given either by one single hydrological model fed by weather ensemble predictions or by several hydrological models and a deterministic meteorological forecast.
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Yuan, Xing, Joshua K. Roundy, Eric F. Wood, and Justin Sheffield. "Seasonal Forecasting of Global Hydrologic Extremes: System Development and Evaluation over GEWEX Basins." Bulletin of the American Meteorological Society 96, no. 11 (November 1, 2015): 1895–912. http://dx.doi.org/10.1175/bams-d-14-00003.1.

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Abstract Seasonal hydrologic extremes in the form of droughts and wet spells have devastating impacts on human and natural systems. Improving understanding and predictive capability of hydrologic extremes, and facilitating adaptations through establishing climate service systems at regional to global scales are among the grand challenges proposed by the World Climate Research Programme (WCRP) and are the core themes of the Regional Hydroclimate Projects (RHP) under the Global Energy and Water Cycle Experiment (GEWEX). An experimental global seasonal hydrologic forecasting system has been developed that is based on coupled climate forecast models participating in the North American Multimodel Ensemble (NMME) project and an advanced land surface hydrologic model. The system is evaluated over major GEWEX RHP river basins by comparing with ensemble streamflow prediction (ESP). The multimodel seasonal forecast system provides higher detectability for soil moisture droughts, more reliable low and high f low ensemble forecasts, and better “real time” prediction for the 2012 North American extreme drought. The association of the onset of extreme hydrologic events with oceanic and land precursors is also investigated based on the joint distribution of forecasts and observations. Climate models have a higher probability of missing the onset of hydrologic extremes when there is no oceanic precursor. But oceanic precursor alone is insufficient to guarantee a correct forecast—a land precursor is also critical in avoiding a false alarm for forecasting extremes. This study is targeted at providing the scientific underpinning for the predictability of hydrologic extremes over GEWEX RHP basins and serves as a prototype for seasonal hydrologic forecasts within the Global Framework for Climate Services (GFCS).
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Saleh, F., V. Ramaswamy, N. Georgas, A. F. Blumberg, and J. Pullen. "Inter-comparison between retrospective ensemble streamflow forecasts using meteorological inputs from ECMWF and NOAA/ESRL in the Hudson River sub-basins during Hurricane Irene (2011)." Hydrology Research 50, no. 1 (August 20, 2018): 166–86. http://dx.doi.org/10.2166/nh.2018.182.

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Abstract The objective of this work was to evaluate the benefits of using multi-model meteorological ensembles in representing the uncertainty of hydrologic forecasts. An inter-comparison experiment was performed using meteorological inputs from different models corresponding to Hurricane Irene (2011), over three sub-basins of the Hudson River basin. The ensemble-based precipitation inputs were used as forcing in a hydrological model to retrospectively forecast hourly streamflow, with a 96-hour lead time. The inputs consisted of 73 ensemble members, namely one high-resolution ECMWF deterministic member, 51 ECMWF members and 21 NOAA/ESRL (GEFS Reforecasts v2) members. The precipitation inputs were resampled to a common grid using the bilinear resampling method that was selected upon analysing different resampling methods. The results show the advantages of forcing hydrologic forecasting systems with multi-model ensemble forecasts over using deterministic and single model ensemble forecasts. The work showed that using the median of all 73 ensemble streamflow forecasts relatively improved the Nash–Sutcliffe Efficiency and lowered the biases across the examined sub-basins, compared with using the ensemble median from an individual model. This research contributes to the growing literature that demonstrates the promising capabilities of multi-model systems to better describe the uncertainty in streamflow predictions.
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Franz, K. J., and T. S. Hogue. "Evaluating uncertainty estimates in hydrologic models: borrowing measures from the forecast verification community." Hydrology and Earth System Sciences 15, no. 11 (November 15, 2011): 3367–82. http://dx.doi.org/10.5194/hess-15-3367-2011.

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Abstract. The hydrologic community is generally moving towards the use of probabilistic estimates of streamflow, primarily through the implementation of Ensemble Streamflow Prediction (ESP) systems, ensemble data assimilation methods, or multi-modeling platforms. However, evaluation of probabilistic outputs has not necessarily kept pace with ensemble generation. Much of the modeling community is still performing model evaluation using standard deterministic measures, such as error, correlation, or bias, typically applied to the ensemble mean or median. Probabilistic forecast verification methods have been well developed, particularly in the atmospheric sciences, yet few have been adopted for evaluating uncertainty estimates in hydrologic model simulations. In the current paper, we overview existing probabilistic forecast verification methods and apply the methods to evaluate and compare model ensembles produced from two different parameter uncertainty estimation methods: the Generalized Uncertainty Likelihood Estimator (GLUE), and the Shuffle Complex Evolution Metropolis (SCEM). Model ensembles are generated for the National Weather Service SACramento Soil Moisture Accounting (SAC-SMA) model for 12 forecast basins located in the Southeastern United States. We evaluate the model ensembles using relevant metrics in the following categories: distribution, correlation, accuracy, conditional statistics, and categorical statistics. We show that the presented probabilistic metrics are easily adapted to model simulation ensembles and provide a robust analysis of model performance associated with parameter uncertainty. Application of these methods requires no information in addition to what is already available as part of traditional model validation methodology and considers the entire ensemble or uncertainty range in the approach.
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Franz, K. J., and T. S. Hogue. "Evaluating uncertainty estimates in hydrologic models: borrowing measures from the forecast verification community." Hydrology and Earth System Sciences Discussions 8, no. 2 (March 30, 2011): 3085–131. http://dx.doi.org/10.5194/hessd-8-3085-2011.

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Abstract. The hydrologic community is generally moving towards the use of probabilistic estimates of streamflow, primarily through the implementation of Ensemble Streamflow Prediction (ESP) systems, ensemble data assimilation methods, or multi-modeling platforms. However, evaluation of probabilistic outputs has not necessarily kept pace with ensemble generation. Much of the modeling community is still performing model evaluation using standard deterministic measures, such as error, correlation, or bias, typically applied to the ensemble mean or median. Probabilistic forecast verification methods have been well developed, particularly in the atmospheric sciences yet, few have been adopted for evaluating uncertainty estimates in hydrologic model simulations. In the current paper, we overview existing probabilistic forecast verification methods and apply the methods to evaluate and compare model ensembles produced from different parameter uncertainty estimation methods. The Generalized Uncertainty Likelihood Estimator (GLUE), a modified version of GLUE, and the Shuffle Complex Evolution Metropolis (SCEM) are used to generate model ensembles for the National Weather Service SACramento Soil Moisture Accounting (SAC-SMA) model for 12 forecast basins located in the Southeastern United States. We evaluate the model ensembles using relevant metrics in the following categories: distribution, correlation, accuracy, conditional statistics, and categorical statistics. We show that the probabilistic metrics are easily adapted to model simulation ensembles and provide a robust analysis of parameter uncertainty, one that is commensurate with the dimension of the ensembles themselves. Application of these methods requires no information in addition to what is already available as part of traditional model validation methodology and considers the entire ensemble or uncertainty range in the approach.
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Canli, Ekrem, Martin Mergili, Benni Thiebes, and Thomas Glade. "Probabilistic landslide ensemble prediction systems: lessons to be learned from hydrology." Natural Hazards and Earth System Sciences 18, no. 8 (August 16, 2018): 2183–202. http://dx.doi.org/10.5194/nhess-18-2183-2018.

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Abstract. Landslide forecasting and early warning has a long tradition in landslide research and is primarily carried out based on empirical and statistical approaches, e.g., landslide-triggering rainfall thresholds. In the last decade, flood forecasting started the operational mode of so-called ensemble prediction systems following the success of the use of ensembles for weather forecasting. These probabilistic approaches acknowledge the presence of unavoidable variability and uncertainty when larger areas are considered and explicitly introduce them into the model results. Now that highly detailed numerical weather predictions and high-performance computing are becoming more common, physically based landslide forecasting for larger areas is becoming feasible, and the landslide research community could benefit from the experiences that have been reported from flood forecasting using ensemble predictions. This paper reviews and summarizes concepts of ensemble prediction in hydrology and discusses how these could facilitate improved landslide forecasting. In addition, a prototype landslide forecasting system utilizing the physically based TRIGRS (Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability) model is presented to highlight how such forecasting systems could be implemented. The paper concludes with a discussion of challenges related to parameter variability and uncertainty, calibration and validation, and computational concerns.
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Ye, Jinyin, Yuehong Shao, and Zhijia Li. "Flood Forecasting Based on TIGGE Precipitation Ensemble Forecast." Advances in Meteorology 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/9129734.

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TIGGE (THORPEX International Grand Global Ensemble) was a major part of the THORPEX (Observing System Research and Predictability Experiment). It integrates ensemble precipitation products from all the major forecast centers in the world and provides systematic evaluation on the multimodel ensemble prediction system. Development of meteorologic-hydrologic coupled flood forecasting model and early warning model based on the TIGGE precipitation ensemble forecast can provide flood probability forecast, extend the lead time of the flood forecast, and gain more time for decision-makers to make the right decision. In this study, precipitation ensemble forecast products from ECMWF, NCEP, and CMA are used to drive distributed hydrologic model TOPX. We focus on Yi River catchment and aim to build a flood forecast and early warning system. The results show that the meteorologic-hydrologic coupled model can satisfactorily predict the flow-process of four flood events. The predicted occurrence time of peak discharges is close to the observations. However, the magnitude of the peak discharges is significantly different due to various performances of the ensemble prediction systems. The coupled forecasting model can accurately predict occurrence of the peak time and the corresponding risk probability of peak discharge based on the probability distribution of peak time and flood warning, which can provide users a strong theoretical foundation and valuable information as a promising new approach.
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Carlberg, Bradley, Kristie Franz, and William Gallus. "A Method to Account for QPF Spatial Displacement Errors in Short-Term Ensemble Streamflow Forecasting." Water 12, no. 12 (December 13, 2020): 3505. http://dx.doi.org/10.3390/w12123505.

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To account for spatial displacement errors common in quantitative precipitation forecasts (QPFs), a method using systematic shifting of QPF fields was tested to create ensemble streamflow forecasts. While previous studies addressed spatial displacement using neighborhood approaches, shifting of QPF accounts for those errors while maintaining the structure of predicted systems, a feature important in hydrologic forecasts. QPFs from the nine-member High-Resolution Rapid Refresh Ensemble were analyzed for 46 forecasts from 6 cases covering 17 basins within the National Weather Service North Central River Forecast Center forecasting region. Shifts of 55.5 and 111 km were made in the four cardinal and intermediate directions, increasing the ensemble size to 81 members. These members were input into a distributed hydrologic model to create an ensemble streamflow prediction. Overall, the ensemble using the shifted QPFs had an improved frequency of non-exceedance and probability of detection, and thus better predicted flood occurrence. However, false alarm ratio did not improve, likely because shifting multiple QPF ensembles increases the potential to place heavy precipitation in a basin where none actually occurred. A weighting scheme based on a climatology of displacements was tested, improving overall performance slightly compared to the approach using non-weighted members.
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Dissertations / Theses on the topic "Hydrologic Ensemble Prediction Systems"

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Brochero, Darwin. "Hydroinformatics and diversity in hydrological ensemble prediction systems." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29908/29908.pdf.

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Nous abordons la prévision probabiliste des débits à partir de deux perspectives basées sur la complémentarité de multiples modèles hydrologiques (diversité). La première exploite une méthodologie hybride basée sur l’évaluation de plusieurs modèles hydrologiques globaux et d’outils d’apprentissage automatique pour la sélection optimale des prédicteurs, alors que la seconde fait recourt à la construction d’ensembles de réseaux de neurones en forçant la diversité. Cette thèse repose sur le concept de la diversité pour développer des méthodologies différentes autour de deux problèmes pouvant être considérés comme complémentaires. La première approche a pour objet la simplification d’un système complexe de prévisions hydrologiques d’ensemble (dont l’acronyme anglais est HEPS) qui dispose de 800 scénarios quotidiens, correspondant à la combinaison d’un modèle de 50 prédictions météorologiques probabilistes et de 16 modèles hydrologiques globaux. Pour la simplification, nous avons exploré quatre techniques: la Linear Correlation Elimination, la Mutual Information, la Backward Greedy Selection et le Nondominated Sorting Genetic Algorithm II (NSGA-II). Nous avons plus particulièrement développé la notion de participation optimale des modèles hydrologiques qui nous renseigne sur le nombre de membres météorologiques représentatifs à utiliser pour chacun des modèles hydrologiques. La seconde approche consiste principalement en la sélection stratifiée des données qui sont à la base de l’élaboration d’un ensemble de réseaux de neurones qui agissent comme autant de prédicteurs. Ainsi, chacun d’entre eux est entraîné avec des entrées tirées de l’application d’une sélection de variables pour différents échantillons stratifiés. Pour cela, nous utilisons la base de données du deuxième et troisième ateliers du projet international MOdel Parameter Estimation eXperiment (MOPEX). En résumé, nous démontrons par ces deux approches que la diversité implicite est efficace dans la configuration d’un HEPS de haute performance.
In this thesis, we tackle the problem of streamflow probabilistic forecasting from two different perspectives based on multiple hydrological models collaboration (diversity). The first one favours a hybrid approach for the evaluation of multiple global hydrological models and tools of machine learning for predictors selection, while the second one constructs Artificial Neural Network (ANN) ensembles, forcing diversity within. This thesis is based on the concept of diversity for developing different methodologies around two complementary problems. The first one focused on simplifying, via members selection, a complex Hydrological Ensemble Prediction System (HEPS) that has 800 daily forecast scenarios originating from the combination of 50 meteorological precipitation members and 16 global hydrological models. We explore in depth four techniques: Linear Correlation Elimination, Mutual Information, Backward Greedy Selection, and Nondominated Sorting Genetic Algorithm II (NSGA-II). We propose the optimal hydrological model participation concept that identifies the number of meteorological representative members to propagate into each hydrological model in the simplified HEPS scheme. The second problem consists in the stratified selection of data patterns that are used for training an ANN ensemble or stack. For instance, taken from the database of the second and third MOdel Parameter Estimation eXperiment (MOPEX) workshops, we promoted an ANN prediction stack in which each predictor is trained on input spaces defined by the Input Variable Selection application on different stratified sub-samples. In summary, we demonstrated that implicit diversity in the configuration of a HEPS is efficient in the search for a HEPS of high performance.
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Velazquez, Zapata Juan Alberto. "Evaluation of hydrological ensemble prediction systems for operational forecasting." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27792/27792.pdf.

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Velázquez, Zapata Juan Alberto. "Evaluation of hydrological ensemble prediction systems for operational forecasting." Doctoral thesis, Université Laval, 2010. http://hdl.handle.net/20.500.11794/22245.

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La prévision hydrologique consiste à évaluer quelle sera l'évolution du débit au cours des prochains pas de temps. En utilisant les systèmes actuels de prévisions hydrologiques déterministes, il est impossible d'apprécier simplement l'incertitude associée à ce type de prévision, ce que peut nuire à la prise de décisions. La prévision hydrologique d'ensemble (PHE) cherche à étayer cette incertitude en proposant, à chaque pas de temps, une distribution de probabilité, la prévision probabiliste, en place et lieu d'une estimation unique du débit, la prévision déterministe. La PHE offre de nombreux bénéfices : elle informe l'utilisateur de l'incertitude; elle permet aux autorités qui prennent des décisions de déterminer des critères d'alerte et de mettre en place des scénarios d'urgence; elle fournit les informations nécessaires à la prise de décisions tenant compte du risque. L'objectif principal de cette thèse est l'évaluation de prévisions hydrologiques d'ensemble, en mettant l'accent sur la performance et la fiabilité de celles-ci. Deux techniques pour construire des ensembles sont explorées: a) une première reposant sur des prévisions météorologiques d'ensemble (PME) et b) une seconde exploitant simultanément un ensemble de modèles hydrologiques (multimodèle). En termes généraux, les objectifs de la thèse ont été établis afin d'évaluer : a) les incertitudes associées à la structure du modèle : une étude qui repose sur des simulations journalières issues de dix-sept modèles hydrologiques globaux, pour plus de mille bassins versants français; b) les incertitudes associées à la prévision météorologique : une étude qui exploite la PME du Service Météorologique du Canada et un modèle hydrologique opérationnel semi-distribué, pour un horizon de 3 jours sur douze bassins versants québécois; c) les incertitudes associées à la fois à la structure du modèle et à la prévision météorologique : une étude qui repose à la fois sur la PME issue du ECMWF (European Centre for Medium-Range Weather Forecasts) et seize modèles hydrologiques globaux, pour un horizon de 9 jours sur 29 bassins versants français. Les résultats mets en évidence les avantages des systèmes probabilistes par rapport aux les déterministes. Les prévisions probabilistes sont toutefois souvent affectées par une sous dispersion de leur distribution prédictive. Elles exigent alors un post traitement avant d'être intégrées dans un processus de prise de décision. Plus intéressant encore, les résultats ont également montré le grand potentiel de combiner plusieurs sources d'incertitude, notamment celle associée à la prévision météorologique et celle associée à la structure des modèles hydrologiques. Il nous semble donc prioritaire de continuer à explorer davantage cette approche combinatoire.
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Xu, Jing. "Hydrological post-processing of streamflow forecasts issued from single-model and multimodel ensemble prediction systems." Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69503.

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Les simulations et prévisions hydrologiques sont sujettes à diverses sources d'incertitudes, qui sont malheureusement inévitables. La cascade d'incertitude provient de différentes composantes de la chaîne de prévision, telles que la nature chaotique de l'atmosphère, diverses conditions initiales et limites, une modélisation hydrologique conceptuelle nécessairement inexacte et des paramètres stationnaires incohérents avec un environnement en mutation. La prévision d'ensemble s'avère un outil puissant pour représenter la croissance des erreurs dans le système dynamique et pour capter les incertitudes associées aux différentes sources. Thiboult et al. (2016) ont construit un grand ensemble de 50,000 membres qui tient compte de l'incertitude des prévisions météorologiques, de celle des conditions initiales et l’incertitude structurale. Ce vaste ensemble de 50,000 membres peut également être séparé en sous-composants afin de démêler les trois principales sources d’incertitude mentionnées ci-dessus. Emixi Valdez a donc généré un autre H-EPS multimodèles et calibré pour différents bassins hydrographiques suivant un modèle similaire. Cependant, les résultats obtenus ont été simplement agrégés, en considérant les membres équiprobables. Bien que les systèmes de prévision hydrologique multimodèles puissent être considérés comme un système très complet, ils sont néanmoins exposés à d'autres incertitudes. Par exemple, les prévisions météorologiques des recherches de Thiboult et al. (2016) ont été pré-testées sur certains bassins versants. Ces tests ont montré que les performances dues à l'assimilation de données s'estompent rapidement avec l’horizon de prévision. De plus, en réalité, les utilisateurs peuvent ne pas être en mesure d’utiliser parfaitement tous les outils de prévision (c’est-à-dire les prévisions météorologiques d’ensemble, l’assimilation de données et le schéma multimodèle) conjointement. Par conséquent, il existe toujours une place pour l'amélioration permettant d'augmenter la fiabilité et la résolution des prévisions grâce à un post-traitement statistique approprié. L'objectif global de cette recherche est d'explorer l'utilisation appropriée et les compétences prévisionnelles de divers algorithmes statistiques afin de post-traiter séparément les prévisions de débit provenant d’un modèle unique ainsi que les prévisions multimodèles. Premièrement, nous avons testé l’efficacité de méthodes depost-traitement telles que le Affine Kernel Dressing (AKD) et le Non-dominated sorting genetic algorithm II (NSGA-II) en comparant les prévisions post-traitées par ces méthodes aux soties brutes de systèmes de prévision à modèle unique. Ces deux méthodes sont théoriquement / techniquement distinctes, mais partagent toutefois la même caractéristique, à savoir qu’elles ne nécessitent pas d’hypothèse paramétrique concernant la distribution des membres de la prévision d’ensemble. Elles peuvent donc être considérées comme des méthodes de post-traitement non paramétriques. Dans cette étude, l'analyse des fronts de Pareto générés avec NSGA-II a démontré la supériorité de l'ensemble post-traité en éliminant efficacement les biais des prévisions et en maintenant une bonne dispersion pour tous les horizons de prévision. Deux autres méthodes de post-traitement, à savoir le Bayesian Model Averaging (BMA) et le Copula-BMA, ont également été comparées. Ces deux méthodes ont permis d’obtenir des distributions prédictives à partir de prévisions de débit journalier émises par cinq systèmes de prévision d'ensemble hydrologiques différents. Les poids obtenus par la méthode du BMA quantifient le niveau de confiance que l'on peut avoir à l'égard de chaque modèle hydrologique candidat et conduisent à une fonction de densité prédictive (PDF) contenant des informations sur l'incertitude. Le BMA améliore la qualité globale des prévisions, principalement en maintenant la dispersion de l'ensemble avec l’horizon de prévision. Il a également la capacité d’améliorer la fiabilité des systèmes multimodèles qui n’incluent que deux sources d’incertitudes. Le BMA est donc efficace pour améliorer la fiabilité et la résolution des prévisions hydrologiques. Toutefois, le BMA souffre de limitations dues au fait que les fonctions de densité de probabilité conditionnelle (PDF) doivent suivre une distribution paramétrique connue (ex., normale, gamma). Par contre, le modèle prédictif Copula-BMA ne requiert pas une telle hypothèse et élimine aussi l'étape de transformation de puissance, qui est nécessaire pour le BMA. Dans cette étude, onze types de distributions marginales univariées et six fonctions de copule de différents niveaux de complexité ont été explorés dans un cadre Copula-BMA. Cela a permis de représenter de manière exhaustive la structure de dépendance entre des couples de débits prévus et observés. Les résultats démontrent la supériorité du Copula-BMA par rapport au BMA pour réduire le biais dans les prévisions et maintenir une dispersion appropriée pour tous les horizons de prévision.
Hydrological simulations and forecasts are subject to various sources of uncertainties. Forecast uncertainties are unfortunately inevitable when conducting the deterministic analysis of a dynamical system. The cascade of uncertainty originates from different components of the forecasting chain, such as the chaotic nature of the atmosphere, various initial conditions and boundaries, necessarily imperfect hydrologic modeling, and the inconsistent stationnarity assumption in a changing environment. Ensemble forecasting is a powerful tool to represent error growth in the dynamical system and to capture the uncertainties associated with different sources. Thiboult et al. (2016) constructed a 50,000-member great ensemble that accounts for meteorological forcing uncertainty, initial conditions uncertainty, and structural uncertainty. This large ensemble can also be separated into sub-components to untangle the three main sources of uncertainties mentioned above. In asimilar experiment, another multimodel hydrological ensemble forecasting system implemented for different catchments was produced by Emixi Valdez. However,in the latter case, model outputs were simply pooled together, considering the members equiprobable. Although multimodel hydrological ensemble forecasting systems can be considered very comprehensive, they can still underestimate the total uncertainty. For instance, the meteorological forecasts in there search of Thiboult et al. (2016) were pre-tested on some watersheds. It was found out that the forecasting performance of data assimilation fades away quickly as the lead time progresses. In addition, operational forecasts users may not able to perfectly utilize all the forecasting tools (i.e., meteorological ensemble forcing, data assimilation, and multimodel) jointly. Therefore, there is still room for improvement to enhance the forecasting skill of such systems through proper statistical post-processing.The global objective of this research is to explore the proper use and predictive skill of various statistical post-processing algorithms by testing them on single-model and multimodel ensemble stream flow forecasts. First, we tested the post-processing skills of Affine kernel dressing (AKD) and Non-dominated sorting genetic algorithm II (NSGA-II) over single-model H-EPSs. Those two methods are theoretically/technically distinct yet are both non-parametric. They do not require the raw ensemble members to follow a specific parametric distribution.AKD-transformed ensembles and the Pareto fronts generated with NSGA-II demonstrated the superiority of post-processed ensembles compared to raw ensembles. Both methods where efficient at eliminating biases and maintaining a proper dispersion for all forecasting horizons. For multimodel ensembles, two post-processors, namely Bayesian model averaging (BMA) and the integrated copula-BMA, are compared for deriving a pertinent joint predictive distribution of daily streamflow forecasts issued by five different single-model hydrological ensemble prediction systems (H-EPSs). BMA assign weights to different models. Forecasts from all models are then combined to generate more skillful and reliable probabilistic forecasts. BMA weights quantify the level of confidence one can have regarding each candidate hydrological model and lead to a predictive probabilistic density function (PDF) containing information about uncertainty. BMA improves the overall quality of forecasts mainly by maintaining the ensemble dispersion with the lead time. It also improves the reliability and skill of multimodel systems that only include two sources of uncertainties compared to the 50,000-member great ensemble from Thiboult et al (2016). Furthermore, Thiboult et al. (2016) showed that the meteorological forecasts they used were biased and unreliable on some catchments. BMA improves the accuracy and reliability of the hydrological forecasts in that case as well.However, BMA suffers from limitations pertaining to its conditional probability density functions (PDFs), which must follow a known parametric distribution form (e.g., normal, gamma). On the contrary, Copula-BMA predictive model fully relaxes this constraint and also eliminates the power transformation step. In this study, eleven univariate marginal distributions and six copula functions are explored in a Copula-BMA framework for comprehensively reflecting the dependence structure between pairs of forecasted and observed streamflow. Results demonstrate the superiority of the Copula-BMAcompared to BMA in eliminating biases and maintaining an appropriate ensemble dispersion for all lead-times.
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Wood, Andrew W. "Using climate model ensemble forecasts for seasonal hydrologic prediction /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10205.

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Duncan, Andrew Paul. "The analysis and application of artificial neural networks for early warning systems in hydrology and the environment." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/17569.

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Artificial Neural Networks (ANNs) have been comprehensively researched, both from a computer scientific perspective and with regard to their use for predictive modelling in a wide variety of applications including hydrology and the environment. Yet their adoption for live, real-time systems remains on the whole sporadic and experimental. A plausible hypothesis is that this may be at least in part due to their treatment heretofore as “black boxes” that implicitly contain something that is unknown, or even unknowable. It is understandable that many of those responsible for delivering Early Warning Systems (EWS) might not wish to take the risk of implementing solutions perceived as containing unknown elements, despite the computational advantages that ANNs offer. This thesis therefore builds on existing efforts to open the box and develop tools and techniques that visualise, analyse and use ANN weights and biases especially from the viewpoint of neural pathways from inputs to outputs of feedforward networks. In so doing, it aims to demonstrate novel approaches to self-improving predictive model construction for both regression and classification problems. This includes Neural Pathway Strength Feature Selection (NPSFS), which uses ensembles of ANNs trained on differing subsets of data and analysis of the learnt weights to infer degrees of relevance of the input features and so build simplified models with reduced input feature sets. Case studies are carried out for prediction of flooding at multiple nodes in urban drainage networks located in three urban catchments in the UK, which demonstrate rapid, accurate prediction of flooding both for regression and classification. Predictive skill is shown to reduce beyond the time of concentration of each sewer node, when actual rainfall is used as input to the models. Further case studies model and predict statutory bacteria count exceedances for bathing water quality compliance at 5 beaches in Southwest England. An illustrative case study using a forest fires dataset from the UCI machine learning repository is also included. Results from these model ensembles generally exhibit improved performance, when compared with single ANN models. Also ensembles with reduced input feature sets, using NPSFS, demonstrate as good or improved performance when compared with the full feature set models. Conclusions are drawn about a new set of tools and techniques, including NPSFS and visualisation techniques for inspection of ANN weights, the adoption of which it is hoped may lead to improved confidence in the use of ANN for live real-time EWS applications.
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Cunningham, Jeffrey G. "Applying ensemble prediction systems to Department of Defense operations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FCunningham.pdf.

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Thesis (M.S. in Meteorology)--Naval Postgraduate School, March 2006.
Thesis Advisor(s): Carlyle H. Wash, Patrick A. Harr. "March 2006." Includes bibliographical references (p. 129). Also available online.
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Pearman, Douglas W. "Evaluating tropical cyclone forecast track uncertainty using a grand ensemble of ensemble prediction systems." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5465.

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Approved for public release; distribution is unlimited.
The skill of a combined grand ensemble (GE), which is constructed from three operational global ensemble prediction systems (EPS), is evaluated with respect to the probability forecast of a tropical cyclone (TC) being within a specified area. Anisotropic probability ellipses are defined from the GE to contain 68% of the ensemble members. Forecast reliability is based on whether the forecast verifying position is within the ellipse. A sharpness parameter is based on the size of the GE-based probability ellipse relative to other operational forecast probability ellipses. For the 2010 Atlantic TC season, results indicate that the GE ellipses exhibit a high degree of reliability whereas the operational probability circle tends to be over-dispersive. Additionally, the GE ellipse tends to be sharper than the operational product for forecast intervals beyond 48 hours. The size and shape of the GE ellipses varied with TC track types, which suggests that information about the physics of the flow-dependent system is retained whereas isotropic probability ellipses may not reflect variability associated with track type. It is concluded that the GE probability ellipse demonstrates utility for combined EPS to enhance probabilistic forecasts for use as TC-related decision aids, as there is a potential for reducing the sizes of warning areas.
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Sağlam, Şenay Yaşar. "The role of confidence and diversity in dynamic ensemble class prediction systems." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1940.

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Classification is a data mining problem that arises in many real-world applications. A popular approach to tackle these classification problems is using an ensemble of classifiers that combines the collective knowledge of several classifiers. Most popular methods create a static ensemble, in which a single ensemble is constructed or chosen from a pool of classifiers and used for all new data instances. Two factors that have been frequently used to construct a static ensemble are the accuracy of and diversity among the individual classifiers. There have been many studies investigating how these factors should be combined and how much diversity is required to increase the ensemble's performance. These results have concluded that it is not trivial to build a static ensemble that generalizes well. Recently, a different approach has been undertaken: dynamic ensemble construction. Using a different set of classifiers for each new data instance rather than a single static ensemble of classifiers may increase performance since the dynamic ensemble is not required to generalize across the feature space. Most studies on dynamic ensembles focus on classifiers' competency in the local region in which a new data instance resides or agreement among the classifiers. In this thesis, we propose several other approaches for dynamic class prediction. Existing methods focus on assigned labels or their correctness. We hypothesize that using the class probability estimates returned by the classifiers can enhance our estimate of the competency of classifiers on the prediction. We focus on how to use class prediction probabilities (confidence) along with accuracy and diversity to create dynamic ensembles and analyze the contribution of confidence to the system. Our results show that confidence is a significant factor in the dynamic setting. However, it is still unclear how accurate, diverse, and confident ensemble can best be formed to increase the prediction capability of the system. Second, we propose a system for dynamic ensemble classification based on a new distance measure to evaluate the distance between data instances. We first map data instances into a space defined by the class probability estimates from a pool of two-class classifiers. We dynamically select classifiers (features) and the k-nearest neighbors of a new instance by minimizing the distance between the neighbors and the new instance in a two-step framework. Results of our experiments show that our measure is effective for finding similar instances and our framework helps making more accurate predictions. Classifiers' agreement in the region where a new data instance resides has been considered a major factor in dynamic ensembles. We postulate that the classifiers chosen for a dynamic ensemble should behave similarly in the region in which the new instance resides, but differently outside of this area. In other words, we hypothesize that high local accuracy, combined with high diversity in other regions, is desirable. To verify the validity of this hypothesis we propose two approaches. The first approach focuses on finding the k-nearest data instances to the new instance, which then defines a neighborhood, and maximizes simultaneously local accuracy and distant diversity, based on data instances outside of the neighborhood. The second method considers all data instances to be in the neighborhood, and assigns them weights depending on the distance to the new instance. We demonstrate through several experiments that weighted distant diversity and weighted local accuracy outperform all benchmark methods.
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Shrestha, Rajesh Raj. "River flood prediction systems : towards complementary hydrodynamic, hydrological and data driven models with uncertainty analysis /." Karlsruhe : Institut für Wasser und Gewässerentwicklung Universität Karlsruhe (TH), 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014799092&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Books on the topic "Hydrologic Ensemble Prediction Systems"

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Workshop on Predictability & Limits-to-Prediction in Hydrologic Systems (1st 2000 Boulder, Colo.). Report of a Workshop on Predictability & Limits-to-Prediction in Hydrologic Systems. Washington, D.C: National Academy Press, 2002.

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(US), National Research Council. Report of a Workshop on Predictability & Limits-To-Prediction in Hydrologic Systems. National Academies Press, 2002.

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Report of a Workshop on Predictability & Limits-To-Prediction in Hydrologic Systems. Washington, D.C.: National Academies Press, 2002. http://dx.doi.org/10.17226/10337.

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Water Science and Technology Board, Board on Atmospheric Sciences and Climate, Committee on Hydrologic Science, Division on Earth and Life Studies, and National Research Council. Report of a Workshop on Predictability and Limits-To-Prediction in Hydrologic Systems. National Academies Press, 2002.

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Water Science and Technology Board, Board on Atmospheric Sciences and Climate, Committee on Hydrologic Science, Division on Earth and Life Studies, and National Research Council. Report of a Workshop on Predictability and Limits-To-Prediction in Hydrologic Systems. National Academies Press, 2002.

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Water Science and Technology Board, Board on Atmospheric Sciences and Climate, Committee on Hydrologic Science, Division on Earth and Life Studies, and National Research Council. Report of a Workshop on Predictability and Limits-To-Prediction in Hydrologic Systems. National Academies Press, 2002.

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A geographic information system/hydrologic modeling graphical user interface for flood prediction and assessment. [Champaign, Ill.]: US Army Corps of Engineers, Construction Engineers Research Laboritories, 1994.

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Book chapters on the topic "Hydrologic Ensemble Prediction Systems"

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Pappenberger, F., T. C. Pagano, J. D. Brown, L. Alfieri, D. A. Lavers, L. Berthet, F. Bressand, et al. "Hydrological Ensemble Prediction Systems Around the Globe." In Handbook of Hydrometeorological Ensemble Forecasting, 1–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-40457-3_47-1.

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Pappenberger, Florian, Thomas C. Pagano, J. D. Brown, Lorenzo Alfieri, D. A. Lavers, L. Berthet, F. Bressand, et al. "Hydrological Ensemble Prediction Systems Around the Globe." In Handbook of Hydrometeorological Ensemble Forecasting, 1187–221. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-642-39925-1_47.

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Yang, Shu-Chih, Hsiang-Wen Cheng, Pin-Ying Wu, Zih-Mao Huang, and Chih-Chien Tsai. "Convective-Scale Data Assimilation and Precipitation Prediction with a Local Ensemble Transform Kalman Filter Radar Assimilation System Over Complex Terrain: A Thorough Investigation with the Heavy Rainfall in Taiwan on 16 June 2008." In Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications (Vol. IV), 543–79. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77722-7_21.

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Tiwari, Stuti, and Namrata Dhanda. "Diabetes Prediction Using Ensemble Methods." In Smart Innovation, Systems and Technologies, 405–15. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6068-0_39.

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Jindal, Rajni, Adil Ahmad, and Anshuman Aditya. "Ensemble Based-Cross Project Defect Prediction." In Smart Innovation, Systems and Technologies, 611–20. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3675-2_47.

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Gabralla, Lubna A., Hela Mahersia, and Ajith Abraham. "Ensemble Neurocomputing Based Oil Price Prediction." In Advances in Intelligent Systems and Computing, 293–302. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13572-4_24.

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Adhikari, Bikal, and Subarna Shakya. "Heart Disease Prediction Using Ensemble Model." In Lecture Notes in Networks and Systems, 857–68. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7657-4_69.

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Wadghiri, Mohamed Zaim, Ali Idri, and Touria El Idrissi. "Ensemble Regression for Blood Glucose Prediction." In Advances in Intelligent Systems and Computing, 544–54. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72657-7_52.

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Govinda, K., R. Rajkumar, and Jolly Masih. "Bitcoin Prediction Using Ensemble Modelling." In Artificial Intelligence Systems and the Internet of Things in the Digital Era, 162–67. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77246-8_16.

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Marndi, Ashapurna, and G. K. Patra. "Multidimensional Ensemble LSTM for Wind Speed Prediction." In Communication and Intelligent Systems, 595–606. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1089-9_47.

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Conference papers on the topic "Hydrologic Ensemble Prediction Systems"

1

Madadgar, Shahrbanou, and Hamid Moradkhani. "Improving the Ensemble Streamflow Prediction by Adjusting Hydrologic Ensemble Traces." In World Environmental and Water Resources Congress 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41173(414)392.

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Adams, Thomas, and Joseph Ostrowski. "Short Lead-Time Hydrologic Ensemble Forecasts from Numerical Weather Prediction Model Ensembles." In World Environmental and Water Resources Congress 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41114(371)237.

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Pacheco, Sheilla Ann B. "Breast Cancer Prediction using Ensemble Technique." In 2022 International Conference on Computing, Communication, and Intelligent Systems (ICCCIS). IEEE, 2022. http://dx.doi.org/10.1109/icccis56430.2022.10037589.

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Bajaj, Madhvan, Priyanshu Rawat, Chandradeep Bhatt, Rahul Chauhan, and Teekam Singh. "Heart Disease Prediction using Ensemble ML." In 2023 International Conference on Sustainable Computing and Data Communication Systems (ICSCDS). IEEE, 2023. http://dx.doi.org/10.1109/icscds56580.2023.10104770.

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Qiu, Xiaokang, Yuan Zuo, and Guannan Liu. "ETCF: An Ensemble Model for CTR Prediction." In 2018 15th International Conference on Service Systems and Service Management (ICSSSM). IEEE, 2018. http://dx.doi.org/10.1109/icsssm.2018.8465044.

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Althaph, B., S. V. N. Sreenivasu, and D. Venkata Reddy. "Student Performance Analysis with Ensemble Progressive Prediction." In 2023 5th International Conference on Smart Systems and Inventive Technology (ICSSIT). IEEE, 2023. http://dx.doi.org/10.1109/icssit55814.2023.10060910.

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Wang, Jian, Jin Guo, Yueying Li, Ran Hao, and Hongjun Wang. "Unsupervised clustering ensemble for traffic level prediction." In Conference on Machine learning, Multi Agent and Cyber Physical Systems (FLINS 2022). WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811269264_0066.

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Santhosh, M., M. Dharani Sai, and Sanober Mirza. "Ensemble deep learning model for wind speed prediction." In 2020 21st National Power Systems Conference (NPSC). IEEE, 2020. http://dx.doi.org/10.1109/npsc49263.2020.9331836.

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Adegoke, Vincent F., Daqing Chen, Ebad Banissi, and Safia Barikzai. "Prediction of breast cancer survivability using ensemble algorithms." In 2017 International Conference on Smart Systems and Technologies (SST). IEEE, 2017. http://dx.doi.org/10.1109/sst.2017.8188699.

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Xiang, Chengguan, Mei Chen, and Hanhu Wang. "An Ensemble Method for Medicine Best Selling Prediction." In 2009 Sixth International Conference on Fuzzy Systems and Knowledge Discovery. IEEE, 2009. http://dx.doi.org/10.1109/fskd.2009.245.

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