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Noise generated by aircraft continues to be a pressing issue for society, as an increasing number of people residing in close proximity to airports make noise complaints on a regular basis. The reduction in aircraft noise is therefore a very important engineering task that would require the careful identification of different acoustic sources around the airplane, the understanding of noise source behavior and ranking along flight trajectories, sophisticated measurement techniques, and robust and accurate numerical tools aimed at predicting the generation of noise, the propagation through the atmosphere, and the resulting noise impact along approach and departure flights. For an overall assessment of the situation, it has to be assessed along entire flight trajectories rather than assessing limited operating conditions only. Furthermore, it is highly recommended to apply multiple acoustic metrics and account for different and widespread observer locations along the flight. Only then can the overall situation be adequately captured. Obviously, this is a highly multidisciplinary effort and no single discipline can address this problem. This reprint includes selected research studies with that multidisciplinary context that deal with numerical or experimental investigations that range from the investigation of specific noise sources to the assessment of noise generated by the overall aircraft in operation. Both basic and applied research studies involving the modelling and simulation of aircraft noise are included.

Technology: general issues --- History of engineering & technology --- aircraft noise simulation --- conceptual aircraft design --- noise certification --- ICAO Annex 16 --- PANAM --- RCE --- green aviation --- airport operations --- aircraft noise impact --- noise prediction method --- large eddy simulations --- jet noise --- jet–surface interaction --- aircraft noise --- simulation --- sonAIR --- FLULA2 --- AEDT --- validation with measurements --- low-noise aircraft design --- center of excellence --- Sustainable and Energy-Efficient Aviation (SE2A) --- forward swept wing --- PrADO --- aircraft noise prediction --- supersonic transport aircraft --- NASA STCA --- FAA NPRM --- LTO noise --- SuperSonic Transport (SST) --- aircraft conceptual design --- aeroacoustics --- rotor-stator interaction noise --- porous material --- turbulence modeling --- synthetic turbulence --- CFD --- supersonic aircraft --- ICAO Annex 16 Vol.1 --- multiobjective optimisation --- community noise --- air quality --- sound quality --- noise abatement procedures --- spectral matching

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During the past five decades, we have witnessed a tremendous evolution in water resource system management. Three characteristics of this evolution are of particular note: First, the application of the systems approach to complex water management problems has been established as one of the most important advances in the field of water resource management. Second, the past five decades have brought a remarkable transformation of attitude in the water resource management community towards environmental concerns and action to address these concerns. Third, applying the principles of sustainability to water resource decision-making requires major changes in the objectives on which decisions are based, and an understanding of the complicated inter-relationships between existing ecological, economic, and social factors. The Special Issue includes 15 contributions that offer insights into contemporary problems, approaches, and issues related to the management of complex water resources systems. It will be presumptuous to say that these 15 contributions characterize the success or failure of the systems approach to support water resources decision-making. However, these contributions offer interesting lessons from current experiences and highlight possible future work.

History of engineering & technology --- system dynamics --- system analysis --- complex water system --- uncertainty assessment --- climate change --- regional climate models --- averaging procedures --- HEC-HMS --- Lim river --- Lim water systems --- n/a --- artificial recharge --- groundwater --- treated wastewater --- freshwater resources --- water footprint --- water management --- wine production --- winemaking sector --- Italy --- SuDS --- decision-making --- Soft Systems --- ANP --- modelling --- stakeholder --- systems analyses --- water resources --- planning --- management --- implementation --- political processes --- innovation --- impact --- multi-purpose dam --- water resources systems --- performance-based engineering --- simulation --- resilience --- disaster --- risk --- perception --- community --- Canada --- integrated urban watershed management --- group decision-support system --- risk analysis --- group consensus --- Kashafroud watershed --- water policy --- water portfolio planning --- water resources management --- systems assessment --- adaptive capacity --- coupled human–natural systems --- integrated water resources management --- sociohydrology --- modeling perspectives --- agent-based modeling --- differential equations --- uncertainty --- artificial intelligence --- machine learning --- water resource modelling --- multiobjective optimisation --- river abstraction --- reservoir operation --- stochastic dynamic programming --- fuzzy optimization --- reservoir-river system --- water quantity-quality management --- socio-hydrology --- hydro-sociology --- human-water systems --- human-nature systems --- social-ecological systems --- CHANS --- SES --- socio-hydrologic modeling --- IWRM --- hydrology --- multireservoir operations --- optimization --- multi-agent reinforcement learning --- aggregation–decomposition --- neural networks --- systems --- complexity --- coupled human-natural systems --- aggregation-decomposition

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• Reference Manager
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During the past five decades, we have witnessed a tremendous evolution in water resource system management. Three characteristics of this evolution are of particular note: First, the application of the systems approach to complex water management problems has been established as one of the most important advances in the field of water resource management. Second, the past five decades have brought a remarkable transformation of attitude in the water resource management community towards environmental concerns and action to address these concerns. Third, applying the principles of sustainability to water resource decision-making requires major changes in the objectives on which decisions are based, and an understanding of the complicated inter-relationships between existing ecological, economic, and social factors. The Special Issue includes 15 contributions that offer insights into contemporary problems, approaches, and issues related to the management of complex water resources systems. It will be presumptuous to say that these 15 contributions characterize the success or failure of the systems approach to support water resources decision-making. However, these contributions offer interesting lessons from current experiences and highlight possible future work.

History of engineering & technology --- system dynamics --- system analysis --- complex water system --- uncertainty assessment --- climate change --- regional climate models --- averaging procedures --- HEC-HMS --- Lim river --- Lim water systems --- artificial recharge --- groundwater --- treated wastewater --- freshwater resources --- water footprint --- water management --- wine production --- winemaking sector --- Italy --- SuDS --- decision-making --- Soft Systems --- ANP --- modelling --- stakeholder --- systems analyses --- water resources --- planning --- management --- implementation --- political processes --- innovation --- impact --- multi-purpose dam --- water resources systems --- performance-based engineering --- simulation --- resilience --- disaster --- risk --- perception --- community --- Canada --- integrated urban watershed management --- group decision-support system --- risk analysis --- group consensus --- Kashafroud watershed --- water policy --- water portfolio planning --- water resources management --- systems assessment --- adaptive capacity --- coupled human-natural systems --- integrated water resources management --- sociohydrology --- modeling perspectives --- agent-based modeling --- differential equations --- uncertainty --- artificial intelligence --- machine learning --- water resource modelling --- multiobjective optimisation --- river abstraction --- reservoir operation --- stochastic dynamic programming --- fuzzy optimization --- reservoir-river system --- water quantity-quality management --- socio-hydrology --- hydro-sociology --- human-water systems --- human-nature systems --- social-ecological systems --- CHANS --- SES --- socio-hydrologic modeling --- IWRM --- hydrology --- multireservoir operations --- optimization --- multi-agent reinforcement learning --- aggregation-decomposition --- neural networks --- systems --- complexity