Gmsh for Python Copyright: Open Access

Gmsh for Python Copyright: Open Access

Gmsh for Python Copyright: Open Access

The validation of numerical models for large lakes is difficult because of sparse field observations. In this study, a Froude-Rossby scaled physical model of Lake Ontario, North America, is used to support numerical simulations. Experimental data are consistent with available field observations and provide a more comprehensive view of lake-wide features that include, in the absence of wind, strong eastward flows along both northern and southern shorelines, a large cyclonic gyre in the Rochester basin, and smaller midlake cyclonic eddies. With a west wind (most common direction), a well-defined westward flow in the middle of the lake separates an anticyclonic gyre in the north from a cyclonic gyre in the south. A review of numerical models shows that most models can capture general features of these observed patterns but do not always reproduce all details, especially in nearshore regions. A numerical model based on the Environmental Fluid Dynamics Code (EFDC), with a 200-m resolution in nearshore regions, is developed.

There is an attempt by conventional oil and gas companies to reduce greenhouse gas emissions through sustainability practices to maintain a position of relevance in a low-carbon energy future. One of such measures is the idea of upstream energy integration (or field electrification), yet emerging and in its nascency. The concept of energy integration is to electrify upstream petroleum production operations through renewables to reduce carbon intensity and mitigate process emissions. While this seems promising, its dynamics and wider ramifications remain unexplored in the scholarly literature. Drawing on the socio-technical transition theory and adopting a qualitative approach to energy systems analysis, this perspective type piece identifies and discusses the implications of the emerging trend of upstream energy integration. The analysis proceeds with three thematic parallels and five central motifs that potentially set research and policy framing agendas to complement existing energy governance frameworks. These include Process energy needs, Resources and materials sourcing, Embodied energy implications, Scalar deployment costing and Temporal dynamics for transition (the PREST framework).

The recent report (the Sixth Assessment Report of Working Group 1) of the Intergovernmental Panel on Climate Change clearly points to the urgency of global climate action. Optimal governance regimes are necessary for climate change mitigation in major greenhouse gas-emitting countries and economic sectors. Given our study's domain, the 'climate change governance' concept suffices as our theoretical framework. Adopting comparative legal and policy analysis and the case study approach, we examine the climate governance regimes in four regional carbon-intensive countries - South Africa, China, Germany, and the United States of America - with the primary objective of identifying areas for improving their regulatory capacity to mitigate climate change. Thus, we examine the relationship between climate policy goals/targets, the prevailing policy environment, and supportive strategies for achieving policy goals in our case study countries. Drawing on the climate governance literature, we adopt 'target setting', 'supportive measures/strategies', 'comprehensiveness', and 'oversight body' as the indices for our analysis. Our results reveal striking similarities and contrasts in the focus countries, signalling opportunities for improvements across different parameters. The study suggests the need for policy symmetry between governance (emissions reduction) goals and regime design elements such as proportional supportive strategies and comprehensive coverage of carbon-intensive economy sectors. We also canvass the necessity of avoiding policy and institutional fragmentations that hamper the emergence of clear and well-coordinated climate policy direction in countries. As climate change governance is now at a critical juncture, this study will significantly improve the regimes of our focus countries and other jurisdictions with similar peculiarities.

Understanding the dynamic behaviour of Sub-Saharan African households as they move along the energy ladder is essential for the energy transition in developing countries. This study applies Fixed and Random effect panel data models to analyse the drivers of rural and urban households' energy transition in Nigeria from 2010 to 2018. The estimation results from the panel models with robust standard errors show that rural households tend to increase their expenses on fuel sources that potentially substitute the energy source whose prices have increased. However, there is no significant relationship between the price and expenditure on different fuels in urban households. Irrespective of spatiality, we find that aside from income - education, household size, and internet access are essential drivers of household fuel choices. More importantly, we find evidence of reverse energy transition. We argue that this reverse energy transition limits the shift to cleaner fuels and increases the economic vulnerabilities of rural households. Our analysis also reveals that Nigerians' preference for fuels is shifting to be price inelastic. We make a strong case for policies and interventions that raise household income, empower women, reduce the cost of living, and improve clean and affordable energy access to encourage energy transition.

Lack of access to clean cooking energy systems negatively affects the health and welfare of millions of people in developing countries. Different factors such as household income, household size, fuel price, and information spread have been identified as barriers to the widespread uptake of clean cooking systems. However, analyses exploring the dynamic influences of these factors towards accelerating clean cooking from the long-term perspective are limited. Here, we employ a system dynamics modelling framework to simulate how various strategies could affect the adoption of clean cooking systems in Nigeria over time. Our results reveal that clean cooking adoption is a fluctuating process, and the trends present a non-linear behaviour. We found that the adoption of clean cooking energy systems would occur faster early in the simulating year among urban households than in rural households. The results indicate that, at low prices of liquefied petroleum gas, many rural households will switch to clean cookstoves with higher adoption rates than consumers in urban households. Additionally, results from baseline scenario analysis revealed that, without significant policy interventions, not all households would switch to clean cooking. Our analysis further indicates that households with fewer members tend to transition quicker to clean cooking options than larger households. The impact of clean cooking due to communication among households would be more significant among rural households than among urban households. While the model results are perceptive, we emphasise that potent policies are needed to accelerate the diffusion and adoption of clean cooking energy systems in Nigeria and other African countries. (C) 2022 The Society for Policy Modeling. Published by Elsevier Inc. All rights reserved..

The cement sector in South Africa contributes approximately 1 % to the South African national green-house gas inventory. In line with the country's GDP increasing which will cause population to increase, the demand for housing, public and private structural infrastructures continues to increase. It is assumed that the demand for cement will also increase proportionally as well as its associated CO2 emission. The purpose of this study is to firstly; review previous energy modelling strategies in South Africa and specifically in the cement industry if any in order to examine the alignment of the cement industry's strategies with that of the South African government since becoming part of the Paris agreement signatories. Previous studies of energy efficiency, modelling, and GHG emissions were analyzed and reviewed for the understanding of the readiness of South Africa's cement industry to tackle her energy and global warming issues. South Africa is in a position to tackle the energy efficiency and GHG emissions problem through redesigning and consolidated critical data collection will, driven by the government and responsible stakeholders. Secondly; if any previous strategies are in place but in isolation, to examine the potential for long-term energy efficiency strategies and CO2 mitigation options for the cement sector in South Africa; as these two elements have a distinguishable link. Cement production is an energy-intensive process that consists of combustion-and process-related emissions. This study will employ-two modelling frameworks to examine strategies for reducing cement sector energy demand and associated CO2 emission for the period 2015 to 2050 (35 years) with 5-year intervals parallel to the Paris agreement. After reviewing energy models, the study will employ the low emissions analysis platform (LEAP) to model possible energy saving methods in the combustion process and other forms of energy supply in the context of South African cement sector. The existing reviewed methods and results will be compared and the LEAP will provide a second set of comparable results in order to influence policy and inform decision-making. For process-related emissions in the sector, the study will develop an excel-based model to examine possible strategies for reducing CO2 emission in the sector. The results will be examined in terms of cumulative energy savings, GHG emissions, and marginal abatement cost of carbon. (c) 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Engineering for a Sustainable World.