Co-Building A Simulation Model With Various Stakeholders To Assess The Sustainability Of A Regional Agricultural System: How To Articulate Different Types Of Knowledge To Manage Uncertainty?,
2016
INRA, UMR, CIRAD GREEN, TAC-47F
Co-Building A Simulation Model With Various Stakeholders To Assess The Sustainability Of A Regional Agricultural System: How To Articulate Different Types Of Knowledge To Manage Uncertainty?, Caroline Tardivo, Christophe Le Page, Jean-Marc Barbier, Laure Hossard, Roberto Cittadini, Sylvestre Delmotte
International Congress on Environmental Modelling and Software
To assess the sustainability of agricultural systems at a regional scale with regards to possible changes in land use and cropping systems, designing simulation models to explore scenarios with stakeholders is a relevant approach. It implies coping with uncertainties from different areas, originating at both levels of imperfect data sets and misunderstood dynamics (due to incompleteness of knowledge and unexpected systemic effects). Additionally, dealing with various types of knowledge to co-design the model generates ambiguity from the simultaneous presence of multiple frames of reference about the system to be represented. On top of that, specifying scenarios to be explored with …
Study On The Buoyancy Plume Model Coupling With The Effects Of Temperature, Salinity And Sediment,
2016
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University
Study On The Buoyancy Plume Model Coupling With The Effects Of Temperature, Salinity And Sediment, Shen Zia, Huang Juping, Yan Zhongluan, Li Ran, Feng Jingjie
International Congress on Environmental Modelling and Software
The paper developed a three-dimensional model for buoyancy plume coupling with the comprehensive effects of different temperature, sediment and salinity. The model includes mass continuity equation, momentum equation and energy equation, state equation, Renormalization Group (RNG) κ-ε turbulence transport equation, sediment scour equation, salinity advection equation. The discretization scheme of Finite Difference Method (FDM) is used to solve Reynolds-Averaged Navier-Stokes (RANS) equation, combining the discretization method of the central difference scheme and the upwind scheme. A method called Generalized Minimal Residual Algorithm (GMRES) is used to solve velocity-pressure term of discrete equation. The volume of fluid (VOF) method is adopted …
Spatial And Dynamic Sensitivity Analysis Of A Biophysical Model Of Nitrogen Transfers And Transformations At The Landscape Scale.,
2016
UMR ECOSYS, INRA, UMR MIA-Paris, AgroParisTech, Université Paris-Saclay
Spatial And Dynamic Sensitivity Analysis Of A Biophysical Model Of Nitrogen Transfers And Transformations At The Landscape Scale., Jordi Ferrer Saval, Pierre Barbillon, Cyril Benhamou, Patrick Durand, Marie-Luce Taupin, Hervé Monod, Jean-Louis Drouet
International Congress on Environmental Modelling and Software
Modelling complex systems such as agroecosystems often requires the quantification of a large number of input factors. Sensitivity analyses are useful to fix the appropriate spatial and temporal resolution of models and to reduce the number of input factors to be measured or estimated accurately. Comprehensive spatial and dynamic sensitivity analyses were applied to the Nitroscape model, a deterministic spatially distributed model describing nitrogen transfers and transformations in a rural landscape. Simulations were led on a virtual landscape that represented five years of farm management in an intensive rural area of 3 km². Cluster analyses were applied to summarize the …
A Probabilistic Approach For Participatory Evaluation Of Resource Management Systems,
2016
IIIT Chittoor
A Probabilistic Approach For Participatory Evaluation Of Resource Management Systems, Nagesh Kolagani, Palaniappan Ramu, Ravi Gorripati, Alexey Voinov
International Congress on Environmental Modelling and Software
When planning resource management systems in villages, involving stakeholders in planning these systems is known to lead to better results with more success and less conflict. While planning these systems, stakeholders often need to evaluate several alternatives before selecting one which best suits their requirements. A simple multi criteria decision analysis model which they can understand, such as a linear weighted summation model, will help them in evaluating efficiency of each alternative and ranking it. While using such models, a common practice is to obtain weights of each criterion from stakeholders using methods such as analytic hierarchy process. Values of …
Why Does Dynamic Neighbourhood Configuration Matter In Ca-Based Models? An Exploratory Approach For Luxembourg’S Cross-Border Area, H. Omrani, J. P. Antoni, O. Klein
International Congress on Environmental Modelling and Software
Cellular Automata (CA) based modelling is rapidly emerging as a powerful technique to model complex systems in a wide range of applications. The neighbourhood configuration is one of the key components of CA models. Static neighbourhood configuration (SNC) has been used for a long time in various applications. However the efficiency of a CA model is highly influenced by its SNC and cell size. Recently, a few number of researchers working in land change science have proposed a large neighbourhood configuration (e.g., 10×10 Moore neighbourhood instead of the commonly used 3×3 Moore neighbourhood). The large neighbourhood configuration has shown its …
Analyzing Regime Shifts In Agent-Based Models With Equation-Free Analysis,
2016
Stockholm Resilience Centre, Stockholm University
Analyzing Regime Shifts In Agent-Based Models With Equation-Free Analysis, Romina Martin, Spencer Angus Thomas
International Congress on Environmental Modelling and Software
Conventional tools to analyze regime shifts in ecosystems, e.g. stable state and bifurcation analyses, are increasingly adapted to investigate social-ecological systems. The challenge lies in combining the analysis of system dynamics with the analysis of transient dynamics emerging from adaptive and heterogeneous agents. A typical question is, to which extent do micro level interactions contribute to a macro level outcome? We demonstrate the application of a new tool, equation-free analysis, for evaluating the state space from an agent-based model (ABM) on lake restoration. By sidestepping the requirement of an equation describing a systems macroscopic behavior, equation free analysis enables system …
Numerical Simulation Of A New Three-Dimensional Non-Hydrostatic Model,
2016
Huazhong University of Science and Technology
Numerical Simulation Of A New Three-Dimensional Non-Hydrostatic Model, Ling Kang, Shangwen Jiang
International Congress on Environmental Modelling and Software
The hydrostatic pressure assumption has been widely applied in hydrodynamic numerical simulation in rivers and lakes, but it has been found inappropriate in various cases where the vertical acceleration is significant. To this end, this paper proposes a new three-dimensional, non-hydrostatic hydrodynamic model. Based on Navier-Stokes equations with the σ-coordinate transformation, rectangular grid is adopted as the approximation of the study region. For numerical solution, the process includes two steps, the estimated step and the modified step. The FDM is adopted to derive the discretization of the governing equations, and the θ method is employed for equations solution. A numerical …
Using Multi-Objective Optimization To Support Urban Planning,
2016
Institute for Spatial and Landscape Planning, ETH Zürich
Using Multi-Objective Optimization To Support Urban Planning, Jonas Schwaab, Kalyanmoy Deb, Erik Goodman, Sven Lautenbach, Maarten Van Strien, Adrienne Grêt-Regamey
International Congress on Environmental Modelling and Software
Globally urban growth destroys fertile soils and endangers food security. Fertile soils are often located in the vicinity of existing urban areas. Thus, preserving high-quality soils often conflicts with the objective of compact city development. Urban planners have to account for both of these and many other objectives and react to political decisions which put a higher weight on some of them. In addition, urban planners have to deal with uncertain projections on population growth and the demand for housing. We used a multi-objective evolutionary algorithm to show for a case study region in Switzerland how robust urban growth patterns …
A Study Of Non-Point Source Pollution Reduction Of Tea Garden In Taiwan Feitsui Reservoir Watershed,
2016
National Taipei University of Technology
A Study Of Non-Point Source Pollution Reduction Of Tea Garden In Taiwan Feitsui Reservoir Watershed, Chia-Chun Ho, Jen-Yang Lin
International Congress on Environmental Modelling and Software
The water quality of Feitsui Reservoir, which located in the north of Taiwan, has long been maintained mesotrophic to oligotrophic status. However, the pass rate of total phosphorous (TP) concentration of those three upstream streams, Jingualiao River, Daiyujue River, and Beishi River, have not reached 100% compliance with Class A Standard of water quality from Taiwan EPA. The main source of TP is from agriculture fertilizer, especially from the tea garden. In order to remove the non-point sources pollution, the bioretention was adopted and established at the outlet of the runoff drainage path of tea garden. The tea garden area …
Application Of The Swat Model To Investigate Surface Runoff And Nitrate Flux Towards The Mediterranean Sea: Case Of The Tafna Catchment (North-West Of Africa),
2016
LEGEN, Université de Tlemcen, EcoLab, Université de Toulouse
Application Of The Swat Model To Investigate Surface Runoff And Nitrate Flux Towards The Mediterranean Sea: Case Of The Tafna Catchment (North-West Of Africa), Amin Zettam, Amina Taleb, Sabine Sauvage, José Miguel Sanchez-Perez, Laurie Boithias, Nouria Belaidi
International Congress on Environmental Modelling and Software
Water in North-West of Africa is an increasingly valuable resource due to high competition between agriculture, industry and drinking water supply, accentuated by frequent drought conditions in a semi-arid climate. For a few decades, the demographic explosion, the development of agriculture and industry, and the building of water infrastructures (dams) have modified the water fluxes and the biogeochemical cycle of nitrogen towards an increased production of nitrates in waters. The objectives of this study are to propose a modelling approach to quantify the contribution of the Tafna coastal watershed (North-West of Africa) to the flux of nitrates into the Mediterranean …
Implication Of Density-Dependent Flow On Numerical Modelling Of Sw-Gw Interactions,
2016
Monash University (Malaysia Campus)
Implication Of Density-Dependent Flow On Numerical Modelling Of Sw-Gw Interactions, Sina Alaghmand, Philip Brunner, Thomas Graf, Craig Simmons
International Congress on Environmental Modelling and Software
With the growing interest in the last decades in the modelling of hydrogeological processes involved in the water resources management, it has been recognized that the assumption of constant-properties water is no longer adequate in the analysis and simulation of the flow considered in these cases. In recent years, many studies used simplistic approaches that may not represent the aquifer flow dynamics realistically by not accounting for changing fluid density. This study explore the importance of understanding the impact of density-dependent flow on SW-GW interactions. To this aim two synthetic models was developed at large and small scales and various …
The Perceived Value Of A Collaborative Platform Promoting A Rivercare Community About The Effects Of Riverine Management,
2016
University of Twente
The Perceived Value Of A Collaborative Platform Promoting A Rivercare Community About The Effects Of Riverine Management, Vivian Juliette Cortes Arevalo, Robert Jan Den Haan, Fedor Baart, Mascha Van Der Voort, Suzanne Hulscher
International Congress on Environmental Modelling and Software
Riverine measures such as longitudinal training dams, stream restoration, side channels and sediment management are implemented in the Netherlands. Measures aim at accommodating high-water levels while improving the spatial quality of the surroundings. Identifying the actual effects of river measures requires to effectively facilitate the access, discussion and sharing of knowledge between actors of different disciplines or backgrounds. The communication project of RiverCare offers a web-collaborative platform to support knowledge sharing between experts and non-experts actors. RiverCare is a large Dutch research programme studying the riverine and integrated effects of measures towards more collaborative and sustainable management. The knowledge of …
Analysing Urban Development With Decision Tree Based Cellular Automata. Toward An Automatic Transition Rules Creation Process,
2016
ThéMA UMR 6049 Université de Franche-Comté, LISER 11 Porte des Sciences
Analysing Urban Development With Decision Tree Based Cellular Automata. Toward An Automatic Transition Rules Creation Process, V. Judge, O. Klein, J. P. Antoni
International Congress on Environmental Modelling and Software
Land use evolution study has become a major stake in urban planning. One of the main challenge is to understand processes behind. Various studies highlight the usefulness of simulation tools in research focusing on land use change. Among simulation tools, Cellular Automata (CA) are well adapted with their geometric properties and potential to identify emerging spatial structures and processes. The transition rules definition is a key step of these CA-based simulations. Indeed, “in the context of urban systems, we often have no idea what the “right” rules are” (Torrens, 2011). In our approach “right rules” should be thematically interpretable rules …
Nitrogen Cascade At The Landscape Scale: Modelling The Effect Of Climate, Soils And Agriculture On Direct And Indirect Nitrogen Emissions In Contrasted Rural Sites,
2016
UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay
Nitrogen Cascade At The Landscape Scale: Modelling The Effect Of Climate, Soils And Agriculture On Direct And Indirect Nitrogen Emissions In Contrasted Rural Sites, Cyril Benhamou, Patrick Durand, Jordy Salmon-Monviola, Christophe Flechard, Sylvain Ferrant, Anne Probst, Josette Garnier, Gaëlle Tallec, Pierre Cellier, Laurène Casal, Juliette Anglade, Camille Chambon, Jean-Louis Drouet
International Congress on Environmental Modelling and Software
In rural landscapes the nitrogen cascade, i.e. the way reactive nitrogen transforms and transfers into, within and out of the agro-ecosystems depends on farm management, landscape structure and their interactions with soil types, topography, climate and hydrology. While NO3- emissions to water bodies are frequently measured and modeled at the catchment level, this is rarely the case for NH3 and N2O emissions. However on one hand NH3 emissions to the atmosphere in intensive livestock production areas may be of the same order of magnitude as NO3- emissions to water. On the other …
Assessing The Performance Of A Spatially Distributed Soil Erosion And Sediment Delivery Model For Han River Basin Of South Korea,
2016
Konkuk University
Assessing The Performance Of A Spatially Distributed Soil Erosion And Sediment Delivery Model For Han River Basin Of South Korea, Chung Gil Jung, Ji Wan Lee, So Ra Ahn, Seong Joon Kim
International Congress on Environmental Modelling and Software
When assessing the total sediment yield of a watershed through sediment transport from soil erosion process, the ratio of sediment delivery is a critical and uncertain factor during modelling. This study is to estimate watershed scale sediment yield with the evaluation of RUSLE (Revised Universal Soil Loss Equation) rain erosivity R factor for 15 years (2000 ~ 2014) using 1 minute data from 16 rainfall gauging stations in Han River basin (34,148 km2) of South Korea. The average R value in this study was evaluated as 4,708 MJ/ha mm/year with range of 1,652 ~ 10,143 MJ/ha mm/year while …
Hierarchical Hybrid Modelling,
2016
Delft University of Technology
Hierarchical Hybrid Modelling, Reza Hesan, Erik Pruyt
International Congress on Environmental Modelling and Software
Environmental systems are complex systems. They are composed of many heterogeneous agents interacting in nonlinear ways within environment. Consequently, capturing the dynamics and understanding these systems are often similarly complex. To understand complex systems, hierarchy theory proposes to decompose these systems to levels (vertical structures) and subsystems (horizontal structures). Hierarchical perspectives could help in understanding complex environmental systems. However, existing modeling platforms lack of an appropriate abstraction which supports hierarchical structuring of systems. Consequently, the application of hierarchy theory has been limited to observational purposes. In this paper, we present a hierarchical simulation platform and a software package developed to …
Comparing State-Of-The-Art Multi-Objective Evolutionary Algorithms For Water Allocation Under Different Climate Scenarios,
2016
Earth System Science, Wageningen University and Research Centre, Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research
Comparing State-Of-The-Art Multi-Objective Evolutionary Algorithms For Water Allocation Under Different Climate Scenarios, Dan Yan, Fulco Ludwig, He Qing Huang, Saskia E. Werners
International Congress on Environmental Modelling and Software
Water allocation is facing profound challenges due to increasing climate uncertainties. To deal with these uncertainties, we developed a modelling framework linking decision making on water allocation and multi-objective evolutionary search. The framework aims to assess how nine different multi-objective evolutionary algorithms (MOEAs) perform in identifying robust water allocation plans for large rivers. It was applied to the Pearl River basin in China to allocate sufficient flow into the delta to reduce salt intrusion in the dry season under current and future climate conditions. Results show all the MOEAs perform well in sustaining required discharge at two gauge stations from …
Identification Of Critical Source Areas Of Nutrient Loads Using Swat Model: Case Study, Zrebar Lake Watershed, Iran,
2016
Tarbiat Modares University
Identification Of Critical Source Areas Of Nutrient Loads Using Swat Model: Case Study, Zrebar Lake Watershed, Iran, S. Imani, M. Delavar, M. H. Niksokhan
International Congress on Environmental Modelling and Software
Entrance of nutrients and sediments to water bodies (i.e. Lakes) originating from watersheds is a serious problem in the Iran and other countries. So, the identification of critical source areas (CSAs) of pollutants in terms of watershed hydrologic units is extremely important for effective management of pollutant sources and implementation of best management practices for better protection of water quality. The main objective of this study was to identify and evaluate critical source areas (CSAs) of Nutrient loads using an integrated modeling approach. For this, Soil and Water Assessment Tool (SWAT) was used to identify CSAs of nutrients in the …
From Research Data To Web-Based Policy Tools: User-Centered Design Techniques In The Development Of The Agmip Impacts Explorer,
2016
Alterra, Wageningen UR
From Research Data To Web-Based Policy Tools: User-Centered Design Techniques In The Development Of The Agmip Impacts Explorer, Joske Houtkamp, Inge La Rivière, Hugo De Groot, Sander Janssen, Arjan De Jong
International Congress on Environmental Modelling and Software
decision making through a web-based tool is a complex challenge. Research projects are generally not designed to meet the information needs of specific stakeholder groups. Furthermore, tools developed in these projects are usually intended to disseminate research data on a wide scale, not to provide answers to specific questions of these stakeholders. User-centered design techniques can guide the development process of such tools, to enhance their usefulness and thus the applicability of the research outcomes for the intended audience. We applied techniques for user requirements analysis of the Impacts Explorer tool in the AgMIP research project, which models the impacts …
Escapade To Quantify Nitrogen Losses In Territories And Assess Mitigation And Adaptation Strategies,
2016
UMR ECOSYS, INRA, AgroParisTech, Université Paris-Saclay
Escapade To Quantify Nitrogen Losses In Territories And Assess Mitigation And Adaptation Strategies, Jean-Louis Drouet, François Laurent, Patrick Durand, Gilles Billen, Pierre Cellier, Olivier Maury, Stéphanie Potok, Philippe Faverdin, Christophe Fléchard, Josette Garnier, Armelle Guy, Catherine Hénault, Catherine Mignolet, Hervé Monod, Anne Probst, Stéphane Sorin, Gaëlle Tallec, Matthias Beekmann, Eric Ceschia, Cécile Le Gall, Thierry Morel, Gauthier Quesnel, Eric Ramat
International Congress on Environmental Modelling and Software
Agriculture is facing to the challenge of maintaining or even increasing production while limiting the use of nitrogen inputs. The introduction of mineral nitrogen in agroecosystems feeds a cascade of processes and losses to the environment at each stage of the cascade with many environmental and societal impacts (degradation of air, water and soil quality, impacts on greenhouse gas balance, biodiversity and human health…). Since classical approaches at plot or farm scale do not make possible to control all impacts, levers must also be sought at larger scales. The overall objective of the interdisciplinary project ESCAPADE (ANR-12-AGRO-0003, 2013-2017) is to …
