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Social And Policy Contexts For Environmental Modeling, Court Smith Jul 2006

Social And Policy Contexts For Environmental Modeling, Court Smith

International Congress on Environmental Modelling and Software

Modeling techniques and software can be an important part of the planning and policy processes associated with environmental decision making. Involving users, stakeholders, and clients is important for understanding and incorporating the social context associated with these decisions. Model developers have to understand the interaction of modeling with other social activities and agendas. Users, stakeholders, and clients are important for both generating information and building knowledge. The information and knowledge of users, stakeholders, and clients tends to be more local and specific. Models that broaden user perspectives can have important information generating and knowledge informing roles as well. Models can ...


Use Of Surface Analysis On Water Quality Model Outputs To Assess Tradeoff Of Nitrogen And Phosphorus Controls, P. Wang, L. C. Linker Jul 2006

Use Of Surface Analysis On Water Quality Model Outputs To Assess Tradeoff Of Nitrogen And Phosphorus Controls, P. Wang, L. C. Linker

International Congress on Environmental Modelling and Software

Low summer dissolved oxygen (DO) in the Chesapeake Bay is primarily due to excessive nitrogen (N) and phosphorus (P) inputs. These nutrients cause algal blooms in the spring and summer with subsequent algal decay leading to summer oxygen depletion. In the Chesapeake Bay, N and P are generally higher than their half saturation constants for algal growth. Controlling both N and P loads are necessary due to spatial and temporal shift in nutrient limitation. Based on a set of water quality model runs, we used a surface analysis technique to establish a function of DO versus N and P loads ...


Managing For Visual Goals In The Ned-2 Decision Support System For Forests Ecosystems., Donald Nute, Mark Twery, Zhiyuan Cheng, Arlo Lyle, Cy Routh Jul 2006

Managing For Visual Goals In The Ned-2 Decision Support System For Forests Ecosystems., Donald Nute, Mark Twery, Zhiyuan Cheng, Arlo Lyle, Cy Routh

International Congress on Environmental Modelling and Software

NED-2 integrates decision support tools for forested ecosystems developed by the NED-2 team with other third-party decision support tools. NED-2 is goal-driven and is designed to help manage for visual, wildlife, and ecological as well as traditional timber goals. Several tools are included to help manage for visual goals. (1) A knowledge based system can perform analysis of visual goals for the management unit. (2) A report generator incorporates the results of the visual goal analysis into detailed reports in HTML format. (3) If a shape file for the management unit is available, the results can also be displayed using ...


Water Resources Management And Water Availability In The Elbe River Basin Under Conditions Of Global Change, S. Kaden, M. Kaltofen, H. Koch Jul 2006

Water Resources Management And Water Availability In The Elbe River Basin Under Conditions Of Global Change, S. Kaden, M. Kaltofen, H. Koch

International Congress on Environmental Modelling and Software

Global change challenges long-term planning in water management. Practical management requires plausible and consistent scenarios as well as assessments of possible climatic, technological and social developments and their impacts. These problems are subjects of research within the GLOWA Elbe II – project. The project’s goal is to develop a water management strategy for possible adaptation to global change in the Elbe river basin (about 150,000 km2). One important component of the multi-disciplinary project is the analysis of conflicts related to water availability. For that purpose a detailed water management model for the whole Elbe river basin, including the Czech ...


Problems And Solutions In Up- And Down-Scaling In Environmental Modelling For The Policy Scale, Ulrich Leopold, Peter Finke, Reimund Roetter Jul 2006

Problems And Solutions In Up- And Down-Scaling In Environmental Modelling For The Policy Scale, Ulrich Leopold, Peter Finke, Reimund Roetter

International Congress on Environmental Modelling and Software

Environmental models are mostly developed to study processes at a certain scale. They are increasingly applied for analyses to support decision making of policy makers on natural resource and environmental risk management. Usually the policy scale differs from the scale the models are developed for as processes have to be taken into account occurring at various scales. In addition, many models were developed for research purposes rather than for policy support. As a consequence, several models are often combined into model chains to arrive at estimates for the policy scale, each sub-model describing a sub set of processes and only ...


Integrating 3d Hydrodynamic Transport And Ecological Plant Models Of The Savannah River Estuary Using Artificial Neural Network Models, Edwin Roehl, Ruby Daamen, Paul A. Conrads, Wiley Kitchens Jul 2006

Integrating 3d Hydrodynamic Transport And Ecological Plant Models Of The Savannah River Estuary Using Artificial Neural Network Models, Edwin Roehl, Ruby Daamen, Paul A. Conrads, Wiley Kitchens

International Congress on Environmental Modelling and Software

The Savannah Harbor is one of the busiest ports on the East Coast of the USA and is located just downstream of the Savannah National Wildlife Refuge (SNWR), which is one of the nation’s largest freshwater tidal marshes. The Lower Savannah River estuary has been studied for years by governmental agencies, water users, universities, and consultants having an interest in controlling water quality and predicting the potential impacts of a proposed harbor deepening. Consequently, many different databases have been created that describe the natural system’s complexity and behaviors. Variables having particular relevance include those describing bathymetry, meteorology, water ...


Multi-Scale Analysis And Modelling Of Natural Resource Management Options, Frank Ewert, Herman Van Keulen, Martin Van Ittersum, Ken Giller, Peter Leffelaar Jul 2006

Multi-Scale Analysis And Modelling Of Natural Resource Management Options, Frank Ewert, Herman Van Keulen, Martin Van Ittersum, Ken Giller, Peter Leffelaar

International Congress on Environmental Modelling and Software

Problems related to natural resource management (NRM) are typically complex and require integration of information across several scales and disciplines. Operational concepts to support such integration are scarce. Systems analysis and modelling can be helpful but the complexity of environmental systems also requires application of appropriate upscaling methods. Simultaneous assessment and modelling of system behaviour at several levels of organisation poses particular problems. Here, we provide an introductory overview on the critical issues related to multi-scale analysis and modelling of NRM. We describe the problems related to NRM within the context of systems thinking and hierarchy theory. Methods of upscaling ...


Modelling Support To Improve The Quality Of Environmental Studies, Huub Scholten Jul 2006

Modelling Support To Improve The Quality Of Environmental Studies, Huub Scholten

International Congress on Environmental Modelling and Software

Sound decisions in environmental management are often based on modelling, performed by teams consisting of team members with multidisciplinary backgrounds and solving multidisciplinary problems. Modelling in itself is a risky activity, in which many things can go wrong, including miscommunication within the team and between the team and the problem owner, malpractice, lack of process knowledge and a lack of documentation. This kind of problems makes modelling an obscure and arbitrary practice. The multidisciplinary character enhances the problem-solving scope of model studies, but does further increase the problems. Projects that use methods and tools for multidisciplinary model-based problem solving should ...


Deriving A Spatially-Explicit Hillslope Sediment Delivery Ratio Model Based On The Travel Time Of Water Across A Hillslope, D. A. Post, A. E. Kinsey-Henderson, R. Bartley, A. Hawdon Jul 2006

Deriving A Spatially-Explicit Hillslope Sediment Delivery Ratio Model Based On The Travel Time Of Water Across A Hillslope, D. A. Post, A. E. Kinsey-Henderson, R. Bartley, A. Hawdon

International Congress on Environmental Modelling and Software

To derive a sediment budget at the catchment scale, sediment transport models such as SedNet typically require an estimate to be made of the input of sediment to each stream link for each defined sub-catchment. This requires an estimate of both the erosion and delivery of sediment from every pixel within each sub-catchment. The total erosion within each pixel is calculated using the Universal Soil Loss Equation (USLE), while the delivery of sediment from that pixel to the nearest stream is based on a hillslope delivery ratio (HSDR). At large scales (250 m), a constant HSDR is typically used, however ...


Towards A User-Oriented Design Of A Dss For Integrated River-Basin Management: The Elbe Dss Prototype, Jean-Luc De Kok, Sebastian Kofalk Jul 2006

Towards A User-Oriented Design Of A Dss For Integrated River-Basin Management: The Elbe Dss Prototype, Jean-Luc De Kok, Sebastian Kofalk

International Congress on Environmental Modelling and Software

The problems faced in the German part of the Elbe catchment range from poor navigation conditions and flooding vulnerability to a need for nature restoration in the floodplains. A variety of river engineering works such as large-scale dike shifting, channel dredging, and large-scale retention are in a planning or implementation stage. Usually the initiative for such measures is taken from a local or sectoral point of view. Therefore, it is not always clear how different measures will interact with each other, nor how their effects influence the natural conditions in the floodplains. In order to examine different strategies for sustainable ...


Generic Simulation Models For Facilitating Stakeholder Involvement In Water Resources Planning And Management, Daniel P. Loucks Jul 2006

Generic Simulation Models For Facilitating Stakeholder Involvement In Water Resources Planning And Management, Daniel P. Loucks

International Congress on Environmental Modelling and Software

The models discussed in this workshop have many features in common, and some that differ. All are what we commonly call decision support systems for analyzing alternative water, and, in some cases, watershed management alternatives. All are interactive, i.e., they use graphic interfaces and are menu driven. After some training interested stakeholders can explore questions and assumptions using these tools. Each model is designed to be flexible enough to fit most if not all water resource systems no matter where located. Each is a tool that can be used, at least as a first step, in the identification and ...


A Novel Method To Estimate The Model Uncertainty Based On The Model Errors, Durga Lal Shrestha, Dimitri P. Solomatine Jul 2006

A Novel Method To Estimate The Model Uncertainty Based On The Model Errors, Durga Lal Shrestha, Dimitri P. Solomatine

International Congress on Environmental Modelling and Software

This paper presents a novel method for estimating “total” predictive uncertainty using machinelearning techniques. By the term “total” we mean that all sources of uncertainty are taken into account, includingthat of the input and observed data, model parameters and structure, without attempting to separate thecontribution given by these different sources. We assume that the model error, which is mismatch between theobserved and modelled value reflects all sources of uncertainty. Fuzzy c-means clustering was employed tocluster the input space into different zones or clusters assuming that the all the examples those belong to theparticular cluster have similar model errors. The prediction ...


Development Of A National, Landuse-Based Water Balance Model For Australia, Wendy D. Welsh, D. G. Barratt, K. Ranatunga, L. A. Randall Jul 2006

Development Of A National, Landuse-Based Water Balance Model For Australia, Wendy D. Welsh, D. G. Barratt, K. Ranatunga, L. A. Randall

International Congress on Environmental Modelling and Software

Australia currently has no nation-wide comprehensive and consistent information on the spatial and temporal relationships between rainfall, evapotranspiration, drainage to groundwater and runoff to rivers. To estimate this information a simple modelling approach utilising existing data was sought. A review of existing models and their data requirements led to the development of a steady state Geographic Information System (GIS) based method driven by long-term average climate data and high resolution land cover and land use data. Mean annual and mean monthly runoff, evapotranspiration and drainage were modelled. Runoff results were evaluated against other published values where available and found to ...


Watershed Health Assessment Tools-Investigating Fisheries (What-If): A Modeling Toolkit For Watershed And Fisheries Management., Brenda Rashleigh, Craig Barber, Mike Cyterski, John Johnston, Yusuf Mohamoud, Rajbir Parmar Jul 2006

Watershed Health Assessment Tools-Investigating Fisheries (What-If): A Modeling Toolkit For Watershed And Fisheries Management., Brenda Rashleigh, Craig Barber, Mike Cyterski, John Johnston, Yusuf Mohamoud, Rajbir Parmar

International Congress on Environmental Modelling and Software

The Watershed Health Assessment Tools-Investigating Fisheries (WHAT-IF) is a decision-analysis modeling toolkit for personal computers that supports watershed and fisheries management. The WHAT-IF toolkit includes a relational database, help-system functions and documentation, and multiple statistical and simulation modeling tools. The tools consist of a hydrologic and stream geometry calculator, a fish assemblage predictor, a fish habitat suitability calculator, and a process-based model to predict biomass dynamics of stream biota (the BASS model). The tools can be used to assess conditions and associated stressors in aquatic ecosystems, to examine causes of impairment, and to forecast ecological outcomes of habitat alterations and ...


Features Of Advanced Decision Support Systems For Environmental Studies, Management, And Regulation, Edwin Roehl, Ruby Daamen, Paul A. Conrads Jul 2006

Features Of Advanced Decision Support Systems For Environmental Studies, Management, And Regulation, Edwin Roehl, Ruby Daamen, Paul A. Conrads

International Congress on Environmental Modelling and Software

Natural resource managers and users face difficult challenges when managing the interactions between natural and man-made systems. Even though the collective interests and computer skills of the community of managers, scientists, and other stakeholders are quite varied, there is an overarching need for equal access by all to the scientific knowledge needed to make the best possible decisions. A decision support system (DSS) can meet this need. DSS have been described as, “computer-based systems (for) helping decision-makers to solve various semi structured and unstructured problems involving multiple attributes, objectives, and goals… Historically, the majority of DSSs have been either computer ...


Using The Monte Carlo Method To Quantify Uncertainty In Predictions Of A Soil Carbon Cycle Model In Balsam Fir (Abies Balsamea (L.) Mill.) And Black Spruce (Picea Mariana (Mill.) B.S.P.) Forest Ecosystems In The Boreal Forest, G. R. Larocque, D. Paré, R. Boutin, V. Lacerte Jul 2006

Using The Monte Carlo Method To Quantify Uncertainty In Predictions Of A Soil Carbon Cycle Model In Balsam Fir (Abies Balsamea (L.) Mill.) And Black Spruce (Picea Mariana (Mill.) B.S.P.) Forest Ecosystems In The Boreal Forest, G. R. Larocque, D. Paré, R. Boutin, V. Lacerte

International Congress on Environmental Modelling and Software

The majority of process-based models of thecarbon cycle in forest ecosystems aredeterministic. Very few components have beenimplemented in these models to represent theuncertainty that may result from natural variation,model structure and parameter estimates. Thereare many sources of natural variation in thecarbon cycle of forest ecosystems. The mainsources of variation occur in the soil organicmatter (SOM) in terms of quantity and quality,both of which vary according to vegetation type,climatic conditions, soil characteristics (textureand structure) and carbon fluxes. For instance, thelitterfall rate and periodicity influencesignificantly the carbon input in the soil organicand mineral horizons. The litter carbon andnutrient contents ...


Systematic Simplification Of Mechanistic Models, Neil Crout, Glen Cox, James Gibbons Jul 2006

Systematic Simplification Of Mechanistic Models, Neil Crout, Glen Cox, James Gibbons

International Congress on Environmental Modelling and Software

Models of environmental systems are often complex, reflecting the complexity of the systems they try and describe. This complexity is difficult to manage and, especially in the face of limited observed data, there is a risk that models become over-parameterised with the result that predictions are less reliable than they need be. An approach to investigating the influence of model complexity on prediction accuracy is to compare the performance of alternative (simpler) model formulations. However this is difficult to achieve in practice as the process of simplification can be time-consuming with the consequence that only a few alternative formulations can ...


Predicting Impacts Of Water Management In Coastal Zones By Hydraulic And Salinity Modeling, C. T. Hoanh, N. D. Phong, J. W. Gowing, T. P. Tuong, N. X. Hien, N. D. Dat Jul 2006

Predicting Impacts Of Water Management In Coastal Zones By Hydraulic And Salinity Modeling, C. T. Hoanh, N. D. Phong, J. W. Gowing, T. P. Tuong, N. X. Hien, N. D. Dat

International Congress on Environmental Modelling and Software

Tidal effects and salinity intrusion are two defining characteristics of coastal zones. The firstcauses complex variations of water level and unsteady flows in the river and canal network. The second is aconstraint to agriculture and freshwater fishery, but provides suitable conditions for brackish wateraquaculture. These phenomena bring about conflicts in the development of agriculture, fishery andaquaculture due to different requirements of water quality. Hydraulic and salinity modeling have beendeveloped and applied to simulate tidal propagation and salinity intrusion, and to analyze the effects of watermanagement on hydrological and salinity conditions that control land use in the coastal zones. This paperpresents ...


Experience With A System Dynamics Model In A Prospective Study On The Future Impact Of Ict On Environmental Sustainability, Patrick A. Wäger, Lorenz M. Hilty, Peter Arnfalk, Lorenz Erdmann, James Goodman Jul 2006

Experience With A System Dynamics Model In A Prospective Study On The Future Impact Of Ict On Environmental Sustainability, Patrick A. Wäger, Lorenz M. Hilty, Peter Arnfalk, Lorenz Erdmann, James Goodman

International Congress on Environmental Modelling and Software

To assess the potential impact of ICT on environmental sustainability in the European Union within a time horizon until 2020, we developed a System Dynamics model. In our contribution we make a critical, retrospective evaluation of the model with regard to the requirements and expectations of the project commissioners and of experts involved in the modeling and simulation process. The issues addressed are problem adequacy, validity, transparency, communicability and receptivity of the model. We conclude that modeling approaches that better support a modular model design than System Dynamics does would lead to better results regarding these requirements, and that a ...


Jams – A Framework For Natural Resource Model Development And Application, Sven Kralisch, Peter Krause Jul 2006

Jams – A Framework For Natural Resource Model Development And Application, Sven Kralisch, Peter Krause

International Congress on Environmental Modelling and Software

Current challenges in sustainable management of water resources have created demand for integrated, flexible and easy to use hydrological models which are able to simulate the quantitative and qualitative aspects of the hydrological cycle with a sufficient degree of certainty. Existing models which have been developed to fit these needs are often constrained to specific scales or purposes and thus can not be easily adapted to meet different challenges. As a consequence resulting from this shortage a number of modelling frameworks have been developed, e.g. the ObjectModelling System (OMS). In order to enhance the capabilities of OMS towards special ...


Interleaving Growth And Regeneration Models In The Ned-2 Decision Support System For Forest Ecosystems., Donald Nute, Mark Twery, Julian Bishop, Zhiyuan Cheng, David Bucugnani, Walter D. Potter, David Loftis, Scott Thomasma, Peter Knopp Jul 2006

Interleaving Growth And Regeneration Models In The Ned-2 Decision Support System For Forest Ecosystems., Donald Nute, Mark Twery, Julian Bishop, Zhiyuan Cheng, David Bucugnani, Walter D. Potter, David Loftis, Scott Thomasma, Peter Knopp

International Congress on Environmental Modelling and Software

NED-2 is a goal-driven system designed to help manage timber, wildlife, visual, and ecological goals for a forested ecosystem. The basic approach of the decision process modeled by NED-2 is to develop alternative management plans for the stands in a management unit, to simulate these plans over time, and then to analyze the results of the simulation to see how well the management goals are achieved by the alternative plans. The basic simulation tool used in the system is the USDA Forest Service Forest Vegetation Simulator (FVS.) FVS provides a regeneration component, but a need was recognized for making available ...


An Agent-Based Simulation Tool For Modelling Sustainable Logistics Systems, Nicolas Knaak, Sven Kruse, Bernd Page Jul 2006

An Agent-Based Simulation Tool For Modelling Sustainable Logistics Systems, Nicolas Knaak, Sven Kruse, Bernd Page

International Congress on Environmental Modelling and Software

Courier services form an important sector of urban freight traffic; leading to a daily volume of traffic that isproblematic in economic and ecologic respects. New logistic concepts for reducing costs, distances and emissionscould improve this situation by increased application of bicycle couriers and bundling of consignments.In this paper we summarise our previous work on the multi-agent-based simulation of alternative logistic conceptsfor city courier services. We discuss models of different organisation forms as well as the tools appliedto their analysis. Since the logistic strategies analysed so far could not display the expected economic andecologic benefits, a new concept named Fixed ...


Incorporating Qualitative Indicators To Support River Managers; Application Of Fuzzy Sets, J. A. E. B. Janssen, Jean-Luc De Kok, A. Y. Hoekstra, R. M. J. Schielen Jul 2006

Incorporating Qualitative Indicators To Support River Managers; Application Of Fuzzy Sets, J. A. E. B. Janssen, Jean-Luc De Kok, A. Y. Hoekstra, R. M. J. Schielen

International Congress on Environmental Modelling and Software

In evaluation of river management strategies it is generally difficult to deal with the loosely structured and uncertain information at hand. Due to the increasing number of interests and objectives involved in river management it becomes more important to find a way to deal with such information. This paper explores to what extent fuzzy set theory can help in the modelling of relations between river management measures and their effects. The authors conclude that fuzzy logic can provide a valuable contribution because of the relative transparency of the method, the possibility to include qualitative knowledge and the incorporation of uncertainty ...


Evaluation Of A Physically Based Distributed Hydrological Model, Btopmc, For Different Physiographic Zones Of Nepal, K. N. Dulal, S. Shrestha, K. Takeuchi, H. Ishidaira Jul 2006

Evaluation Of A Physically Based Distributed Hydrological Model, Btopmc, For Different Physiographic Zones Of Nepal, K. N. Dulal, S. Shrestha, K. Takeuchi, H. Ishidaira

International Congress on Environmental Modelling and Software

Many rivers in Nepal are ungauged and there is an urgent need to develop a model for those ungauged basins in order to properly use the vast natural resources of Nepal. The aim of this study is to evaluate the performance of the distributed hydrological model, BTOPMC (Block-wise use of TOPMODEL with Muskingum-Cunge method) for different physiographic zones of Nepal and then to develop a regional model, which can be used for prediction in ungauged basins. It is advantageous to use BTOPMC for poorly gauged or ungauged basins as it utilizes various global datasets available in public domain. In this ...


Non-Linear, Multivariate Forecasting Of Hydrologic And Anthropogenic Responses To Meteorological Forcing, Edwin Roehl, Terry Murray Jul 2006

Non-Linear, Multivariate Forecasting Of Hydrologic And Anthropogenic Responses To Meteorological Forcing, Edwin Roehl, Terry Murray

International Congress on Environmental Modelling and Software

Managers and users of natural resources often face two challenging problems. One is forecasting future natural system conditions for optimal resource allocation. Here, the natural system is comprised of the weather and a dependant hydrologic system that contains a water resource. The second problem is forecasting the behavior of a combined natural and man-made system, which also includes anthropogenic resource consumers. Even though detailed meteorological forecasting over weeks and months is impractical, hydrologic behaviors such as groundwater cycling can transpire over months and years. Alternatively, man-made systems exhibit behaviors that both lag and lead causal forcing, e.g., seasonal weather ...


Rank-Equivalence Method For Sensitivity Analysis Of An Integrated Model Of A River Catchment, J. K. Ravalico, Graeme C. Dandy, Holger R. Maier Jul 2006

Rank-Equivalence Method For Sensitivity Analysis Of An Integrated Model Of A River Catchment, J. K. Ravalico, Graeme C. Dandy, Holger R. Maier

International Congress on Environmental Modelling and Software

Integrated Assessment Modelling (IAM) incorporates knowledge from different disciplines to provide an overarching assessment of the impact of different management decisions. Integrated models generally require numerous parameters from varying sources, many not known with certainty. Rapid increases in model size and complexity, particularly in the case of integrated models for decision-making, pose new challenges for effective sensitivity analysis. Some of the identified shortcomings of existing sensitivity analysis methods in the context of IAM include: computational inefficiency, failure to assess parameter interactions, excessive data requirements (e.g. requiring parameter probability distributions), assumptions of model linearity and monotonicity and, in particular, difficulty ...


Model-Based Identification And Scaling Indicators Of Landscape Processes: State-Of-The-Art And Problem-Oriented Solutions, Martin Volk, K. Schulz, Ralf Seppelt, Sven Lautenbach Jul 2006

Model-Based Identification And Scaling Indicators Of Landscape Processes: State-Of-The-Art And Problem-Oriented Solutions, Martin Volk, K. Schulz, Ralf Seppelt, Sven Lautenbach

International Congress on Environmental Modelling and Software

The ability to transfer processes, local conditions and assessment methods between different spatial scales plays an important role in various fields of environmental sciences and planning practice. Besides a fundamental lack of general scaling theories different approaches are currently used and investigated. First, local scale process understanding is simply used at larger scales and spatial explicit information are derived by suitable indicators or transfer functions. In order to represent small scale spatial variability at larger scales sophisticated aggregation methods have been developed, but due to very restrictive assumptions, have only successfully been applied in very few areas (e.g. groundwater ...


Spatial Estimations Of Air Pollution In Urban Areas By Lidar Measurements, L. Matejicek Jul 2006

Spatial Estimations Of Air Pollution In Urban Areas By Lidar Measurements, L. Matejicek

International Congress on Environmental Modelling and Software

Spatial analysis and visualization of data focused on air pollution in urban areas can be more efficiently explored by geographic information systems (GISs). Data originating from direct monitoring, mathematical modelling and physical simulation in wind tunnels are represented by a wide range of data formats that, together with spatial objects on the surface of studied areas, form heterogenic structures. Thus, to solve spatio-temporal analysis and numeric models, a complex computer system is needed to manage the data and a number of user oriented procedures. In the case of this contribution, a GIS project is developed to examine the GIS abilities ...


Environmental Cartographic Models For The Region Of Bregare Paleoseismic Phenomena, Moesian Platform (Bulgaria), Dora Angelova Jul 2006

Environmental Cartographic Models For The Region Of Bregare Paleoseismic Phenomena, Moesian Platform (Bulgaria), Dora Angelova

International Congress on Environmental Modelling and Software

The Bregare dislocation was a result of the impulse event a block was torn away. The anomalous relief deformations and tectonic discordance of greatest intensity provide evidence that the paleoearthquakes took place at the Pliocene-Quaternary boundary, between the Pleistocene, Pleistocene-Holocene boundary and the Holocene. It exerted impact on the terrain around the Oryahovitsa and Bregare villages and disturbed the highly raised Neogene base in the range of the Iskar River flood terrace. The paleoearthquakes were catastrophic and disturbed the watersheds and the river terraces, changed the directions of river runoff, caused the subsidence and destruction of karst caverns, etc. Secondary ...


Challenges Encountered During Integrated Modelling Across Multiple Catchments, Neville D. Crossman, Brett A. Bryan Jul 2006

Challenges Encountered During Integrated Modelling Across Multiple Catchments, Neville D. Crossman, Brett A. Bryan

International Congress on Environmental Modelling and Software

There has been a recent trend in natural resource management decision making toward target setting and the use of models to identify geographic priorities to meet those targets. However, measurable and quantitative targets for assessing progress toward achieving management and policy goals tend not to be established. This may be due in large part to a lack of clarity in data and model availability, and geographic prioritisation processes. The long history of extensive human activity and modification of natural resources in the Murray Darling Basin of southern Australia has led to a myriad of natural resource management problems, particularly dryland ...