Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Brigham Young University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 2131 - 2160 of 3778

Full-Text Articles in Entire DC Network

From Landscape-Scale Models Of Forest Biodiversity Change Towards An Integrated Planning Tool – A Gui For Building Empirical Ecological Extrapolation Models Based On Land Cover Data –, Tobias Lung, Gertrud Schaab Jul 2010

From Landscape-Scale Models Of Forest Biodiversity Change Towards An Integrated Planning Tool – A Gui For Building Empirical Ecological Extrapolation Models Based On Land Cover Data –, Tobias Lung, Gertrud Schaab

International Congress on Environmental Modelling and Software

Spatially explicit models linking biological field data with remotely-sensed landcover data have become commonplace for landscape-scale biodiversity assessments, butthey usually neither consider time series data nor include future scenarios. Extrapolationmodels addressing these deficiencies for three keystone species/groups of the Kakamega-Nandi forests in western Kenya proved to be a suitable means for investigating the effectsof long-term land change processes on the development of forest biodiversity in space andtime. However, the experimental modelling design of the approaches is not consideredconvenient for a more comprehensive, interlinked assessment including morespecies/groups and also ecosystem functions and services, nor is it adequate for a stronglocal stakeholder …

Go to article

Modelling Urban Land Use Change Using Geographically Weighted Regression And The Implications For Sustainable Environmental Planning, Noresah Mohd Shariff, Sanjay Gairola, Anita Talib Jul 2010

Modelling Urban Land Use Change Using Geographically Weighted Regression And The Implications For Sustainable Environmental Planning, Noresah Mohd Shariff, Sanjay Gairola, Anita Talib

International Congress on Environmental Modelling and Software

In this study we applied Geographically Weighted Regression (GWR) approach to model urban landuse changes in Penang Island from 1990 to 2005, covering the period during which the Island has experiencedtremendous urban growth due to in migration from adjacent areas. Land use change has potential impacts on thephysical and social environment. We identified spatial variables describing environment, physical and socioeconomicfactors which are hypothesized to influence the change in the land use in the study area. An ordinaryleast squares regression (OLS) model is applied to the variables followed by a GWR model and the results arecompared. The results show that the …

Go to article

Letsmap Do Brasil - A Web-Based Planning Support Tool For Sediment Management In Western Central Brazil, Lorz Carsten, Fürst Christine, Pietzsch Katrin, Makeschin Franz Jul 2010

Letsmap Do Brasil - A Web-Based Planning Support Tool For Sediment Management In Western Central Brazil, Lorz Carsten, Fürst Christine, Pietzsch Katrin, Makeschin Franz

International Congress on Environmental Modelling and Software

A central element of a sediment management plan for the Federal District ofBrasília, Western Central Brazil is a planning support tool that enables the user to test theeffects of land use changes on landscape processes and functions (LPF). In this paper, wepresent the web based tool Letsmap do Brasil. The tool has two principal interacting levels.The upper level contains information on effects of land use on LPF, i.e. runoff control,sediment retention, nitrogen availability, and agronomic value. The parameterized relationbetween land use and LPF is the core of the system. For each LPF a value specific to landuse has been assigned. …

Go to article

A New Tool For Integrated And Interactive Sustainability Impact Assessment Of Urban Land Use Changes: The Plurel Iiat, Dagmar Haase, Annette Piorr, Nina Schwarz, Ingo Zasada Jul 2010

A New Tool For Integrated And Interactive Sustainability Impact Assessment Of Urban Land Use Changes: The Plurel Iiat, Dagmar Haase, Annette Piorr, Nina Schwarz, Ingo Zasada

International Congress on Environmental Modelling and Software

The new integrated Impact Analysis Tool (iIAT) synthesises the modelling results from the impact analysis of land use changes of the EU-project PLUREL on periurban land use relationships and the effects of peri-urban land use change; www.plurel.net) into one stand-alone tool. It facilitates the integration of manifold aspects of problems of land use (change) and its functions and services related to urbanisation. It further considers conflicts of interest of different stakeholders such as residents, planners or developers within a planning process. The iIAT covers all dimensions of sustainability, namely the economic, the social and the environmental. Based on land use …

Go to article

Remote Sensing Time Series For Modeling Invasive Species Distribution: A Case Study Of Tamarix Spp. In The Us And Mexico, Anna F. Cord, Doris Klein, Stefan Dech Jul 2010

Remote Sensing Time Series For Modeling Invasive Species Distribution: A Case Study Of Tamarix Spp. In The Us And Mexico, Anna F. Cord, Doris Klein, Stefan Dech

International Congress on Environmental Modelling and Software

Detecting invasive species and predicting their potential distribution are crucial to coordinate management responses. Remote sensing data are now available in several spatial and temporal resolutions and can supply environmental models with additional information. This study uses the Maximum Entropy algorithm to model the current distribution of the saltcedar (Tamarix spp.) in the US and Mexico and to identify suitable habitats, both already inhabited and not yet occupied. Tamarisk is restricted to specific habitats such as riparian zones, wetlands and agricultural or disturbed areas, which are typically not only characterized by climate. To describe vegetation phenology and thermal seasonality in …

Go to article

Application Of Life Cycle Analysis (Lca) In Evaluating Energy-Consuming Of Integrated Oxidation Ditch (Iod), Xianchun Tan, Junyi Xu, Sheng Wang, C. Y. Miao Jul 2010

Application Of Life Cycle Analysis (Lca) In Evaluating Energy-Consuming Of Integrated Oxidation Ditch (Iod), Xianchun Tan, Junyi Xu, Sheng Wang, C. Y. Miao

International Congress on Environmental Modelling and Software

With the research on some critical technology going deeply, the problem of technology route and project approach for the saving energy and reducing consumption have become the focus of municipal wastewater treatment process. In this article, LCA (Life Cycle Analysis) is applied to identify and compare the energy consumption of each stage of different technologies in municipal wastewater treatment from the view of whole process. This is carried out after reviewing the condition of energy utilizing of typical technologies in China. And some measures are brought forward to improve the efficiency of energy utilizing. Integrated Oxidation Ditch (IOD) is taken …

Go to article

Land Use Change Modelling In An Urban Region With Simultaneous Population Growth And Shrinkage Including Planning And Governance Feedbacks, Dagmar Haase Jul 2010

Land Use Change Modelling In An Urban Region With Simultaneous Population Growth And Shrinkage Including Planning And Governance Feedbacks, Dagmar Haase

International Congress on Environmental Modelling and Software

In the EU-project PLUREL we develop scenarios for future land use development in European urban regions facing population growth or shrinkage. We combine the spatially explicit modelling work with a participatory approach to involve stakeholder knowledge on drivers and policy instruments to steer land use development. Our scenario technique aims at incorporating feedbacks from planning into land use modelling. For modelling land use futures and options of the urban region of Leipzig- Halle, Germany, the MOLAND cellular automata model was used. To integrate stakeholder knowledge into the functionality of MOLAND and, so doing, to develop locally adapted land use storylines …

Go to article

Evaluating The Impact Of Climate Change On Global Hpai H5n1 Outbreaks, Zhijie Zhang, Dongmei Chen, Wenbao Liu, Lei Wang Jul 2010

Evaluating The Impact Of Climate Change On Global Hpai H5n1 Outbreaks, Zhijie Zhang, Dongmei Chen, Wenbao Liu, Lei Wang

International Congress on Environmental Modelling and Software

Highly pathogenic avian influenza viruses H5N1 have spread throughout Asia, Europe, and Africa in the past decade, raising serious worldwide concerns about a potential new pandemic. Many studies have investigated the spread of the HPAI H5N1 virus and discussed its possible risk factors. However, the climate factor, which can affect the whole process of H5N1 outbreaks, has been greatly ignored. The objective of this preliminary study is to use a GIS-based approach to explore the potential impacts of temperature change on H5N1 outbreaks. We have divided the outbreaks into five epidemic waves. Although the temperature ranges of different epidemic waves …

Go to article

Exploring The Choice Of Decision Making Method In An Agent Based Model Of Land Use Change, A. R. Cabrera, P. J. Deadman, E. S. Brondizio, M. Pinedo-Vasquez Jul 2010

Exploring The Choice Of Decision Making Method In An Agent Based Model Of Land Use Change, A. R. Cabrera, P. J. Deadman, E. S. Brondizio, M. Pinedo-Vasquez

International Congress on Environmental Modelling and Software

In agent-based models of land use/cover change (ABM/LUCC), small changes in micro-level decision-making methods used by agents may significantly affect macro-level outcomes. Yet, the implications of choosing a specific decision making model are seldom explored in ABM/LUCC studies. This paper discusses an ABM/LUCC modelling study of smallholder farming households in the Amazonian varzea in Maraj´o Island, Brazil. These agents represent the 21 households within the community of Paricatuba. Farmers in this community cultivate acai as a primary source of income, in addition to other farming and economic activities such as offsite employment. In the model, agents make annual decisions to …

Go to article

The Northern-Global Climate Change Adaptation Dialogue, J. I. Maclellan Jul 2010

The Northern-Global Climate Change Adaptation Dialogue, J. I. Maclellan

International Congress on Environmental Modelling and Software

Although climate change adaptation can occur over various political, social, and institutionalscales, the majority of adaptation decisions take place at the local level where an intimate understanding ofthe particularities of local circumstances (i.e. successful responses to past extremes events) exist alongsidea lack of formalised expertise in projecting and analyzing future possibilities. The relationship between theexperts who produce counterfactual knowledge, and the individuals who apply it, is thus central to thechallenge of responding to climate change successfully. I present a deliberately polarized caricature of thisrelationship in an attempt to facilitate knowledge exchange (i.e. to identify barriers to knowledgeexchange). Through bibliometric analysis …

Go to article

Comparison Of Climate Change Impacts And Development Effects On Future Mekong Flow Regime, C. T. Hoanh, Kittipong Jirayoot, Guillaume Lacombe, Vithet Srinetr Jul 2010

Comparison Of Climate Change Impacts And Development Effects On Future Mekong Flow Regime, C. T. Hoanh, Kittipong Jirayoot, Guillaume Lacombe, Vithet Srinetr

International Congress on Environmental Modelling and Software

A framework of climate change (CC) analysis is developed using the Decision Support Framework models of the Mekong River Commission (SWAT hydrological, IQQM basin simulation and hydrodynamic iSIS models) to analyze impacts of CC and water resources development on Mekong flow regime. This analysis is based on six model run scenarios defined as combinations of a development scenario, either baseline or 20-year plan and a climate dataset, either observed or from regional downscaling model simulating the past in 1985-2000 or projecting the future climate in 2010-2050. The projected climate shows a slight increase in precipitation throughout the Mekong basin except …

Go to article

Letsmap Do Brasil - A Web-Based Planning Support Tool For Sediment Management In Western Central Brazil, Lorz Carsten, Fürst Christine, Pietzsch Katrin, Makeschin Franz Jul 2010

Letsmap Do Brasil - A Web-Based Planning Support Tool For Sediment Management In Western Central Brazil, Lorz Carsten, Fürst Christine, Pietzsch Katrin, Makeschin Franz

International Congress on Environmental Modelling and Software

A central element of a sediment management plan for the Federal District ofBrasília, Western Central Brazil is a planning support tool that enables the user to test theeffects of land use changes on landscape processes and functions (LPF). In this paper, wepresent the web based tool Letsmap do Brasil. The tool has two principal interacting levels.The upper level contains information on effects of land use on LPF, i.e. runoff control,sediment retention, nitrogen availability, and agronomic value. The parameterized relationbetween land use and LPF is the core of the system. For each LPF a value specific to landuse has been assigned. …

Go to article

Modelling Human Health By Levels Of Biological Organization, Wilfred R. Cuff, Clifford Clark, Paulette Richard, Venkata R S K Duvvuri Jul 2010

Modelling Human Health By Levels Of Biological Organization, Wilfred R. Cuff, Clifford Clark, Paulette Richard, Venkata R S K Duvvuri

International Congress on Environmental Modelling and Software

The hierarchy of levels in the organization of matter, or the “hierarchy of life”, is a fundamentalconcept in biology, and biologists are used to thinking about their work asbeing at a particular level. Yet medicine, in both research and application, operatessomewhat independently of this concept, working almost exclusively at levels at or belowthe individual. Through the relatively-recent expansion of epidemiology, medicinedoes reach up to the level of the population - but medicine at higher levels of biologicalorganization remains under-developed. In this paper we review the biological idea ofhierarchy of life and explore what medical research and practice might look like …

Go to article

Farmers As Water Managers In A Changing Climate – Can We Turn Sustainability Research Into Outcomes?, K. B. Matthews, K. L. Blackstock, S. Langan, M. Rivington, D. G. Miller, K. Buchan Jul 2010

Farmers As Water Managers In A Changing Climate – Can We Turn Sustainability Research Into Outcomes?, K. B. Matthews, K. L. Blackstock, S. Langan, M. Rivington, D. G. Miller, K. Buchan

International Congress on Environmental Modelling and Software

How well does research-derived knowledge on sustainability translate into practical improvements in the sustainability of land and water management? This paper reflects on progress being made through the lens of the “Aquarius - Farmers as Water Managers” project part of Interreg IVb. This project seeks to use research-derived knowledge to aid the specification, delivery and evaluation of a flood alleviation scheme that uses natural flow management measures. The paper sets out previous research on the definition of outcomes and places these in the context of the specific criteria being used within the Interreg programme. Interreg provides an opportunity for researchers …

Go to article

Halldor Laxness And The Latter-Day Saints: The Story Behind The Novel Paradisarheimt, Fred E. Woods Jul 2010

Halldor Laxness And The Latter-Day Saints: The Story Behind The Novel Paradisarheimt, Fred E. Woods

BYU Studies

On the fiftieth anniversary of the publication of Halldor Laxness's Mormon-themed novel Paradisarheimt (Paradise Reclaimed), BYU professor Fred E. Woods tells the story of how the Nobel-prize winning author became interested in the topic of Mormon Icelandic immigration to Utah. Woods shares correspondence between Laxness and Latter-day Saints, thus portraying the friendships that developed as Laxness visited Utah for book research and continued to write to his friends for more information. Woods compares stories of real Icelandic Mormon immigrants with the fictional characters in Laxness's novel. At the time of the book's publication, some Mormon readers felt that …

Go to article

Climate Change Impact On Agriculture: Devils Lake Basin, Andrei Kirilenko Jul 2010

Climate Change Impact On Agriculture: Devils Lake Basin, Andrei Kirilenko

International Congress on Environmental Modelling and Software

Northern Great Plains is one of the most important agricultural regionsworldwide. This is also a region expected to be heavily impacted by climate change. Thisand two other papers in this session concentrate on studying climate change impacts onwater resources of the region, and on the impacts of these changes on agriculture. Themajor focus of our interest is Devils Lake watershed in North Dakota. The watershed islocated in the Northern Great Plains, the area where intensive agriculture has caused anextreme change in land use and land cover, followed by substantial water pollution. DevilsLake is an endorheic (terminal) lake, which makes it …

Go to article

Integrated Agricultural System Modeling Using Oms 3: Component Driven Stream Flow And Nutrient Dynamics Simulations, James C. Ascough Ii, Olaf David, P. Krause, Manfred Fink, S. Kralisch, H. Kipka, Marcel Wetzel Jul 2010

Integrated Agricultural System Modeling Using Oms 3: Component Driven Stream Flow And Nutrient Dynamics Simulations, James C. Ascough Ii, Olaf David, P. Krause, Manfred Fink, S. Kralisch, H. Kipka, Marcel Wetzel

International Congress on Environmental Modelling and Software

This study reports on the integration of the European J2K-S model (a component-based system for fully distributed simulation of water balance and N dynamics in large watersheds) under the Object Modeling System 3 (OMS3) environmental modeling framework and subsequent evaluation of OMS3/J2K-S performance on the Cedar Creek Watershed (CCW) in northeastern Indiana, USA. Uncalibrated model performance for daily and monthly stream flow response was assessed using Nash- Sutcliffe model efficiency (ENS) and percent bias (PBIAS) model evaluation coefficients. Simulations for nitrogen (N) loadings to Cedar Creek were also performed; however, the OMS3/J2K-S N dynamics sub-model is still undergoing testing so …

Go to article

Urban Shrinkage: A Vicious Circle For Residents And Infrastructure? - Coupling Agent-Based Models On Residential Location Choice And Urban Infrastructure Development, Nina Schwarz, Dagmar Haase Jul 2010

Urban Shrinkage: A Vicious Circle For Residents And Infrastructure? - Coupling Agent-Based Models On Residential Location Choice And Urban Infrastructure Development, Nina Schwarz, Dagmar Haase

International Congress on Environmental Modelling and Software

One of the challenges of simulating urban regions in Europe is urban shrinkage, where de-industrialisation, massive population losses and ageing cause housing vacancies in cities. These vacancies decrease efficiency in urban infrastructure and result in problems related to under-utilisation. Investigating the relationship between residential location choice and infrastructure-related decisions can foster urban planning related to shrinkage. This paper presents a coupled simulation of two agent-based models: a) Resident agents belong to different household types. They decide upon their location and move to existing flats or houses. For this, they consider aspects such as their preference for certain urban structural types …

Go to article

A Crane Movement Model Parameterized Using Portable Radar For Evaluating Response To Wind Energy Development, Eileen M. Kirsch, Richard S. Sojda, Robert H. Diehl, Manuel Suarez Jul 2010

A Crane Movement Model Parameterized Using Portable Radar For Evaluating Response To Wind Energy Development, Eileen M. Kirsch, Richard S. Sojda, Robert H. Diehl, Manuel Suarez

International Congress on Environmental Modelling and Software

The US Fish and Wildlife Service has an interest in understanding how sandhill and whooping cranes (Grus canadensis and G. americana, respectively) use habitats in the landscape surrounding Horicon National Wildlife Refuge in Wisconsin, USA. The refuge and adjacent state wildlife management areas contain the largest cattail marsh in the lower 48 states, providing important habitat for sandhill and whooping cranes, especially for roosting and staging for migration. Important feeding habitats are found in adjacent agricultural fields, small wetlands, and grasslands. It is in these feeding habitats that commercial wind turbines have been erected. We are studying crane movements in …

Go to article

An Agent Based Model Of Climate Change And Conflict Among Pastoralists In East Africa, Atesmachew B. Hailegiorgis, William G. Kennedy, Mark Rouleau, Jeffrey K. Bassett, Mark Coletti, Gabriel C. Balan, Tim Gulden Jul 2010

An Agent Based Model Of Climate Change And Conflict Among Pastoralists In East Africa, Atesmachew B. Hailegiorgis, William G. Kennedy, Mark Rouleau, Jeffrey K. Bassett, Mark Coletti, Gabriel C. Balan, Tim Gulden

International Congress on Environmental Modelling and Software

We present an agent-based model of human-environment interaction and conflict in East Africa using the MASON agent-based simulation environment. Our model focuses on the complex interaction of pastoral groups with their environment and other emerging external actors. Our model supports the observation that increased seasonal rainfall variability and droughts create tremendous stress on pastoralists groups and challenges their long-term resilience and adaptive response mechanisms.

Go to article

Urban Shrinkage: A Vicious Circle For Residents And Infrastructure? - Coupling Agent-Based Models On Residential Location Choice And Urban Infrastructure Development, Nina Schwarz, Dagmar Haase Jul 2010

Urban Shrinkage: A Vicious Circle For Residents And Infrastructure? - Coupling Agent-Based Models On Residential Location Choice And Urban Infrastructure Development, Nina Schwarz, Dagmar Haase

International Congress on Environmental Modelling and Software

One of the challenges of simulating urban regions in Europe is urban shrinkage, where de-industrialisation, massive population losses and ageing cause housing vacancies in cities. These vacancies decrease efficiency in urban infrastructure and result in problems related to under-utilisation. Investigating the relationship between residential location choice and infrastructure-related decisions can foster urban planning related to shrinkage. This paper presents a coupled simulation of two agent-based models: a) Resident agents belong to different household types. They decide upon their location and move to existing flats or houses. For this, they consider aspects such as their preference for certain urban structural types …

Go to article

Scenarios To Investigate The Effect Of Wetland Position In A Watershed On Nutrient Loadings, S. J. Melles, G. Benoy, B. Booty, Luis F. León, J. Vanrobaeys, I. Wong Jul 2010

Scenarios To Investigate The Effect Of Wetland Position In A Watershed On Nutrient Loadings, S. J. Melles, G. Benoy, B. Booty, Luis F. León, J. Vanrobaeys, I. Wong

International Congress on Environmental Modelling and Software

Lake Winnipeg is Canada’s 6th largest freshwater lake and is subject to an increasing rate of eutrophication as a result of nonpoint source pollution from numerous sources including farms and municipal wastewaters. We examine scenarios designed to compare the relative effects of wetland restoration and position on modelled nutrient loadings to Lake Winnipeg from a pilot watershed in the Lake’s Basin, the La Salle River watershed. Scenarios were examined using the Soil and Water Assessment Tool (SWAT). SWAT is a well-known watershed scale hydrologic model designed to assess non-point source pollution loadings to contributing streams across a wide range of …

Go to article

The Climatic Change Impact In Water Potential Processe On The Albanian Hydrographic River Network, Niko Pano, Alfred Frasheri, Bardhyl Avdyli Jul 2010

The Climatic Change Impact In Water Potential Processe On The Albanian Hydrographic River Network, Niko Pano, Alfred Frasheri, Bardhyl Avdyli

International Congress on Environmental Modelling and Software

The general cascade impt of climatic change on the water potential processe in the Albanian hydrographic river network is presented in this paper. Hydrological change impact in the sediment regime of the Albanian river system as an important part of the paper is present. The climatic change impact has been analysed in two principal aspects. Firstly by evaluation of the global water potential of the Albanian river system and secondly, by the influence of the climatic change in the multi-annual variation of this potential in the territory catchment area of this system.The climatic change impact processes in the Albanian hydrographic …

Go to article

A Comparison Of Fuzzy, Bayesian And Weighted Average Formulations Of An In-Stream Habitat Suitability Model., C. J. Brookes, Vikas Kumar, S. N. Lane Jul 2010

A Comparison Of Fuzzy, Bayesian And Weighted Average Formulations Of An In-Stream Habitat Suitability Model., C. J. Brookes, Vikas Kumar, S. N. Lane

International Congress on Environmental Modelling and Software

Three variations of a simple in-stream habitat suitability model were implementedand the effect on output for one organism at 22 sites on one short section of a river wasexamined. The model uses only two factors, depth and velocity, to calculate quality and a thirdfactor, width to quantify utility. The implementations were based on 3 multi-criteria evaluationapproaches: Weighted Average, Fuzzy Sets and Bayesian probability. There was broadagreement between the formulations but important differences in detail. The model outputsindicate that uncertainty arising from model formulation is significant and can have a bearingon planning decisions. There is a complex interaction between the formulations …

Go to article

Agent-Based Modeling Of A Rental Market For Agricultural Land In The Argentine Pampas, Federico Bert, Guillermo Podestá, Santiago Rovere, Michael North, Angel Menéndez, Carlos Laciana, Charles Macal, Elke Weber, Pamela Sydelko Jul 2010

Agent-Based Modeling Of A Rental Market For Agricultural Land In The Argentine Pampas, Federico Bert, Guillermo Podestá, Santiago Rovere, Michael North, Angel Menéndez, Carlos Laciana, Charles Macal, Elke Weber, Pamela Sydelko

International Congress on Environmental Modelling and Software

More than half of land in the Argentine Pampas is cropped by tenants. Theimportance of production on rented land motivated development of a LAnd Rental MArket(LARMA) model with endogenous formation of Land Rental Price (LRP). LARMA is a“hybrid” model that relies partly on easy-to-implement concepts from neoclassicaleconomics, but addresses drawbacks of this approach by being integrated into an agentbasedmodel that involves heterogeneous agents interacting in a dynamic environment.LRP formation assumes economic equilibrium: it is the price at which supply of rental landarea equals land demand. LRP depends on (a) the “willing to accept” price (WTAP) ofowners renting out land due …

Go to article

Exploring Forest Management Practices Using An Agent-Based Model Of Forest Insect Infestations, Liliana Pérez, Suzana Dragicevic Jul 2010

Exploring Forest Management Practices Using An Agent-Based Model Of Forest Insect Infestations, Liliana Pérez, Suzana Dragicevic

International Congress on Environmental Modelling and Software

The forests of British Columbia, Canada have undergone an unprecedented Mountain Pine Beetle, Dendroctonus ponderosae Hopkins, (MPB) infestation that has resulted in extensive mortality of lodgepole pine, Pinus contorta. The objective of this study is to apply the agent-based model (ABM) to simulate the MPB attack behaviour in order to evaluate how different harvesting policies influence spatial characteristics of the forest and spatial propagation of the MPB infestation over time. The first scenario is the no management action with the natural disturbance process leading the changes of the forest ecosystem. The other two scenarios implement sanitation and salvage harvesting methods. …

Go to article

An Agent-Based Model Of Coupled Housing And Land Markets, Nicholas Magliocca, Elena Safirova, Virginia Mcconnell, Margaret Walls Jul 2010

An Agent-Based Model Of Coupled Housing And Land Markets, Nicholas Magliocca, Elena Safirova, Virginia Mcconnell, Margaret Walls

International Congress on Environmental Modelling and Software

This paper describes a spatially disaggregated, economic agent-based model of urban land use that includes explicitly specified and coupled land and housing markets. The three types of agents— consumer, farmer and developer—all make decisions based on underlying economic principles, and heterogeneity of both individuals and the landscape is represented. The model can be used to simulate the conversion of farmland to housing development over time, through the actions of the agents in the land and housing markets. Land and building structures in the housing bundle are treated explicitly, so the model can represent the effects of land and housing prices …

Go to article

Validation And Sensitivity Analysis Of Catchment Runoff And Erosion Simulation Technology (Crest): A Gis-Assisted Soil Erosion Model At Watershed Level, Reynaldo L. Lanuza, Eduardo P. Paningbatan Jr Jul 2010

Validation And Sensitivity Analysis Of Catchment Runoff And Erosion Simulation Technology (Crest): A Gis-Assisted Soil Erosion Model At Watershed Level, Reynaldo L. Lanuza, Eduardo P. Paningbatan Jr

International Congress on Environmental Modelling and Software

Most erosion models have been developed based on a plot scale and have limited application to a watershed due to the differences in scale. In order to address this limitation, a GIS-assisted methodology for modeling soil erosion was developed using PCRaster to predict the rate of soil erosion at watershed level and identify the location of erosion prone areas. The GIS-assisted hydrology and erosion models were validated at Tanghaga Watershed using the observed values from previous experiment. The predicted peak rates, Qp, showed a highly significant relationship with the observed Qp, with an r2 value of 0.75. For soil loss …

Go to article

Feedbacks In Socio-Environmental Land Systems, Joerg A. Priess, Nina Schwarz, Sven Lautenbach Jul 2010

Feedbacks In Socio-Environmental Land Systems, Joerg A. Priess, Nina Schwarz, Sven Lautenbach

International Congress on Environmental Modelling and Software

The dynamics of socio-environmental systems are driven by exogenous forcesand by the interaction of endogenous system components, both within the social and environmentalrealms, as well as between them. In recent years, the number of models andmodelling frameworks explicitly representing feedbacks has increased, especially for modelsof land use systems. Land use changes are on the one hand caused by a complex interactionof human and/or institutional land use demands and the environment, which supportsor limits human use in several aspects. On the other hand, land use changes and theireffects at least partly influence the respective driving forces and future land-use decisions,e.g. by …

Go to article

Parcel Subdivision Automation For Agent-Based Land Use Modelling, Rohan Wickramasuriya, Laurie Chisholm, Marji Puotinen, Nicholas Gill Jul 2010

Parcel Subdivision Automation For Agent-Based Land Use Modelling, Rohan Wickramasuriya, Laurie Chisholm, Marji Puotinen, Nicholas Gill

International Congress on Environmental Modelling and Software

To a significant extent rural Australia is transforming into multifunctionallandscapes. Amenity migration (i.e. movement of people from metropolitan to ruralsettings) is a major driving force of this transition in many areas. However, the effects ofamenity migration on the receiving landscapes are not yet fully understood. Agent-basedland use modelling helps unravel the complex spatio-temporal relationships that affectlandscape response to change from amenity migration. A land subdivision module isessential for a complete agent-based land use model developed for these landscapesbecause the land sold to in-migrants are lots that are subdivided from much larger tracts. Inthis paper we describe a land subdivision automation …

Go to article

First Prev Next Last