Table of contents Forewords Acknowledgernent Preface Introduction General View of the W AVES Prograrn Thomas Gaiser, Luiz Gonzaga Rebouças Ferreira and Karl Stahr Part 1: Integrative 1 Methods and Results Integrated Scenarios of Regional Developrnent in Ceará and Piauí 19 Petra Dali, Maarten Krol, Dagmar Fuhr, Thomas Gaiser, Joachim Herfort, Sabine Hõynck, Annekathrin Jaeger, Christoph Külls, E. Mario Mendiondo, Andreas Printz and Susanne Voerkelius Integrated Modeling of Clirnate Change Impacts in Northeastern Maarten S. Krol, Ann-Kathrin Jaeger and Axel Bronstert The GIS-Based Model for Sustainable (MOSDEL) Andreas Printz and Ruth Lang Part 2: Natural Ceará and Socio-Econornic Developrnent ofLand Brazil .....43 Use 57 Conditions The Clirnate of Piauí and Ceará Peter C. Werner and Friedrich-Wilhelm in the States of Piauí and 81 Gerstengarbe Water Resources of Ceará and Piauí Horst Frischkorn, José Carlos Araújo, Maria Marlúcia F. Santiago 87 Physical and Environrnental Context in the State of Ceará Marcos José Nogueira de Souza and Vladia Pinto Vidal de Oliveira 95 Survey of the Vegetation in the State of Ceará 105 Carlos Lineu Frota Bezerra, Eliedir Ribeiro da Cunha Trigueiro, Antonio Alberto Jorge Farias Castro and Antônio Sérgio Farias Castro Survey of the Vegetation in the State of Piaui.. Antonio Alberto Jorge Farias Castro Degradation Factors in a Risk-Prone Area: the Semiarid Northeast of Brazil Hartmut Gaese ll7 125 Part 3: Climate Scenarios and Climate Modeling Climate Analysis and Scenarios for Northeast Brazil Friedrich-Wilhelm Gerstengarbe and Peter C. Werner 137 Dynamic Regional Climate Modeling and Sensitivity Experiments for the Northeast of Brazil 153 Uwe Bõhm, Friedrich- Wilhelm Gerstengarbe, Detlef Hauffe, Martin Kücken, Hermann Ôsterle and Peter.C. Werner Part 4: Water Availability, Water Management and Water Use Investigations on Water Management and Water Quality in Picos/PI and Tauá/CE 173 Susanne Voerkelius, Christoph Külls, Maria Marlúcia F. Santiago, Horst Frischkorn, Ligia Alves dos Santos Sernrau, Gerold Heinrichs, Margarita M. López Gil Water Quality in the Guaribas River Basin for Irrigation Use 185 Décio Frota, Margarita M. López Gil, Airton Ramalho, Francisco Dantas and Vladira Vieira Groundwater as Indicator for Paleoclimatic Change in the Northeast of Brazil Horst Frischkorn, Maria Marlúcia F. Santiago and Markus Forster 193 Sedimentation of Reservoirs in Semiarid Brazil.. 205 José Carlos de Araújo, Lia Fernandes, José Christiano Machado Júnior, Márcia Regina Lima Oliveira and Tácito Cunha Sousa Large-Scale Hydrological Modeling of a Semiarid Environment: Model Development, Validation and Application Andreas Güntner and Axel Bronstert 217 Reservoir Yield Vulnerability Under Global Change 229 José Nilson Beserra Campos, Ticiana Marinho de Carvalho Studart and Patrícia Freire Chagas Modeling of Present and Future Water Use in Piauí and Ceará as a Basis for Water Resources Planning 239 Petra DõU, Maike Hauschild, E. Mario Mendiondo and Jose Carlos de Araújo Assessment of Water Costs in Semiarid Brazil.. José Carlos de Araújo, Cláudia Beghini Rodrigues Abreu, Cláudio Pacheco Barbosa and Elano Lamartine Leão Joca 253 Part 5: AgricuItural Productivity and Soils An Information System for Land Resources in Piauí and Ceará 267 Thomas Gaiser, Frieder Graef, Thomas H. Hilger, Luiz G.R. Ferreira and Karl Stahr Effectiveness of Fertilization and Other AgricuItural Management Options in Picos and Tauá, NE Brazil 279 Joachim Herfort, Inacio de Barros, Luiz Gonzage Rebouças Ferreira, Thomas Gaiser, Leonhard Schneider, Bettina Bach and Thomas Hilger Seepage and Groundwater Recharge in Sandy/Loamy Chapada Soils of the Picos Region, Piauí 291 Frank-Michael Lange, Dietrich Halm and Thomas Gaiser Part 6: Vegetation and Landscape Ecology Sustainable Use of Natural Resources in the Municipality of Tauá-Ceará .. 305 Vládia Pinto Vidal de Oliveira, Andreas Printz, Stephan Schmidt and Carlos Lineu Frota Bezerra Cerrado and Caatinga in the Picos Area 323 Antonio Alberto Jorge Farias Castro, Andreas Printz, Maura Rejane de Araújo Mendes, Francisco de Assis Rodrigues Soares, José Orlando Soares Oliveira, Rigoberto Sousa Albino, Frank-Michael Lange and Ruth Raquel Soares de Farias Climate and Desertification in the Picos Region M. C. L. Sales, V.M. Ramos and lG.B. de Oliveira 335 Part 7: Economic and Socio-Cultural Analyses Quality of Life and Migration - Concepts and Results of the Socioeconomic Survey in Tauá and Picos Dagmar Fuhr with contributions from Martin Grebe, Andreas Dõring, Francisco Matias da Rocha and Ernst-Dieter Lantermann 349 Economic Analysis of Different Farming Systems on the Individual Farm LeveI in the Northeast of Brazil 361 Bettina Bach, Maria Irles de Oliveira Mayorga and Jürgen Zeddies Structure and Possible Development of the Agricultural Sector of Ceará and Piauí Sabine Hõynck Groundwater Supply Conditions and WiUingness To Pay for Desalinated Water in Tauá (Brazil) José César Vieira Pinheiro, Luiz Artur Clemente da Silva, Marcelo Theophilo Folhes and Manuel-Osório de Lima Viana 375 389 Part 8: Supporting Mathematical Tools Visualization and 3-D Analysis of Sedimentation in Water Reservoirs 401 C. A. Vidal, N. J. B. Cavalcante, J. C. Araújo, A. S. Silva and E. A. Silva Effectiveness of Parallelization Applied to Large-Scale Linear Mauro C. Pequeno, Clécio Linhares, Kíssia Carvalho, and Vitor Santos Authors and Affiliations of Solution and Optimization Algorithms Problems for the W AVES Project.. .411 A. T. Fontelles, Valdísio Viana, Andréa Alinson Donato, Auler Sousa, Rodrigo Ribeiro 425