Discusses the latest information regarding the processes and mechanisms responsible for runoff and erosion by water in arable lands--detailing state-of-the-art water and soil conservation methods. Elucidates the rehabilitation of agricultural lands depleted by human activity.
TO THE MODEL EVALUATION 1. MODELLING SOIL EROSION BY WATER l 2 John Boardman and David Favis-Mortlock 1 School of Geography and Environmental Change Unit Mansfield Road University of Oxford Oxford OX1 3TB UK 2 Environmental Change Unit University of Oxford 5 South Parks Road Oxford OX1 3UB UK Introduction This volume is the Proceedings of the NATO Advanced Research Workshop 'Global Change: Modelling Soil Erosion by Water', which was held on II-14th September 1995, at the University of Oxford, UK. The meeting was also one of a series organised by the IGBP 1 GCTE Soil Erosion Network, which is a component of GCTE's Land Degradation Task (3.3.2) (Ingram et aI., 1996; Valentin, this volume). One aim of the GCTE Soil Erosion Network is to evaluate the suitability of existing soil erosion models for predicting the possible impacts of global change upon soil erosion. Due to the wide range of erosion models currently, in use or under development, it was decided to evaluate models in the following sequence Favis-Mortlock et al., 1996): • field-scale water erosion models • catchmenr-scale water erosion models • wind erosion models • models with a landscape-scale and larger focus. As part of this strategy, the first stage of the GCTE validation of field-scale erosion models was carried out at the Oxford NATO-ARW. I A list of Acronyms fonns Appendix A.
The integration of classic field-gathered data with new computer models has allowed many new advances in geomorphology, which the 31st Binghamton Millennium Symposium 2000 presents in this latest of the well-known Binghamton book series, the Integration of Computer Modeling and Field Observations in Geomorphology. Conceptual models have been most commonly inferred from analyses of topography and investigator perspectives derived from fieldwork. The main stumbling blocks to understanding surface processes, their interactions, temporal changes, and resulting landforms are the difficulty of observation, geological timescales involved, spatial-scale dependencies, and the inability to attribute differences to either process or age. Physically based computer models have thus become essential tools, primarily because of their ability to explore spatial and temporal trends and to determine the sensitivity of physical inputs to change without the difficulties of identification and generalization associated with the complexity of field studies. Thus, the combination of both methods, or the integration of field methods with computer modeling become a very powerful mechanism for robust understanding. This new book presents topics on fluvial processes of overland and channelized flow in arid, humid, and periglacial areas of high and low relief, as well as work on interlinked biogeographic and geomorphic fluctuations in alpine terrain, and ground penetrating radar of coastal geomorphology. Issues of long-term evolution of drainage networks are addressed in natural systems, as well as stream-table environments, and terrain analyses characterize surficial and subsurface geomorphic features by using GIS and remote sensing. Botanical and biogeomorphologic controls of landforms are assessed, along with issues of scientific visualization, cartographic representation, DEMs, spatial analyses, and scale dependencies.