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From this high promontory, the landforms of the Sonoran Des- ert take on awesome proportions. The mesas, buttes, cinder cones, basalt flows, mountains, and valleys, all carved and modi- fied by water in this dry place, must be measured in kilometers and millions of years. Even the colors are dazzling. The volcanic rocks, altered by ancient hydrothermal activity, glow a warm orange and yellow in the October sun. The bright, clear light illuminates each tiny crevice etched by weathering and erosion in the cliffs. Several hundred meters below and about a kilo- meter away the river rolls, a brown silt-laden ribbon on the floor of the gorge. The water rustles so quietly that I can hear it only when the wind dies. In the distance, sharp mountain peaks rake the bottom of the ocean of air where streamers of clouds stretch over the horizon to the ocean of water. The field is a fitting place to write the preface for a book on geomorphology because of the importance of the field experi- ence in the development of the science. Dramatic landforms and processes, especially in drylands, have excited the imagination and intellect of artists, writers, and scientists. Each observer has explored a different route to knowing and understanding this thin envelope that is the contact between sky and earth. De- scriptions of these striking landscapes have appealed to cataclys- mic forces, operation of machine-like processes, and even ran- dom occurrences governed by happenstance.
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From this high promontory, the landforms of the Sonoran Des ert take on awesome proportions. The mesas, buttes, cinder cones, basalt flows, mountains, and valleys, all carved and modi fied by water in this dry place, must be measured in kilometers and millions of years. Even the colors are dazzling. The volcanic rocks, altered by ancient hydrothermal activity, glow a warm orange and yellow in the October sun. The bright, clear light illuminates each tiny crevice etched by weathering and erosion in the cliffs. Several hundred meters below and about a kilo meter away the river rolls, a brown silt-laden ribbon on the floor of the gorge. The water rustles so quietly that I can hear it only when the wind dies. In the distance, sharp mountain peaks rake the bottom of the ocean of air where streamers of clouds stretch over the horizon to the ocean of water. The field is a fitting place to write the preface for a book on geomorphology because of the importance of the field experi ence in the development of the science. Dramatic landforms and processes, especially in drylands, have excited the imagination and intellect of artists, writers, and scientists. Each observer has explored a different route to knowing and understanding this thin envelope that is the contact between sky and earth. De scriptions of these striking landscapes have appealed to cataclys mic forces, operation of machine-like processes, and even ran dom occurrences governed by happenstance.
The subject of the book is a synthesis of theoretical developments concerning river processes and forms in drylands - the semiarid, arid, and extremely arid portions of the earth's surface. The work describes the present understanding of dryland rivers, using a theoretical framework with examples and results of research from many areas of the world. The most important feature of this book is that it represents the first organized review of the knowledge about dryland rivers. Information on practical management and planning is also included. The book is unique in that it stresses the philosophical and methodological aspects of geomorphologic research, rather than merely reporting results. Scientists may expect to use the work frequently as a guide to the literature, an intellectual review of previous ideas in the field, and an indication of where further work is needed. Planners and decision makers in dryland regions may expect to use the book as an entre to the science of geomorphology as applied to dryland environments.
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