The Periglacial Environment: Past and Present

Abstract

PART ONE: THE PERIGLACIAL DOMAIN. 1. INTRODUCTION. 1.1. The periglacial concept. 1.2. Disciplinary considerations. 1.3. The growth of periglacial knowledge. 1.4. The periglacial domain. 1.5. The scope of periglacial geomorphology. Advanced reading. Discussion topics. 2. PERIGLACIAL LANDSCAPES? 2. 1 Introduction. 2. 2 Proglacial, paraglacial or periglacial? 2. 3 Unglaciated periglacial terrain. 2. 4 Relict periglacial landscapes. 2. 5. Conclusions. Advanced reading. Discussion topics. 3. PERIGLACIAL CLIMATES. 3.1 Boundary conditions. 3.2 Regional climates. 3.3 Ground climates. 3.4. Periglacial climates and the cryosphere. Advanced reading. Discussion topics. PART TWO: PRESENT-DAY PERIGLACIAL ENVIRONMENTS. 4. COLD-CLIMATE WEATHERING. 4. 1 Introduction. 4. 2 Ground freezing. 4. 3 Freezing and thawing. 4. 4. The ground temperature regime. 4. 5. Rock (frost?) shattering. 4. 6. Chemical weathering. 4. 7. Cryogenic weathering. 4. 8. Cryobiological weathering. 4. 9. Cryopedology. Advanced reading. Discussion topics. 5. PERMAFROST. 5. 1. Introduction. 5. 2. Thermal and physical properties. 5. 3. How does permafrost aggrade? 5. 4. Distribution of permafrost. 5. 5. Relict permafrost. 5. 6. Permafrost hydrology. 5. 7 Permafrost and terrain conditions. 5. 8. The active layer. Advanced reading. Discussion topics. 6. SURFACE FEATURES OF PERMAFROST. 6. 1. Introduction. 6. 2. Thermal-contraction-crack polygons. 6. 3. Organic terrain. 6. 4. Rock glaciers and permafrost creep. 6. 5. Frost mounds. 6. 6. Active-layer phenomena. Advanced reading. Discussion topics. 7. GROUND ICE. 7. 1. Definition and description. 7. 2. Classification. 7. 3. Ice distribution. 7. 4. Cryolithology and cryostratigraphy. 7.5 Ice wedges. 7. 6. Massive ice and massive-icy bodies. 8. THERMOKARST. 8. 1 Introduction. 8. 2. Causes of thermokarst. 8. 3. Thaw-related processes. 8. 4. Thermokarst sediments and structures. 8.5. Ice-wedge thermokarst relief. 8. 6. Thaw lakes and depressions. 8. 7. Thermokarst-affected terrain. 8. 8. Man-Induced thermokarst Advanced reading. Discussion topics. 9. HILLSLOPE PROCESSES AND SLOPE EVOLUTION. 9. 1. Introduction. 9. 2. Slope morphology. 9. 3. Mass wasting. 9. 4. Slow mass-wasting. 9. 5. Rapid mass-wasting. 9.6 Slopewash. 9.7. Frozen and thawing slopes. 9. 8. Cold-climate slope evolution. Advanced reading. Discussion topics. 10. AZONAL PROCESSES AND LANDFORMS. 10. 1. Introduction. 10. 2. Fluvial processes and landforms. 10.3. Aeolian processes and sediments. 10.4 Coastal processes and landforms. PART THREE: WUATERNARY AND LATE-PLEISTOCENE PERIGLACIAL ENVIRONMENTS. 11. QUATERNARY PERIGLACIAL CONDITIONS. 11. 1. Introduction. 11. 2. The time scale and climatic fluctuations. 11. 3. Global (eustatic) considerations. 11. 4. Pleistocene periglacial environments of high latitude. 11. 5. Pleistocene periglacial environments of mid-latitude. 11. 6. Conclusions. Advanced reading. Discussion topics. 12. EVIDENCE FOR PAST PERMAFROST. 12. 1. Introduction. 12. 2. Past permafrost aggradation. 12. 3. Past permafrost degradation. 12. 4. Summary. Advanced reading. Discussion topics. 13. PERIGLACIAL LANDSCAPE MODIFICATION. 13. 1. Introduction. 13. 2. Intense frost action. 13. 3. Intense wind action. 13. 4. Fluvial activity. 13. 5. Slope modification. Advanced reading. Discussion topics. PART FOUR: APPLIED PERIGLACIAL GEOMORPHOLOGY. 14. GEOTECHNICAL AND ENGINEERING ASPECTS. 14. 1. Introduction. 14. 2. Cold-regions engineering. 14. 3. Provision of municipal services and urban infrastructure. 14. 4. Construction of buildings and houses. 14. 5. Problems of water supply. 14. 6. Roads, bridges, railways and airstrips. 14. 7. Oil and gas development. 14. 8. Mining activities. Advanced reading. Discussion topics 15. CLIMATE CHANGE AND PERIGLACIAL ENVIRONMENTS. 15. 1. Global change and cold regions. 15. 2. Climate change and permafrost. 15. 3. Future responses. 15. 4. The urban infrastructure. 15. 5. Conclusions. Advanced reading. Discussion topics. References. Index.