GEOG 101 Lecture Notes - Lecture 26: North Shore Mountains, Soil Liquefaction, Debris Flow
Document Summary
The urban subsurface why do we care? development for the following reasons: Knowledge of the geology and geomorphology of a place is essential to urban. Characteristics of the ground cities are built on (engineering geology). Know natural hazards, assess risks and vulnerability (flooding, subsidence, permafrost. Controlled by the nature of the underlying bedrocks, sediments and soils, and the thawing, landslides, volcanic activity, earthquakes, erosion). geological (volcanic, earthquake) and earth surface processes (fluvial processes, erosion). Building sites to avoid - subsurface as a constraint. Building on sites not suitable can have very large damaging consequences. Coast regions prone to erosion and floods. Karst and post-glacial kettle holds, and permafrost. Unconsolidated materials that are erodible and earthquake risk. During an earthquake some water saturated materials (e. g. sands, silts) may lose their strength and transform into a fluid. Foundations, roads, and pipes may be damaged as a result. Landslides are linked to orography (slope steepness) and subsurface materials.
