ENV 4521 Lecture Notes - Lecture 3: Facies, Downcutting, Depositional Environment
16 Jun 2019
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They create a moving base, also can compromise foundations; allows water to seep in the cracks, contractions cause voids. How can ground subsidence occur? due to drying and compaction of clay. When water breaks down a rock and creates a void, occur in areas limestone, salt, or dolomite bedrock. Construction on perma-frost melts the ground causing subsidence solution is insulating structures. The lowest level that a stream channels floor can reach, when reached erosion slows and stream down cutting is stopped ultimate base level is sea level. What are sedimentary facies? are bodies of sediment recognizably different from adjacent sediment deposited in a different depositional environment. How do streams transport sediment; what controls deposition and erosion? runoff, precipitation, infiltration, evaporation, interception. They form when erosion occurs on side where water is faster, forming cut banks. How and where does a delta form? form where rivers enter into the ocean or a lake representing base-level.
