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Canada (156,138)
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GGR100H1 (41)
Chapter 14

GGR100 Chap 14 Notes (Geomorphology and Fluvial Landforms)
GGR100 Chap 14 Notes (Geomorphology and Fluvial Landforms)

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University of Toronto St. George
Sarah Finkelstein

GGR100Chapter 14 Textbook Notes 1Chapter 14 exam notes lec 4y Agents of erosion are wind ice and water Wind is classified as aeolian processes which is the movement of air around Earths surface Restricted to small parts of the continents Ice lab2 is important to us because of how relevant it is to Canadians Ice continues to exist and erode at high latitude and elevation Water shapes the landscape rivers etcy When water erodes streams produce fluvial erosion which is weathered sediment that is picked up for transport to new locations The solids are carried by mechanical transport Materials are laid down by a process called depositiony Running water naturally erodes the surface of earth flattening hills carving valleys and mountains in a process called denudation y Alluvium general term for clay silt sand gravel and mineral fragments deposited by running water as sorted or semisorted sediment on a floodplain delta or streambedy Stream related processed are Fluvialriverthey produce recognizable landforms Fluvial processes are driven by gravity and insolation Insolation gives moisture to fuel the streams In order for gravity to play a role the stream must be on a slope so that the water can flow downstream and collect Topography is important which y Stream erosion takes place through what is known as hydraulic actionis water causing squeeze and release action that loosens and lifts rocks As the debris moves along it mechanically erodes the streambed through the process of abrasion Particles grind and carve the streambed like liquid sandpapery Stream discharge the flow of the water is the volume of water that passes through a given section of a stream in a given amount of time calculated in 331meters cubed msm s The formula to measure discharge isDischargeWidth of section mDepth of water mvelocity of flow m s1 Discharge number will not change unless more water is introduced y Changes in the discharge from day to day are plotted on a hydrography Lag time explains how it takes time for water to move downslope through a stream network The greater the drainage basin the longer the lag time Lag time is explained by factors such as water shed in the network Lag time tells us that there are other streams taking the precipitation It takes about 3 days for water to pass through a stream
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