week 7 1 - 3 Dissolved load Deposi±on Controlled by...

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10/7 Three major stream processes 1. Erosion 2. Transport 3. Deposition Erosion Occurs in two areas o Hills and flat areas Flow types a.) overland flow (sheet flow) b.) channelized flow (concentrated flow) erosion type--- rills, gullies –increased erosion due to increased energy 2. Channels Flow type: channelized flow Erosion type: corrosion and corrasion o Corrosion: chemical erosion o Corrasion: mechanical or physical erosion (abrasion) Four type of corrasion: 1. Vertical 2. Horizontal 3. Oblique (takes place where water is going around a bend) 4. Knickpoint recession Transport Also known as “entrainment” Dependent on velocity of water Competence o Largest-sized particle that can be carried Capacity o Total amount of material that can be carried Sediment load Contaminants Three types of sediment load 1. Bed load 2. Suspended load
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Unformatted text preview: 3. Dissolved load Deposi±on Controlled by distance ²rom the source Loss o² transport “power” Caused by 1. Reducton of slope o STream enTering a body of waTer Example: delTas 2. Decrease in discharge (Q) WaTer bodies depositon Normal (Traditonal) 1. ±hinned wiTh disTance 2. Finer-sized wiTh disTance DensiTy currenT o Energy of currenT due To densiTy di²erence DensiTy currenT or “TurbidiTy currenT” o Examples: Lake Mead & Hoover Dam Human impacTs on ³uvial processes Geological erosion o Erosion under naTural or undisTurbed conditons AcceleraTed erosions o Increased raTe of erosion over/above The geological raTe broughT abouT by human actviTy Human acceleraton (acceleraTed erosion) 1. AgriculTural actviTy 2. Urbanizaton...
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