Geol 1040 1st Edition Lecture 32Outline of Last Lecture VI. What streams doa. Erosionb. Transport of sediment c. Depositiond. Characteristics of stream sedimentsVII. Deposition creationsa. Point barsb. Deltasc. LeveesVIII. Stream Valleysd. Two typesOutline of Current Lecture IX. Stream Valleysa. Alluvial fansb. Characteristicsc. Outside of streamd. Inside of streamX. FloodingThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. Flood plainb. Floodsc. Types of Floodsd. Flood ControlCurrent LectureIX. Stream Valleysa. Alluvial fansi. High to low velocity1. When water comes down from the mountains and meets the valley floor the velocity goes from high to low quickly and sediments drop out.b. Characteristicsi. Downward erosion is less dominant hereii. Stream energy is directed from side to side forming the flood plainiii. Meandering streams1. Cut banks caused by erosion2. Point bar created by alluvialiv. Narrowv. V- Shaped valleysvi. Widening1. Cutoffs and oxbow lakesa. Oxbow lakes: A meandering stream erodes material away and cuts off a loop. This loop then becomes a lakeXI. Meandering Streamsa. Outside of streamvii. Cut bank1. Faster water 2. Deeper erosionb. Inside of streamviii. Point bar1. Slower water2. DepositionXII. Floodinga. Flood plainix. Valley filled with sediment from former channelsx. Terraces1. Remnants of a former flood plains2. River adjusted to relative drop in base level by down cutting a. Oldest terrace on topb. Floodsxi. Most common geo hazardsxii. Causes: Natural and human educed factorsc. Types of Floodsxiii. Regional1. River floods region due to inclement weatherxiv. Flash Floods1. Quick floodingxv. Ice-Jam Floods1. A river is mostly frozen then when it thaws, a dam of ice may stop riverxvi. Dam Failure floods1. Water dams open and floodd. Flood Controlxvii. Engineering efforts1. Artificial levees2. Flood control dams3. Channelizationa. Scoop out bottom of river4. Floodplain managementa. Restricting what goes on flood
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