Geol 1040 1st Edition Lecture 31Outline of Last Lecture IV. Two Types of Base levelsa. Ultimateb. Local or temporaryc. ExampleV. Changes in levelsa. Base levels b. Sea levelOutline of Current Lecture VI. What streams doa. Erosionb. Transport of sediment c. Depositiond. Characteristics of stream sedimentsVII. Deposition creationsa. Point barsb. Deltasc. LeveesVIII. Stream Valleysd. Two typesCurrent LectureThese 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.VI. What streams doa. Erosioni. Lifts particles by1. Abrasion2. Dissolutionii. Stronger currents (more stream energy) can lift and transport larger particlesb. Transport of sediment iii. Transported material called loadiv. Load types:1. Dissolved load2. Suspended Load (Fine particles)3. Bed Loada. Material too heavy, but river pushes it c. Depositionv. Caused by a decrease in velocity ( energy)1. Stream does not have enough energy to carry2. Decrease in velocity can be due to decrease in gradientvi. Examples1. Point bars2. Bars in braided stream3. Deltas4. Natural levees and flood plainsd. Characteristics of stream sedimentsvii. Generally well sorted1. Known as alluvium (sediments)VII. Deposition creationsa. Point barsviii. High velocity outside of curveix. Lower velocity inside of curvex. The slower drops sediments making bar biggerb. Deltasxi. Sediments go from higher energy to lower energy quickly and dropc. Leveesxii. With each flood, bank walls are built up and creates natural leveesVIII. Stream Valleysa. Two typesxiii. Narrow valleys on mountain streams1. V shaped2. Down cutting tw base level3. Features often include rapids and water fallsxiv. Wide valleys1. Streams with curves2. Stream near base
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