Geol 1040 1st Edition Lecture 38Outline of Last Lecture XIII. The water tablea. Depth variationsb. Unconfined aquiferc. Relations to wellsd. Artesian wellsOutline of Current Lecture XIV. Classifi cati on of mass movementsa. Type of Material involvedb. Amount of Waterc. Type of motionXV. Types of movementsa. Creepb. Slidesc. Falld. FlowCurrent LectureXIV. Classifi cati on of mass movementsa. Type of Material involvedi. Rockii. Soil (Earth)iii. Mudiv. Debris (roc, soil, mud veg)b. Amount of Wateri. Can triggerThese 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.ii. Change type. Dust slide or mud slidec. Type of motioni. Fall1. Free falling piecesii. Slide1. Material moves along a surface as a coherent massiii. Flow1. Material moves as a chaotic mixtured. How fast (velocity)i. Fast to slowXV. Types of movementsb. Creepi. Slowest and most widespreadii. Slow downhill movement of soil and uppermost rock layersiii. Caused by Swelling and shrinking of soil1. Freezing and expanding of water in pores2. Absorption of water, expansion of clay material 3. Heating by sun and increase in volume a. Expands with heat at day, contracts quickly at nightb. Soil expands perpendicular to ground surfacec. Slidesi. Surface slides down slopeii. Loose rock on surface rock. iii. Rotational slide or slump1. Movement of material as a unit along a curved (concave upward) slideiv. Translational slide1. Nearly planar slide surface2. Sliding material maintains coherenced. Falli. Rocks fall1. Freefall of detached rock2. Requires very high-angle slopeii. Rock slide1. Blocks of bedrock slide down a slope2. Generally very fast and destructivee. Flowi. Mass movements that behave like fluidsii. Range of:1. All sizes of materials2. Wet to dry3. Barely moving > 200 mph4. Graduation from movement on slip surface to no slip surface5. Many names :earth flow, mudflow, debris flows, debris avalancheiii. Earth flow1. Hillsides in humid regions2. Water saturates the soil3. Commonly involve materials rich in clay and silt4. Flow mechanism can be by
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