GLY 101 1st Edition Lecture 21Outline of Last Lecture I. Triggers of Mass WastingClassification of Mass Wasting ProcessesRapid and Slow Forms of Mass WastingOutline of Current Lecture II. The Hydrologic CycleIII. Running Water and StreamflowCurrent LectureII. The Hydrologic Cycle-the unending circulation of water is the hydrologic cycle- the hydrologic cycle tells what happens to water as it evaporates from oceans, plants and soil- infiltration is the the process of when precipitation falls and soaks into the ground- when precipitation flows over the surface this is called runof- when water is soaked up by plants and is released back into the atmosphere it is called transpiration-both transpiration and evaporation are considered to be the combined process of evapotranspiration - when water falls in cold areas or at high elevations/altitudes it becomes part of a snowfield or glacier- running water is the most important erosional agent sculpting Earth’s land surfaceIII. Running Water and StreamflowThese 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.-the amount of water that runs of depends on 5 things:(1) intensity/duration of rainfall, (2) how much water was already in the soil, (3)nature of surface material, (4) slope, (5) extent and type of vegetation-runof flows in broad, thin sheets across slopes in a process called sheet flow-stream- water that flows in a channel-a river carries substantial amounts of water and numerous tributaries- streams drain in drainage basins, each drainage basin is bounded by a divide- river systems are divided into 3 zones: (1) sediment production (2) sediment transport (3)sediment deposition - turbulent flow is when water moves erratically- laminar flow is when water moves in a straight line, parallel to the channel. mostly seen in slow moving streams- Factors that efect flow velocity are: (1) channel slope, (2) channel cross-sectional shape, (3) channel size and roughness, (4)
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