Ch16_As Presented

Ch16_As Presented - Chapter 16 Running Water Hydrologic...

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Unformatted text preview: Chapter 16 Running Water Hydrologic cycle The hydrologic cycle is a summary of the circulation of Earth’s water supply Processes involved in the hydrologic cycle • Precipitation • Evaporation • Infiltration • Runoff • Transpiration The hydrologic cycle Figure 16.3 Sources of Earth’s water Figure 16.2 Running water Begins as sheetflow • Infiltration capacity is controlled by • Intensity and duration of rainfall • Prior wetted condition of the soil • Soil texture • Slope of the land • Nature of the vegetative cover • Sheetflow develops into tiny channels called rills Running water Streamflow • Two types of flow determined primarily by velocity • Laminar flow • Turbulent flow • Factors that determine velocity • Gradient , or slope • Channel characteristics including shape, size, and roughness Running water Streamflow • Factors that determine velocity • Discharge – the volume of water moving past a given point in a certain amount of time Changes from upstream to downstream • Profile • Cross-sectional view of a stream • Viewed from the head (headwaters or source) to the mouth of a stream Running water Changes from upstream to downstream • Profile • Profile is a smooth curve • Gradient decreases downstream • Factors that increase downstream • Velocity • Discharge • Channel size Longitudinal profile of a stream Figure 16.7 Running water Changes from upstream to downstream • Factors that decrease downstream • Gradient • Channel roughness Base level and graded streams • Base level is the lowest point to which a stream can erode Running water...
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Ch16_As Presented - Chapter 16 Running Water Hydrologic...

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