Running Water Earth - Chapter 16 Stan Hatfield Southwestern Illinois College
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1 Running Water Earth - Chapter 16 Stan Hatfield Southwestern Illinois College
2 Hydrologic Cycle The hydrologic cycle is a summary of the circulation of Earth s water supply. Processes involved in the hydrologic cycle are: Precipitation Evaporation Infiltration Runoff Transpiration
3 Hydrologic Cycle
4 Sources of Earth s Water
5 Running Water Begins as sheet flow 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 Sheet flow develops into tiny channels called rills.
6 Drainage networks Running Water Land area that contributes water to the stream is the drainage basin. Imaginary line separating one basin from another is called a divide.
7 Drainage Basin
8 Streamflow 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
9 Streamflow Streamflow Factors that determine velocity Discharge is 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
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11 Streamflow Changes from upstream to downstream Profile Profile is a smooth curve. Gradient decreases downstream. Factors that increase downstream Velocity Discharge Channel size
12 Longitudinal Profile of Kings River, California
13 Changes in Channel Properties
14 Streamflow Changes from upstream to downstream Factors that decrease downstream Gradient Channel roughness
15 The Work of Running Water Stream erosion Lifting loosely consolidated particles by: Abrasion Dissolution Stronger currents lift particles more effectively.
16 The Work of Running Water Transport of sediment by streams Transported material is called the stream s load. Types of load Dissolved load Suspended load Bed load Capacity is the maximum load a stream can transport.
17 Stream Transport
18 The Work of Running Water Competence Indicates the maximum particle size a stream can transport Determined by the stream s velocity
19 The Work of Running Water Deposition of sediment by a stream Caused by a decrease in velocity Competence is reduced. Sediment begins to drop out. Stream sediments Generally well sorted Stream sediments are known as alluvium.
20 The Work of Running Water Deposition of sediment by a stream Channel deposits Bars Braided streams Deltas Floodplain deposits Natural levees form parallel to the stream channel by successive floods over many years.
21 A Braided River in Alaska
22 The Work of Running Water Deposition of sediment by a stream Floodplain deposits Back swamps Yazoo tributaries Alluvial fans Develop where a high-gradient stream leaves a narrow valley Slope outward in a broad arc
23 Base Levels and Graded Streams A base level is the lowest point to which a stream can erode. Base levels and graded streams Two general types of base levels: 1. Ultimate (sea level) 2. Local or temporary Changing conditions causes readjustment of stream activities. Raising base level causes deposition. Lowering base level causes erosion.
24 Adjustment of a Base Level to Changing Conditions
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27 Stream valleys Running Water The most common landforms on Earth s surface Two general types of stream valleys: 1. Narrow valleys» V-shaped» Downcutting toward base level» Features often include rapids and waterfalls.
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29 V-Shaped Valley of the Yellowstone River
30 Stream valleys Running Water Two general types of stream valleys: 2. Wide valleys» Stream is near base level.» Downward erosion is less dominant.» Stream energy is directed from side to side forming a floodplain.
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32 Running Water Incised meanders and stream terraces Incised meanders Meanders in steep, narrow valleys Caused by a drop in base level or uplift of the region Terraces Remnants of a former floodplain River has adjusted to a relative drop in base level by downcutting.
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39 Depositional Landforms Features created by stream deposition Deltas Floodplains Erosional floodplains Depositional floodplains Meanders Cut bank and point bar Cutoffs and oxbow lakes
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44 Meanders on the White River, Arkansas
45 Oxbow Lakes on the Green River, Wyoming
46 Depositional Landforms Features created by stream deposition Natural levees Alluvial fans
47 Natural Levees
48 Alluvial Fan in Death Valley, California
49 Drainage pattern Running Water Pattern of the interconnected network of streams in an area Common drainage patterns Dendritic Radial Rectangular Trellis
50 Drainage Patterns
51 Drainage Patterns Headward erosion and stream piracy A stream can lengthen its course by either: Building a delta Headward erosion Headward erosion may result in stream piracy, which is the diversion of the drainage of one stream into another.
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53 Drainage Patterns Formation of a water gap A water gap is a notch where a river cuts through a ridge that lies in its path. Two possible methods of formation: 1. Antecedent stream Stream existed before the ridge was formed. 2. Superposed stream Stream was let down upon a preexisting structure.
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57 Floods and Flood Control Floods and flood control Floods are the most common and most destructive geologic hazard. Causes of flooding Result from naturally occurring and human-induced factors
58 Floods and Flood Control Floods and flood control Types of floods Regional floods Flash floods Ice-jam floods Dam-failure floods
59 Floods and Flood Control Floods and flood control Flood control Engineering efforts» Artificial levees» Flood-control dams» Channelization Nonstructural approach through sound floodplain management
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