Erath systems Chapter 14

Erath systems Chapter 14 - Chapter 14: River Systems and...

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Chapter 14: River Systems and Landforms Elwha River Dam Built in 1913 32 m tall (105ft) Purposes of Dam Water storage Hydropower Negative side effects Downstream effect on ecosystems Changes river discharge, sediment supply, water temperature Big impact on migratory fish species such as salmon Dam removal started September this year Process will be gradual because of large sediment build up in the reservoir Ex: Removal of Condit Dam in white Salmon River Rivers and the Landscape Effective as an agent of erosion and deposition Dominant and prominent influence on the landscape Rivers in the earth system Major component in the hydrological cycle Bring freshwater to oceans Redistribution of sediment, nutrients Rivers and society Transport pathway Cooling water for industry (e.g. nuclear power) Water supply Can be a hazard during flooding I. Basic Fluvial Concepts Stream River typically refers to large systems 1. Fluvial stream related processes that involve running water 2. Hydrology the science of water and its global circulation, distribution, and properties 3. Erosion process in which stream water dislodges, dissolves, or removes surface material 4. Transport process in which eroded sediment is carried or moved in dissolved solution 5. Deposition process in which the materials are laid down in new locations 6. Alluvium general term for the clay, silt, sand, gravel, & mineral fragments deposited by running water May be sorted or semi-sorted sediment on a floodplain, delta, or streambed A. Base level 1. Base level is a level below which a stream cannot erode its valley ( ultimate base level = sea level ) streams flow downhill along a gradient from high elevation to sea level Through time erosion will level the gradient However, when the surface is even erosion will stop At the point, the stream has eroded the system to its base level B. Drainage Basins 1. Drainage basins basic fluvial system which is an open system ( ranging in size from tiny to vast ) aka watersheds a major drainage basin is made up of many smaller drainage basin terminate at the drainage divide
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Erath systems Chapter 14 - Chapter 14: River Systems and...

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