{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

15_streams_09_post - 15 Surface Processes 2-Streams Why...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Streams: Streams: 1 15: Surface Processes 2-- Streams Meadering Alaskan river. Photo: P. Kresan Braided streams in Alaska. Photo: G.M. Ashley Incised meanders, San Juan River, Utah. Photo: T. Bean Streams: Streams: 2 Why this is important Streams are major component of the hydrologic cycle powered by the sun and gravity. Plate, p. 552 Streams: Streams: 3 Streams carry most of the water that goes from land to sea, in the process transporting billions of tons of sediment. Iguaçu River, Brazil. Photo: D. Nausbaum Why this is important Streams: Streams: 4 Running water is the most effective sculptor of the landscape. Incised meanders, San Juan River, Utah. Photo: T. Bean Why this is important
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Streams: Streams: 5 Definitions Stream : channeled flow of water of any size (river, brook, creek are loosely defined by size) Channel : conduit for carrying water Floodplain : low- lying area surrounding the channel that is normally dry but may become submerged during high stream flows. Streams: Streams: 6 Water budget Fig. 17.2 Gains: rain, snow, melting snow; swamps and lakes; soil moisture; tributaries; upward-flowing groundwater; storm drains, sewage pipes Losses: evaporation, downward-flowing groundwater, pumping Streams: Streams: 7 Stream evolution Fig. 17.3 (a) Sheetwash : overlapping films or sheets of water that move downslope (think of water flowing down a driveway) (b) Faster-moving sheetwash scours a channel. (c) Channel lengthens upslope by eroding at start of channel ( headward erosion ); secondary streams ( tributaries ) join the main stream to form a drainage basin Streams: Streams: 8 Stream evolution Fig. 17.3 Headward erosion in Canyonlands National Park, Utah. Photo: R.W. Schlische
Image of page 2
Streams: Streams: 9 Drainage basins Fig. 17.4 Flat-lying strata of uniform lithology Isolated high 2 sets of fractures Valley & Ridge Streams: Streams: 10 10 Divides Drainage divide : ridge that separates one drainage basin from another Fig. 17.5 Streams: 11 Divides Fig. 17.6 Continental divide : drainage divide that separates streams that drain into the Atlantic Ocean and the Pacific Ocean Streams: 12 Divides Fig. 17.5 Continental divide : drainage divide that separates streams that drain into the Atlantic Ocean and the Pacific Ocean
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Streams: Streams: 13 13 Stream flow Laminar flow : channelized flow paths are all parallel to one another Turbulent flow : irregular flow paths, produced in irregular channels or at high velocities Fig. 17.10 Streams: Streams: 14 14 Stream transport Dissolved load : high in humid climates (higher chemical weathering).
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern