Download presentation
Presentation is loading. Please wait.
Published bySara Phelps Modified over 8 years ago
1
CGF3M Dynamics of Moving Water CGF3M
2
Dynamics of Moving Water The Hydrosphere Hydrologic Cycle Infiltration Runoff Stream Flow Velocity Discharge Flow
3
CGF3M Hydrologic Cycle Condensation Precipitation Infiltration Runoff Evaporation
4
CGF3M Hydrologic Cycle Infiltration: precipitation that seeps into the ground. Factors affecting infiltration: Interparticle size – the size and connectedness of the particles in the ground, eg., sand vs clay Vegetation (associated organisms) – loosen the soil. Rainfall intensity Seasonal factors, eg., freezing of the ground Permafrost – is there any, its depth Urban landscape - paving, buildings, etc.
5
CGF3M Hydrologic Cycle Infiltration con’t: When rain falls, the first type of erosion is splash erosion. Raindrop impacts reduce infiltration rate because the soil particles become more compacted movement of material downhill.
6
CGF3M
7
Hydrologic Cycle Runoff: flow of water from the land as both surface and subsurface discharge. Occurs when rate of precipitation is greater than rate of infiltration. Usefulness: recreational, sewage disposal, domestic, irrigation, food source, hydroelectric power, etc.
8
CGF3M Hydrologic Cycle Runoff Categories: Surface Runoff/Overland flow: excessive overland flow can lead to sheet erosion forming small rills or tiny rivers. can include Channel Flow (water traveling in a river or stream). Subsurface Runoff/Ground Water: travels beneath the surface towards a body of water.
9
CGF3M Stream Flow The velocity (speed) of flow in a river is controlled by: Gradient Friction due to resistance of water on the bed of the channel. Volume
10
CGF3M Stream Flow Discharge: volume of water that flows past a given point can be determined by the following factors: Q = A x V Q is discharge A is cross-sectional area of stream V is mean velocity (in m3/sec usually)
11
CGF3M Stream Flow Load: ability of a stream to carry load of solid material varies with discharge, velocity and particle size.
12
CGF3M
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.