4-1
Fluvial Process - What Rivers do & pre conditioning
Ie: mass wasting and weathering
Rain, Rivers, Weather & Water. Davis - New England basis
Infiltration - duration & intensity
Previous condition (vegetation, soil, slope, etc)
Saturation Overland Flow - All spaces filled
Surface layer filled - Overland flow
New Orleans & Texas - Katrina
Hortonian Overland flow has much sediment
Through flow a interflow is seepage generated
Large pressure of ground water running down slope
Turbulent vs. laminar flow
Sheet flow surface H20 & sediment
rill - small channel downhill
Piping ability to remove sediment by seepage
Sapping is lowering of springs (surface/h2o otable)
Gully - deeper and steeper than rill
Branching channels (first step in cutting landscapes)
Soil Erosion - RUSLE = A = RUSLE
A= Predicted soil loss
R= Climate erosion Rainfall and Runoff
K= Soil erosion factor
L= Slope Length
S= Slope gradient
C= Cover & Management Practices
P= Erosion Control
R= Effect of rainfall & erosion (local differences)
K= Actual vs. standard loss of soil
L +S= Topographic factors
C= Row Crops vs. Bunch Crops
P= Mgt- Paddy, Contour, intercropping
5/A Max to Sustain viable soil and Intermittent vs. permanent flow vs. flood stage
Discharge - Volume H20 t
Q==wdv
Cross Section Flow