Water erosion

ls535's version from 2017-05-22 14:21

Section 1

Question Answer
Flores et al 2006Model of headcut retreat (CHILD) indicates that heatcut retreat is most significant in zones with either gentle slopes or large headcut heights
Starkel 2005evolution of gullies - deepening depends on stream power
Smith 19576 factors affect sheet erosion magnitude (length, percent slope, cropping, soil, management and rainfall)
Baur 1952Sheet erosion is the removal of a uniform layer of soil or material from the landsurface by rainfall and runoff


Question Answer
Cook 1936Two factors affect rainfall erosion; falling drops hitting the surface and surface flow
Horton 1945Theoretical network model based on drainage network growth to decide stream ordering and stream junction angles
Kirchner 1993Networks are topographically random and also represent processes in their structure, no strong conclusion about the structure of stream networks
Kochel 1985A condition necessary for subsurface erosion is the removal of displaced soil

Section 2

Question Answer
Dendritic Tree-like with balanced branching among channels of different sizes, irregular directions. Occur with little tectonic control, gentle slopes and uniform lithology
Parallel Straight stream courses, parallel major channels, angular tributaries.Occur with moderate to steep slopes, elongated landforms restrict flow
Pinnate Featherlike, one major straight channel and smaller joining at regular intervals. Tectonic control of steep valleys
RectangularLarge number of right angled bends and tributaries nearly merge at right angles. Produced by system of joints or faults that meet at right angles (zones of weakness)
TrellisLattice like, lots of small channels, low sinuosity and tributaries merge at right angles. Found where there is folded or tilted strata