ls535's version from 2017-05-22 09:25

Section 1

Question Answer
Dunne 1980Seepage erosion model, one critical conditions for seepage are reached a channel is initated and extends headward
Compare Dunne and Horton - Knighton 2014Dunne is betterat larger scale, explains why drainage patterns reflect geological structure
Willgoose et al 1991 Comprehensive model incorporating evolution of hillslopes and networks at the basin scale
Willgoose 1991In a catchment there is a threshold of erosion resistance which sets the location of a channel head at a specific drainage area and slope, determining the extent of the channel network in a watershed

Section 2

Question Answer
Davis 1890Cyclical model, based on america
Stage 1Landscape born by rapid uplift, high elevation but low mean relief. Erosion is concentrated in the river = deep valleys
Stage 2Youthful landscape, high mean relief and elevation. Valley lowers to base level and begins to rise. Hillslope erosion is important
Stage 3Conavo-convex form and weathered material is moved by creep. Lower mean elevation and mean relief decrease and valley widens
Stage 4Valleys can no longer deepen or widen and all lowering is done via rounding and lowering of interfluves by creep
EnvironmentHumid, temperate regions, steepest slope at the begining of the the process
FormConvex upper slope and concave lower slope. Starts steep with coarse material, becomes gentler and finer
PredictsConcavo-convex hillslope where base level change is long lived rather than impulse

Section 3

Question Answer
Penck 1920Slope replacement Europe
FormUpper part of the concave profile flatterns to produce an upper slope convexity
Base rockIf stable base, steep profile where hard rock and flat if soft
ProcessFall in base level causes the nearby segment to steepen, causing the next segment to steepen = leads to a replacement of a gentle slope with a steeper one
PredictsConvex hillslopes when base level is actively falling as part of a youthful landscape
Process 2Surface of the slope is weathered evenly and crumbles with scree falling to the base, therefore max angle is decreased and replaced by a gentler slope

Section 4

Question Answer
King 1953Pediplanatation South Africa
King 1953Differing dominant mode of hillslope evolution
ProcessBase level fall is episodic
BasisImpulsive uplift and long repsonse but not concavo-convex slope, favoured concave hillslopes and slope replacement
Hard rockqPediments form and persist
AngleMax angle remains constant as do all the slope facets, apart from lower which increases in concavity
Process 2Each upper part retreats by the same amount and maintains the same angle - convexity. The pediment extends in length and becomes slightly gentler in angle
Glichiret and Summerfield 1991Models of eposodic uplift and erosion are incorrect but general idea that there is a link persists