def erosion
transport of soil particles along the soil surface dependin on tranport medium either fluvial erosion or aeolian erosion
fluvial erosion
rainfall and surface runoff rivers and streams floods
aeolian erosion
geomorphical force in arid and semi arid regions deflation abrasion
erosion by human activities
intensive agricultre deforestation roads and urbanization
which flow energy
vertical erosion and lateral erosion resistance of the materia is crucial factor variation of different particles
Hjulström curve
shows a rivers speed- affects to erode particles of different sizes 1. critical erosion speed - > minimum speed to transport and erode particles 2. mean setting velocity -> minimum speed needed to deposit particles
badland formation
arid regions source of sediment for dryland rivers gullysystems by wind and water erosion gullly landscape with high drainage desities are called badlands manifestation of desertificaion
badland characteristica
loess smectite-rich and mudstones vulcanic ash sandy conglomerates with clay and weakly cmented sandstones
badland characterisitis important
dry terrain soft sediment rocks and clay rich soils eroded by wind and water minimal vegetation and steep slopes - steile abhänge lack of regolith layer -> covering solid rocks canyons and ullied are common in badlands
how to prevent erosion
crop rotation vegetation terracing and windbeaks rows of trees and shrubs
