Rill Initiation

Thor-Bjørn Ottosen

Studenteropgave: Semesterprojekt

Abstrakt

This project is about rill erosion. The aim is to test whether rill initiation can be predicted from the shear strength of the soil as measured with a torvane on saturated soil. This approach was set forward by Rauws and Govers 1988. Rainfall simulation experiments are conducted at a plot size 2x1m, performed in May on the Marbjerg experimental field. The results are evaluated using a chain set to measure alterations of the surface roughness as a result of the erosion, visual evaluation of photographs of the soil surface to evaluate the topographic changes in the soil as a result of the erosion is performed, and the velocity is measured with plastic glitter used as a tracer. No erosion is observed due to a large hydraulic conductivity in the soil, however, it is calculated that it is plausible that rills can occur at the Marbjerg field under the right circumstance, and that it is plausible that the Rauws and Govers model could be used to predict the initiation.

UddannelserBasis - International Naturvidenskabelig Bacheloruddannelse, (Bachelor uddannelse) Basis
SprogEngelsk
Udgivelsesdato25 jun. 2008