Koehn Daniel Research

		Research
		Daniel Koehn



HOME
	Roughening of stylolites
	In this project we model the development of stylolites. An initially flat surface roughens in the models. We compare the characterisitcs of the numerical stylolites with the data from natural stylolites. Part of the project is funded by the DFG. Cooperation with the University of Strasbourg and the University of Grenoble.
	Dissolution grooves
	We examine dissolution grooves on stressed crystal surfaces in experiments and numerical simulations. These grooves develop on crystal faces that are oriented parallel to the main compressive stress. Cooperation with the University of Oslo. read more >
	Structures of confined grain boundaries
	We examine the structure of confined grain boundaries in numerical simulations. The grain boundary is stressed so that material disolves and precipitates and the boundary changes its shape. Island channel structures develop and coarsen. Cooperation with the University of Oslo.
	Fracturing
	We examine the development of fractures in rocks and study the influence of the deformation history on the development of fractures. In particular we want to know how fracture influence the stress field and the growth of secondary fracture sets.
	Fracture boudinage
	In this work we study the development of fractures and veins in sedimentary layers. We study the initiation of fracture spacing and the developing stress fields.
	Rift development
	We are part of a DFG Forschergruppe that studies the extreme uplift of rift flanks and blocks within rifts and possible links with climate changes in aquatorial Africa.
	Fringe and vein growth
	Numerical simulations of fibre growth in veins and strain fringes. In this work we show how tracking and non-tracking fibres develop in complex strain fringes and veins. We also study the interactions of rotating core-objects and fringes in analoge models. read more > Program Fringe Growth >