Modelling on the influence of obstacle height relative to flow height upon the geometry of turbidity current deposits
Al-Ja'aidi, Omar S.
published: Mar 24, 2006
ArtNo. ESP155023902001, Price: 29.00 €
In flume experiments, turbidity currents were released via a lock exchange mechanism and then allowed to interact with obstacles, which modelled diapirs. The range of depositional possibilities around diapirs proved to be controlled by the ratio between the obstacle height and the flow height. Where the dimensionless obstacle height (obstacle height/flow height) is less than 0.1, the deposit of flows resembles the deposit geometries of unobstructed flows. However, where H* 0.1) result in thicker sediment accumulation upstream of the obstacle and reduced sedimentation immediately in the obstacle lee. This reflects the fact that the flow has been deflected elsewhere. Studies of the distribution of turbidites around salt diapirs in the subsurface have shown the occurrence of sediment accumulations at specific sites comparable to those found in the experiments. In the subsurface, if H* can be quantified from the observed sediment distribution patterns around diapirs from 3D seismic images, it may be possible to add value to the existing depositional geometries around topography (e.g. diapirs) and possibly enhance predictions on the extent and nature of depositional geometries in areas where seismic quality is poor.