Permeabilitetströppen

Permeabilitetströppen is a geological term referring to a specific type of soil or rock layer that significantly impedes the flow of water. This layer, often referred to as an aquitard or aquiclude, has a very low hydraulic conductivity. While it is not entirely impermeable, its ability to transmit water is so restricted that it effectively acts as a barrier to significant groundwater movement.

These layers are typically composed of fine-grained sediments such as clay or silt, or of unfractured, dense rock formations. The small pore sizes and tight packing of particles in these materials create a tortuous path for water to travel, drastically slowing down its percolation. The presence of a permeabilitetströppen is crucial in hydrogeology as it can influence groundwater flow patterns, create perched water tables, and separate different aquifers.

Understanding the extent and properties of a permeabilitetströppen is vital for various applications, including groundwater resource management, the design of underground structures, and the assessment of contaminant transport. Its identification and characterization are often achieved through field investigations, laboratory testing of soil and rock samples, and geophysical surveys. The concept helps differentiate between permeable zones that can store and transmit significant amounts of groundwater and less permeable zones that act as confining layers.