What shape does a sand lens in aquifers typically have?

A sand lens in aquifers typically has a convex shape due to the way sedimentary processes and water movement interact within the aquifer system. As water flows through porous materials, finer sediments like silt and clay tend to be carried away, leaving behind coarser materials such as sand. This process can lead to the formation of lenses of sand that are often rounded or elevated, similar to a hillock or mound within the surrounding material.

The convex shape allows for effective water storage and flow within the aquifer, as it enhances the capacity of the surrounding water to move through the coarser sand. This shape is crucial for understanding the hydrology of aquifers, as it influences both the distribution of groundwater and the availability of water resources for extraction and use. The configuration can also impact local ecosystems and water quality, making it an essential consideration in environmental health and management.