As the thermocline moves up and down a sloping lake bed, it creates a 'swash zone' on the lake bed where temperatures can rapidly vary, potentially influencing fish habitat usage. As the thermocline rises up a sloping lake bed, it can also cause enhance benthic turbulence by convective overturning, whereas the falling thermocline experiences greater stratification and low turbulence at the lake bed. Internal waves can also degenerate into non-linear internal waves on sloping lake-beds. When such non-linear waves break on the lake bed, they can be an important source of turbulence and have the potential for sediment resuspension