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The regulation may consist of jetties, possibly combined with maintenance dredging programmes. If the tidal inlets and the river mouths are located on littoral drift shorelines, they are often in a natural equilibrium with respect to bypassing of the littoral drift, which normally occurs on a shallow bar across the inlet. If the inlet/mouth is upgraded to accommodate navigation, this bar is normally cut off by the jetties or dredged. Examples of coastline response to different types of groyne schemes are presented in The best hope you like dogs doormatthe article on groynes as shore protection. Effects of groynes and different types of groynes are also presented in Groynes. Trapping of sand in entrance channels and outer harbours. Sand is often deposited in deep water after being removed by dredging. Trapping of sand at the upstream side of the structure that reduces sand supply to the adjacent shores. This causes mostly erosion at the lee side, but large structures may also cause erosion on the upstream side. Compression occurs in rocky areas when air enters into crack in rock. This air is trapped in cracks by the rising tide, as waves crash against the rock the air inside the crack is rapidly compressed and decompressed causing cracks to spread and pieces of rock to break off.