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in Poole Harbour the main longshore drift direction is SW-NE driven round Studland Bay by the prevailing wind, producing a spit from the south. The process of longshore drift occurs. Longshore drift continues to deposit material across the mouth of a river which results in the formation of a long bank of sand and shingle. Wave-average area morphologic change numerical modelling system, CST3D, is adopted to reproduce tombolo and salient evolution behind a detached breakwater at a laboratory. Spits are usually formed when re-entrance takes place by the longshore drift process from longshore currents. When rising sea levels cause constructive waves to drive a ridge of sediment onshore to coastlines with a gently sloping shallow sea bed. wave fronts approach it aligned parallel to the coast, swash aligned beaches often exhibit well-defined berms, aligned at an angle to the prevailing wind direction, wave fronts approach the coast at an angle, meaning there is transport by longshore drift, may exhibit some sorting of sediment, with smaller, more rounded sediment at the furthest end, this is because smaller particles are transported by even low energy waves and are carried greater distances up the beach by each swash, more frequent movement leads to greater rounding by attrition. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. From the islands northernmost point Cape Farewell, situated at the northern end of the South Island of New Zealand, it moves eastwards. It is the longest sand spit located in New Zealand, stretching for about 26 km above sea level and 6 km more underwater. 5B Depositional Landforms - A-LEVEL GEOGRAPHY REVISION: EDEXCEL block a channel and collect sediment, which over time, leads to the formation of an isthmus. what is a spit? Ninian's Ayre (Tombolo) in Shetland, Scotland - JSTOR Pebbles on the beach are graded, with the coarser stones nearer to Portland. The Jurassic Coast of Dorset and East Devon is a 95 mile stretch of coastline that demonstrates 185 million years of geological history.