Long shore current essay

Longshore drift

The soft rock easily erodes where as the hard rock is much harder to erode so it stays there and the rock then is called a headland. Result is that the waves bend refract around the headlands Source for Diagram: The Environment Long shore drift is the movement of sand and sediment along a beach in a particular direction due to the movement of swash a turbulent layer of water that washes up on the beach after an incoming wave has broken - Wikipediabackwash carrying the sand in a "saw tooth" motion.

At Muriwai beach the wind direction comes from the SW which means that the L. Saltation Saltation is formally known as the transportation of particles, in our case sand by fluids such as wind or water. During our visit to all the places in Somerset we investigated the coastal processes and management and how this is linked with longshore drift.

Waves are caused by the frictional drag of wind over the water - Waves of oscillation - water particles move in near-circular orbits which decrease in diameter with depth.

If i took measurements from points between Gore Point and Hurlstone, I would have got a more wide range of results which would make my results more accurate.

Any coast lines have the highest facet at the top due to destructive waves forcing the material up to the top. Not only do ports and harbours pose a threat to longshore drift in the short term, they also pose a threat to shoreline evolution.

Red Marl is an example of a soft rock. During the summer season this process is dramatically reduced in its rate at moving sand so it has a more positive impact on the beach then it would in winter.

Abrasion — This is when breaking waves hit the rocks and pebbles against the cliffs, which eventually wears away the land. Somerset is a rural county in the UK. D has a negative effect on the dynamic equilibrium of a beach because of its effects to the sand supply.

Is porlock bay affected by longshore drift?

Porlock Bay is a good summer destination for tourists as it has good industry. A good example of the sediment budget and longshore drift working together in the coastal system is inlet ebb-tidal shoals, which store sand that has been transported by long-shore transport.

Natural features[ edit ] This section consists of features of longshore drift that occur on a coast where long-shore drift occurs uninterrupted by man-made structures. Barriers[ edit ] Barrier systems are attached to the land at both the proximal and distal end and are generally widest at the down-drift end.

Clast Size I measured 30 pebbles in total, picked 1 pebble at every one meters for 30 meters. Picture showing the use of artificial headlands and detached breakwaters in a coastal system Detached breakwaters[ edit ] Detached breakwaters are shore protection structures, created to build up sandy material in order to accommodate drawdown in storm conditions.

We then measured the length of the facet using the 30m tape. This is because it was very dangerous as there was a very strong sea current. Sea arch - A tunnel eroded by the waves through an otherwise resistant rock mass. We picked up 30 pebbles in total. Swash carries the material up the beach at an angle.

This means that sand is moved much quicker, leaving some areas of a beach like Muriwai with significantly smaller amounts of sand. The limitations prevented us to investigate in our study further; we could have got a wide range of results if we investigated further and got accurate result. For example there will be more sand found at the northern point of Muriwai then the southern end of the beach where sand dunes are struggling to form.

Wave erosion in the surf zone is by the process of abrasion, which is most active along headlands where wave energy is concentrated.

Another way to make my investigation more accurate i could have taken measurements from more than just two points at Porlock bay. Clast Shape The last bit of my investigation was to find out if the pebble shape becomes rounder as it goes from the West to East. Coastal landforms Bays and headlands are formed after coastal erosion and they are situated along the coast where there is both hard and soft rock.

The force of the water continues hitting the new cave and the gap widens. Wave refraction around headlands Waves reach shallow water sooner in front of headlands.

Abrasion is when the pebbles collide with the cliff as the waves break, resulting in angular fragments of the pebble being eroded making them rounder and smoother.

During the summer season this process is dramatically reduced in its rate at moving sand so it has a more positive impact on the beach then it would in winter.

The distance at which a wave has travelled is called a fetch. Not only do ports and harbours pose a threat to longshore drift in the short term, they also pose a threat to shoreline evolution.

Wave base - maximum depth to which waves move the water; equals about half of the wave length. Conclusion I conclude that my investigation went successful and i found out there are costal processes occurring at Porlock bay.

The population of minehead is 14 Minehead attracts tourists to the area because it is near to the coast and has lovely beaches.

Longshore drift

We measured the pebbles using systematic sampling. Long Shore current is a very important part in the process of coastal erosion that can also affect people in direct and indirect ways.

According to John Pethick, long shore currents are the "currents that move parallel to the shore"(87).5/5(4). Long shore current is a function of the angle of wave approach. For example, if the waves approach the shoreline from the south, long shore current moves from south to north Although, long shore current and the resulting transport of sediment is only one of the dynamic processes that constantly alter the.

Longshore Currents. The speed at which waves approach the shore depends on sea floor and shoreline features and the depth of the water. As a wave moves toward the beach, different segments of the wave encounter the beach. The longshore current direction at the most seaward gauge 10 reverses direction.

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This recirculation current is the undesirable artifact of the finite length of the basin, and may have influenced the distribution of the current, particularly in the outer surf zone. Long shore drift is the movement of sand and sediment along a beach in a particular direction due to the movement of swash (a turbulent layer of water that washes up on the beach after an incoming wave has broken - Wikipedia), backwash carrying the sand in a "saw tooth" motion.

The pile up of water along the shore causes longshore currents that flow parallel to the beach inside the breaker zone. The water in the longshore current returns seaward as rip currents. The spacing between rip currents is usually .

Long shore current essay
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Essay Sample - Is porlock bay affected by longshore drift? - OzEssay