Answer to Question 1
Land use in the drainage basin of a stream that delivers sediment to the coast will affect the shoreline sediment budget. Agriculture, mining, timber harvesting, or urbanization typically increase sediment loads to streams so that there are potential gains in the shoreline sediment budget. This effect is counteracted, however, where dams trap sediment in reservoirs and decrease the shoreline sediment budget compared to natural conditions. Increases in sediment budget tend to cause enlargement of beaches whereas decreases cause loss of beaches by wave and current erosion.
Answer to Question 2
Groins are walls built perpendicular to the shoreline to trap sediment being moved by longshore current, which widens the beach on the up-current of the groin. Sediment supply down-current of the groin is reduced, so erosion in this area is accelerated. Jetties function in the same way, but stabilize the location of an inlet. Beaches up-current of a jetty accumulate sediment whereas those down-current of the jetty are sediment-starved and subject to wave and current erosion.
What Fuels Our Activities?
The apples of today are larger and sweeter than their ancestors, thanks to hundreds of years
A karyogram of the human chromosome set, showing the distinctive banding pattern of each chromosome.
Major muscles of the human musculoskeletal system
Main components of the human endocrine system and the effects of their secretions
Cladogram showing genetic distances and relationships between human populations