Coastal Deposition

Coastal deposition

Coastal deposition forms part of the coastal processes by delivering the collected material at a specific point. The process of collection and depositing at another space presents a complex system. Different facets influence the manner coastal deposition happens. These aspects include the manner waves fight against gravity and the use of friction to transport material. Some material already occurs in a suspended version while others transpire on the ocean floor.

These different processes play a key role to ensure the movement of materials from the ocean bottom to other spaces in time. A deposition allows for the development and build-up of our beach areas. Coastal deposition one notices when noticing different materials stretching alongside the beach areas. Sometimes one notices a new collection of material that looks different from the surrounding environment. Many times the collection comes from areas deep down at the ocean bottom.

Weather conditions play a key part to drive the energy forces and impacts on the wave’s ability to transport and deposit. Before we discuss types of coastal deposition, we first need to gain an understanding of the meaning thereof. These processes present detailed scientific and mathematical explanations. Let us see first the physical and chemical processes that influence the occurrence of coastal deposition.

What is a Coastal Deposition?

Deposition presents a complex process that involves the transportation and placement of collected material at another space in time. Two key aspects to remember relate to the scale and the location the material becomes deposited. The main drivers, in this case, applies to the drifts alongside the beach areas and the swash. A swash aligned beach phenomenon normally happens when the waves become more parallel to the shore. It, therefore, dumps material at the beaches and form part of the build-up processes.

A swash aligned with the shorelines experiences extensive inputs from the wave strengths. The drift aligned coastal zones create waves at a different angle. This angle the waves transport material down the shoreline and keep the beaches narrow. Drift aligned shoreline areas normally associate with obstructions or discharged materials. Swash beaches happen at large beach areas evident of dunes, barriers and drainage sites.

Coastal deposition adds sediment and other materials to the coastal zone areas. Different aspects influence the occurrences of deposition, for example, the frequency of material supply to the shoreline, the geological shapes, the rate of transportation by the ocean and waves, sea-level changes and the speed these events happen. 

Various other aspects play a key role in this process, for example, climate change, strong weather, tsunamis, storm surges, and geological shapes or processes. The spatial and outlook differences between the diverse spaces influence the manner the sea operates. These processes significantly impact the biodiversity situated alongside the beach areas.

Coastal Deposition and its Processes

Deposition offers diverse geological processes where soil, rocks, sand, and other sediments become added to an existing landscape. Waves consist of energy that lifts and deposits the material in another space. Deposition happens when the different forces for example water and wind struggle to oppress the impacts of gravity on their movements. It, therefore, creates friction and subsequent transportation that leads to deposition. Deposition occurs when water and wind cannot hold the different materials in the fluid. It creates a moving action and subsequent build-up of sediment.

The deposition also happens with the build-up of existing sediment or particles created by different natural processes. For example, the plankton deposition happened because of diverse physical and chemical occurrences in the ocean. 

The understanding of a null-point hypothesis plays a key role in this instance. It focuses on the deposition of material right through the ocean layers according to the particle size. Hydraulic influence plays a significant role in this process and results in a seaward progression. This happens when the water forces equal gravity for each particle size. The explanation of this relates to the movement of a specific particle size across the layer to a balanced position with the wave. It just flows accordingly.

The different processes summarise the down-slope gravitation profile and levels because of flow unevenness. Zero net transport become known as the null point. The effects of gravity on the system determine the levels of deposition, especially for the smaller particles. The friction evident during deposition tend to impact on the larger materials. 

The interaction between the unequal boundaries describes the collaboration between the wave flows as well as the ripple formations. In the event of strong onshore waves, the current remains trapped in the stream shadow. In the event a balance occurs between the different interactions, the process becomes neutral. Sediment and materials develop on both sides of the current. It creates a brown-looking water space and travels with the tide.

What are the Coastal Deposition types that happen?

Large particles transported from the ocean floor or because of suspension come to rest during the occurrence of insufficient stress and water activity to keep the sediment moving. The deposition can take time because it needs to drop down from the top of the water resources. 

Coastal deposition typically happens during the concentration and collection of sediments during a wave activity. Two different shapes of deposition happen referred to as a subsequent or an initial outline.

The depositions combine the activities with key aspects related to the creation of tombolos, foreland, bars or beaches. The depositions happen during the build-up of ridges by the waves. Wind impacts on the abilities of the waves to perform different actions. These different forms comprise shell, gravel or sand particles. The interconnection between the different groups plays a key role in the process.

Frequently Asked Questions

What do we mean by Coastal Deposition? 

Coastal deposition presents the deposit of collected material at another space in time. This happens because of the waves collecting material from different coastal zone areas and depositing them in another area.

What are the key factors related to Coastal Deposition? 

Coastal deposition comprises specific key factors, namely the ability of the water to work against gravity and subsequently drop the material at a certain point. Gravity plays a key role to allow for collected material to drop at certain areas alongside the beaches or the ocean floor.

Which areas normally form part of deposition? 

Heavy material becomes deposited in different areas. These spaces evident of deposition includes the beaches, shorelines, dunes, barriers, hills or the ocean floor.

What types of external factors influence deposition levels? 

Wind impacts the deposition levels considerably. Wind impacts on the waves’ ability to collect material from different areas and move to other spaces for deposition.

Why do we sometimes see brown layers developing? 

During some instances the collected material balances with the suspension of the wave layers. The suspension becomes neutral. The particles do not drop and become deposited. Instead, they float and create this brown color we sometimes notice at the shoreline areas.

What is the frequency of Coastal Deposition? 

Coastal deposition offers a continuous process presents different time periods. For example, some materials need extensive time to work through the different sea layers and drop to the bottom. Other heavier material may present a quicker plunge time. Weather intensity also influences the wave forces and ability to deposit sediment at different spaces alongside the shoreline. 

References 

  1. https://sk.sagepub.com/reference/geography/n185.xml  
  2. Araya-Vergara J.F. (1982) Marine-deposition coasts. In: Beaches and Coastal Geology. Encyclopedia of Earth Science. Springer, Boston, MA
  3.    Wright, L. D., & Thom, B. G. (1977). Coastal depositional landforms: a morphodynamic approach. Progress in Physical Geography: Earth and Environment, 1(3), 412–459. https://doi.org/10.1177/030913337700100302
  4. https://www.nps.gov/articles/coastal-processes-sediment-transport-and-deposition.htm