Recreation : Land-based recreation : Erosion

Erosion from land-based recreation

The causes of erosion

The causes of feature erosion

Shrinking beaches

As with soil compaction, erosion of a feature is also caused by exertion of pressure. However, the greatest erosional forces exerted on a feature come from natural sources such as rain, wind and, in the intertidal area, wave action. At a site level, these forms of erosion will be much more significant than that caused by recreation. However, as recreational activities tend to be concentrated along specific access routes or in small areas, their impact can be magnified, causing significant erosional patches within a site or feature. Such erosion is particularly evident in coastal areas frequented by walkers and in the vicinity of heavily used access points.

The rate of erosion is not simply dependent upon the intensity of activities in the vicinity of a feature. It is also related to the erodibility of the soil, which in turn is linked to its texture, its capacity to absorb and filter water and its organic and chemical content. Figure 6.1 illustrates this relationship.

The causes of erosion

NATURAL PROCESSES                                                 RECREATIONAL ACTIVITIES

1.    Wind                                                                         1. Types of activity

2.    Rain                                                                          2. Location of activity

3.    Waves                                                                       3. Level of activity

                                                                 

                              NATURAL IMMUNITY OF FEATURE

                                1. Texture

                                2. Infiltration capacity

                                3. Chemical/biological content

                                                 

                                EROSION OF FEATURE

 

UK CEED (1998)

Soft coastal habitats tend to face the greatest risk of erosion from both natural processes and also human activities, including recreation. Recreation may have a particular erosional impact on sand dunes and sand flats. Table 6.2 summarises the main causes of erosion on marine features.

Causes of Feature Erosion

Feature

Soil Type

Erosional Impact of Recreation

Main Causes of Erosion

(descending order of magnitude)

Sand dune

Sands

  • Wind action
  • Recreation - access routes to beaches
  • Off-road vehicles and horse riding

Mudflat

Silt/mud

  • Wave action
  • Recreation - accessing water at low tide

Sand flats

Sands

  • Wind and wave action and runoff
  • Recreation - motorised vehicles can destabilise upper surface level and make it more vulnerable to natural erosion

Sandbanks

Sand covered by sea water

r

  • Wave and storm action

Rocky shores

Rocks and gravel

r

  • Insignificant erosion

Sea caves

Rock

r

  • Wind and wave action

UK CEED (1998)

Key

Significant recreational impact Small recreational impact

r Little or no recreational impact

Shrinking Beaches

Many of the UKs shorelines, consisting of soft rock expanses, mud and sand flats, are undergoing a process of retreat, whereby the sea is eroding the intertidal features in front of static sea defences. Such shrinking is largely a result of a number of natural processes, including wave and wind actions and sea level rise. However, these processes can be accentuated by erosional pressures caused by recreational activities.

The decrease in the width of sandy beaches, which is common throughout Europe, can have a serious effect upon the ability of the habitat to support indigenous species. It can also have a significant impact upon its amenity value for tourism and recreation. It can also have the knock-on effect of putting greater recreational pressure on other similar sites. The impact on tourist incomes could have important indirect effects on the environment as less money may be available for management and nature conservation purposes.

 

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