what is one of the dangers of replacing eroded beach sand with dredged sand from offshore

Areas of saline intrusion will increase, particularly in low lying coastal areas (6). The flora and fauna associated with these will also be affected. Natural assets in the coastal zone may be lost, such as wetlands, mudflats, salt marshes, beaches and sand dunes. These problems are likely to be particularly acute in the region due to the fact that the landmass is subsiding. The unpredictable coastal dynamics may lead to erosion of some beaches. Flooding caused by storm surges and sea level rise may damage coastal rail lines and roads. Increased wave heights and potential storminess may lead to damage to coastal amenities including piers, promenades, beach cafes etc. Protecting coastal assets (or relocating them) may be costly if the effects of climate change are sudden rather than gradual. Rising sea levels and potential increased storminess will increase rates of coastal erosion. However, in the context of broader coastal zone management issues and also the viability of coastal settlements on eroding coastlines, coastal erosion merits serious attention.

Even taking the extreme property number estimates, for which asset values vary between £2.7 and £12.2 billion, this still only represents 2–6% of the total capital value of assets at risk (5).

Coastal erosion losses represent only just over 3% of the total risk, although this is based upon an average estimation of property numbers (value £7.7 billion at 2000 prices). However, on its own, coastal erosion is not a major economic issue. Length with artificial beaches and defence works (%) Islands with a surface area < 1km2 and inland shores where the mouth is less than 1 km wide are not included (10). Coastal erosion and protection in the UK. In Scotland erosion is less severe than elsewhere due to isostatic uplift and its extensive areas of hard geology (2). Some 28% of the coast in England and Wales experiences erosion at rates higher than 0.1 m/year (1).

Annual damages due to coastal erosion are expected to increase by 3-9 times, costing up to £126 million per year by the 2080s (4). The UK vulnerability is indicated by the fact that it has around 2300 km of artificially protected coast, the longest in Europe. The UK has many eroding coastlines (see Table below), the total length of which has recently been estimated to be over 3000 km (3). Coastal erosion United Kingdom Vulnerabilities

What is one of the dangers of replacing eroded beach sand with dredged sand from offshore