What Problems are Caused by Dredging Out Wetlands?

Wetlands play a crucial role in maintaining ecological balance and supporting biodiversity. However, human activities such as dredging out wetlands to build structures like seawalls, canals, and shoreline stabilization structures have severe consequences on the environment. These structures are often built to redirect rivers and streams, protect buildings from erosion, or alter the effects of ocean waves and currents.

One of the primary issues caused by dredging out wetlands is the destruction of natural habitats for plants and animals. Shoreline structures can make it difficult for plants to photosynthesize, and changes in water flow can affect the ability of birds to fly and amphibians to breathe. Additionally, oils and chemicals from nearby sources like residential areas and industrial facilities can smother aquatic plants and animals.

Fertilizers used in ornamental gardens and lawns can also have a significant impact on the environment. When these fertilizers enter stormwater runoff, they can increase phosphorous levels in the water, leading to algal blooms. This can change the pH of the water, making it difficult for some aquatic species to survive.

Furthermore, dredging out wetlands can trap sand being carried inland by waves, exacerbating erosion problems elsewhere. For example, Towra Beach is eroding rapidly, and artificial sea walls are preventing sand from replenishing this area. This not only harms the beach but also reduces the natural sediment supply, which can have long-term consequences for coastal ecosystems.

In addition to these environmental issues, residential areas can reduce the available space for natural vegetation, alter natural water flow patterns, and increase local population pressure. This can lead to the spread of invasive weeds from ornamental gardens into native ecosystems, further threatening biodiversity.

The construction of seawalls and other shoreline stabilization structures during the 1960s and 1970s has had a lasting impact on our nation's beaches. While these structures may have provided temporary solutions to beach erosion problems, they have also had devastating consequences for the environment. As we move forward, it is essential that we consider the long-term effects of dredging out wetlands and work towards more sustainable solutions that prioritize environmental protection.

What problems are caused by dredging out wetlands