Review of Construction's Impacts on Marine Areas

Abstract

In order to manage flooding, generate electricity, facilitate shipping, support agriculture, and advance industry, dams have greatly benefited human society. The development of dams, however, seems to have a significant impact on neighbouring coastal areas and the natural ecosystems downstream. This review utilises contemporary studies to thoroughly examine how dam construction has impacted river hydrology, geomorphology, and ecology of lower stream reaches globally in order to synthesise these impacts. The consequences of dams on ecosystems include decreased river flow, decreased sediment flux, changing water temperature, altered estuarine delta, altered nutrient composition and distribution, altered phytoplankton population structure and distribution, fragmented habitat, and restricted migration pathways in river segments and nearby oceans. In addition, prohibiting fishing activities, deconstructing pointless dams, and researching innovative reservoir management techniques (such as focused management of reservoir stock and sediment flushing operations) are recommended. Many companies throughout the world engage in marine dredging, which is an extraction process. Although consequences are mainly unknown, there is concern about how dredging may affect marine species, particularly marine sea mammals.  This review seeks to add to the body of knowledge both direct and indirect, adverse and beneficial effects on marine animals. It does so by evaluating the literature that is already accessible. Given the dredgers' modest speed in terms of direct consequences, collisions are possible but rare. Marine mammals' hearing systems are unlikely to be damaged by the noise, which is broadband and has the majority of its energy below 1 kHz, although masking and behavioural alterations are still conceivable