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Sediment Mobilization Coastal Erosion.

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Sediment Mobilization Coastal Erosion Coastal erosion occurs when sediments from upstream fail to replenish shore sediments. The latter are constantly eroded by wave action and, thus, coast lines undergo dramatic change. Reduction of sediments is primarily due to the construction of structures for hydrological modifications and diversions, in particular dams. The effect of dams on the relative ecology of an area is a subject which has been studied in detail. This is due to the dramatic consequences seen in all rivers once large-scale dams have been constructed. Given below is a detailed account of the effects of dams on aquatic habitats. Dams are constructed for various reasons and very few are built for a single purpose. Agriculture may be viewed as a primary factor, however, as it is responsible for the majority of water abstracted from reservoirs created by dam construction. The effect of damming a waterway is to effectively halt the transport of sediment from upstream of the dam as it settles within the reservoir. This sediment accumulation has a negative effect on the reservoir as over time it dramatically reduces the volume of water that can be stored, thereby reducing the dam's effectiveness. The 'flushing' of sediments from the dam sometimes controls this but can result in a sudden flush of anoxic water and sediments with detrimental results as they smother remaining fertile soils downstream. ...read more.


The increased pressure to support a high quality of life for growing coastal populations raises concerns about long-term adverse impacts on the Michigan coastline. Coastal development managers should recognize several over-arching principles, including: the coastline is truly a finite resource; coastal ecosystems are dynamic and complex; and intensity of coastal development can have a significant impact on the sustainability of the coastal ecosystem. Michigan land use decisions are made at the local level where there is little understanding of the complexity of the entire coastline. Michigan Sea Grant has the ability to provide information across jurisdictional boundaries and create partnerships and collaborations to assist coastal communities in creating sustainable development plans. Goal Statement Contribute to the overall understanding of the impact of coastal development and provide information and technical assistance to promote and facilitate sustainable coastal communities. Outreach Objectives 1. Facilitate sustainable coastal community forums in both urban and rural settings, involving a broad diversity of local government officials, and private sector and citizen stakeholders to develop successful sustainable community development models. 2. Continue to lead and support on-going efforts to improve the quality of the Detroit River and other community waterfronts, including brownfield redevelopment. 3. Educate property owners, public and private developers, financial institutions, and insurance agencies on environmentally appropriate coastal erosion control techniques. ...read more.


The wetlands, primarily the mangrove forests, are important for firewood and charcoal, as habitats for aquatic life and food and for prawn, and for protection from erosion. More than half the nation's annual fishery income is related to the mangroves, and the livelihoods of 300,000 fishermen depend on them. Sea level rise is not yet perceived as a direct threat, but "it is highly probable that the mangrove buffer may vanish altogether," say the authors, "exposing the previously protected coastal development to direct wave attack." Wetlands are considered wastelands by developers. Clearance and conversion to agriculture or aquaculture, industrialization, urbanization, and pollution all menace the mangrove forests. Of the various threats to the coasts - and some may together affect the same area - tidal submergence is likely to come first, then wetland loss, and finally coastal erosion. Flooding is a nuisance unless it is prolonged. Areas can easily be protected from inundation. Wetland loss, while small in terms of area, would have serious economic repercussions, and reclamation could cause the mangrove firests of Peninsular Malaysia to disappear by the year 2000. Among possible responses, the authors feel a wait-and-see attitude is untenable given the "overwhelming scientific evidence that points to a rise in sea level and the potentially large costs of inaction." Given "the long lead time required to transform a policy into reality," they continue, "makes it prudent to begin" to incorporate adaptation measures into development and land use planning. ...read more.

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